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.
语种：
英文
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微信辅助BOPPPS教学模型在有机化学课程教学中的应用研究
作者：
李霞;文志勇;李宇;张薇;董新容
期刊：
科技经济导刊 ,2019年(24):112-113 ISSN：2096-1995
作者机构：
湖南农业大学理学院
关键词：
BOPPPS教学模型;微信;有机化学课程
摘要：
以湖南农业大学"有机化学"课程为例,分析传统教学在新教学模式下存在的问题,结合BOPPPS教学模型,进行微信辅助有机化学课程教学方面的研究。
语种：
中文
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A new member of the CoO structure family: Hexagonal prisms CoO assembled on reduced graphene oxide for high-performance lithium-ion storage capacity
作者：
Bao, Lin;He, Yikuan;Peng, Chang;Li, Yan* ;Ou, Encai* ;...
期刊：
Materials Letters ,2019年235(Jan.15):88-91 ISSN：0167-577X
通讯作者：
Li, Yan;Ou, Encai;Xu, Weijian
作者机构：
[Bao, Lin; Li, Yan] Northwest Univ, Coll Chem & Mat Sci, Energy & Catalysis Hub, Minist Educ,Key Lab Synthet & Nat Funct Mol Chem, Xian 710127, Shaanxi, Peoples R China.;[Xu, Weijian; He, Yikuan; Ou, Encai; Xu, WJ] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemobiosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Peng, Chang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Li, Yan] N;[Ou, EC; Xu, WJ] H;Northwest Univ, Coll Chem & Mat Sci, Energy & Catalysis Hub, Minist Educ,Key Lab Synthet & Nat Funct Mol Chem, Xian 710127, Shaanxi, Peoples R China.;Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemobiosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.
关键词：
Anodes;Cobalt compounds;Electrochemistry;Graphene;Ions;Prisms;Sol-gel process;Sol-gels;Cobalt oxides;Electrochemical test;Hexagonal morphology;Hexagonal prism;Lithium ion storages;Modified sol-gel method;Pure phase;Reduced graphene oxides;Lithium-ion batteries
摘要：
In this research, we use a modified sol-gel method to obtain a pure phase new hexagonal CoO on reduced graphene oxide by leading of polar solvent. In the electrochemical test, the CoO/rGO composite shows a remarkable performance of capacity as an anode of a lithium ion battery. The electrochemistry performance shows that the capacity of the composite can remain at 1300 mAh/g in 100 cycles without damping. The pure phase of CoO and its hexagonal morphology have been characterized by XRD, SEM and TEM. (C) 2018 Elsevier B.V. All rights reserved.
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 SiO@C composite through low cost micron-scale SiO powders as raw material no further grinding. The SiO@C 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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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.
语种：
英文
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E-Selective synthesis of vinyl sulfones via silver-catalyzed sulfonylation of styrenes
作者：
Gui, Qingwen;Han, Kang;Liu, Zhuoliang;Su, Zhaohong;He, Xiaoli;...
期刊：
Organic & Biomolecular Chemistry ,2018年16(32):5748-5751 ISSN：1477-0520
通讯作者：
Jiang, Hongmei;Li, Yangyan
作者机构：
[Han, Kang; Su, Zhaohong; Tian, Bufan; Gui, Qingwen; Jiang, Hongmei; He, Xiaoli] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Liu, Zhuoliang] Natl Univ Def Technol, Coll Liberal Arts & Sci, Changsha 410073, Hunan, Peoples R China.;[Li, Yangyan] Hunan Univ Sci & Engn, Coll Chem & Bioengn, Yongzhou 425199, Peoples R China.
通讯机构：
[Jiang, Hongmei; Li, Yangyan] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Univ Sci & Engn, Coll Chem & Bioengn, Yongzhou 425199, Peoples R China.
