Theoretical study on organic dyes with tunable π-spacers for dye-sensitized solar cells: Inspired by the organic polymer photovoltaics
作者：
Xie, Xiaoyin;Liu, Zhihai;Li, Wei;Bai, Fu-Quan* ;Lee, Eun-Cheol* ;...
期刊：
Chemical Physics Letters ,2019年719:39-44 ISSN：0009-2614
通讯作者：
Bai, Fu-Quan;Zhang, Hong-Xing;Lee, Eun-Cheol
作者机构：
[Bai, Fu-Quan; Zhang, Hong-Xing; Xie, Xiaoyin; Zhang, HX] Jilin Univ, Inst Theoret Chem, Int Joint Res Lab Nanomicro Architecture Chem, Changchun 130023, Jilin, Peoples R China.;[Xie, Xiaoyin] Jilin Inst Chem Technol, Dept Chem Technol, Jilin 132022, Jilin, Peoples R China.;[Liu, Zhihai] Yantai Univ, Sch Optoelect Informat Sci & Technol, Yantai 264005, Shandong, Peoples R China.;[Li, Wei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Lee, Eun-Cheol] Gachon Univ, Dept Nanophys, Gyeonggi 13120, South Korea.
通讯机构：
[Bai, FQ; Zhang, HX] J;[Lee, Eun-Cheol] G;Jilin Univ, Inst Theoret Chem, Int Joint Res Lab Nanomicro Architecture Chem, Changchun 130023, Jilin, Peoples R China.;Gachon Univ, Dept Nanophys, Gyeonggi 13120, South Korea.
关键词：
Dye-sensitized solar cells;Organic dyes;Polymer photovoltaics;Theoretical investigation;π-spacer
摘要：
We present the theoretical investigation on tuning π-spacers in D-π-A organic dyes for dye-sensitized solar cells (DSSCs). The validity of three series of conjugate units (12 types) conventionally used in polymer photovoltaics are utilized as the π-spacers of organic dyes. Our results indicate that the extension of π conjugation can efficiently improve the absorption intensity. The absorption spectra red-shifts is because the increased π-spacers significantly destabilize the highest occupied molecular orbital level, whereas the lowest unoccupied molecular orbital level has negligible changed. Our simulation is expected to assist the design high performance dyes for dye-sensitized solar cells applications. © 2019 Elsevier B.V.
语种：
英文
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Few-layer phosphorene: An emerging electrode material for electrochemical energy storage
作者：
Tao, Yaping;Huang, Ting;Ding, Chunxia* ;Yu, Feng;Tan, Deming;...
期刊：
Applied Materials Today ,2019年15:18-33 ISSN：2352-9407
通讯作者：
Ding, Chunxia;Xie, Qingji
作者机构：
[Tao, Yaping] Luoyang Normal Univ, Key Lab Electromagnet Transformat & Detect Henan, Coll Phys & Elect Informat, Luoyang 471022, Peoples R China.;[Ding, Chunxia] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xie, Qingji; Huang, Ting; Yao, Shouzhuo] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;[Yu, Feng] Queensland Univ Technol, Sci & Engn Fac, Sch Chem Phys & Mech Engn, Brisbane, Qld 4001, Australia.;[Tan, Deming; Wan, Faxing] Tech Univ Dresden, Dept Chem & Food Chem, D-01062 Dresden, Germany.
通讯机构：
[Ding, Chunxia; Xie, Qingji] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.
关键词：
Electrode material;Few-layer phosphorene;High-performance;Rechargeable battery;Supercapacitor
摘要：
The emergence of phosphorene in 2014 augments the family of two-dimensional (2D) materials, which soon triggered tremendous interest in the field of physics, chemistry, biomedicine, and materials science. Considering the tunable band gap, large interlayer spacing (0.53 nm), high charge carrier mobility and strong in-plane anisotropy, tremendous research efforts have been dedicated to the exploration of phosphorene's applications in electrochemical energy storage systems. This review, both theoretically and experimentally, introduces the state-of-the-art development of few-layer phosphorene as the electrode material for electrochemical energy storage systems. The discussed electrochemical energy storage systems involve Li-ion batteries, Na-ion batteries, K-ion batteries, Li-S batteries and supercapacitors. More importantly, perspectives on future possibilities and opportunities of electrochemical energy storage devices based on few-layer phosphorene are also suggested, including dual-ion batteries and metal-ion hybrid capacitors. Finally, the key challenges of phosphorene electrodes are provided for the further research in this thriving field. © 2018 Elsevier Ltd
语种：
英文
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Viscoelastic and Nonflammable Interface Design–Enabled Dendrite-Free and Safe Solid Lithium Metal Batteries
作者：
Ma, Qiang;Zeng, Xian-Xiang;Yue, Junpei;Yin, Ya-Xia;Zuo, Tong-Tong;...
期刊：
Advanced Energy Materials ,2019年9(13):1803854- ISSN：1614-6832
通讯作者：
Wu, Xiong-Wei
作者机构：
[Ma, Qiang; Wu, Xiong-Wei; Deng, Qi; Zeng, Xian-Xiang] Hunan Agr Univ, Coll Agron, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Ma, Qiang; Zuo, Tong-Tong; Wu, Xiong-Wei; Yue, Junpei; Yin, Ya-Xia; Liang, Jia-Yan] Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China.;[Wu, Xiong-Wei; Deng, Qi] Hunan Prov Yin Feng New Energy Co LTD, Changsha 410000, Hunan, Peoples R China.
通讯机构：
[Wu, Xiong-Wei] H;[Wu, Xiong-Wei] C;Hunan Agr Univ, Coll Agron, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China.;Hunan Prov Yin Feng New Energy Co LTD, Changsha 410000, Hunan, Peoples R China.
