A High-efficiency blue-LED-excitable NIR-II-emitting MgO:Cr3+,Ni2+ phosphor for future broadband light source toward multifunctional NIR spectroscopy applications
作者：
Liu, Bo-Mei;Guo, Xiao-Xuan;Cao, Lu-Yu;Huang, Lin;Zou, Rui;...
期刊：
Chemical Engineering Journal ,2023年452:139313 ISSN：1385-8947
通讯作者：
Zou, Rui(zourui@mail2.sysu.edu.cn)
作者机构：
[Cao, Lu-Yu; Guo, Xiao-Xuan; Liu, Bo-Mei; Huang, Lin; Wang, Jing] Sun Yat Sen Univ, Sch Chem, State Key Lab Optoelect Mat & Technol, Minist Educ,Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Peoples R China.;[Zou, Rui] Sun Yat Sen Univ, Affiliated Hosp 3, Dept Nucl Med, 600 Tianhe Rd, Guangzhou 510630, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.
通讯机构：
[Rui Zou] D;[Zhi Zhou] C;[Jing Wang] M;Department of Nuclear Medicine, The Third Affiliated Hospital of Sun Yat-Sen University, 600 Tianhe Road, Guangzhou 510630, China<&wdkj&>College of Science, Hunan Optical Agriculture Engineering Technology Research Center, Hunan Agricultural University, Changsha City, Hunan 10128, China<&wdkj&>Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
关键词：
Ni;NIR spectroscopy;NIR-II luminescence;Phosphor-converted LED
摘要：
The development of phosphor-converted light-emitting diodes (pc-LEDs) in the second near-infrared window (NIR-II, 1000–1700 nm) represents an important, newly emerging, and dynamic field in NIR spectroscopy. Unfortunately, lacking efficient NIR-II phosphors that can be excited by commercial blue LED chips impedes NIR spectroscopy applications. Herein, a donor–acceptor strategy is developed by introducing Cr3+ sensitizers to greatly enhance the blue-light excitation efficiency of NIR-II-emitting MgO:Cr3+,Ni2+ phosphor. Consequently, a high-efficiency blue-light-excitable MgO:Cr3+,Ni2+ phosphor that gives a NIR-II emission at 1335 nm with a full width at half-maximum (FWHM) of 235 nm, is demonstrated. The product has a high internal quantum efficiency of 92.7 % and excellent thermal stability, maintaining 83.0 % of the room temperature emission intensity at 150 °C. Excitingly, the fabricated NIR-II pc-LED device shows a high NIR-II optical power (27.4 mW@350 mA). The performances of the achieved NIR-II pc-LED are almost the best results until now. Additionally, multifunctional applications including nondestructive detection and anti-counterfeiting of the NIR-II light source are demonstrated. These results are pretty crucial for the further development of NIR-II spectroscopy and imaging technology. © 2022 Elsevier B.V.
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Molecular dynamic simulations of plasticity and phase transition in Mg polycrystalline under shock compression
作者：
Jian, Zhiyong;Chen, Yangchun;Xiao, Shifang* ;Wang, Liang;Li, Xiaofan;...
期刊：
APPLIED PHYSICS EXPRESS ,2022年15(1):015503 ISSN：1882-0778
通讯作者：
Xiao, Shifang
作者机构：
[Xiao, Shifang; Chen, Yangchun; Deng, Huiqiu; Li, Xiaofan; Jian, Zhiyong] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Peoples R China.;[Wang, Liang] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Hu, Wangyu; Wang, Kun] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
通讯机构：
[Xiao, Shifang] H;Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Peoples R China.
关键词：
molecular dynamics simulation;hexagonal columnar nanocrystalline;shock compression;plasticity;phase transition
摘要：
We have investigated the shock-induced plasticity and phase transition in the hexagonal columnar nanocrystalline Mg by large-scale nonequilibrium molecular dynamics simulations. The preexisting grain boundaries (GBs) induce the nucleation of the {10-12} twins for the local stress relaxation. The twins grow up in grains leading to the orientation rotation. The phase transition from the hexagonal close-packed phase to the body-centered cubic phase begins when the migrating twin GBs meet in A- A nd C-type grains, and continues in the plastic deformation regions. The phase-transition pathway involves two steps: The reorientation and phase transformation. © 2022 The Japan Society of Applied Physics.
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英文
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Study on the relationship between surface and dislocation of nanoporous copper under cyclic shear loading
作者：
Wang, Yufeng;Bi, Wenbo;Deng, Lei;Zhang, Xingming;Tang, Jianfeng;...
期刊：
Magnetism and Magnetic Materials ,2022年12(3):035318 ISSN：2158-3226
通讯作者：
Wang, Liang(wangliang0329@hunau.edu.cn)
作者机构：
[Wang, Yufeng; Deng, Lei; Bi, Wenbo; Tang, Jianfeng; Wang, Liang; Zhang, Xingming] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
通讯机构：
[Wang, L.] C;College of Science, Hunan Agricultural University, Changsha, China
摘要：
In this paper, molecular dynamics simulation is conducted to study the relationship between the surface and dislocation of nanoporous copper under cyclic shear loading. The results show that the dislocation and the surface have both mutual promotion and competition relationship. On one hand, the surface becomes rough owing to reconstruction caused by cyclic shear, which promotes the dislocation activities, while the dislocation activities also accelerate the process of surface reconstruction. On the other hand, there is a competition between surface reconstruction and dislocation activities: in the early cycles, the dislocation density is low, and surface reconstruction dominates stress release; in the late cycles, the surface tends to be stable, and then, the dislocation activities dominate. © 2022 Author(s).