关键词：
Chemical bonds;Silver;Styrene;Bond coupling;Selective synthesis;SIMPLE protocol;Sulfonylation;Vinyl sulfones;Catalysis
摘要：
An efficient and highly E-selective protocol for the synthesis of vinyl sulfones is described. This simple protocol demonstrates the first synthesis of vinyl sulfones via a silver-catalyzed C-S bond coupling reaction. In addition, the success of the reaction was found to be critically dependent on the use of TEMPO as the additive. © 2018 The Royal Society of Chemistry.
语种：
英文
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Investigation of the interstitial oxygen behaviors in vanadium alloy: A first-principles study
作者：
Zhang, Xingming;Li, Yifan;He, Qiaoling;Li, Ruilian* ;Deng, Lei;...
期刊：
Current Applied Physics ,2018年18(2):183-190 ISSN：1567-1739
通讯作者：
Li, Ruilian
作者机构：
[Deng, Lei; Li, Yifan; Tang, Jianfeng; Liu, Xunlin; Wang, Liang; Zhang, Xingming] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, Ruilian; He, Qiaoling] Hunan Agr Univ, Coll Agr, Changsha 410128, Hunan, Peoples R China.;[Deng, Huiqiu] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.;[Hu, Wangyu] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Li, Ruilian] H;Hunan Agr Univ, Coll Agr, Changsha 410128, Hunan, Peoples R China.
关键词：
Vacancy-impurity binding;Vanadium alloys;First-principles calculations;Diffusion;Precipitate
摘要：
This study aims at characterizing the interstitial Oxygen (O) behaviors in the Vanadium (V) Alloy by means of the first-principles calculations. For this, the interations between vacancy (Vac) and O interstitil atom are studied in detail to obtain the binding energies and stable structures of the complexes. It can be seen that monovacancy binding with two O atoms occupied the opposing octahedral stie are particularly stable, and is liable to form VacO2 cluster in the V alloys. According to the mass action analysis, the predicted temperature dependence of the concentration for VacOn complexes are presented. Apart from monovacancy, we also consider the trapping behavior of vacancy cluster on the O atoms. The results also prove that one vacancy can trap two O atoms in the V alloys. Based the diffusion theory, we obtain the diffusion coefficients as a function of temperature with or without the vacancy effect in the V alloys. The predicted O diffusion coefficients in defect-free V alloys from our first-principles calculations are in excellent ageement with the experimental data, meanings that the vacancy-limited mechanism does not play the key role for O diffusion in V alloys. Regarding the interactions between vacancy, solutes and O atom, combining with the diffusion barriers of O affected by vacancy and solute, we infer the formation mechanism of the precipitates in the V alloys. © 2017 Elsevier B.V.
语种：
英文
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Improved luminescence and energy-transfer properties of Ca14Al10Zn6O35:Ti4+,Mn4+ deep-red-emitting phosphors with high brightness for light-emitting diode (LED) plant-growth lighting
作者：
Zhou, Zhi;Li, Yiran;Xia, Mao* ;Zhong, Yuan;Zhou, Nan* ;...
期刊：
DALTON TRANSACTIONS ,2018年47(38):13713-13721 ISSN：1477-9226
通讯作者：
Xia, Mao;Zhou, Nan
作者机构：
[Xia, Mao; Zhong, Yuan; Xia, M; Zhou, Nan; Zhou, Zhi; Li, Yiran] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.;[Hintzen, H. T. (Bert)] Delft Univ Technol, Fac Appl Sci, Sect Fundamental Aspetts Mat & Energy, Grp Luminescent Mat, Delft, Netherlands.
