Phosphorus and oxygen co-doped composite electrode with hierarchical electronic and ionic mixed conducting networks for vanadium redox flow batteries
作者：
Ling, Wei;Wang, Zhi-An;Ma, Qiang;Deng, Qi;Tang, Jian-Feng;...
期刊：
Chemical Communications ,2019年55(77):11515-11518 ISSN：1359-7345
通讯作者：
Wu, Xiong-Wei;Yue, Jun-Pei;Guo, Yu-Guo
作者机构：
[Ma, Qiang; Deng, Lei; Wu, Xiong-Wei; Tang, Jian-Feng; Ling, Wei; Deng, Qi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wang, Zhi-An] Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Zhu, Liang-Hong] Shenzhen Polytech, Automot & Transportat Engn, Shenzhen 518055, Guangdong, Peoples R China.;[Yue, Jun-Pei; Guo, Yu-Guo] Chinese Acad Sci, CAS Key Lab Mol Nanostruct & Nanotechnol, Inst Chem, Beijing 100190, Peoples R China.
通讯机构：
[Wu, Xiong-Wei] H;[Yue, JP; Guo, YG] C;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Chinese Acad Sci, CAS Key Lab Mol Nanostruct & Nanotechnol, Inst Chem, Beijing 100190, Peoples R China.
摘要：
The hierarchical electronic and ionic mixed conducting networks build in graphite felt electrodes possess excellent electrocatalytic activity and faster electronic and ionic conduction, resulting in an enhanced energy efficiency of vanadium redox flow batteries with durable life for 1000 cycles and a high discharge capacity of 10.1 A h L-1 at a current density of 350 mA cm-2. This journal is © The Royal Society of Chemistry.
语种：
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.
语种：
英文
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Photocontrolled self-assembly of silica nanoparticles
作者：
Peng, Chang;Zeng, Tianqin;Yu, Yong;Li, Zefan;Zuo, Jiangtao;...
期刊：
Ceramics International ,2019年45(7):9320-9324 ISSN：0272-8842
通讯作者：
Li, Ling
作者机构：
[Peng, Chang; Li, Ling; Kuai, Zeyuan; Jin, Yang; Wang, Yehe; Li, Zefan; Yu, Yong; Zuo, Jiangtao; Zeng, Tianqin] Hunan Agr Univ, Coll Sci, Changsha 410082, Hunan, Peoples R China.;[Peng, Chang] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.
通讯机构：
[Li, Ling] H;Hunan Agr Univ, Coll Sci, Changsha 410082, Hunan, Peoples R China.
关键词：
Light controlled self-assembly;Morphological patterns;Reversible photoresponse
摘要：
Herein we present a novel light-controlled assembly system, which is fabricated by functionalizing silica nanoparticles with coumarin. This system exhibits reversible morphological changes under alternating irradiation with 365 nm and 254 nm light: scattered distribution pattern, firework-shaped pattern, honeycomb pattern and donut-like pattern, due to the reversible photodimerization and photocleavage of coumarin. Furthermore, this system displays reversibly controllable wettability, which can be transformed between hydrophobic and superhydrophobic upon UV light illumination based on the photoresponsive of coumarin as well. The system with these interesting characteristics provides potential applications in the synthesis of controllable nanostructures by photo-regulation and self-cleaning fields. © 2019
语种：
英文
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Enhancing photoluminescence properties of Mn4+-activated Sr4-xBaxAl14O25 red phosphors for plant cultivation LEDs
作者：
Wu, Xianbo;Yang, Yimei;Gai, Shujie;Liu, Longhai;Zhou, Zhipeng;...