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英文
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Manganese Ion-Sensitized Near-Infrared Light in Cs2NaBi1−xErxCl6 Lead-Free Double Perovskite
作者：
Gan, Weijiang;Liu, Bo-Mei;Huang, Lin;Lou, Sunqi;Zhang, Jian;...
期刊：
Advanced Optical Materials ,2022年10(9):2102851- ISSN：2195-1071
通讯作者：
Wang, J;Zhang, J;Zhou, Z
作者机构：
[Gan, Weijiang; Lou, Sunqi; Liu, Bo-Mei; Wang, Jing; Huang, Lin] Sun Yat Sen Univ, Sch Mat Sci & Engn, Sch Chem,Key Lab Bioinorgan & Synthet Chem, State Key Lab Optoelect Mat & Technol,Minist Educ, Guangzhou 510275, Peoples R China.;[Zhang, Jian; Zhang, J] Guilin Univ Elect Technol, Sch Mat Sci & Engn,Minist Educ, Guangxi Collaborat Innovat Ctr Struct & Property, Guangxi Key Lab Informat Mat,Engn Res Ctr Elect I, Guilin 541004, Guangxi, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Coll Sci, Changsha 10128, Hunan, Peoples R China.;[Wang, Jing] Jiaying Univ, Sch Chem & Environm, Meizhou Micronano Elect Mat R&D Platform, Guangdong Engn Technol Developing Ctr High Perfor, Meizhou 514015, Peoples R China.
通讯机构：
[Wang, J ] S;[Zhang, J ] G;[Zhou, Z ] H;Sun Yat Sen Univ, Sch Mat Sci & Engn, Sch Chem,Key Lab Bioinorgan & Synthet Chem, State Key Lab Optoelect Mat & Technol,Minist Educ, Guangzhou 510275, Peoples R China.;Guilin Univ Elect Technol, Sch Mat Sci & Engn,Minist Educ, Guangxi Collaborat Innovat Ctr Struct & Property, Guangxi Key Lab Informat Mat,Engn Res Ctr Elect I, Guilin 541004, Guangxi, Peoples R China.
关键词：
double perovskites;energy transfer;ion doping;near-infrared
摘要：
Lead-free double perovskites (DPs) with unique optical properties are of interest for broad applications. However, improving near-infrared (NIR) photoluminescence (PL) in lead-free DPs is still a challenge. Herein, in order to increase the NIR PL intensity and extend the infrared multicolor luminescence, transition metal Mn2+ is doped into Cs2NaBi1−xErxCl6 lead-free DPs. Steady-state and time-resolved PL studies show that efficient energy transfer from Mn2+ to Er3+ is obtained, leading to NIR PL at ≈1.54µm can be enhanced 11-fold compared to Er3+ singly alloyed sample and a PL quantum yield of ≈14.2%. Moreover, the Mn2+-mediated sensitized strategy can expand to other NIR lanthanide ions (Ho3+ at ≈0.98µm or Nd3+ at ≈1.07µm). The as-synthesized Mn2+ doped Cs2NaBi1−xErxCl6 DPs exhibit robust stability against heat, ultraviolet light, and environmental oxygen/moisture. Finally, the lead-free DPs phosphor-converted multifunctional white light-emitting diode device containing visible and NIR light is fabricated. This work guides constructing energy transfer pathways in DPs and opens new perspectives for the development of lanthanide-functionalized DPs as promising materials for optoelectronic devices operating in the NIR region. © 2022 Wiley-VCH GmbH.
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英文
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Role of local chemical fluctuations in the melting of medium entropy alloy CoCrNi
作者：
Jian, Wu-Rong* ;Wang, Liang;Bi, Wenbo;Xu, Shuozhi;Beyerlein, Irene J.
期刊：
Applied Physics Letters ,2021年119(12):121904 ISSN：0003-6951
通讯作者：
Jian, Wu-Rong
作者机构：
[Xu, Shuozhi; Jian, Wu-Rong; Beyerlein, Irene J.] Univ Calif Santa Barbara, Dept Mech Engn, Santa Barbara, CA 93106 USA.;[Bi, Wenbo; Wang, Liang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Beyerlein, Irene J.] Univ Calif Santa Barbara, Mat Dept, Santa Barbara, CA 93106 USA.
通讯机构：
[Jian, Wu-Rong] U;Univ Calif Santa Barbara, Dept Mech Engn, Santa Barbara, CA 93106 USA.