关键词：
composite polymer electrolytes;dendrite-free;lithium metal batteries;viscoelastic and nonflammable interfaces
摘要：
Herein, a composite polymer electrolyte with a viscoelastic and nonflammable interface is designed to handle the contact issue and preclude Li dendrite formation. The composite polymer electrolyte (cellulose acetate/polyethylene glycol/Li 1.4 Al 0.4 Ti 1.6 P 3 O 12 ) exhibits a wide electrochemical window of 5 V (vs Li + /Li), a high Li + transference number of 0.61, and an excellent ionic conductivity of above 10 −4 S cm −1 at 60 °C. In particular, the intimate contact, low interfacial impedance, and fast ion-transport process between the electrodes and solid electrolytes can be simultaneously achieved by the viscoelastic and nonflammable layer. Benefiting from this novel design, solid lithium metal batteries with either LiFePO 4 or LiCoO 2 as cathode exhibit superior cyclability and rate capability, such as a discharge capacity of 157 mA h g −1 after 100 cycles at C/2 and 97 mA h g −1 at 5C for LiFePO 4 cathode. Moreover, the smooth and uniform Li surface after long-term cycling confirms the successful suppression of dendrite formation. The viscoelastic and nonflammable interface modification of solid electrolytes provides a promising and general strategy to handle the interfacial issues and improves the operative safety of solid lithium metal batteries. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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Enhanced cycling performance and rate capacity of SiO anode material by compositing with monoclinic TiO2 (B)
作者：
Zhou, Nan;Wu, Yufan;Zhou, Qing;Li, Yiran;Liu, Shihan;...
期刊：
Applied Surface Science ,2019年486:292-302 ISSN：0169-4332
通讯作者：
Zhou, Zhi;Xia, Mao
作者机构：
[Wu, Yufan; Xia, Mao; Zhou, Qing; Zhou, Nan; Zhou, Zhi; Liu, Shihan; Li, Yiran] Hunan Agr Univ, Coll Sci, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;[Wu, Yufan; Xia, Mao; Zhou, Qing; Zhou, Nan; Zhou, Zhi; Liu, Shihan; Li, Yiran] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao; Zhang, Hongbo] Cent S Univ, State Key Lab Power Met, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Zhou, Zhi] H;[Xia, Mao] C;Hunan Agr Univ, Coll Sci, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;Cent S Univ, State Key Lab Power Met, Changsha 410083, Hunan, Peoples R China.
关键词：
Hydrothermal method;Li-ion diffusion coefficient;Lithium-ion batteries;SiO;TiO2 (B)
摘要：
Silicon monoxide (SiO) is regarded as a great potential anode material for high-energy lithium-ion batteries (LIBs) owing to the high theoretical specific capacity (2650 mAh g−1), low voltage platform, eco-friendly and rich reserves. However, the particle pulverization, induced by large volume change during (de)lithiation, can result in the capacity degrading significantly. As we all know, it is a good strategy that using TiO2 to modify the SiO-based anode. TiO2 can serve as rigid outer layer to keep the structural integrity. In addition, the electrochemical performances of monoclinic TiO2 (B) are better than anatase and rutile TiO2. Therefore, compositing with TiO2 (B) is an admissible method to enhance the electrochemical properties of SiO-based materials. And the pretreated-SiO/TiO2 (B) composites (abbreviated as p-STB) are prepared by hydrothermal treatment at 180 °C for 12 h and then calcined at 325 °C for 2 h. In this paper, p-STB-1 and p-STB-2 are prepared that the weight ratios p-SiO and TiO2 (B) are 4:1 and 3:1, respectively. The structure and components of composites are also performed on X-ray diffraction (XRD), Fourier transform infrared reflectance (FT-IR) spectroscopy, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). For p-STB, TiO2 (B) is mainly covered on the surface of pretreated SiO (p-SiO). The Li-ion diffusion coefficients of as-prepared materials are calculated by cyclic voltammetry and electrochemical impedance spectroscopy. The electrochemical test results suggest that the p-STB-1 has batter cycling performance (730 mAh g−1 after 100th cycle) and admirable rate capacity (450 mAh g−1 under 3.2 A g−1). The modified method, which was compositing with TiO2 (B), is beneficial to the commercialization of SiO-based materials. © 2019 Elsevier B.V.
语种：
英文
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Scalable synthesis SiO@C anode by fluidization thermal chemical vapor deposition in fluidized bed reactor for high-energy lithium-ion battery
作者：
Xia, Mao;Zhou, Zhi;Su, Yifeng;Li, Yiran;Wu, Yufan;...
期刊：
Applied Surface Science ,2019年467-468:298-308 ISSN：0169-4332
通讯作者：
Zhang, Hongbo;Xiong, Xiang
作者机构：
[Xia, Mao; Xiong, Xiang; Zhang, Hongbo] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.;[Wu, Yufan; Su, Yifeng; Zhou, Zhi; Zhou, Nan; Li, Yiran] Hunan Agr Univ, Coll Sci, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhang, HB; Xiong, X] C;Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
关键词：
Dispersibility;Fluidization thermal chemical vapor deposition;Lithium ion batteries;Silicon monoxide
摘要：
The traditional preparation method of silicon monoxide (SiO) electrode is suffer from easy to agglomerate, rigour synthesis conditions and high cost, which seriously impede its application in power battery. In order to restrain aggregation or cake of powder particles during heating reaction and improve the dispersion performance of SiO powders, we adopt a novel fluidization thermal chemical vapor deposition (FTCVD) synthesis strategy. The strategy of this study is carried out in a kilogram-scale fluidization bed reactor. This approach is simple, manageable, inexpensive and scalable-productive, which can use for a large-scale production and commercial application. Here, the [email protected] composite through low cost micron-scale SiO powders as raw material no further grinding. The [email protected] anode material shows a high capacity of 501 mAh g −1 after 300 cycles at a current density of 1.2 A g −1 , and an initial coulomb efficiency of 82% and high capacity retention of 93.3%. The new method can be applied to a large-scale production and commercial application. © 2018 Elsevier B.V.
