High-performance LiTi2 (PO4 )3 @carbon anode using double carbon sources for aqueous lithium ion battery
作者：
Zhou, Nan;Huang, Shengxiong;Hong, Tao;Luo, Wei;Tian, Yun;Lu, Xiangyang;Zhou, Zhi*
期刊：
Ceramics International ,2017年43(12):9327-9333 ISSN：0272-8842
通讯作者：
Zhou, Zhi
作者机构：
[Hong, Tao; Huang, Shengxiong; Luo, Wei; Zhou, Nan; Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Tian, Yun; Lu, Xiangyang; Zhou, Nan; Zhou, Zhi] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;[Tian, Yun; Lu, Xiangyang; Zhou, Nan; Zhou, Zhi] Hunan Agr Univ, Hunan Prov Univ Key Lab Agr Biochem & Biotransfor, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Aqueous lithium ion battery<&wdkj&>Anode<&wdkj&>LiTi2(PO4)3<&wdkj&>Composite<&wdkj&>Double carbon sources
摘要：
In this paper, LiTi<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>@carbon composite as anode for aqueous lithium ion battery has been successfully synthesized by in-situ carbon coating method using oxalic acid and glucose as double carbon sources. XRD results confirm the rhombohedral NASICON-type LiTi<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>structure of the as-prepared composite. The LiTi<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>@carbon composite using double carbon sources (LTP-OG-10) disperses well, and the coated carbon layer has the appropriate thickness of 3–7 nm, which result in proper balance of the good electrical conductivity and the fast kinetics of diffusion of lithium ions. LTP-OG-10 exhibits better electrochemical performance compared with those using oxalic acid (LTP-O) or glucose (LTP-G) single carbon source. LTP-OG-10 anode delivers the discharge capacity of 112.5 mA h g<sup>−1</sup>, 96.8 mA h g<sup>−1</sup>, and 54.2 mA h g<sup>−1</sup>at 0.2 C, 5 C and 20 C, respectively, much larger than that of LTP-O and LTP-G. Moreover, LTP-OG-10 demonstrated excellent cycling performance, with the capacity retention of 71.1% after 400 cycles at 0.2 C, 22.9% higher than that of LTP-G. The good electrochemical properties of LTP-OG-10 is mainly ascribed to the increase of defects, high-quality and appropriate thickness of carbon layer. Our study reveals that preparing LiTi<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf>@carbon composite using double carbon sources is an efficient approach to enhance its electrochemical properties. ©2017 Elsevier Ltd and Techna Group S.r.l.
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One pot synthesis of nitrogen-doped hollow carbon spheres with improved electrocatalytic properties for sensitive H 2 O 2 sensing in human serum
作者：
Peng, Chang;Zhou, Suya;Zhang, Xuemei;Zeng, Tianqin;Zhang, Wei;Li, Hongmei;Liu, Xiaoying* ;Zhao, Peng*
期刊：
Sensors and Actuators, B: Chemical ,2018年270:530-537 ISSN：0925-4005
通讯作者：
Liu, Xiaoying;Zhao, Peng
作者机构：
[Liu, Xiaoying; Peng, Chang; Zhang, Wei; Zhou, Suya; Zhang, Xuemei; Zeng, Tianqin] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, Hongmei; Zhao, Peng] Southern Med Univ, Sch Pharmaceut Sci, Guangzhou Key Lab Drug Res Emerging Virus Prevent, Guangdong Prov Key Lab New Drug Screening, 1838 Guangzhou Ave North, Guangzhou 510515, Guangdong, Peoples R China.
通讯机构：
[Liu, Xiaoying] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhao, Peng] Southern Med Univ, Sch Pharmaceut Sci, Guangzhou Key Lab Drug Res Emerging Virus Prevent, Guangdong Prov Key Lab New Drug Screening, 1838 Guangzhou Ave North, Guangzhou 510515, Guangdong, Peoples R China.