摘要：
Medium- to high-entropy alloys are characterized by fluctuations in chemical composition, i.e., lattice distortion (LD) and chemical short-range ordering (CSRO). However, their roles in the melting of these alloys are still unclear. Using a combination of molecular dynamics and x-ray diffraction simulations, we investigate the effects of LD and CSRO on the melting of single crystalline CoCrNi, a medium entropy alloy (MEA). LD accelerates the melting process and reduces the melting temperature by lowering the energy barrier of the nucleation of amorphous clusters and then promoting the formation of amorphization. By contrast, CSRO divides CoCrNi MEA into CoCr clusters and Ni segregated regions, localizing LD to the CoCr regions and the boundaries between CoCr clusters and Ni regions. Such a LD localization reduces the area for the nucleation of the amorphous clusters in the ordered MEA at the start of melting, resulting in a lower free energy and, thus, a much higher melting temperature than the random MEA without CSRO. As the temperature rises in the ordered MEA, the degree of CSRO decreases slightly in the beginning and then experiences a rapid reduction in the last stage of melting. © 2021 Author(s).
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英文
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Molecular dynamics simulation of shock wave propagation and spall failure in single crystal copper under cylindrical impact
作者：
Chen, Ying;Jian, Zhiyong;Xiao, Shifang;Wang, Liang;Li, Xiaofan;...
期刊：
APPLIED PHYSICS EXPRESS ,2021年14(7):075504 ISSN：1882-0778
通讯作者：
Xiao, Shifang(shifangxiao@hnu.edu.cn)
作者机构：
[Xiao, Shifang; Deng, Huiqiu; Chen, Ying; Li, Xiaofan; Jian, Zhiyong] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Peoples R China.;[Wang, Liang] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Hu, Wangyu; Wang, Kun] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
通讯机构：
[Xiao, S.] D;Department of Applied Physics, China
关键词：
Molecular dynamic;Cylindrical converging impact;Shock-wave profile;Premelting;Spallation
摘要：
The shock premelting and spallation of single crystal copper under cylindrical converging impact are studied using molecular dynamics simulations. For the axis of a cylindrical potential wall along the [001] crystallographic direction, the anisotropy of shock response is very obvious at the shock strength 1.4 km s-1. Premelting occurs at the wavefront in the 110 direction, but not in the 100 direction. As a result of the converging effect, the requisite shock strength for generating premelting decreases in comparison with planar shock. Under the interaction of reflected wave and unloaded wave, the nucleation of spallation occurs in premelting tensile regions. © 2021 The Japan Society of Applied Physics.
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英文
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What will happen when microorganisms "meet" photocatalysts and photocatalysis?
作者：
Deng, Yaocheng* ;Li, Zaiyun;Tang, Rongdi;Ouyang, Kai;Liao, Chanjuan* ;...
期刊：
Environmental Science: Nano ,2020年7(3):702-723 ISSN：2051-8153
通讯作者：
Deng, Yaocheng;Liao, Chanjuan
作者机构：
[Liao, Chanjuan; Ouyang, Kai; Deng, Yaocheng; Tang, Rongdi; Su, Long; Gong, Daoxin; Yang, Lihua; Li, Zaiyun; Fang, Yi; Liao, CJ] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Liao, Chanjuan; Deng, Yaocheng; Tang, Rongdi; Su, Long; Gong, Daoxin; Yang, Lihua; Li, Zaiyun; Fang, Yi; Liao, CJ] Hunan Agr Univ, Inst Agr Environm Protect, Changsha 410128, Peoples R China.;[Ding, Chunxia] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
通讯机构：
[Deng, YC; Liao, CJ] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;Hunan Agr Univ, Inst Agr Environm Protect, Changsha 410128, Peoples R China.
摘要：
In recent years, photocatalytic technology has been widely studied as an environmental restoration technology and energy production technology to solve the two crises of energy shortage and environmental pollution. Meanwhile, with the continuous research and improvement in photocatalysis technology, it has been found that the interaction between microorganisms and photocatalysts has good application prospects. In general, the interaction between photocatalysts and microorganisms can be summarized as follows: first of all, in terms of environmental pollution control, photocatalysts can damage microorganisms and sterilize them; secondly, in the production of energy materials, photocatalysts can couple with microorganisms to produce energy or degrade pollutants more efficiently; thirdly, in the preparation of photocatalysts, microorganisms can help the construction of photocatalysts. Although the relationship between microorganisms and photocatalysts is very important and significant, related reviews about this are rare. Therefore, in this paper, we have summarized the interaction between microorganisms and photocatalysts, the mechanism and application of photocatalysts in microorganism damage, and the mechanism and application of photocatalysts and microorganism synergism, and the preparation of photocatalysts by biological methods was also reviewed. Moreover, the problems and challenges that should be faced and addressed in future research are discussed. This journal is © The Royal Society of Chemistry.
语种：
英文
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MnO2 reduction by calcium lignosulfonate: the kinetics and mechanism studies
作者：
Wu, Fangfang;Deng, Jie;Kuang, Jiaqi;Xiao, Zhu;Liu, Hui;...
期刊：
Canadian Metallurgical Quarterly ,2020年59(1):78-84 ISSN：0008-4433
通讯作者：
Yu, Peng;Mi, Baobin
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, Peoples R China.;[Mi, Baobin] Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Peoples R China.
通讯机构：
[Yu, Peng; Mi, Baobin] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Peoples R China.