通讯机构：
[Xia, M; Zhou, N] H;[Xia, Mao] C;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
摘要：
For plant-growth lighting, novel deep-red emission phosphors with high brightness were obtained by co-doping Ti4+ and Mn4+ into a Ca14Al10Zn6O35 substrate through a conventional solid-state reaction strategy. The nominal Ca14-(x+y)/2Al10-x-yZn6O35:xTi4+,yMn4+ (CAZO:Ti4+,Mn4+) phosphors could be excited by both near-ultraviolet (NUV) and blue-light-emitting diode (LED) chips efficiently and exhibited a strong deep-red emission band ranging from 650 nm to 750 nm, which should be the result of the 2E → 4A2 transition inside the [MnO6]8- octahedral. Multiple energy transfer from Ti4+ to Mn4+ was detected in this CAZO; whereby Ti4+ and Mn4+ phosphors were verified to be a result of the dipole-dipole interaction under excitation at 270 nm. LED plant-growth lights were fabricated using the as-prepared nominal Ca13.825Al9.65Zn6O35:0.15Mn4+,0.2Ti4+,0.005H3BO3 (CAZO:Mn4+,Ti4+,H3BO3) phosphors pumped by a 460 nm blue-chip; this luminaire could be used to greatly promote the cultivation of succulent plants. Combined with the attractive thermal stability as well as high quantum efficiency (QE) of this phosphor, it was demonstrated that these novel phosphors may be candidate deep-red luminescent materials for LED plant lighting. © 2018 The Royal Society of Chemistry.
语种：
英文
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Enhancing the electrochemical properties of LiTi2 (PO4 )3 /C anode for aqueous rechargeable lithium battery by Li vacancy
作者：
Zhou, Zhi;Li, Yiran;Xia, Mao* ;Zhou, Nan
期刊：
Solid State Ionics ,2018年315:1-6 ISSN：0167-2738
通讯作者：
Xia, Mao
作者机构：
[Xia, Mao; Zhou, Zhi; Zhou, Nan; Li, Yiran] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Xia, Mao] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Aqueous rechargeable lithium battery;Electrochemical kinetics;Energy storage;Li vacancy;LiTi 2 (PO 4 ) 3 /C composite
摘要：
In this paper, Li<inf>1–x</inf>Ti<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C composites (x = 0, 0.03, 0.05, 0.07) were synthesized by sol-gel approach, and the influence of Li vacancy on electrochemical performance of LiTi<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C anode for aqueous rechargeable lithium battery was studied. Li vacancy hardly influences the crystal structure and morphology of the composite. Electrochemical measurement results demonstrated that Li<inf>1–x</inf>Ti<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C exhibited better performance compared with pristine LiTi<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C, and Li<inf>0.95</inf>Ti<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C has the best properties. Li<inf>0.95</inf>Ti<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C delivered the discharge capacity of 104.3, 92.6, and 71.8 mAh g<sup>−1</sup>at 0.2, 5, and 20 C (1 C = 150 mA g<sup>−1</sup>), 4.1, 27.3, and 34.4 mAh g<sup>−1</sup>larger than that of Li<inf>0.95</inf>Ti<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C at corresponding rates, respectively. After 1000 cycles at 5 C, the discharge capacity retention for Li<inf>0.95</inf>Ti<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C can reach 75.3%, 15.4% larger than that for LiTi<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>/C. Our study reveals that Li vacancy is an efficient method to enhance the electrochemical properties of LiTi<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>-based materials.<br/> ©2017
语种：
英文
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The effects of interstitial impurities on the mechanical properties of vanadium alloys: A first-principles study
作者：
Zhang, Xingming;Tang, Jianfeng* ;Deng, Lei* ;Zhong, Gu;Liu, Xunlin;...
期刊：
Journal of Alloys and Compounds ,2017年701:975-980 ISSN：0925-8388
通讯作者：
Tang, Jianfeng;Deng, Lei
作者机构：
[Tang, Jianfeng; Deng, Lei; Li, Yifan; Liu, Xunlin; Zhang, Xingming] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Tang, Jianfeng; Hu, Wangyu] Hunan Agr Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Zhong, Gu] Suzhou Res Inst Nonferrous Met, Suzhou 215000, Peoples R China.;[Deng, Huiqiu] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Tang, JF; Deng, L] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Calculations;Ductility;Mechanical properties;Stacking faults;Vanadium alloys;First principles;First-principles calculation;First-principles study;Generalized stacking fault energies;Impurities concentration;Impurity effect;Interstitial impurities;Strong dependences;Impurities
摘要：
This study aims to elucidate the effects of interstitial impurities on the mechanical properties of vanadium alloys investigated by means of the first-principles computations. For this purpose, we study the generalized stacking-fault energies and the ductility parameters in different slip system to evaluate the strengthening and ductility potentials of interstitial impurities in V alloys. The results show that the generalized stacking-fault energy values for two slip systems all increase significantly after adding C, O, and N impurities in comparison with pure V. Moreover, the impurities located in the slip plane greatly increase the generalized stacking-fault energy, suggesting that the impurity effect is localized. The calculations reveal a remarkably strong dependence of the USF energies on the impurities concentration. Though evaluating the generalized stacking-fault energies and the ductility parameters, we draw a conclusion that impurities not only strengthen the V alloys but also reduce their plasticity. © 2017 Elsevier B.V.