期刊：
Journal of the American Ceramic Society ,2019年102(12):7386-7396 ISSN：0002-7820
通讯作者：
Zhou, Nan;Zhou, Zhi
作者机构：
[Xia, Mao; Zhou, Zhipeng; Yang, Yimei; Gai, Shujie; Zhong, Yuan; Zhou, Nan; Zhou, Zhi; Wu, Xianbo; Liu, Longhai; Li, Minghui] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhou, Zhipeng; Yang, Yimei; Gai, Shujie; Zhong, Yuan; Wu, Xianbo; Zhou, Nan; Zhou, Zhi; Liu, Longhai; Li, Minghui] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, 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：
LED;luminescence;phosphors;plant cultivation;Sr4Al14O25:Mn4+
摘要：
Non-rare earth Mn4+-activated strontium aluminate phosphor is considered to be a promising material for plant cultivation field owing to their advantage of inexpensively, environment friendly, nontoxic, and appropriate spectral range. In this paper, a Sr4-xBaxAl13.99O25:0.01Mn(4+),1.4H(3)BO(3) strontium aluminate phosphor is synthesized by a convenient high-temperature solid-state reaction. The photoluminescence spectra located at red region with a peak at 655 nm in the range of 600 to 750 nm that can be excited under the excitation of ultraviolet (similar to 346 nm) or blue light (similar to 450 nm). The shape emission band at 655 nm is attributed to the transition of E-2(g)-(4)A(2g). Furthermore, the emission intensity of Sr4-xBaxAl13.99O25: 0.01Mn(4+),1.4H(3)BO(3) phosphor is conducted in detail with the variety of Ba2+ doping concentration and the intensity can be enhanced to 140.9% than the Sr4Al13.99O25:0.01Mn(4+),1.4H(3)BO(3) when the value of Ba2+ concentration equal to 0.1 mol. In addition, the X-ray diffraction spectra, element mapping, composition modifying, optical properties, FT-IR spectra, diffuse reflectance spectra, thermal stability, and fluorescence lifetime are systematically investigated. According to the electro-luminescent spectra of as-packaged LED, indicating that the Sr3.9Ba0.1Al13.99O25:0.01Mn(4+),1.4H(3)BO(3) phosphor will become a great candidate for plant cultivation LEDs due to the emission spectra match well the plant pigment spectrum.
语种：
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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MoS2-Catalyzed transamidation reaction
作者：
Zhang, Feng* ;Li, Lesong;Ma, Juan;Gong, Hang*
期刊：
Scientific Reports ,2019年9(1):2536 ISSN：2045-2322
通讯作者：
Zhang, Feng;Gong, Hang
作者机构：
[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, Lesong; Ma, Juan; Gong, Hang] Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.
通讯机构：
[Zhang, Feng] H;[Gong, Hang] X;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.
摘要：
The MoS2-catalyzed transamidation reaction with high yields using N,N-dimethylformamide and other amides as carbonyl sources is developed here. The protocol is simple, does not require any additive such as acid, base, ligand, etc., and encompasses a broad substrate scope for primary, secondary and heterocyclic amines. Moreover, the acetylation and propanylation of amines also can be achieved with good to excellent yield by this strategy.
语种：
英文
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Recent advances in nanostructured electrode-electrolyte design for safe and next-generation electrochemical energy storage
作者：
Zeng, X-X;Xu, Y-T;Yin, Y-X;Wu, X-W* ;Yue, J.* ;...
期刊：
Materials Today Nano ,2019年8:100057 ISSN：2588-8420
通讯作者：
Wu, X-W;Yue, J.;Guo, Y-G
作者机构：
[Wu, X-W; Xu, Y-T; Zeng, X-X] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Yue, J.; Yin, Y-X; Guo, Y-G] Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, CAS Key Lab Mol Nanostruct & Nanotechnol, Inst Chem,Beijing Natl Lab Mol Sci BNLMS, Beijing 100190, Peoples R China.;[Yin, Y-X; Guo, Y-G] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Wu, X-W] Cent South Univ, XiangYa Sch Publ Hlth, Changsha 410078, Hunan, Peoples R China.
通讯机构：
[Wu, X-W] H;[Yue, J; Guo, YG; Wu, X-W] C;[Guo, Y-G] U;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, CAS Key Lab Mol Nanostruct & Nanotechnol, Inst Chem,Beijing Natl Lab Mol Sci BNLMS, Beijing 100190, Peoples R China.