关键词：
N-doped hollow carbon spheres<&wdkj&>One pot synthesis<&wdkj&>Electrical catalyst<&wdkj&>H2O2<&wdkj&>Human serum samples
摘要：
N-doped hollow carbon spheres (N-HCS) have been proved as efficient electrical catalytic materials with outstanding oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) ability. However, conventional approaches for the synthesis of N-HCS always involved multistep procedures. In this paper, by appropriately controlling the polymerization of tetraethoxysilane (TEOS) and resorcinol/formaldehyde (RF), N-HCS have been synthesized through “one pot”method without use of surfactant. Next, the ORR and OER of N-HCS were conducted to examine its electrocatalytic ability. Finally, it was modified on the glassy carbon electrode (GCE) as an improved electrical catalyst to monitor H<inf>2</inf>O<inf>2</inf>in human serum samples. The linear ranges for monitoring H<inf>2</inf>O<inf>2</inf>were from 0.05 mM to 29.5 mM and from 29.5 mM to 47.5 mM with a limit of detection of 0.02 mM. The recoveries for the assays in human serums were between 92.5% and 107.4%. Therefore, we believe that this newly synthesized N-HCS will play a significant role in the synthesis and application of electrocatalytic materials and the development of novel electrochemical sensors.<br/> ©2018 Elsevier B.V.
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Carbon-based materials as adsorbent for antibiotics removal: Mechanisms and influencing factors
作者：
Xiang, Yujia;Xu, Zhangyi;Wei, Yuyi;Zhou, Yaoyu* ;Yang, Xiao;Yang, Yuan;Yang, Jian* ;Zhang, Jiachao;Luo, Lin;Zhou, Zhi
期刊：
Journal of environmental management ,2019年237:128-138 ISSN：0301-4797
通讯作者：
Zhou, Yaoyu;Yang, Jian
作者机构：
[Xu, Zhangyi; Wei, Yuyi; Xiang, Yujia; Yang, Yuan; Yang, Jian; Zhou, Yaoyu; Zhang, Jiachao; Zhou, YY; Yang, J; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Xu, Zhangyi; Wei, Yuyi; Xiang, Yujia; Yang, Yuan; Yang, Jian; Zhou, Yaoyu; Zhang, Jiachao; Luo, Lin] Hunan Agr Univ, Hunan Int Sci & Technol Cooperat Base Agr Typ Pol, Changsha 410028, Hunan, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhou, Yaoyu; Yang, Xiao] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China.
通讯机构：
[Zhou, YY; Yang, J] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.
关键词：
Adsorption;Adsorption mechanism;Antibiotics;Carbon-based materials;Influencing factors
摘要：
With the development of the removal of organic pollutants in the soil and water environment, antibiotics have been considered as emerging pollutants and received considerable attention among the scientific community. Thus, there is a need for an effective, economical, fast, operational feasible and environmental-friendly technology to remove antibiotics. Adsorption technology would be one of the most promising option on the basis that it best meets the criteria we set out above. From the most primitive activated carbon to the most innovative modified biochar, carbon-based materials have played a significant role in the adsorption process of antibiotics all the time. This paper reviews the adsorption behavior of some representative antibiotics (e.g., chloramphenicols, sulfonamides, tetracyclines, flouroquinolones) over various carbonaceous materials (i.e., activated carbon, carbon nanotubes, graphene, and biochar). Nevertheless, in addition to the structural characteristics and adsorption capacities of carbon-based materials, a special emphasis was placed on the underlying adsorption mechanisms and roles of different influencing factors in the adsorption process. Moreover, the knowledge gaps and research challenges have been highlighted, including design and optimization of the carbonaceous materials for antibiotics adsorption.
语种：
英文
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DNA-encoded signal conversion for sensitive microgravimetric detection of small molecule-protein interaction.
作者：
Fei, Yue-Hua;Liu, Dengyou;Wu, Zai-Sheng* ;Shen, Guo-Li;Yu, Ru-Qin
期刊：
Bioconjugate Chemistry ,2011年22(12):2369-2376 ISSN：1043-1802
通讯作者：
Wu, Zai-Sheng
作者机构：
[Shen, Guo-Li; Yu, Ru-Qin; Wu, Zai-Sheng; Fei, Yue-Hua] Hunan Univ, Chem & Chem Engn Coll, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Liu, Dengyou] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Wu, Zai-Sheng] Hunan Univ, Chem & Chem Engn Coll, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.