语种：
英文
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Rapid green synthesis of gold nanocatalyst for high-efficiency degradation of quinclorac
作者：
Shi, Guorong* ;Li, Yulu;Xi, Gaihong;Xu, Qinqin;He, Zijun;...
期刊：
Journal of Hazardous Materials ,2017年335:170-177 ISSN：0304-3894
通讯作者：
Shi, Guorong
作者机构：
[Shi, Guorong; Xu, Qinqin; Cai, Jun; He, Zijun; Li, Yulu] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Liu, Yating; Shi, Guorong; Xi, Gaihong] Hunan Agr Univ, Tobacco Res Inst, Changsha 410128, Hunan, Peoples R China.;[Zhang, Jianhui] Hunan Inst Food Qual Supervis Inspect & Res, Changsha 410111, Hunan, Peoples R China.
通讯机构：
[Shi, Guorong] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Catalyst activity;Catalysts;Dechlorination;Efficiency;Gold;Gold nanoparticles;Nanocatalysts;Nanoparticles;Rate constants;Sodium Borohydride;Yeast;Catalytic dechlorination;Gold nanocatalyst;High-efficiency;Organic solvent-free;Particle diameters;Pseudo-first order kinetic model;Quinclorac;Reductive dechlorination;Gold compounds;carboxylic acid derivative;gold nanoparticle;herbicide;mannoprotein;quinclorac;sodium borohydride;unclassified drug;borane derivative;gold;herbicide;metal nanoparticle;quinclorac;quinoline derivative;catalyst;concentration (composition);dechlorination;degradation;gold;nanoparticle;quinclorac;reaction kinetics;temperature effect;yeast;Article;concentration (parameters);controlled study;dechlorination;degradation;fungal cell wall;green chemistry;nanocatalyst;nonhuman;particle size;rate constant;Saccharomyces cerevisiae;synthesis;temperature;transmission electron microscopy;yeast cell;catalysis;chemistry;halogenation;infrared spectroscopy;kinetics;metabolism;ultraviolet spectrophotometry;X ray diffraction;Saccharomyces cerevisiae;Borohydrides;Catalysis;Gold;Green Chemistry Technology;Halogenation;Herbicides;Kinetics;Metal Nanoparticles;Microscopy, Electron, Transmission;Quinolines;Saccharomyces cerevisiae;Spectrophotometry, Ultraviolet;Spectroscopy, Fourier Transform Infrared;Temperature;X-Ray Diffraction
摘要：
Porous chemical pretreated Saccharomyces cerevisiae was used as support, stabilizer, and reducing agent for the rapid green synthesis of gold nanocatalyst. Au nanoparticles (Au NPs) were generated through in-situ reduction of the absorbed Au(III) by the reductive functional groups of mannoproteins in yeast cell wall. The obtained spherical mono-dispersed Au NPs have an average particle diameter of 9.99±1.63nm as evidenced by TEM image, and exhibits excellent catalytic activity for the dechlorination of quinclorac to 8-quinoline-carboxylic acid by sodium borohydride. The reductive dechlorination of quinclorac is chemical reaction controlled and follows pseudo-first-order kinetic model. The rate constant increases with the increase of the temperature and decrease of the initial quinclorac concentration. The present synthesis protocol of Au nanocatalyst has the advantages of rapid, convenient and mild operation, high catalytic dechlorination efficiency and organic solvent-free nature. © 2017 Elsevier B.V.