语种：
英文
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Plasma milling modified Sb2S3-graphite nanocomposite as a highly reversible alloying-conversion anode material for lithium storage
作者：
Liu, Yuxuan;Lu, Zhongchen* ;Cui, Jie;Liu, Hui;Liu, Jun;...
期刊：
Electrochimica Acta ,2019年310:26-37 ISSN：0013-4686
通讯作者：
Hu, Renzong;Lu, Zhongchen
作者机构：
[Hu, Renzong; Zhu, Min; Liu, Yuxuan; Liu, Jun] South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.;[Lu, Zhongchen] South China Univ Technol, Sch Mech & Automot Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.;[Cui, Jie] South China Univ Technol, Anal & Test Ctr, Guangzhou 510640, Peoples R China.;[Liu, Hui] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Hu, Renzong; Lu, Zhongchen] S;South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.;South China Univ Technol, Sch Mech & Automot Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.
关键词：
Antimony sulfide;Plasma milling;Conversion reactions;Reversibility
摘要：
Poor reversibility of conversion and alloying reactions for Sb2S3 limits its application as high capacity anode for rechargeable lithium storage. Herein a facile high-efficiency plasma assisted milling (P-milling) was used to create Sb2S3-C hybrid nanostructure with disk-like Sb2S3 nanograins wrapped within ultrathin graphite nanosheets. Benefiting from the high structure stability and excellent Li+ ion diffusion kinetics in the graphite wrapped Sb2S3 nanostructure, highly reversible conversion and alloying reactions are maintained throughout the long-term cycles. The Sb2S3-C nanocomposite anode demonstrates a high stable capacity of 638.2 mA h g(-1) after 250 cycles at 200 mA g(-1) between 0.01 and 3.0 V vs. Li/Li+, with a high initial Coulombic efficiency of 78.3%. A reversible capacity of 496.1 mA h g(-1) is obtained after 500 cycles even at higher current rate of 1 A g(-1), much superior to those of the unmilled Sb2S3-C and P-milled Sb2S3 anodes. These demonstrate that P-milling could be a promising strategy to create high performance metal chalcogenide anode materials involved both conversion and alloying reactions toward lithium storage. (C) 2019 Elsevier Ltd. All rights reserved.
语种：
英文
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Cu modified ZnO nanoflowers as photoanode material for highly efficient dye sensitized solar cells
作者：
Zhuang, Shuxin* ;Lu, Mi* ;Zhou, Nan;Zhou, Litao;Lin, Daqin;...
期刊：
Electrochimica Acta ,2019年294:28-37 ISSN：0013-4686
通讯作者：
Zhuang, Shuxin;Lu, Mi
作者机构：
[Zhuang, Shuxin; Peng, Zhengyu; Lu, Mi; Zhou, Litao; Lin, Daqin; Zhuang, SX] Xiamen Univ Technol, Sch Mat Sci & Engn, Key Lab Funct Mat & Applicat Fujian Prov, Xiamen 361024, Peoples R China.;[Zhou, Nan] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wu, Qihui] Quanzhou Normal Univ, Sch Chem Engn & Mat Sci, Dept Chem Mat, Quanzhou 362000, Peoples R China.
通讯机构：
[Zhuang, SX; Lu, M] X;Xiamen Univ Technol, Sch Mat Sci & Engn, Key Lab Funct Mat & Applicat Fujian Prov, Xiamen 361024, Peoples R China.
关键词：
Dye-sensitized solar cells;Hydrothermal method;Cu modification;Zinc oxide
摘要：
The Cu-modified ZnO nanoflowers as photoanode material for dye sensitized solar cells are synthesized via a cetylmethylammonium bromide-assisted hydrothermal method. The main phase of the synthesized samples well matches the wurtzite type phase of ZnO. And the pure phase of Cu begins to appear and strengthen when the modified-Cu content excesses 1 wt%, indicating that Cu element not only dope into the lattice of ZnO but also cover on its surfaces. It is found that the morphologies of the ZnO samples can be tuned by the change of the modified-Cu content, from irregular nanoplates to cross-linked multi-leveled porous nanoflowers with a various Cu concentration of 0.5 wt%, 1 wt%, 1.5 wt% and 2 wt%, which further facilitate the dye adsorption and light-scattering. The photocurrent-voltage characteristics and electrochemical impedance spectroscopy are conducted to estimate the electrochemical properties of these solar cells with different Cu modification contents. Compared to the dye-sensitized solar cells with pure ZnO electrode, all the dye-sensitized solar cells with Cu-modified ZnO photoelectrodes present higher photovoltaic performance. The introduction of Cu into ZnO significantly enhances electron transport and retards charge recombination in the ZnO-dye interfaces, which induce the 84% improvement of short-circuit current density and 1.6 times enhancement of the power conversion efficiency for the dye-sensitized solar cells with 1.5 wt% Cu-modified ZnO photoelectrodes. (c) 2018 Elsevier Ltd. All rights reserved.
语种：
英文
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High performance isomeric Fe2O3 nanospheres anode materials derived from industrial wastewater for lithium ion batteries
作者：
Wu, Na;Zhang, Xue;Ma, Can;Shi, Ya-Ru;Zhou, Jin-Ming;...