关键词：
adsorption;calcium lignosulfonate;internal diffusion;kinetic model;leaching;Manganese dioxide ore;reductive process mechanism;sulphuric acid
摘要：
The kinetics and mechanism of the reduction of manganese dioxide ore by calcium lignosulfonate (CLS) in acid solution were investigated. The results showed that the reducing process mainly occurred after the adsorption and then decomposition of CLS by ore and the concentration of sulphuric acid exerted an enhancing effect on both CLS adsorption and manganese extraction. The effects of leaching temperature, the mass ratio of CLS to MnO2 in ore, concentration of sulphuric acid as well as leaching time on per cent leached of Mn were also discussed. The experimental data were well interpreted with a shrinking core model of internal diffusion, and an overall kinetic model was established. The reaction rate constant was found to be proportional to the mass ratio of CLS to MnO2 in ore and concentration of sulphuric acid, and the apparent activation energy was determined to be 69.4 kJ mol−1 by using Arrhenius expression. © 2020, © 2020 Canadian Institute of Mining, Metallurgy and Petroleum.
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英文
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A review of public and environmental consequences of organic germanium
作者：
Zheng, Jiangfu;Yang, Lihua;Deng, Yaocheng* ;Zhang, Chenyu;Zhang, Yang;...
期刊：
Critical Reviews in Environmental Science and Technology ,2020年50(13):1384-1409 ISSN：1064-3389
通讯作者：
Deng, Yaocheng;Gong, Daoxin
作者机构：
[Zhang, Yang; Liao, Chanjuan; Deng, Yaocheng; Gong, Daoxin; Yang, Lihua; Xiong, Sheng; Zhang, Chenyu; Zhao, Jia; Gong, DX; Zheng, Jiangfu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Zhang, Yang; Liao, Chanjuan; Deng, Yaocheng; Gong, Daoxin; Yang, Lihua; Xiong, Sheng; Zhang, Chenyu; Zhao, Jia; Zheng, Jiangfu] Hunan Agr Univ, Inst Agr Environm Protect, Changsha, Hunan, Peoples R China.;[Ding, Chunxia] Hunan Agr Univ, Coll Sci, Changsha, Hunan, Peoples R China.
通讯机构：
[Deng, YC; Gong, DX] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.
关键词：
Environmental impact;environmental pollutants;organic germanium;recycling and removal technology;toxicity of heavy metal
摘要：
Germanium (Ge) is a widely distributed but rare element on earth. Organic germanium is the most widely used form of germanium. Compared to the common metal (mercury, cadmium, lead, etc.), organic germanium is much less toxic to humans than others. Since its discovery in 1886, organic germanium and relative compounds have caused many medically related problems across the globe. In most cases, organic germanium exists in the natural environment in an oxidation state. The size of organic germanium and its compounds is extremely small in natural water, for which organic germanium can easily enter the environment through the flow of water. Because organic germanium owns unique chemical properties and is potentially ecotoxic, so there are have special environmental problems. Considering the fact that people does not know much about organic germanium, along with the lack of systematic research, this paper starts with a brief introduction of the chemical composition, distribution, and threat to human health of organic germanium. Then, the new and common technologies for the recovery and removal of germanium as referred to in various literatures introduced and with detail description of their performance, advantages, disadvantages, and applications. It is of great significance for people to understand organic germanium and its pollution control. © 2019, © 2019 Taylor & Francis Group, LLC.
语种：
英文
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Iron-Catalyzed Cleavage Reaction of Keto Acids with Aliphatic Aldehydes for the Synthesis of Ketones and Ketone Esters
作者：
Zhou, Fangyuan;Li, Lesong;Lin, Kao;Zhang, Feng;Deng, Guo-Jun;...
期刊：
CHEMISTRY-A EUROPEAN JOURNAL ,2020年26(19):4246-4250 ISSN：0947-6539
通讯作者：
Gong, Hang
作者机构：
[Zhou, Fangyuan; Li, Lesong; Deng, Guo-Jun; Lin, Kao; Gong, Hang] Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat,Minist, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
通讯机构：
[Gong, Hang] X;Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat,Minist, Xiangtan 411105, Peoples R China.
关键词：
catalysis;decarbonylation;decarboxylation;cross-coupling;synthetic methods
摘要：
The radical–radical coupling reaction is an important synthetic strategy. In this study, the iron-catalyzed radical–radical cross-coupling reaction based on the decarboxylation of keto acids and decarbonylation of aliphatic aldehydes to obtain valuable aryl ketones is reported for the first time. Remarkably, when tertiary aldehydes were used as carbonyl sources, ketone esters were selectively obtained instead of ketones. The gram-scale preparation of aryl ketone through this strategy was easily achieved by using only 3 mol % of the iron catalyst. As a proof-of-concept, the bioactive molecule flurprimidol was synthesized in two steps by using this strategy. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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英文
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In situ synthesis of high-efficiency CsPbBr3/CsPb2Br5composite nanocrystals in aqueous solution of microemulsion
作者：
Lou, Sunqi;Zhou, Zhi* ;Gan, Weijiang;Xuan, Tongtong;Bao, Zhen;...