摘要：
Identification and quantification of small organic molecules capable of binding to a protein of interest with reasonable affinity and specificity is a central problem. Via developing DNA-encoded recognizing probe, we validate a proof-of-principle for constructing of small target-to-DNA conversion that screens the small molecule-protein interaction. Successful identification of beta-indole acetic acid, abscisic acid, or 2,4-dichlorophenoxyacetic acid/corresponding antibody binding implies its fascinating potential for interrogating small molecule/protein interaction.
语种：
英文
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Multifractal detrended fluctuation analysis for image texture feature representation
作者：
Wang, Fang;Li, Zong-Shou* ;Liao, Gui-Ping
期刊：
International Journal of Pattern Recognition and Artificial Intelligence ,2014年28(3):1455005 ISSN：0218-0014
通讯作者：
Li, Zong-Shou
作者机构：
[Wang, Fang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Liao, Gui-Ping; Wang, Fang] Hunan Agr Univ, Agr Informat Inst, Changsha 410128, Hunan, Peoples R China.;[Li, Zong-Shou] Jishou Univ, Coll Informat Sci & Engn, Jishou 416000, Peoples R China.
通讯机构：
[Li, Zong-Shou] Jishou Univ, Coll Informat Sci & Engn, Jishou 416000, Peoples R China.
关键词：
Texture feature<&wdkj&> multifractal analysis<&wdkj&> multifractal detrended fluctuation analysis<&wdkj&> noise<&wdkj&> compression<&wdkj&> blur
摘要：
Multifractal theory has been widely used in different kinds of fields. In this paper, methods were proposed to extract two kinds of multifractal descriptors of gray series and two-dimensional surfaces for gray image based on the multifractal detrended fluctuation analysis. The proposed multifractal parameters can be well described by texture feature through the test of some textures. Three aspects of experiments have been conducted to verify the robustness of the proposed parameters, which include noise immunity, degree of image blurring and compression ratio. Comparisons were conducted between the proposed parameters and other kinds of texture feature parameters calculated by the standard multifractal analysis, the method of differential box counting and the methods of gray level co-occurrence matrix. Results demonstrate that the proposed exponents of H(2) and h(2) have great noise immunity and are robust to image compression and blurring.
语种：
英文
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Analysis of speech signals' characteristics based on MF-DFA with moving overlapping windows
作者：
Zhao, Huan;He, Shaofang*
期刊：
Physica A: Statistical Mechanics and its Applications ,2015年442:343-349 ISSN：0378-4371
通讯作者：
He, Shaofang
作者机构：
[He, Shaofang; Zhao, Huan] Hunan Univ, Sch Informat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[He, Shaofang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[He, Shaofang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
MF-DFA<&wdkj&>Speech signals<&wdkj&>Multi-fractal characteristics
摘要：
In this paper, multi-fractal characteristics of speech signals are analyzed based on MF-DFA, and it is found that the multi-fractal features are influenced greatly by frame length and noise, besides, there is a little difference between them among speech frames. Secondly, motivated by framing and using frame shift to ensure the continuity and smooth transition of speech in speech signals processing, an advanced MF-DFA (MF-DFA with forward moving overlapping windows) is proposed. The length of moving overlapping windows is determined by parameter θ. Given the value of time scale s, we have MF-DFA with the maximum moving overlapping windows and MF-DFA with half overlapping windows when θ=1/s and θ=1/2 respectively. Moreover, when θ=1 we exactly have MF-DFA. Numerical experiments and analysis illustrate that the multi-fractal characteristics based on AMF-DFA outperform MF-DFA and MF-DMA in stability, noise immunity and discrimination.
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英文
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Direct synthesis of micro-coiled carbon fibers on graphite substrate using co-electrodeposition of nickel and sulfur as catalysts
作者：
Liu, Dengyou* ;Luo, Qimei;Wang, Huixian;Chen, Jinhua
期刊：
Materials and Design ,2009年30(3):649-652 ISSN：0261-3069
通讯作者：
Liu, Dengyou
作者机构：
[Luo, Qimei; Liu, Dengyou; Wang, Huixian] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Chen, Jinhua] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Liu, Dengyou] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Micro-coiled carbon fibers<&wdkj&>Catalysts<&wdkj&>Electrochemical deposition<&wdkj&>Sulfur<&wdkj&>Chemical vapour deposition<&wdkj&>Scanning electron microscopy
摘要：
Micro-coiled carbon fibers were directly prepared on the graphite substrate using co-electrodeposition of nickel and sulfur as catalysts, in this paper. The diameter of coil and that of micro-coiled carbon fiber are about 800 nm and 400 nm, respectively. Compared with the current preparation methods of catalysts, electrochemical deposition is an effective, cheap and simple technique. Especially, this method is suitable for preparation of ally catalyst. The parameters of electrochemical deposition (deposition time and current density) have little influence on helix of growth and growth mechanism of carbon fibers. By adjusting the electrolyte solution, the amount of sulfur in catalyst are easily carried out, and it is found that sulfur content in catalyst plays an important role on morphological characteristics of carbon fibers.