期刊：
Electrochimica Acta ,2019年297:1028-1034 ISSN：0013-4686
通讯作者：
Liu, Hui;Wei, Yu;Zeng, Xian-Xiang
作者机构：
[Wang, Zhe; Zhang, Xue; Liu, Hui; Wei, Y; Shi, Ya-Ru; Wei, Yu; Ma, Can; Zhou, Jin-Ming; Wu, Na] Hebei Normal Univ, Key Lab Inorgan Nanomat Hebei Prov,Hebei Adv Thin, Natl Demonstrat Ctr Expt Chem Educ,Postdoctoral R, Coll Chem & Mat Sci,Coll Phys Sci & Informat Engn, Shijiazhuang 050016, Hebei, Peoples R China.;[Zeng, Xian-Xiang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Liu, H; Wei, Y; Zeng, Xian-Xiang] H;Hebei Normal Univ, Key Lab Inorgan Nanomat Hebei Prov,Hebei Adv Thin, Natl Demonstrat Ctr Expt Chem Educ,Postdoctoral R, Coll Chem & Mat Sci,Coll Phys Sci & Informat Engn, Shijiazhuang 050016, Hebei, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
会议名称：
Annual Meeting of the International-Society-of-Electrochemistry (ISE)
会议时间：
2017
会议地点：
Providence, RI
会议主办单位：
[Wu, Na;Zhang, Xue;Ma, Can;Shi, Ya-Ru;Zhou, Jin-Ming;Wang, Zhe;Liu, Hui;Wei, Yu] Hebei Normal Univ, Key Lab Inorgan Nanomat Hebei Prov,Hebei Adv Thin, Natl Demonstrat Ctr Expt Chem Educ,Postdoctoral R, Coll Chem & Mat Sci,Coll Phys Sci & Informat Engn, Shijiazhuang 050016, Hebei, Peoples R China.^[Zeng, Xian-Xiang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Batteries;Green chemistry;Electrochemical energy storage;Electrode materials;Nanomaterials
摘要：
A simple strategy which combines the treatment of industrial wastewater with the preparation of electrode materials was proposed in this work. And the industrial wastewater is the only iron source for the material preparation. The preparation method in this work is facile, economical and environment-friendly which includes two simple steps of low-temperature aqueous solution and one-step calcination. Moreover two kinds of high performance Fe2O3 anode materials (alpha-/gamma-Fe2O3 nano spheres, respectively) with isomerism can be obtained by simply adjusting calcination temperatures. Both of the alpha-Fe2O3 and gamma-Fe2O3 nanospheres show good lithium storing reversibility when used as anode materials in LIBs. Furthermore the as-prepared alpha-Fe2O3 nano-electrode with lower electrochemical impedance exhibit a far better electrochemical performance (about 74.1% capacity retention (calculated based on the lithiation) from the 1st to 5th cycle) than the gamma-one (only 39.0% capacity retention from the 1st to 5th cycle). The results here provide economical yet environment-friendly strategies for developing advanced anode material demanding both high energy and long lifespan for full-cell lithium battery. (C) 2018 Elsevier Ltd. All rights reserved.
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英文
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Chemical Transformation of Lead Halide Perovskite into Insoluble, Less Cytotoxic, and Brightly Luminescent CsPbBr3/CsPb2Br5 Composite Nanocrystals for Cell Imaging
作者：
Lou, Sunqi;Zhou, Zhi;Xuan, Tongtong* ;Li, Huili;Jiao, Ju;...
期刊：
ACS Applied Materials & Interfaces ,2019年11(27):24241-24246 ISSN：1944-8244
通讯作者：
Xuan, Tongtong;Gautier, Romain
作者机构：
[Jiao, Ju; Xuan, Tongtong; Gautier, Romain; Lou, Sunqi; Wang, Jing] Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Key Lab Bioinorgan & Synthet Chem, Minist Educ,Sch Chem,Sch Mat Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Hunan Prov Engn Technol Res Ctr Opt Agr, Changsha 410128, Hunan, Peoples R China.;[Gautier, Romain] Univ Nantes, Inst Mat Jean Rouxel IMN, 2 Rue Houssiniere,BP 32229, F-44322 Nantes 3, France.;[Li, Huili] East China Normal Univ, Sch Phys & Mat Sci, Minist Educ, Engn Res Ctr Nanophoton & Adv Instrument, Shanghai 200062, Peoples R China.;[Zhang, Hongwu] Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Pollutant Convers, Xiamen 361021, Fujian, Peoples R China.
通讯机构：
[Xuan, TT; Gautier, R] S;[Gautier, Romain] U;[Xuan, Tongtong] X;Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Key Lab Bioinorgan & Synthet Chem, Minist Educ,Sch Chem,Sch Mat Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China.;Univ Nantes, Inst Mat Jean Rouxel IMN, 2 Rue Houssiniere,BP 32229, F-44322 Nantes 3, France.
关键词：
perovskite;nanocrystals;water stability;photoluminescence;cell imaging
摘要：
Lead halide perovskite nanocrystals (NCs) have been widely investigated owing to their potential applications as optoelectronic devices. However, these materials suffer from poor water stability, which make them impossible to be applied in biomedicine. Here, insoluble CsPbBr3/CsPb2Br5 composite NCs were successfully synthesized via simple water-assisted chemical transformation of perovskite NCs. Water plays two key roles in this synthesis: (i) stripping CsBr from CsPbBr3/Cs4PbBr6 and (ii) modifying the coordination number of Pb2+ (six in CsPbBr3 and Cs4PbBr6 vs eight in CsPb2Br5). The as-prepared CsPbBr3/CsPb2Br5 composite NCs not only retain the photoluminescence quantum yield (up to 80%) and a narrow full width to half-maximum of 16 nm, but also present excellent water stability and low cytotoxicity. With these properties, the CsPbBr3/CsPb2Br5 composite NCs were demonstrated as efficient fluorescent probes in live HeLa cells. We believe that our finding not only provides a new method to prepare insoluble, narrow-band, and brightly luminescent CsPbBr3/CsPb2Br5 composite NCs, but also extend the potential applications of lead halides in biomedicine. © 2019 American Chemical Society.
语种：
英文
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Synthesis and photoluminescence properties of novel red-emitting phosphor SrAl3BO7:Mn4+ with enhanced emission by Mg2+/Zn2+/Ca2+ incorporation for plant growth LED lighting
作者：
Zhong, Yuan;Zhou, Nan;Xia, Mao;Zhou, Yue;Chen, Hongxi;...