语种：
英文
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Co(CO3)0.5(OH)•0.11H2O/graphene composites for supercapacitors
作者：
Li, Yanhua;Li, Jingbo;Zhang, Shiying;Wang, Nanfang;Zhou, Zhi
期刊：
International Journal of Electrochemical Science ,2015年10(10):8005-8016 ISSN：1452-3981
通讯作者：
Li, J.
作者机构：
[Li, Yanhua; Li, Jingbo; Zhang, Shiying] Hunan Province Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha, 410022, China;[Wang, Nanfang] School of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, 411104, China;[Zhou, Zhi] College of Science, Hunan Agricultural University, Changsha, 410128, China
通讯机构：
Hunan Province Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha, China
关键词：
Co(CO3)0.5(OH)•0.11H2O;Composites;Graphene;Supercapacitors
摘要：
Co(CO3)0.5(OH)•0.11H2O/graphene composites are synthesized by a hydrothermal method through altering reaction time. Their capacitive performance is studied. The results show the that the crystallite size of Co(CO3)0.5(OH)•0.11H2O in the composites increases when reaction time prolongs. The morphology of Co(CO3)0.5(OH)•0.11H2O in the composites consists of flake and rod structures and remains unchanged when reaction time prolongs. The specific capacitance of the composites decreases when the composites prepared in long reaction time. Co(CO3)0.5(OH)•0.11H2O/GNS-8 (Co(CO3)0.5(OH)•0.11H2O/graphene composites prepared for 8 h) electrode possesses the largest specific capacitance. A specific capacitance of 197.4 F g-1 is obtained at 0.2 A g-1 in Co(CO3)0.5(OH)•0.11H2O/GNS-8 electrode and its specific capacitance reduces to 136.2 F g-1 at 1.8 A g-1. 69% of the specific capacitance is remained. The specific capacitance after 2400 cycles reaches 364.5 F g-1 at 0.2 A g-1, which is 184.7% of initial specific capacitance. © 2015 The Authors.
语种：
英文
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Non-enzymatic sensing of uric acid using a carbon nanotube ionic-liquid paste electrode modified with poly(beta-cyclodextrin)
作者：
Li, Yonghong* ;Zhai, Xiurong;Wang, Haibo;Liu, Xinsheng;Guo, Le;...
期刊：
Microchimica Acta ,2015年182(11-12):1877-1884 ISSN：0026-3672
通讯作者：
Li, Yonghong
作者机构：
[Qiu, Hongyan; Li, Yonghong; Ji, Xiaoling; Wang, Ling] Ningxia Med Univ, Sch Publ Hlth, Yinchuan 750004, Peoples R China.;[Zhai, Xiurong] Jining Univ, Dept Chem & Chem Engn, Qufu 273155, Peoples R China.;[Wang, Haibo] Xinyang Normal Univ, Coll Chem & Chem Engn, Xinyang 464000, Peoples R China.;[Liu, Xinsheng] Ningxia Med Univ, Higher Vocat Tech Sch, Yinchuan 750004, Peoples R China.;[Guo, Le] Ningxia Med Univ, Sch Lab Med, Yinchuan 750004, Peoples R China.
通讯机构：
[Li, Yonghong] N;Ningxia Med Univ, Sch Publ Hlth, Yinchuan 750004, Peoples R China.
关键词：
beta-cyclodextrin;Carbon nanotube ionic liquid paste electrode;Electropolymerization;Uric acid;Linear sweep voltammetry
摘要：
We describe a nonenzymatic electrochemical sensor for uric acid. It is based on a carbon nanotube ionic-liquid paste electrode modified with poly(β-cyclodextrin) that was prepared in-situ by electropolymerization. The functionalized multi-walled carbon nanotubes and the surface morphology of the modified electrodes were characterized by transmission electronic microscopy and scanning electron microscopy. The electrochemical response of uric acid was studied by cyclic voltammetry and linear sweep voltammetry. The effects of scan rate, pH value, electropolymerization cycles and accumulation time were also studied. Under optimized experimental conditions and at a working voltage of 500mV vs. Ag/AgCl (3M KCl), response to uric acid is linear in the 0.6 to 400 μΜ and in the 0.4 to 1 mΜ concentration ranges, and the detection limit is 0.3 μΜ (at an S/N of 3). The electrode was successfully applied to the detection of uric acid in (spiked) human urine samples. © 2015, Springer-Verlag Wien.