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英文
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Simultaneous determination of hydroquinone, catechol and resorcinol with high selectivity based on hollow nitrogen-doped mesoporous carbon spheres decorated graphene
作者：
Peng, Chang;Li, Zefan;Zhang, Xuemei;Zhou, Suya;Zhang, Wei;Liu, Xiaoying* ;Zhao, Peng*
期刊：
Journal of the Electrochemical Society ,2018年165(5):B212-B219 ISSN：0013-4651
通讯作者：
Liu, Xiaoying;Zhao, Peng
作者机构：
[Liu, Xiaoying; Peng, Chang; Zhang, Wei; Zhou, Suya; Zhang, Xuemei; Li, Zefan] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhao, Peng] Southern Med Univ, Guangzhou Key Lab Drug Res Emerging Virus Prevent, Sch Pharmaceut Sci, Guangdong Prov Key Lab New Drug Screening, Guangzhou 510515, Guangdong, Peoples R China.
通讯机构：
[Liu, Xiaoying] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhao, Peng] Southern Med Univ, Guangzhou Key Lab Drug Res Emerging Virus Prevent, Sch Pharmaceut Sci, Guangdong Prov Key Lab New Drug Screening, Guangzhou 510515, Guangdong, Peoples R China.
摘要：
For the first time, we have synthesized hollow nitrogen-doped mesoporous carbon spheres decorated graphene (NMC-G) and applied it in the simultaneous determination of hydroquinone (HQ) resorcinol (RC) and catechol (CC) in real samples. In the composite of NMC-G, hollow mesoporous carbon spheres possess high surface area and graphene have shown high electro-catalytic activity to many electroactive substances. As a result, the oxidation overpotentials of HQ, RC and CC decreased and the potential separations were 0.38, 0.49 and 0.11 V for CC and RC, RC and HQ, and HQ and CC, respectively. A linear response was obtained from 5 μM to 150 μM for the simultaneous determination of HQ, RC and CC, the linear equation was I - I<inf>0</inf>= 0.7695 + 0.08751C<inf>HQ</inf>for HQ, I - I<inf>0</inf>= 0.00858 + 0.02243C<inf>RC</inf>for RC and I - I<inf>0</inf>= 0.5027 + 0.07829C<inf>CC</inf>for CC, respectively. Furthermore, the concentration of HQ, RC, and CC were assayed in tap water samples, the recoveries were from 95.0% to 106.6%.<br/> ©2018 The Electrochemical Society.
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英文
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Influence of Encapsulated Water on Luminescence Energy, Line Width, and Lifetime of Carbon Nanotubes: Time Domain Ab Initio Analysis
作者：
Li, Wei* ;Long, Run;Hou, Zhufeng;Tang, Jianfeng;Prezhdo, Oleg V.*
期刊：
Journal of Physical Chemistry Letters ,2018年9(14):4006-4013 ISSN：1948-7185
通讯作者：
Li, Wei;Prezhdo, Oleg V.
作者机构：
[Tang, Jianfeng; Li, Wei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, Wei] Jilin Univ, Inst Theoret Chem, Lab Theoret & Computat Chem, Changchun 130023, Jilin, Peoples R China.;[Long, Run] Beijing Normal Univ, Minist Educ, Coll Chem, Key Lab Theoret & Computat Photochem, Beijing 100875, Peoples R China.;[Hou, Zhufeng] NIMS, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan.;[Prezhdo, Oleg V.] Univ Southern Calif, Dept Chem, Los Angeles, CA 90089 USA.