期刊：
Ceramics International ,2019年45(17):23528-23539 ISSN：0272-8842
通讯作者：
Zhou, Zhi
作者机构：
[Xia, Mao; Chen, Hongxi; Zhong, Yuan; Zhou, Nan; Zhou, Zhi; Zhou, Yue] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Chen, Hongxi; Zhong, Yuan; Zhou, Nan; Zhou, Zhi; Zhou, Yue] Hunan Prov Engn Technol Res Ctr Opt Agr, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhou, Zhi] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Phosphors;SrAl3BO7:Mn-4(+);Photoluminescence;Red emission;Plant growth LED lighting
摘要：
Indoor cultivation has attracted more and more concerns in the last few years. Searching for ideal red-emitting phosphors for this application has been a great challenge. In this paper, a novel red-emitting phosphor SrAl3BO7:Mn4+ (SABO:Mn4+) had been synthesized through a modified hydrothermal reaction method for the first time. Three kinds of effect parameters, including hydrothermal reacting time, sintering temperature and Mn4+ doping concentration, were comprehensively considered to optimize the phase purity and luminescent properties of the SABO:Mn4+ phosphor. Besides, the luminescent properties of SABO:Mn4+ was systematically investigated through UV–vis absorption spectra, PLE and PL spectra, CIE chromaticity coordinate and decay times. The excitation band of this phosphor locates in the wavelength range of 250–550 nm, resulting from Mn4+ → O2− charge transfer and electron transitions from 4A2–4T1, 2T2 and 4T2 energy levels. Meanwhile, a sharp emission band is detected from 600 to 700 nm with two emission peaks located at 648 and 662 nm, which is assigned to 2E → 4A2 characteristic transition of Mn4+. In addition, Mg2+/Zn2+/Ca2+ are co-doped as charge compensators to improve the luminescent properties of SABO:0.03Mn4+. The impacts of doping concentration of Mg2+/Zn2+/Ca2+ on the photoluminescent intensity, QE and thermal stability of SABO:0.03Mn4+ phosphor is investigated carefully. The corresponding mechanism is discussed via decay times, EPR spectra and configurational coordinated diagram. More importantly, the EL spectrum of as-fabricated pc-LED device matches well with the absorption of plant pigments, demonstrating this novel phosphor can regard as a promising red-emitting luminescent material to meet the light requirement in plant growth LED lighting. © 2019 Elsevier Ltd and Techna Group S.r.l.
语种：
英文
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Carbon nanodot-decorated alveolate N, O, S tridoped hierarchical porous carbon as efficient electrocatalysis of polysulfide conversion for lithium-sulfur batteries
作者：
Zhong, Mei-e;Guan, Jindiao;Sun, Jingchun;Guo, Hui;Xiao, Zhubing;...
期刊：
Electrochimica Acta ,2019年299:600-609 ISSN：0013-4686
通讯作者：
Gui, Qingwen
作者机构：
[Zhong, Mei-e; Sun, Jingchun; Guo, Hui; Gui, Qingwen; Zhou, Nan; Guan, Jindiao] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xiao, Zhubing] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China.;[Gong, Daoxin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Gui, Qingwen] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Lithium-sulfur batteries;Tobacco stem;Nanodots-decorated;Alveolate;Tridoped
摘要：
Rechargeable lithium-sulfur (Li-S) batteries are a significant energy-storage device owing to their eco-friendliness and high theoretical energy density. However, the shuttle effect of soluble polysulfides as well as the slow redox kinetics constrains the development of Li-S batteries. Herein, carbon nanodots-decorated alveolate N, O, S tridoped hierarchical porous carbon (a-NOSPC) material is synthesized via facile pyrolysis of tobacco stem. The coexistence of micropores, mesopores, and macropore in the hierarchical porous carbon are beneficial for physical accommodating/immobilizing active materials sulfur and rapid charge/ion transfer. Meanwhile, the N, O, S dopants provide rich electrocatalytic active site in chemical binding of polysulfides and their accelerated redox kinetics, thus guaranteeing high utilization on active materials. The resultant a-NOSPC/S cathode with an 2.7 mg cm(-2) areal sulfur loading delivers a high reversible areal capacity of 2.90mAh cm(-2) at 0.1 C, maintaining 2.01mAh cm(-2) over 100 cycles, which is obviously superior to the most reported biochar-based electrodes. Our results provide an appealing avenue to the design of multifunctional sulfur host for advanced Li-S batteries. (C) 2019 Elsevier Ltd. All rights reserved.
语种：
英文
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Multifunctional G-quadruplex-based fluorescence probe coupled with DNA-templated AgNCs for simultaneous detection of multiple DNAs and MicroRNAs
作者：
Han, Yunpeng;Zhang, Feng;Gong, Hang* ;Cai, Changqun*
期刊：
Analytica Chimica Acta ,2019年1053:105-113 ISSN：0003-2670
通讯作者：
Gong, Hang;Cai, Changqun
作者机构：
[Cai, Changqun; Gong, Hang; Cai, CQ; Han, Yunpeng] Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat, Coll Chem,Minist Educ, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Gong, H; Cai, CQ] X;Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat, Coll Chem,Minist Educ, Xiangtan 411105, Peoples R China.
关键词：
DNA-Templated AgNCs;Fluorescent;G-quadruplex-based;Multifunctional;Simultaneous detection
摘要：
A rapid, label-free, and multifunctional fluorescent probe for simultaneous detection of multiple targets was fabricated based on G-quadruplexes and DNA-templated silver nanoclusters (AgNCs). In this work, a probe with two capitated recognized regions was coupled with a locked G-quadruplex at the 5′-terminus and dark AgNC at the 3′-terminus. Upon the addition of the virus subtype H5N1 gene or microRNA-141, only the sequence of the G-quadruplex was released and bound with Thioflavin T (ThT) for a specific fluorescent response. On the contrary, with the presence of the influenza virus subtype H1N1 gene or microRNA-21, the fluorescence intensity was enhanced because of two split AgNCs approaching closely to produce a nanocluster dimer. Subsequently, with multiple target addition, fluorescence signals were produced for both G-quadruplexes and AgNCs. Moreover, this single and duplex detection for virus DNAs and microRNAs, which provides a versatile platform for different targets, was sufficiently sensitive for the expected detection limit, and still possessed unique selectivity with similar oligonucleotides. The simultaneous detection of targets in biological fluids indicated that there is great opportunity for this strategy to be further applied in biomedical research and clinical diagnosis. © 2018 Elsevier B.V.