期刊：
Green Chemistry ,2020年22(16):5257-5261 ISSN：1463-9262
通讯作者：
Wang, Jing;Zhou, Zhi;Liu, Ru-Shi
作者机构：
[Gan, Weijiang; Cao, Luyu; Lou, Sunqi; Si, Shuaichen; Wang, Jing] Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Minist Educ,Key Lab Bioinorgan & Synthet Chem,Sta, Guangzhou 510275, Guangdong, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 10128, Hunan, Peoples R China.;[Xuan, Tongtong] Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China.;[Bao, Zhen; Liu, Ru-Shi] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan.;[Bao, Zhen; Liu, Ru-Shi] Natl Taiwan Univ, Adv Res Ctr Green Mat Sci & Technol, Taipei 106, Taiwan.
通讯机构：
[Wang, Jing] S;[Zhou, Zhi] H;[Liu, Ru-Shi] N;Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Minist Educ,Key Lab Bioinorgan & Synthet Chem,Sta, Guangzhou 510275, Guangdong, Peoples R China.;Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 10128, Hunan, Peoples R China.
摘要：
Here, we present the microemulsion method using sodium dodecylbenzenesulfonate and hydrofluoric acid for the in situ synthesis of brightly luminescent CsPbBr3/CsPb2Br5 composite nanocrystals (NCs) in aqueous solution. The obtained CsPbBr3/CsPb2Br5 composite NCs exhibit a photoluminescence quantum yield of 77.0% and a full width at half maximum of 16.0 nm. And solid-state back-lighting devices were fabricated by combining CsPbBr3/CsPb2Br5 composite NCs and red-emitting K2SiF6:Mn4+ phosphors with blue light. The as-fabricated device exhibits a wide color gamut of about 95.8% of the Rec. 2020. This work provides a green, low-cost, and in situ water-phase route to synthesize high-quality cesium lead halide NCs for their practical applications in solid-state back-lighting devices. This journal is © The Royal Society of Chemistry.
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英文
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Ultra-small 2D CoxZn2-x(benzimidazole)4 MOF nanosheets and their derived Co nanodots@Co-N-codoped graphene for efficient oxygen reduction reaction.
作者：
Zhao, Kuangmin;Liu, Suqin* ;Ye, Guanying;Wei, Xianli;Su, Yuke;...
期刊：
ChemSusChem ,2020年13(6):1556-1567 ISSN：1864-5631
通讯作者：
Liu, Suqin;He, Zhen
作者机构：
[Su, Yuke; Wei, Xianli; He, Zhen; Liu, Suqin; Ye, Guanying; Zhu, Weiwei; Zhao, Kuangmin] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Su, Yuke; Wei, Xianli; He, Zhen; Liu, Suqin; Ye, Guanying; Zhu, Weiwei; Zhao, Kuangmin] Cent S Univ, Hunan Prov Key Lab Chem Power Sources, Changsha 410083, Hunan, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Liu, SQ; He, Z] C;Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;Cent S Univ, Hunan Prov Key Lab Chem Power Sources, Changsha 410083, Hunan, Peoples R China.
关键词：
2D Materials;M-N-C;Metal-organic frameworks;Mg-air battery;electrocatalysis
摘要：
The development of nonprecious metal–nitrogen–carbon (M-N-C) materials with efficient metal utilization and abundant active sites for the oxygen reduction reaction (ORR) is of great significance for fuel cells and metal–air batteries. Ultrasmall 2 D CoxZn2−x(benzimidazole)4 [CoxZn2−x(bim)4] bimetallic metal–organic framework (MOF) nanosheets (≈2 nm thick) are synthesized by a novel bottom-up strategy and then thermally converted into a core–shell structure of sub-5 nm Co nanodots (NDs) wrapped with 2 to 5 layers of Co,N-codoped graphene (Co@FLG). The size of the Co NDs in Co@FLG could be precisely controlled by the Co/Zn ratio in the CoxZn2−x(bim)4 nanosheet. As an ORR electrocatalyst, the optimized Co@FLG exhibits an excellent half-wave potential of 0.841 V (vs. RHE), a high limiting current density of 6.42 mA cm−2, and great stability in alkaline electrolyte. Co@FLG also has great ORR performance in neutral electrolyte, as well as in Mg–air batteries. The experimental studies and DFT calculations reveal that the high performance of Co@FLG is mainly attributed to its great O2 absorptivity, which is endowed by the abundant Co−Nx and pyridinic-N in the FLG shell and the strong electron-donating ability from the Co ND core to the FLG shell. This elevates the eg orbital energy of CoII and lowers the activation energy for breaking the O=O/O−O bonds. This work sheds light on the design and fabrication of 2 D MOFs and MOF-derived M-N-C materials for energy storage and conversion applications. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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英文
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Good cycling stability and high initial efficiency demonstrated in full cells with limited lithium source for an advanced SnO2–Co–C composite anode
作者：
Wen, Gang;Liu, Hui;Liang, Tao;Ouyang, Yunpeng;Tan, Liang;...
期刊：
Electrochimica Acta ,2020年334:135640 ISSN：0013-4686
通讯作者：
Hu, Renzong
作者机构：
[Hu, Renzong; Zhu, Min; Wen, Gang; Liang, Tao; Tan, Liang; Liu, Jun] South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.;[Liu, Hui] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhang, Yao; Ouyang, Yunpeng] Sunwoda Elect Co Ltd, SUNWODA SCUT Joint Lab Adv Energy Storage Technol, Shenzhen 518107, Peoples R China.