通讯机构：
[Li, Wei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, Wei] Jilin Univ, Inst Theoret Chem, Lab Theoret & Computat Chem, Changchun 130023, Jilin, Peoples R China.;[Prezhdo, Oleg V.] Univ Southern Calif, Dept Chem, Los Angeles, CA 90089 USA.
摘要：
In a broad range of applications, carbon nanotubes (CNTs) are in direct contact with a condensed-phase environment that perturbs CNT properties. Experiments show that water molecules encapsulated inside of semiconducting CNTs reduce the electronic energy gap, enhance elastic and inelastic electron-phonon scattering, and shorten the excited-state lifetime. We rationalize the observed effects at the atomistic level using real-time time-dependent density functional theory combined with nonadiabatic molecular dynamics. Encapsulated water makes the nanotube more rigid, suppressing radial breathing modes while enhancing and slightly shifting the optical G-mode. Water screens Coulomb interactions and shifts charge carrier energies and wave functions. The screening, together with distortion of the CNT geometry and lifting of orbital degeneracy, produces a luminescence red shift. Enhanced elastic and inelastic electron-phonon scattering explains line width broadening and shortening of the excited-state lifetime. The influence of water on the CNT properties is similar to that of defects;however, in contrast to defects, water creates no new phonon modes or electronic states in the CNTs. The atomistic understanding of the influence of the condensed-phase environment on CNT optical, electronic, and vibrational properties, and electron-vibrational dynamics guides design of novel CNT-based materials.<br/> Copyright ©2018 American Chemical Society.
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英文
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Oxidant-Triggered C1-Benzylation of Isoquinoline by Iodine-Catalyzed Cross-Dehydrogenative-Coupling with Methylarenes
作者：
Shi, Xin;Zhang, Feng;Luo, Wen-Kun;Yang, Luo*
期刊：
Synlett ,2017年28(4):494-498 ISSN：0936-5214
通讯作者：
Yang, Luo
作者机构：
[Luo, Wen-Kun; Shi, Xin; Yang, Luo] Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Hunan, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Yang, Luo] Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Hunan, Peoples R China.
关键词：
benzylation<&wdkj&>Minisci reaction<&wdkj&>iodine<&wdkj&>isoquinoline<&wdkj&>isoquinolinone
摘要：
A practical iodine-catalyzed oxidative functionalization of isoquinolines with methylarenes is developed, which can be triggered by the selected oxidants to produce C1- or N-benzyl-substituted products selectively. This method utilizes readily available isoquinolines and methylarenes as starting materials and proceeds under metal-free conditions with broad substrate scope with respect to methylarenes, avoiding the usage of expensive metal catalysts and generation of halide and metal wastes. © Georg Thieme Verlag Stuttgart · New York-Synlett 2017.
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英文
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Effects of solute size on solid-solution hardening in vanadium alloys: A first-principles calculation
作者：
Zhang, Xingming;Tang, Jianfeng;Deng, Lei;Deng, Huiqiu* ;Xiao, Shifang;Hu, Wangyu
期刊：
Scripta Materialia ,2015年100:106-109 ISSN：1359-6462
通讯作者：
Deng, Huiqiu
作者机构：
[Xiao, Shifang; Deng, Huiqiu; Hu, Wangyu; Zhang, Xingming] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.;[Deng, Lei; Tang, Jianfeng; Zhang, Xingming] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Deng, Huiqiu] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.
关键词：
Vanadium alloys<&wdkj&>Solute size<&wdkj&>Solubility<&wdkj&>Stacking fault energy<&wdkj&>First-principles calculation
摘要：
We performed first-principles calculations to quantify the effect of 26 transition metals on the mechanical properties of vanadium (V) alloys. The generalized stacking-fault (GSF) energies of the solutes were evaluated in three slip systems. Solutes with similar atomic radii to that of V present high GSF energies, which increase the energy barrier for double-kink nucleation and result in excellent strengthening effect. This size effect indicates that noble metals can significantly improve the mechanical strength of V alloys.