语种：
英文
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辣椒素对茶油的抗氧化与清除超氧阴离子自由基活性研究
作者：
李宇;刘宇光;李霞;董新荣
期刊：
中国酿造 ,2014年33(9):86-88 ISSN：0254-5071
作者机构：
湖南农业大学理学院,湖南长沙,410128;[董新荣; 刘宇光; 李宇; 李霞] 湖南农业大学
关键词：
辣椒素;茶油;抗氧化活性;超氧阴离子自由基;邻苯三酚法
摘要：
研究了辣椒素对高温强化处理的油茶籽油的抗氧化性能及对O2-·的清除能力。添加抗氧化剂的油茶籽油在（60±2）℃恒温下强化处理后,用碘量法来测定过氧化值（POV）评判抗氧化性能。通过改良邻苯三酚自氧化法测定辣椒素清除自由基能力。样品经10 d的60℃加热处理后,未添加抗氧化剂的POV值达到32.16 mmol/kg,添加质量分数0.10%辣椒素的POV值为17.03 mmol/kg。在相同浓度下,辣椒素的对油茶籽油的抗氧化效果介于同BHT与VE之间。当辣椒素的物质的量浓度为0.006 0 mmol/m L时,对O2-·自由基的清除率达到80.75%,此时维生素E为81.12%而BHT为77.15%。辣椒素具有较强的清除O2-·自由基的能力。
语种：
中文
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应用化学专业“三维一体”自主实践教学体系研究与实践——以湖南农业大学为例
作者：
李霞;董新荣;张薇;李宇;文志勇
期刊：
科技创新导报 ,2014年(25):146-147 ISSN：1674-098X
作者机构：
湖南农业大学理学院 湖南长沙 410128;[张薇; 董新荣; 志勇; 李宇; 李霞] 湖南农业大学
关键词：
应用化学专业;三维一体;自主实践教学体系
摘要：
在分析应用化学专业实践教学发展过程及现状的前提下,针对应用化学专业特点,湖南农业大学应用化学专业提出了以课内实践教学为主渠道,校内实践第二课堂和社会实践为两翼的＂三维一体＂自主实践教育体系。通过多年实践,完善了该实践教育体系,学生在动手能力和创新性培养上取得了良好的效果。
语种：
中文
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SiO2 capsulized Cu active nanoparticles: Synthesis and activity study
作者：
Zhao, Yan;Zhao, Jingzhe* ;Su, Zhaohong;Hao, Xinli;Li, Yawen;...
期刊：
Journal of Materials Chemistry A ,2013年1(27):8029-8036 ISSN：2050-7488
通讯作者：
Zhao, Jingzhe
作者机构：
[Zhao, Jingzhe; Li, Na; Li, Yawen; Zhao, Yan; Hao, Xinli] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Su, Zhaohong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, Yunling] Henan Inst Sci & Technol, Coll Chem & Chem Engn, Xinxiang 453003, Peoples R China.