关键词：
Electrochemical energy storage;Energy density;Nanomaterials;Power;Safety;Structure design
摘要：
The pursuit for high-efficiency energy utilization stimulates for rapid development of electrochemical storage techniques. While the energy density demand is elevated, the safety consideration has stepped onto a new height. Hence, these two aspects gain much attention in the evolution of electrochemical energy storage. Correspondingly, the electrodes and electrolytes need special design to achieve the set target. This review first collects recent progress in nanostructured electrode-electrolyte with tailored design, including specific attention on alkali metal batteries, redox flow batteries, and supercapacitors. The electrode materials along with advanced electrolytes can endow these electrochemical energy storage apparatuses with high energy or power density, long lifetime, and high safety insurance. Moreover, the particular focus is dedicated to practical concerns for these electrodes, electrolytes, and their interfaces, including the thermal behavior and charging/discharging changing of an electrode, electrolyte selection and optimization, and electrode-electrolyte interface construction. Eventually, the general guideline and direction of endeavor to break the current limitation are presented for advanced electrochemical energy storage in the future. © 2019 Elsevier Ltd
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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Influence of Defects on Excited-State Dynamics in Lead Halide Perovskites: Time-Domain ab Initio Studies
作者：
Li, Wei* ;Long, Run* ;Tang, Jianfeng* ;Prezhdo, Oleg V.*
期刊：
Journal of Physical Chemistry Letters ,2019年10(13):3788-3804 ISSN：1948-7185
通讯作者：
Li, Wei;Tang, Jianfeng;Long, Run;Prezhdo, Oleg V.
作者机构：
[Tang, Jianfeng; Li, Wei; Li, W] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Long, Run] Beijing Normal Univ, Minist Educ, Key Lab Theoret & Computat Photochem, Coll Chem, Beijing 100875, Peoples R China.;[Prezhdo, Oleg V.] Univ Southern Calif, Dept Chem, Los Angeles, CA 90089 USA.
通讯机构：
[Li, W; Tang, JF] H;[Long, Run] B;[Prezhdo, Oleg V.] U;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Beijing Normal Univ, Minist Educ, Key Lab Theoret & Computat Photochem, Coll Chem, Beijing 100875, Peoples R China.
摘要：
This Perspective summarizes recent research into the excited-state dynamics in lead halide perovskites that are of paramount importance for photovoltaic and photocatalytic applications. Nonadiabatic molecular dynamics combined with time-domain ab initio density functional theory allows one to mimic time-resolved spectroscopy experiments at the atomistic level of detail. The focus is placed on realistic aspects of perovskite materials, including point defects, surfaces, grain boundaries, mixed stoichiometries, dopants, and interfaces. The atomistic description of the quantum dynamics of electron and hole trapping and recombination, provided by the time-domain ab initio simulations, generates important insights into the mechanisms of charge and energy losses and guides the development of high-performance perovskite solar cell devices.
语种：
英文
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Ultrasound accelerated synthesis of O-alkylated hydroximides under solvent- and metal-free conditions
作者：
Jiang, Hongmei;Tang, Xiaoyue;Liu, Sihan;Wang, Lian;Shen, Haicheng;...
期刊：
Organic & Biomolecular Chemistry ,2019年17(48):10223-10227 ISSN：1477-0520
通讯作者：
Gui, Qing-Wen
作者机构：
[Wang, Lian; Yang, Jiankui; Shen, Haicheng; Gui, Qing-Wen; Liu, Sihan; Wang, Huixian; Jiang, Hongmei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Jiang, Hongmei] Hunan Univ, Coll Chem Engn, State Key Lab ChemoBiosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Tang, Xiaoyue] South China Univ Technol, Sch Chem & Chem Engn, Dept Pharmaceut Engn, Guangzhou 510640, Guangdong, Peoples R China.
通讯机构：
[Gui, Qing-Wen] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
摘要：
A novel, sustainable, environmentally friendly, high substrate scope, efficient, solvent-free and metal catalyst-free method for the cross-dehydrogenative coupling (CDC) reaction between N-hydroxyphthalimide (NHPI) and benzyl/ether compounds is described. This coupling reaction proceeds through ultrasound acceleration. Compared to conventional heating conditions, the use of ultrasound techniques not only improves the reaction efficiency and enhances the reaction rate but also minimizes the side reactions.
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.
语种：
英文
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Macrodeformation twinning in a textured aluminum alloy via dynamic equal channel angular pressing
作者：
Qi, D. K.;Tang, M. X.;Lu, L.* ;Zhao, F.;Wang, L.* ;...
期刊：
Journal of Materials Science ,2019年54(5):4314-4324 ISSN：0022-2461
通讯作者：
Lu, L.;Wang, L.