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英文
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First-principles study of the binding preferences and diffusion behaviors of solutes in vanadium alloys
作者：
Deng, Lei;Zhang, Xingming;Tang, Jianfeng;Deng, Huiqiu;Xiao, Shifang;Hu, Wangyu*
期刊：
Journal of Alloys and Compounds ,2016年660:55-61 ISSN：0925-8388
通讯作者：
Hu, Wangyu
作者机构：
[Deng, Lei; Tang, Jianfeng; Zhang, Xingming] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Tang, Jianfeng; Hu, Wangyu] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Xiao, Shifang; Deng, Huiqiu; Hu, Wangyu] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Hu, Wangyu] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.
关键词：
Solute–solute binding<&wdkj&>Solute-vacancy binding<&wdkj&>Solute diffusion<&wdkj&>V alloys<&wdkj&>First-principles calculations
摘要：
In order to elucidate the role of solutes in vanadium alloys, the solute diffusions and the interactions of solute-solute and solute-vacancy have been investigated by means of the first-principles calculations. It is shown that large solutes are energetically favorable to combine with adjacent solute and to form the solute-solute nearest-neighbor pairs. In order to obtain qualitative understanding, the charge density differences for some special solute-solute binding are plotted to analyze the bonding interaction between solute atom and their nearest-neighbor host atoms. The solute-solute binding energies indicated that apart from the 3d transition metals, there is a clear trend of increasing binding energy with increasing solute volume. In particular, large solutes have larger binding energies for bonding with vacancies and can be considered as vacancy trappers in the crystal. As a comparison with solute diffusions, the self-diffusion coefficients of vanadium are determined. Activation energies for vacancy-mediated solute diffusion in vanadium are also determined. We conclude that the major contribution to the activation energy comes from the diffusion energy barrier, and both all follow the same trend. The noble metals have higher migration barriers than others, which means that these elements are inactive in the vanadium alloys. By contrast, the barriers for the large solutes almost cease to exist due to the formation of stable solute-centered divacancy. ©2015 Published by Elsevier B.V.
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英文
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A hybrid of CoOOH nanorods with carbon nanotubes as a superior positive electrode material for supercapacitors
作者：
Zhu, Lei;Wu, Wenyi;Wang, Xiaowei;Wu, Xiongwei* ;Tang, Weiping;Wu, Yuping
期刊：
RSC Advances ,2014年4(103):59088-59093 ISSN：2046-2069
通讯作者：
Wu, Xiongwei
作者机构：
[Zhu, Lei; Wu, Xiongwei; Wu, Yuping] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhu, Lei; Wang, Xiaowei; Wu, Yuping; Wu, Wenyi] Fudan Univ, Key Lab Mol Catalysis & Innovat Mat, Dept Chem & Shanghai, NEML, Shanghai 200433, Peoples R China.;[Zhu, Lei; Tang, Weiping] Shanghai Acad Spaceflight Technol, Shanghai Inst Space Power Sources SISP, Shanghai 200233, Peoples R China.
通讯机构：
[Wu, Xiongwei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
摘要：
A hybrid of CoOOH nanorods with conductive MWCNTs is successfully prepared. Due to the introduction of MWCNTs, the diameter of the CoOOH nanorods is smaller than that of pristine CoOOH nanorods. Because of the conductive nanostructure network and smaller diameter of the CoOOH nanorods, it exhibits high capacitance, good high-rate capability and excellent cycling performance as a positive electrode for supercapacitors in a 0.5 mol L<sup>-1</sup> KOH aqueous electrolyte. Its specific capacity is 312 F g<sup>-1</sup> at the current density of 1 A g<sup>-1</sup>, and 182 F g<sup>-1</sup> even at the current density of 10 A g<sup>-1</sup>. After 10 000 full cycles, the capacitance retention is 97%. The hybrid is of great promise for practical application. ©The Royal Society of Chemistry 2014.
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英文
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Entanglement dynamics of a double two-photon Jaynes-Cummings model with Kerr-like medium
作者：
Ouyang Xi-Cheng;Fang Mao-Fa* ;Kang Guo-Dong;Deng Xiao-Juan;Huang Li-Yuan
期刊：
Chinese Physics B ,2010年19(3):55-60 ISSN：1674-1056
通讯作者：
Fang Mao-Fa
作者机构：
[Kang Guo-Dong; Ouyang Xi-Cheng; Deng Xiao-Juan; Fang Mao-Fa] Hunan Normal Univ, Coll Phys & Informat Sci, Changsha 410081, Hunan, Peoples R China.;[Ouyang Xi-Cheng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Huang Li-Yuan] Changsha Univ, Dept Elect & Commun Engn, Changsha 410003, Hunan, Peoples R China.