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英文
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Insight into effect of CaCO3 on reduction roasting of fine-grained silicate type iron oxide ore and its application on Fe separation and recovery
作者：
Wu, Fangfang;Deng, Jie;Mi, Baobin;Xiao, Zhu;Kuang, Jiaqi;...
期刊：
Powder Technology ,2019年356:170-176 ISSN：0032-5910
通讯作者：
Yu, Peng;Liu, Biqiong
作者机构：
[Kuang, Jiaqi; Yu, Peng; Xiao, Zhu; Deng, Jie; Liu, Hui; Wu, Fangfang; Liang, Min] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Mi, Baobin] Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Hunan, Peoples R China.;[Liu, Biqiong] Hunan Agr Univ, Grad Sch, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Yu, Peng; Liu, Biqiong] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Grad Sch, Changsha 410128, Hunan, Peoples R China.
关键词：
Fined-grained iron ore;CaCO3;Alkali lignin;Microwave;Silicate gangue removal
摘要：
To solve the problem of processing of refractory iron oxide ore resulted from its fine-grained disseminated structure, in this paper, an improved technology was innovatively proposed, which consisted of three stages of reduction roasting-acid leaching followed by magnetic separation, and CaCO3 was introduced during roasting process. Mechanism analyses indicated that kaolinite, a major gangue in ore, can be thermally dehydrated to amorphous metakaolin during roasting process, and CaCO3 can in part react with metakaolin-converting the stable kaolinite gangue mineral into acid-soluble Ca3Al2(SiO4)(3), and subsequently Ca3Al2(SiO4)(3) was selectively removed by acid leaching process. Moreover, the presence of CaCO3 can also improve the gathering state of Fe-rich particles, which is beneficial for magnetic separation. Iron concentrate obtained via the proposed technology contained 53.73% Fe, 9.02% Mn, 7.51% Al, and 2.46% Si, with a Fe recovery ratio of 88.20%, which surely meet the iron ore quality requirement of steel and iron industry. (C) 2019 Published by Elsevier B.V.
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英文
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Attapulgite-supported nano-Fe0/peroxymonsulfate for quinclorac removal: Performance, mechanism and degradation pathway
作者：
Ding, Chunxia;Xiao, Sijia;Lin, Yingjun;Yu, Peng;Zhong, Mei-e;...
期刊：
Chemical Engineering Journal ,2019年360:104-114 ISSN：1385-8947
通讯作者：
Deng, Yaocheng;Gong, Daoxin
作者机构：
[Yu, Peng; Ding, Chunxia; Lin, Yingjun; Xiao, Sijia; Zhong, Mei-e] Hunan Agr Univ, Coll Sci, Changsha 410082, Hunan, Peoples R China.;[Su, Long; Yang, Lihua; Zhou, Yaoyu; Deng, Yaocheng; Gong, Daoxin; Liao, Chanjuan; Wang, Han] Hunan Agr Univ, Coll Resource & Environm, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Deng, YC; Gong, DX] H;Hunan Agr Univ, Coll Resource & Environm, Changsha 410082, Hunan, Peoples R China.
关键词：
Attapulgite;Peroxymonosulfate;Quinclorac;Removal;Zero valent iron
摘要：
A nanocomposite of nZVI/ATP with nanoscale zero-valent iron(nZVI) supported on attapulgite(ATP) was synthesized for activating peroxymonosulfate (PMS) to generate reactive free radicals for quinclorac removal. The microstructures of nZVI/ATP were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, Scanning electron microscopy, and N2 adsorption-desorption. The effect factors of nZVI/ATP-PMS system on quinclorac degradation were tested, including PMS dosage, nZVI/ATP dosage, initial solution pH, initial quinclorac concentration, common existing ions and temperature. Quinclorac degradation products were identified by LC-MS/MS, and the possible degradation mechanism was proposed. The results showed that nanoscale zero-valent iron (nZVI) was evenly dispersed on the attapulgite surface, which effectively prevents the agglomeration and oxidation of nZVI and improves its catalytic performance. The removal efficiency of quinclorac was 97.36%, in an hour using 0.5 g/L nZVI/ATP3 and 10 mM PMS. The total organic carbon was removed as high as 79.97%. Quinclorac was degraded into five major products by chemical reactions of hydroxyl substitution, oxidation and ring-cleavage. Finally, most of the degradation products were mineralized into inorganics such as CO2, H2O or something else. It turned out that nZVI/ATP-PMS was a highly efficient catalytic degradation system for removing quinclorac residues in aqueous solution. © 2018 Elsevier B.V.
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英文
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Enhancing quantum efficiency and tuning photoluminescence properties in far-red-emitting phosphor Ca14Ga10Zn6O35:Mn4+ based on chemical unit engineering
作者：
Zhong, Yuan;Gai, Shujie;Xia, Mao;Gu, Simin;Zhang, Yongli;...
期刊：
Chemical Engineering Journal ,2019年374:381-391 ISSN：1385-8947
通讯作者：
Zhou, Nan;Zhou, Zhi
作者机构：
[Xia, Mao; Zhang, Yongli; Zhong, Yuan; Gai, Shujie; Zhou, Nan; Zhou, Zhi; Wu, Xianbo; Gu, Simin] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wang, Jing] Sun Yat Sen Univ, Sch Chem, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China.;[Wang, Jing] Sun Yat Sen Univ, Sch Mat Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China.