作者机构：
[Luo, S. N.; Lu, L.; Qi, D. K.] Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China.;[Luo, S. N.; Zhao, F.; Tang, M. X.; Lu, L.; Qi, D. K.] Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China.;[Wang, L.] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Lu, L.] S;[Lu, L.] P;[Wang, L.] H;Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China.;Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China.
关键词：
Equal Channel Angular Pressing;Deformation Twins;Stacking Fault Energies (SFE);Electron Back-scattered Diffraction (EBSD);Longer Grain
摘要：
Dynamic equal channel angular pressing experiments are conducted on an aluminum alloy with impact directions (ID) parallel to the rolling direction (RD), transverse direction (TD) and normal direction (ND), referred to as the ID
$$\parallel $$
RD, ID
$$\parallel $$
TD and ID
$$\parallel $$
ND loading, respectively. Anisotropic deformation twinning is observed as a result of texture and grain elongation along RD, and the deformation twins can be activated both at grain boundaries and within grain interiors. Large-sized deformation twins (tens of
$$\mu $$
m long) form in the ID
$$\parallel $$
RD sample, while few twins are observed in the ID
$$\parallel $$
TD and ID
$$\parallel $$
ND samples during rapid severe plastic deformation. Molecular dynamics simulations are conducted to explain the effects of crystallographic orientations and grain geometry on deformation twinning. The resolved shear stress analysis shows that deformation twinning is easier to occur when the impact direction is along [001] and [110] than [111], and a larger grain dimension along the impact direction leads to a bigger twin size.
语种：
英文
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Variations of Cadmium Accumulation and Translocation in Different Pakchoi Cultivars and Screening for Cd-Pollution-Safe Cultivars Using Cluster Analysis
作者：
Liu, Biqiong;Wu, Fangfang;Dai, Xiongze;Liu, Feng* ;Mi, Baobin*
期刊：
POLISH JOURNAL OF ENVIRONMENTAL STUDIES ,2019年28(4):2215-2221 ISSN：1230-1485
通讯作者：
Liu, Feng;Mi, Baobin
作者机构：
[Liu, Biqiong] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Hunan, Peoples R China.;[Wu, Fangfang] Hunan Agr Univ, Coll Sci, Changsha, Hunan, Peoples R China.;[Dai, Xiongze; Mi, Baobin; Liu, Feng] Hunan Acad Agr Sci, Res Inst Vegetables, Changsha, Hunan, Peoples R China.;[Dai, Xiongze; Mi, Baobin; Liu, Feng] Hunan Acad Agr Sci, Changsha, Hunan, Peoples R China.
通讯机构：
[Liu, F; Mi, BB] H;Hunan Acad Agr Sci, Res Inst Vegetables, Changsha, Hunan, Peoples R China.;Hunan Acad Agr Sci, Changsha, Hunan, Peoples R China.
关键词：
cadmium;pollution-safe cultivar;pakchoi;cluster analysis
摘要：
Screening and breeding of pollution-safe cultivars (PSCs) has become one of the most direct and cost-effective methods for reducing the health risks of heavy metal-contaminated soil. In this paper we identified and screened out cadmium (Cd)-pollution-safe pakchoi cultivars from 30 pakchoi genetype materials through preliminary screening experiments and re-screening experiments in field conditions. We found that in preliminary screening experiments, the Cd uptake displayed significant variability among the 30 selected pakchoi cultivaters grown in soil with a Cd concentration of 0.51 mg/kg. 11 out of the 30 pakchoi cultivars belonged to the low-Cd accumulated cluster classified by cluster analysis, which had the potential to be Cd-PSCs. The re-screening experiments under different Cd levels of contaminated soils in combination with the studies of the enrichment factors (EFs) and translocation factors (TFs) further confirmed the consistency and genotypic stability of the low-Cd accumulating traits of the potential Cd-PSCs. This study proves the feasibility of applying cluster analysis in the process of identifying PSCs. © 2019, HARD Publishing Company. All rights reserved.