通讯机构：
[Fang Mao-Fa] Hunan Normal Univ, Coll Phys & Informat Sci, Changsha 410081, Hunan, Peoples R China.
关键词：
entanglement sudden death;concurrence;two-photon Jaynes-Cummings model;Kerr-like medium
摘要：
In this paper, the entanglement dynamics of a double two-photon Jaynes-Cummings model with Kerr-like medium is investigated. It is shown that initial entanglement has an interesting subsequent time evolution, including the so-called entanglement sudden death effect. It is also shown analytically that the Kerr-like medium can repress entanglement sudden death and enhance the degree of atom-atom entanglement. A more interesting fact is that the Kerr effect is more obvious when each of the two cavities with have the Kerr-like medium than only one of them with the Kerr-like medium.
语种：
英文
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Multifractal detrended moving average analysis for texture representation
作者：
Wang, Fang* ;Wang, Lin;Zou, Rui-Biao
期刊：
Chaos (Woodbury, N.Y.) ,2014年24(3):033127 ISSN：1054-1500
通讯作者：
Wang, Fang
作者机构：
[Zou, Rui-Biao; Wang, Fang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wang, Lin] Univ New Brunswick, Dept Math & Stat, Fredericton, NB E3B 5A3, Canada.
通讯机构：
[Wang, Fang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
摘要：
Multifractal detrended moving average analysis (MF-DMA) is recently employed to detect long-range correlation and multifractal nature in stationary and non-stationary time series. In this paper, we propose a method to calculate the generalized Hurst exponent for each pixel of a surface based on MF-DMA, which we call the MF-DMA-based local generalized Hurst exponent. These exponents form a matrix, which we denote by LHq. These exponents are similar to the multifractal detrended fluctuation analysis (MF-DFA)-based local generalized Hurst exponent. The performance of the calculated LHq is tested for two synthetic multifractal surfaces and ten randomly chosen natural textures with analytical solutions under three cases, namely, backward (θ = 0), centered (θ = 0.5), and forward (θ = 1) with different q values and different sub-image sizes. Two sets of comparison segmentation experiments between the three cases of the MF-DMA-based LHq and the MF-DFA-based LHq show that the MF-DMA-based LHq is superior to the MF-DFA-based LHq. In addition, the backward MF-DMA algorithm is more efficient than the centered and forward algorithms. An interest finding is that the LHq with q < 0 outperforms the LHq with q > 0 in characterizing the image features of natural textures for both the MF-DMA and MF-DFA algorithms. © 2014 AIP Publishing LLC.
语种：
英文
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Simultaneous melting of shell and core atoms, a molecular dynamics study of lithium–copper nanoalloys
作者：
Tang, Jianfeng;Yang, Jianyu
期刊：
Journal of Nanoparticle Research ,2015年17(7):1-12 ISSN：1388-0764
通讯作者：
Yang, JY
作者机构：
[Tang, Jianfeng] Hunan Agr Univ, Dept Appl Phys, Changsha 410128, Hunan, Peoples R China.;[Yang, Jianyu] Hunan Inst Engn, Xiangtan 411104, Peoples R China.
通讯机构：
[Yang, JY ] Hunan Inst Engn, Xiangtan 411104, Peoples R China.;Hunan Inst Engn, Xiangtan 411104, Peoples R China.
关键词：
Nanoalloy;Solid-liquid interface;Melting;Molecular dynamics;Modeling;and simulation;Energy storage
摘要：
Melting of nanoalloys originates from the alloy surface and gradually propagates into the interior region. The thermal stability of Li cores and Cu shells nanoalloy with size of 3.5 nm is studied through molecular dynamics and embedded atom method with the use of potential energy, Lindemann index, and radial distribution function. Results show that the shell and core Li atoms are melted in two steps: first, some Li atoms in the core migrate to the nanoalloy surface and maintain a typical solid state despite that the system temperature is higher than the bulk melting point of Li because of Li solidification in the solid–liquid interface; second, the shell and core Li atoms are simultaneously melted at high temperatures. A comparative study of [email protected] nanoalloys with different Li atomic numbers shows that thermal stability is enhanced with the decreasing number of Li atoms within the nanoalloys because of weak binding for Cu thin shells. © 2015, Springer Science+Business Media Dordrecht.