通讯机构：
[Hu, Renzong] S;South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.
关键词：
Full cell performance;Tin oxide;Anode materials;Coulombic efficiency
摘要：
Despite there being many reports on SnO2-based anode materials, most of the electrode materials are tested in half cells using lithium metal with unlimited lithium-ion sources as the counter electrode, which may conceal the real properties of these composites to a certain extent. In this study, a ternary SnO2-Co-C composite was fabricated by a scalable ball milling strategy. The composite exhibited high initial Coulombic efficiency (ICE, > 80%), a large capacity (similar to 900 mA h g(-1)) and superior cycling stability (capacity retention more than 99% after 100 cycles) in half cells. Furthermore, coin-type full cells in which the ternary SnO2 -Co-C anodes were paired with different cathodes were demonstrated. A LiFePO4 vertical bar vertical bar SnO2-Co-C full cell tested at 0.5-3.4 V exhibited an ICE of 75.1% and an initial discharge capacity of 906 mA h g(-1), which were close to those of the SnO2-Co-CIILi half cells. By analyzing the cycling performance and characteristics of the charge/discharge process for the full cells with different capacity ratios of cathode/anode, it was confirmed that the capacity decay of the full cells was due to the continuous consumption of Li+ ions during cycling. Hence, the testing voltage windows were adjusted according to the lithiation/de-lithiation behavior of the SnO2. On this basis, the LiFePO4 vertical bar vertical bar SnO2-Co-C full cells tested at 2.3-3.4 V and the LiCoO2 vertical bar vertical bar SnO2-Co-C full cells tested at 2.60-3.75 V exhibited excellent cycling stability, demonstrating 80.3% and almost 100% capacity retention after 100 cycles, respectively, thereby laying a foundation for the practical application of advanced SnO2-based anodes in lithium-ion batteries. (C) 2020 Elsevier Ltd. All rights reserved.
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英文
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The clean preparation of multisubstituted pyrroles under metal- A nd solvent-free conditions
作者：
Gui, Qing-Wen;He, Xiaoli;Wang, Wenjing;Zhou, Huilin;Dong, Yumei;...
期刊：
Green Chemistry ,2020年22(1):118-122 ISSN：1463-9262
通讯作者：
He, Wei-Min
作者机构：
[Gui, Qing-Wen; Zhou, Huilin; Wang, Wenjing; Wang, Nengqing; He, Xiaoli; Dong, Yumei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Tang, Jia-Xi] Hunan Univ Sci & Technol, Sch Chem & Chem Engn, Xiangtan 411201, Peoples R China.;[He, Wei-Min; Cao, Zhong] Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410114, Hunan, Peoples R China.
通讯机构：
[He, Wei-Min] C;Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410114, Hunan, Peoples R China.
摘要：
A practical and sustainable protocol for the clean preparation of various multisubstituted pyrroles through an iodine-catalyzed multicomponent reaction under metal- A nd solvent-free conditions was developed. In the gram-scale synthesis, the desired pyrroles can be easily isolated in high-purity through simple extraction. © 2019 The Royal Society of Chemistry.
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英文
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Effect of Calcium-Based Catalysts on Pyrolysis Liquid Products from Municipal Sludge
作者：
Luo, Wei;Su, Yi-Feng;Hu, Qing;Yin, Huai-Lin;Wang, Shuo;...
期刊：
BioEnergy Research ,2020年13(3):887-895 ISSN：1939-1234
通讯作者：
Zhou, Zhi
作者机构：
[Wang, Shuo; Zhang, Wei; Wen, Xiao-Xi; Luo, Wei; Zhou, Nan; Zhou, Zhi; Su, Yi-Feng; Huang, Sheng-Xiong; Hu, Qing; Ao, Li-Jiao] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Yin, Huai-Lin; Luo, Wei; Zhou, Zhi; Huang, Sheng-Xiong] Hunan Kegu Environm Protect Technol Co Ltd, Changsha 410128, Peoples R China.
通讯机构：
[Zhou, Zhi] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;Hunan Kegu Environm Protect Technol Co Ltd, Changsha 410128, Peoples R China.
关键词：
Municipal sludge;Calcium-based;Catalytic pyrolysis;Liquid products
摘要：
Aimed to obtain high-quality pyrolysis liquid products, the effects of different calcium-based catalysts and temperatures on liquid products from catalytic pyrolysis of municipal sludge (moisture of 50%) were studied. Results showed that the liquid product yield reached maximum at 600°C and then decreased. The catalyst capability of catalysts decreased the yield of liquid products in the order of poorly soluble in water (Ca(OH)2, CaCO3, CaO) > soluble in water (CaCl2, Ca(H2PO4)2·H2O). High temperature strengthened the aromatization, and the breaking of the oxygen-containing functional group in liquid products resulted in the decrease of O/C and H/C molar ratios and the increase of four components yield in gaseous products. At 600°C, the catalysts significantly reduced the O content of liquid products and increased hydrocarbon content. Meantime, CaO additive increased the content of C to 85.34%, and the relative content of aromatics reached 83.99% at 800°C, which is suitable as chemical raw materials. However, the Ca(OH)2 group had the highest aliphatics content, and the H/C molar ratio was 1.42 at 400°C, which is suitable as fuel. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.