语种：
英文
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Transition-metal-free selective pyrimidines and pyridines formation from aromatic ketones, aldehydes and ammonium salts
作者：
Chen, Jinjin;Meng, Huanxin;Zhang, Feng* ;Xiao, Fuhong;Deng, Guo-Jun*
期刊：
Green Chemistry ,2019年21(19):5201-5206 ISSN：1463-9262
通讯作者：
Zhang, Feng;Deng, Guo-Jun
作者机构：
[Zhang, Feng; Deng, GJ; Meng, Huanxin; Chen, Jinjin; Deng, Guo-Jun; Xiao, Fuhong] Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environmentally Friendly Chem & Applicat, Minist Educ,Coll Chem, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhang, F; Deng, GJ] X;[Zhang, Feng] H;Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environmentally Friendly Chem & Applicat, Minist Educ,Coll Chem, Xiangtan 411105, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
摘要：
An efficient synthesis of pyrimidines and pyridines has been developed from readily available aromatic ketones, aldehydes and ammonium salts under transition-metal-free conditions. In this strategy, ammonium salts were used as nitrogen sources and only water was generated as a nontoxic byproduct. A catalytic amount of NaIO4 played an important role in the selectivity control, whereas substituted pyridines were dominantly formed in its absence. © 2019 The Royal Society of Chemistry.
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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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Improving the electrochemical properties of a SiO@C/graphite composite anode for high-energy lithium-ion batteries by adding lithium fluoride
作者：
Xia, Mao;Li, Yi-ran;Wu, Yu-fan;Zhang, Hong-bo;Yang, Jian-kui;...
期刊：
Applied Surface Science ,2019年480:410-418 ISSN：0169-4332
通讯作者：
Xiong, Xiang;Zhou, Zhi
作者机构：
[Xia, Mao; Xiong, Xiang; Zhang, Hong-bo] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.;[Li, Yi-ran; Yang, Jian-kui; Wu, Yu-fan; Zhou, Nan; Zhou, Zhi] 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：
[Xiong, Xiang] C;[Zhou, Zhi] H;Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.;Hunan Agr Univ, Coll Sci, Hunan Prov Engn Technol Res Ctr Opt Agr, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.
关键词：
Chemical vapor deposition;Lithium fluoride modification;Lithium-ion batteries;Solid electrolyte interphase film;[email protected]/graphite
摘要：
Silicon monoxide has attracted wide interest as a negative material for lithium-ion batteries because of its high theoretical capacity. Moreover, in this paper, lithium fluoride serves as an additive, which can improve the initial coulombic efficiency of silicon monoxide-based electrodes. This work develops a simple two-step method to prepare a lithium fluoride-modified [email protected]/graphite composite as an anode for lithium-ion batteries. First, [email protected] is prepared via a chemical vapor deposition method; then, [email protected]/graphite-LiF is obtained by mixing [email protected], graphite and LiF in a stirrer. The phase composition, particle appearance and electrochemical properties of the [email protected]/graphite-LiF composites are characterized via X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge and discharge analyses. The [email protected]/graphite-7.5% LiF composite shows a high capacity retention rate of over 91% after 100 cycles. The capacity of [email protected]/graphite-LiF is close to 200 mAh g −1 at 3.2 A g −1 , which is much higher than that of [email protected]/graphite (only 21 mAh g −1 ). This result is mainly because Li ion transport is improved during the lithiation/delithiation process and stabilizes the solid electrolyte interface layer due to lithium fluoride addition. The encouraging results suggest that adding lithium fluoride to SiO-based materials is an effective strategy to improve the electrochemical properties and can be applied to high-energy storage systems. © 2019 Elsevier B.V.
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A three-component approach to isoxazolines and isoxazoles under metal-free conditions
作者：
Wang, Dahan;Zhang, Feng;Xiao, Fuhong* ;Deng, Guo-Jun*
期刊：
Organic & Biomolecular Chemistry ,2019年17(41):9163-9168 ISSN：1477-0520
通讯作者：
Xiao, Fuhong;Deng, Guo-Jun
作者机构：
[Wang, Dahan; Xiao, Fuhong; Deng, GJ; Deng, Guo-Jun] Xiangtan Univ, Coll Chem, Key Lab Environm Friendly Chem & Applicat, Minist Educ,Key Lab Green Organ Synth & Applicat, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Xiao, FH; Deng, GJ] X;Xiangtan Univ, Coll Chem, Key Lab Environm Friendly Chem & Applicat, Minist Educ,Key Lab Green Organ Synth & Applicat, Xiangtan 411105, Peoples R China.