通讯机构：
[Zhao, Jingzhe] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
摘要：
Cu active nanoparticles (Cu ANPs) were synthesized in weakly acidic solution to preserve their catalytic activity. SiO<inf>2</inf> capsules were designed to insulate Cu ANPs from oxidation. The weak interaction between SiO<inf>2</inf> capsules and Cu ANPs ensured that the designed nanoparticles had good anti-oxidation property and potentially high activity. The increased anti-oxidation property with thicker SiO<inf>2</inf> capsules (Cu<inf>s3</inf> >Cu<inf>s2</inf> >Cu<inf>s1</inf>) and the order of reactivity to oxygen (Cu<inf>s1</inf> = Cu<inf>s2</inf> >Cu<inf>s3</inf>) showed that Cu ANPs with SiO<inf>2</inf> capsules (Cu<inf>s2</inf>) of appropriate thickness would be the best for application. By using the samples to construct non-enzymatic sensors, the detected activity toward electro-catalytic oxidation of glucose confirmed this conclusion. Dehiscence of SiO<inf>2</inf> capsules recovered the activity of the Cu ANPs in the catalytic ammonium perchlorate (AP) decomposition process. With the addition of 1.5% of Cu ANPs, the high temperature decomposition of AP decreased by 184.2°C. ©2013 The Royal Society of Chemistry.
语种：
英文
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紫甘薯色素水提工艺参数的研究
作者：
李霞;张丽珍;周宝磊;李宇;文志勇;...
期刊：
粮油食品科技 ,2013年21(3):15-17,61 ISSN：1007-7561
作者机构：
湖南农业大学理学院,湖南长沙,410128;[文志勇; 周宝磊; 董新荣; 李宇; 李霞; 张丽珍] 湖南农业大学
关键词：
紫甘薯;色素;水提工艺
摘要：
采用水溶液提取紫甘薯色素。选择pH值、料液比、浸提时间和浸提温度作为单因素进行梯度试验,确定其条件范围,通过正交试验确定紫甘薯色素提取的最佳工艺条件：pH值3（HCl）、料液比1∶2（g/mL）、浸提时间2 h、温度25℃,共提取3次,紫甘薯色素提取率可达94.85%。
语种：
中文
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农林院校天然产物化学实验教学改革与思考
作者：
李霞;张薇;董新容;李宇;文志勇
期刊：
科技资讯 ,2012年(32):188-189 ISSN：1672-3791
作者机构：
湖南农业大学理学院,湖南长沙,410128;[文志勇; 张薇; 李宇; 董新容; 李霞] 湖南农业大学
关键词：
天然产物化学实验;教学内容;教学方;教学手段
摘要：
分析了天然产物化学传统实验教学在新的教学模式下存在的问题,从实验教学内容、实验教学方法和实验手段多方面阐述了天然产物化学实验教学的改革路径。实践证明,天然产物实验教学的改革取得了较好的效果,充分调动了学生的积极性和主动性,提高了学生的动手能力和综合实验技能。
语种：
中文
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汉源花椒挥发油超临界CO2萃取与GC-MS分析
作者：
李宇;周昕;董新荣
期刊：
化学与生物工程 ,2010年27(2):90-94 ISSN：1672-5425
作者机构：
湖南农业大学理学院,湖南,长沙,410128;[董新荣; 李宇; 周昕] 湖南农业大学
关键词：
花椒;挥发油;超临界CO2萃取;GC-MS分析
摘要：
用超临界CO2萃取汉源花椒挥发油,并以GC-MS分析了其成分.通过正交实验确定超临界CO2萃取挥发油的优化条件为:以75%乙醇(添加量为原料质量的5%)为夹带剂、萃取压力30 MPa、萃取温度40℃、萃取时间2.0 h,此时,挥发油的收率为9.92%.用GC-MS分离出69个峰, 鉴定出56种物质,主要成分为:芳樟丁酸酯(30.212%)、(1α,3α,4β,6α)-4,7,7-三甲基-双环[4.1.0]庚烷-3-醇(10.940%)、(+)-4-蒈烯(1.826%)、4-亚甲基-1-(1-甲基乙基)-双环[3.1.0]环己烷(1.109%)、β-月桂烯(1.170%)、柠檬烯(5.784%)、3,7-二甲基-1,6-辛二烯-3-醇(5.742%)、n-棕榈酸(0.914%)、(Z,Z)-9,12-十八碳烯酸(2.952%)等.结果表明,汉源花椒挥发油的超临界CO2萃取收率比水蒸气蒸馏的收率高,且成分丰富.
语种：
中文
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