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英文
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Molecular dynamics simulation of cylindrically converging shock response in single crystal Cu
作者：
Tang, Fang;Jian, Zhiyong;Xiao, Shifang* ;Li, Xiaofan;Wang, Liang;...
期刊：
计算材料学(英文) ,2020年183:109845 ISSN：2057-3960
通讯作者：
Xiao, Shifang
作者机构：
[Xiao, Shifang; Deng, Huiqiu; Li, Xiaofan; Tang, Fang; Jian, Zhiyong] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.;[Wang, Liang] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Huang, Bowen; Hu, Wangyu] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Xiao, Shifang] H;Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.
关键词：
Cylindrical converging impact;Dislocation loops;Molecular dynamics simulation;Plasticity deformation;Temperature distribution
摘要：
There are tremendous experimental and simulation studies with regard to the shock response of copper, however, it is believed that the published literatures are seldom focused on response behavior of copper under nonplanar shock loading. Combined with the interaction between a potential wall and atoms, molecular dynamics simulation is performed to investigate the shock response of single crystal Cu under cylindrically converging impact, with the axis of a cylindrical potential wall along the [0 0 1] crystallographic orientation. The results show that affected by anisotropy of wave speed, the surface shape of elastic wavefront is transformed into a quadrangular columnar form from the initial cylindrical one. With the same shock velocity, due to the converging effect, the temperature rise under cylindrical impact is higher than that under planar impact, and the temperature distribution is very complex during shock. The sites for dislocation nucleation are dependent on shock velocity. At the shock velocity of 0.4 km/s, the nucleation and activity of Shockley partial dislocation loops occur in the hot spot regions adjacent to shock front along [1 0 0] and [0 1 0] directions. As shock velocity increases to 0.55 km/s, the shock plasticity starts from the free surface along [1 1 0] and [1–10] directions. © 2020 Elsevier B.V.
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英文
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Theoretical investigations of the aromaticity, stability and photophysical behaviors for expanded porphyrins
作者：
Wei, Wei;Li, Wei;Xia, Bao-Hui* ;Zhang, Hong-Xing;Bai, Fu-Quan*
期刊：
Chemical Physics Letters ,2019年728:25-31 ISSN：0009-2614
通讯作者：
Xia, Bao-Hui;Bai, Fu-Quan
作者机构：
[Xia, Bao-Hui; Bai, Fu-Quan; Wei, Wei; Zhang, Hong-Xing] Jilin Univ, Inst Theoret Chem, Lab Theoret & Computat Chem, Changchun 130012, Jilin, Peoples R China.;[Li, Wei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Bao-Hui] Jilin Univ, Coll Chem, Changchun 130023, Jilin, Peoples R China.
通讯机构：
[Xia, BH; Bai, FQ; Xia, Bao-Hui] J;Jilin Univ, Inst Theoret Chem, Lab Theoret & Computat Chem, Changchun 130012, Jilin, Peoples R China.;Jilin Univ, Coll Chem, Changchun 130023, Jilin, Peoples R China.
关键词：
Aromaticity;DFT;Expanded porphyrins;Photophysical behaviors;Stability
摘要：
We design a series of expanded porphyrins which are incorporated of dithienothiophene (DTT), 2,2′-bithiophene, inverted thiophene ring or selenophene ring and substituted of the pyrrole NH groups by S and Se heteroatoms. The molecule with 2,2′-bithiophene is more stable than the molecule with DTT. The expanded porphyrins with a thiophene or selenophene ring are more stable than the expanded porphyrins with an inverted thiophene or inverted selenophene ring. 6 shows special features due to its increased HOMO-LUMO gap, planar geometry, and strengthened aromaticity. We expect that this work can provide help to design and synthesize stable molecular materials. © 2019 Elsevier B.V.
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英文
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Synthesis of a MoS x -O-PtO x Electrocatalyst with High Hydrogen Evolution Activity Using a Sacrificial Counter-Electrode.
作者：
Zhan, Yingxin;Li, Yi;Yang, Zhi* ;Wu, Xiongwei;Ge, Mengzhan;...
期刊：
Advanced Science ,2019年6(5):1801663 ISSN：2198-3844
通讯作者：
Yang, Zhi;Nie, Huagui;Huang, Shaoming
作者机构：
[Nie, Huagui; Huang, Shaoming; Chen, Xi'an; Ge, Mengzhan; Li, Yi; Pang, Rongrong; Yang, Zhi; Hou, Junjie; Zhan, Yingxin; Zheng, Xiannuo; Nie, HG; Lai, Yuchong] Wenzhou Univ, Nanomat & Chem Key Lab, Wenzhou 325027, Peoples R China.;[Wu, Xiongwei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Huang, Shaoming; Zhou, Xuemei] Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Guangdong, Peoples R China.;[Duan, Huan] Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China.
通讯机构：
[Yang, Z; Nie, HG; Huang, SM] W;[Huang, Shaoming] G;Wenzhou Univ, Nanomat & Chem Key Lab, Wenzhou 325027, Peoples R China.;Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Guangdong, Peoples R China.