摘要：
A 1,3-dipolar cycloaddition of 2-methylquinoline, tert-butyl nitrite (TBN) and alkynes or alkenes for the synthesis of biheteroaryls containing both isoxazoline/isoxazole and quinoline motifs has been developed. In this protocol, TBN serves as a convenient N-O source to convert 2-methylquinoline into intermediate nitrile oxides in situ.
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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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A novel near-infrared fluorescent probe with a "donor--acceptor" type structure and its application in the selective detection of cysteine in living cells
作者：
Hong, Haojia;Shi, Lei* ;Huang, Junzhe;Peng, Chang* ;Yang, Sheng;...
期刊：
NEW JOURNAL OF CHEMISTRY ,2019年43(1):72-76 ISSN：1144-0546
通讯作者：
Shi, Lei;Gong, Shengzhao;Peng, Chang
作者机构：
[Gong, Shengzhao; Hong, Haojia; Shi, Lei; Huang, Junzhe] Guangdong Ind Polytech, Sch Chem Engn & Technol, Guangzhou 510300, Guangdong, Peoples R China.;[Peng, Chang] Hunan Agr Univ, Coll Sci, Changsha 411105, Hunan, Peoples R China.;[Yang, Sheng] Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410114, Hunan, Peoples R China.;[Shao, Guang] Sun Yat Sen Univ, Sch Chem, Guangzhou 510275, Guangdong, Peoples R China.
通讯机构：
[Shi, L; Gong, SZ] G;[Peng, Chang] H;Guangdong Ind Polytech, Sch Chem Engn & Technol, Guangzhou 510300, Guangdong, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 411105, Hunan, Peoples R China.
摘要：
The development of imaging-suitable fluorescent probes based on fluorogen scaffolds with near-infrared emission is crucial for monitoring cysteine (Cys) in biological systems. Herein, we synthesized a novel NIR dye based on a donor--acceptor structure which exhibits good Stokes shifts, satisfactory quantum yields, long wavelength excitation and excellent photostability, and a Cys-responsive NIR probe was constructed by decoration with methacrylate. The designed probe possesses great sensitivity and selectivity for detection of Cys. Moreover, it has been successfully applied in detecting Cys in living cells, indicating its great potential value for biological applications.
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A novel MnO 2 /MXene composite prepared by electrostatic self-assembly and its use as an electrode for enhanced supercapacitive performance
作者：
Chen, Shu;Xiang, Yuanfang;Xu, Weijian* ;Peng, Chang*
期刊：
无机化学前沿 ,2019年6(1):199-208 ISSN：2052-1553
通讯作者：
Xu, Weijian;Peng, Chang
作者机构：
[Xu, WJ; Peng, C; Xu, Weijian; 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.
通讯机构：
[Xu, WJ; Peng, C; Peng, Chang] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
摘要：
MXene is a new 2D transition metal carbide possessing metallic conductivity and hydrophilic surfaces. It has drawn widespread attention as a potential material for electrode use. However, the applications of MXene are limited by its property of low electrical capacity. In this paper, a novel MnO 2 /MXene composite is prepared by electrostatic self-assembly. Firstly, delaminated MnO 2 nanosheets are obtained through the intercalation delamination of multilayered H-MnO 2 in a cationic Gemini surfactant (Gem) solution, leading to a positively charged surface. Then, the positive MnO 2 nanosheets are assembled on negative MXene nanosheets through electrostatic self-assembly to form a MnO 2 /MXene composite. The characterization results show that the MnO 2 nanosheets are intimately assembled on the MXene nanosheets. As an electrode material, the MnO 2 /MXene composite displays a specific capacitance of 340 F g -1 at 1 A g -1 , which is three times the performance of an MXene electrode. In addition, the MnO 2 /MXene electrode shows a high retention rate (90.3% retention at 10 A g -1 ) and good cycling life (87.6% of the initial specific capacitance is retained after 2000 cycles at 4 A g -1 ). The properties of the proposed composite are attributed to the excellent conductivity of MXene and the high specific capacitance of MnO 2 . © 2019 the Partner Organisations.
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