通讯机构：
[Zhou, N; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Ca14Ga10Zn6O35:Mn4+;Chemical unit engineering;Plant growth LED lighting;Quantum efficiency;Tunable emission
摘要：
Mn4+ activated Ca14Ga10Zn6O35 (CGZO)have attracted much attention for the usages of white light-emitting-diodes (WLEDs), solar cells and plant growth LEDs. In this paper, we conducted chemical unit engineering in CGZO:Mn4+ by substituting Ge4+-M+ (M = Li, Na, K)for Ga3+-Ca2+. The impacts of Ge4+-M+ (M = Li, Na, K)substitution on the crystal structure, photoluminescence properties, quantum efficiency (QE)and thermal stability were investigated systematically. With the increase of Ge4+-Li+/Na+ and Ge4+-K+, the diffraction peaks moved towards higher and lower angle, respectively. The greatest improvement of emission intensity in Ge4+-Li+/Na+/K+ co-doped CGZO:Mn4+ reached up to 169.4%, 195.0% and 198.9%. Moreover, an obvious red shift (∼3.6 nm)was detected in Ge4+-Li+ case and this change was interpreted by Tanabe–Sugano diagram. The IQE and EQE of Ge4+-Li+/Na+/K+ co-doped CGZO:Mn4+ showed remarkable improvements. The highest values of IQE and EQE were found to be 50.9% and 38.9% in Ge4+-K+ incorporated sample. Furthermore, conducting chemical unit engineering in CGZO:Mn4+ could slightly enhance its thermal stability. The configurational coordinated diagram was employed to understand this enhancement comprehensively. Finally, LED devices were fabricated by using Ge4+-Li+ co-doped CGZO:Mn4+ phosphor as light convertor. The excellent electronic luminescence (EL)properties and matchable emission with the absorption of plant pigments demonstrating that these phosphors have promising application in plant growth LED lighting. © 2019 Elsevier B.V.
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英文
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Surface-Wrinkle-Modified Graphite Felt with High Effectiveness for Vanadium Redox Flow Batteries
作者：
Chen, Zehua;Gao, Yu;Zhang, Chuanxiang* ;Zeng, Xianxiang;Wu, Xiongwei*
期刊：
Advanced Electronic Materials ,2019年5(7):1900036- ISSN：2199-160X
通讯作者：
Zhang, Chuanxiang;Wu, Xiongwei
作者机构：
[Zhang, Chuanxiang; Gao, Yu; Chen, Zehua] Henan Polytech Univ, Coll Chem & Chem Engn, Jiaozuo 454000, Henan, Peoples R China.;[Chen, Zehua] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China.;[Zeng, Xianxiang; Wu, Xiongwei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhang, Chuanxiang; Wu, Xiongwei] H;Henan Polytech Univ, Coll Chem & Chem Engn, Jiaozuo 454000, Henan, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
all-vanadium redox flow batteries;fast ion conduction;graphite felt;surface-wrinkle modification
摘要：
Surface-wrinkle-modified graphite felt (GF) with abundant N and O is prefabricated by a hydrothermal method followed by calcination, and its surface morphology, elemental composition, and electrochemical properties are characterized by scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and charge/discharge tests. The highly folded coating has excellent wettability, abundant catalytic sites, a fast ion-diffusion rate, ultralow interface transfer resistance, and high catalytic activity for VO2+/VO2+ and V2+/V3+ reaction couples. Compared with the original GF, the modified GF greatly increases the redox reversibility of the VO2+/VO2+ and V2+/V3+ couples according to cyclic voltammetry profiles. The cathodic and anodic peak potential difference for VO2+/VO2+ substantially decreases from 542 to 388 mV. A battery based on surface-wrinkle-modified GF exhibits overall improved efficiency, higher power density, and a high reversible efficiency with a stable average energy efficiency of 78% at a current density of 150 mA cm−2 for 200 charge/discharge cycles. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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Highly Active Co-Based Catalyst in Nanofiber Matrix as Advanced Sensing Layer for High Selectivity of Flexible Sensing Device
作者：
Wang, Kang;Li, Jing;Li, Wei;Wei, Wei;Zhang, Hao;...
期刊：
Advanced Materials Technologies ,2019年4(2):1800521- ISSN：2365-709X
通讯作者：
Wang, Lili
作者机构：
[Wang, Lili; Wang, Kang] Jilin Univ, State Key Lab Integrated Optoelect, Coll Elect Sci & Engn, Changchun 130012, Jilin, Peoples R China.;[Li, Jing] Jilin Univ, Hosp 1, Ctr Cardiovasc Dis, Changchun 130021, Peoples R China.;[Li, Wei] Hunan Agr Univ, Coll Sci, Changcha 410128, Peoples R China.;[Wei, Wei] Jilin Univ, Lab Theoret & Computat Chem, Inst Theoret Chem, Changchun 130012, Jilin, Peoples R China.;[Zhang, Hao] Shenzhen Technol Univ, Coll Hlth & Environm Engn, Shenzhen 518118, Peoples R China.
通讯机构：
[Wang, Lili] J;Jilin Univ, State Key Lab Integrated Optoelect, Coll Elect Sci & Engn, Changchun 130012, Jilin, Peoples R China.