关键词：
MoSx;O substitution;PtOx;hydrogen evolution reaction;sacrificial-counter-electrodes
摘要：
Water splitting is considered to be a very promising alternative to greenly produce hydrogen, and the key to optimizing this process is the development of suitable electrocatalysts. Here, a sacrificial-counter-electrode method to synthesize a MoS x /carbon nanotubes/Pt catalyst (0.55 wt% Pt loading) is developed, which exhibits a low overpotential of 25 mV at a current density of 10 mA cm −2 , a low Tafel slope of 27 mV dec −1 , and excellent stability under acidic conditions. The theory calculations and experimental results confirm the high hydrogen evolution activity that is likely due to the fact that the S atoms in MoS x can be substituted with O atoms during a potential cycling process when using Pt as a counter-electrode, where the O atoms act as bridges between the catalytic PtO x particles and the MoS x support to generate a MoS x –O–PtO x structure, allowing the Pt atoms to donate more electrons thus facilitating the hydrogen evolution reaction process. © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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英文
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Polyoxometalate-coupled graphene nanohybrid via gemini surfactants and its electrocatalytic property for nitrite
作者：
Chen, Shu;Xiang, Yuanfang;Banks, M. Katherine;Xu, Weijian;Peng, Chang* ;...
期刊：
Applied Surface Science ,2019年466:110-118 ISSN：0169-4332
通讯作者：
Peng, Chang;Wu, Ruoxi
作者机构：
[Xu, Weijian; Peng, C; Wu, Ruoxi; Peng, Chang; Chen, Shu; Xiang, Yuanfang] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Peng, Chang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Banks, M. Katherine; Wu, Ruoxi] Texas A&M Univ, Zachry Dept Civil Engn, College Stn, TX 77843 USA.
通讯机构：
[Peng, C; Wu, RX] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Catalyst;Gemini surfactants;Graphene;Polyoxometalate;Stabilizers
摘要：
A novel graphene oxide (GO)-polyoxometalate (POM) nanohybrid is prepared using gemini surfactants (Gem) as stabilizers for the first time. The electrostatic interactions, chemical structure, and morphology of this Gem-GO-POM nanohybrid are systematically characterized, which have been manifested that the Gem-GO-POM nanohybrid provides uniform distribution of POM nanoparticles on the GO nanosheets and exhibits excellent electrochemical activity and stability due to the use of Gem as linkers and stabilizers. The prepared Gem-GO-POM catalyst used as electrode displays an enhanced electro-oxidation of nitrite compared with pure GO and DTAB-GO-POM hybrid using dodecyl trimethyl ammonium bromide (DTAB) as stabilizers. The proposed nanohybrid structure capitalizes on the enhancing in the oxidation reactions ability of the POM through the Gem linkers to provide more binding sites for POM on the surface of GO. © 2018
语种：
英文
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Unveiling the Role of Heteroatom Gradient-Distributed Carbon Fibers for Vanadium Redox Flow Batteries with Long Service Life
作者：
Wu, Xiong-Wei;Deng, Qi* ;Peng, Chang;Zeng, Xian-Xiang;Wu, An-Jun;...
期刊：
ACS Applied Materials & Interfaces ,2019年11(12):11451-11458 ISSN：1944-8244
通讯作者：
Deng, Qi;Lu, Xiang-Yang;Guo, Yu-Guo
作者机构：
[Wu, An-Jun; Ma, Qiang; Wu, Xiong-Wei; Peng, Chang; Deng, Q; Lu, Xiang-Yang; Deng, Qi; Zeng, Xian-Xiang; Zhou, Chun-Jiao] Hunan Agr Univ, Coll Sci, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;[Yin, Ya-Xia; Guo, Yu-Guo] Chinese Acad Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, CAS Res Educ Ctr Excellence Mol Sci,BNLMS, Beijing 100190, Peoples R China.;[Yin, Ya-Xia; Guo, Yu-Guo] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
通讯机构：
[Deng, Q; Lu, XY] H;[Guo, Yu-Guo] C;[Guo, Yu-Guo] U;Hunan Agr Univ, Coll Sci, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;Chinese Acad Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, CAS Res Educ Ctr Excellence Mol Sci,BNLMS, Beijing 100190, Peoples R China.
关键词：
vanadium redox flow batteries;electrocatalysis;carbon fibers;heteroatoms gradient distribution;long service life
摘要：
The fundamental understanding of electrocatalytic reaction process is anticipated to guide electrode upgradation and acquirement of high-performance vanadium redox flow batteries (VRFBs). Herein, a carbon fiber prototype system with a heteroatom gradient distribution has been developed with enlarged interlayer spacing and a high graphitization that improve the electronic conductivity and accelerate the electrocatalytic reaction, and the mechanism by which gradient-distributed heteroatoms enhance vanadium redox reactions was elucidated with the assistance of density functional theory calculations. All these contributions endow the obtained electrode prominent redox reversibility and durability with only 1.7% decay in energy efficiency over 1000 cycles at 150 mA cm -2 in the VRFBs. Our work sheds light on the significance of elaborated electrode design and impels the in-depth investigation of VRFBs with long service life. © 2019 American Chemical Society.
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英文
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