关键词：
1D heteronanofibers;density functional theory;flexible sensing devices;high active facets;high selective sensitivity
摘要：
An efficient and economic sensing material for flexible chemical sensors is increasingly in great demand as a result of its potential application in the healthcare and environmental detection systems. Endowing the nanomaterials with high active facets serves as a promising method for the design of nanomaterials with advanced functionalities. New physicochemical properties of chemical sensor can be obtained by using high active facets nanoparticles combined in one-dimensional (1D) nanofiber/wires. However, it remains a great challenge to conduct the development of 1D heterostructure sensing materials with high selectivity, in particular the ones that can perform under room temperature. Here, a high performance flexible sensing device based on Co3O4 nanoparticles with specific (112) facet in α-Fe2O3 nanofiber is reported. The heterointerfaces and grain boundary allow the fast electrons transportation in sensing reactions and the (112) facets in Co3O4 nanoparticles provide a large number of highly active sites where the selective absorption of ammonia gas molecules occurs. Consequently, the flexible gas sensor exhibits ultrahigh sensitivity (417%) and mechanical stability to ammonia gas molecules, which are proved by using density functional theory calculations. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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Two-grid methods for semi-linear elliptic interface problems by immersed finite element methods
作者：
Wang, Yang;Chen, Yanping* ;Huang, Yunqing;Liu, Ying
期刊：
应用数学和力学：英文版 ,2019年40(11):1657-1676 ISSN：0253-4827
通讯作者：
Chen, Yanping
作者机构：
[Wang, Yang; Liu, Ying; Huang, Yunqing] Xiangtan Univ, Sch Math & Computat Sci, Xiangtan 411105, Hunan, Peoples R China.;[Chen, Yanping] South China Normal Univ, Sch Math Sci, Guangzhou 510631, Guangdong, Peoples R China.;[Liu, Ying] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Chen, Yanping] S;South China Normal Univ, Sch Math Sci, Guangzhou 510631, Guangdong, Peoples R China.
关键词：
two-grid method;interface problem;finite element method;immersed interface
摘要：
In this paper, two-grid immersed finite element (IFE) algorithms are proposed and analyzed for semi-linear interface problems with discontinuous diffusion coefficients in two dimension. Because of the advantages of finite element (FE) formulation and the simple structure of Cartesian grids, the IFE discretization is used in this paper. Two-grid schemes are formulated to linearize the FE equations. It is theoretically and numerically illustrated that the coarse space can be selected as coarse as H = O(h1/4) (or H = O(h1/8)), and the asymptotically optimal approximation can be achieved as the nonlinear schemes. As a result, we can settle a great majority of nonlinear equations as easy as linearized problems. In order to estimate the present two-grid algorithms, we derive the optimal error estimates of the IFE solution in the Lp norm. Numerical experiments are given to verify the theorems and indicate that the present two-grid algorithms can greatly improve the computing efficiency. © 2019, Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature.
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英文
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Improving the electrochemical properties of SiO@C anode for high-energy lithium ion battery by adding graphite through fluidization thermal chemical vapor deposition method
作者：
Xia, Mao;Li, Yiran;Zhou, Zhi;Wu, Yufan;Zhou, Nan;...
期刊：
Ceramics International ,2019年45(2):1950-1959 ISSN：0272-8842
通讯作者：
Zhang, Hongbo;Xiong, Xiang
作者机构：
[Xia, Mao; Xiong, Xiang; Zhang, Hongbo] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.;[Wu, Yufan; Zhou, Zhi; Zhou, Nan; Li, Yiran] Hunan Agr Univ, Coll Sci, Hunan Prov Engn Technol Res Ctr Opt Agr, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhang, HB; Xiong, X] C;Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
关键词：
Fluidization thermal chemical vapor deposition;Lithium ion batteries;Silicon monoxide;SiO/[email protected]
摘要：
A series SiO/[email protected] (SGC) composites electrode are successfully prepared by a fluidization thermal chemical vapor deposition (FTCVD) route in a kilogram-scale fluidized bed CVD equipment. This strategy can avoid the effect of particle agglomeration on carbon coating during heating reaction. The phase composition, element distribution, particle appearance and electrochemical properties of the as-obtained SGC composite is investigated in detail. The charge specific capacity of SGC-37 is close to 799.1 mAh g−1 after 100 cycles at 200 mA g−1. The SGC-37 shows a high capacity retention of 93.7% after 100 cycles, which much higher than that of SiO, [email protected], SGC-73 and SGC-55 (the retention rates are 26.3%, 56.8%, 75.5% and 89.6%, respectively). The reason is mainly because improve Li ion diffusion coefficient, shorten transfer pathway of Li ion and ease to the volume change of SiO due to surface carbon coating and graphite addition. The FTCVD methods is not only an efficient method to prepared SGC anode, but also is may easy to apply to surface carbon coating of another particle material. © 2018 Elsevier Ltd and Techna Group S.r.l.
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英文
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Revealing the Reaction Mechanism of Sodium Selenide Confined within a Single-Walled Carbon Nanotube: Implications for Na-Se Batteries
作者：
Wang, Liang;Zhang, Xingming;Deng, Lei;Tang, Jianfeng;Deng, Huiqiu* ;...
期刊：
ACS Applied Materials & Interfaces ,2019年11(5):4995-5002 ISSN：1944-8244
通讯作者：
Deng, Huiqiu;Hu, Wangyu;Liu, Zhixiao
作者机构：
[Deng, Lei; Tang, Jianfeng; Wang, Liang; Zhang, Xingming] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Deng, Huiqiu] Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China.;[Hu, Wangyu; Liu, Zhixiao] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Deng, Huiqiu; Hu, WY; Liu, ZX] H;Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China.;Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Na-Se battery;ab initio molecular dynamics;conductivity;density functional theory computation;nanoconfinement;polaron;reaction mechanism
摘要：
The sodium-selenium (Na-Se) battery is a competitive candidate as the practical next-generation energy storage device. A Na 16 Se 8 cluster confined within a (10, 10) single-walled carbon nanotube is constructed to reveal the nanoconfinement effect on the reaction mechanism of the Na-Se battery cathode. It is found that the nanoconfinement can enhance the electronic conductivity of Na x≥12 Se 8 nanostructures because itinerant electrons appear under this condition. During desodiation, polyselenide chains grow longer and the intermediate products become insulators for transferring electrons. However, hole polarons have the potential to act as charge carriers in Na x≤10 Se 8 nanostructures. The open-circuit voltage profile is plotted, and the voltage window is 1.67 ≤ U ≤ 1 V. After the first charge cycle, the cathode cannot discharge to Na 16 Se 8 , but the reversible specific capacity can still arrive at 302 mA h/g of the cathode composite. © 2019 American Chemical Society.
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英文
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