语种：
英文
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Rhodium-catalyzed oxidative decarbonylative Heck-type coupling of aromatic aldehydes with terminal alkenes
作者：
Kang, Lei;Zhang, Feng;Ding, Lin-Ting;Yang, Luo*
期刊：
RSC Advances ,2015年5(122):100452-100456 ISSN：2046-2069
通讯作者：
Yang, Luo
作者机构：
[Ding, Lin-Ting; Kang, Lei; Yang, Luo] Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Hunan, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Yang, Luo] Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Hunan, Peoples R China.
摘要：
A rhodium-catalyzed oxidative decarbonylative Heck-type coupling of aromatic aldehydes with terminal alkenes to afford 1,2-disubstituted alkenes with good regio- and E-selectivity is developed. This reaction employs readily available aromatic aldehydes as the aryl electrophile counterpart and relies on selected acyl chloride as the crucial additive to activate the rhodium catalyst precursor. ©The Royal Society of Chemistry 2015.
语种：
英文
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Enhanced electrochemical sensitivity towards acetaminophen determination using electroactive self-assembled ferrocene derivative polymer nanospheres with multi-walled carbon nanotubes
作者：
Chen, Yuan;Liu, Xiaoying;Wu, Tengteng;Hou, Wenli;Liu, Meiling* ;Zhang, Youyu;Yao, Shouzhuo
期刊：
Electrochimica Acta ,2018年272:212-220 ISSN：0013-4686
通讯作者：
Liu, Meiling
作者机构：
[Zhang, Youyu; Chen, Yuan; Wu, Tengteng; Liu, Meiling; Hou, Wenli; Yao, Shouzhuo] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;[Liu, Xiaoying] Hunan Agr Univ, Coll Sci, Sci & Technol Innovat Platform, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Liu, Meiling] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.
关键词：
Electroactive ferrocene polymer nanospheres<&wdkj&>MWCNT-PDDA-FPS<&wdkj&>Electrochemical sensor<&wdkj&>Acetaminophen
摘要：
Electron mediators have the ability to facilitate electron acceptance and donation, which can accelerate the electron transfer during the electrochemical process. Few research has been reported about electroactive polymer nanospheres as redox mediators for sensing to date. In this study, we synthesized a new electroactive ferrocene derivative polymer nanospheres (FPS) via a facile and self-assembly method. The obtained FPS was characterized by UV-Vis spectra, Fourier transform infrared spectroscopy, transmission electron microscopy and dynamic light scattering. Based on the electroactive property of FPS, a new electrochemical sensor for acetaminophen (AP) based on the nanocomposite of multi-walled carbon nanotubes-ploy-diallyl-dimethyl-ammonium chloride-FPS (MWCNT-PDDA-FPS) was firstly developed. The greatly enhanced electrochemical performance towards AP determination can be obtained owing to the electrocatalysis of electroactive FPS and good conductivity of MWCNT. The AP sensor exhibits a wide sensing linear range from 3 to 1100 mu M and the detection limit is 0.6 mu M(S/N = 3). Therefore, these ferrocene derivative polymer nanospheres may become a new nanomaterial to construct of platforms for bioanalytical and electrochemical immune research in the future. (C) 2018 Elsevier Ltd. All rights reserved.
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, M
作者机构：
[Zhou, Zhi; Li, Yiran; Xia, Mao; Zhou, Nan] 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, M ] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Energy storage<&wdkj&>Aqueous rechargeable lithium battery<&wdkj&>LiTi2(PO4)3/C composite<&wdkj&>Li vacancy<&wdkj&>Electrochemical kinetics
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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Selective Synthesis of Aryl Nitriles and 3-Imino-1-oxoisoindolines via Nickel-Promoted C(sp(2))-H Cyanations.
作者：
Yu, Lin;Chen, Xiang;Song, Ze-Nan;Liu, Da;Hu, Liang;Yu, Yongqi;Tan, Ze* ;Gui, Qingwen*
期刊：
Organic Letters ,2018年20(11):3206-3210 ISSN：1523-7060
通讯作者：
Tan, Ze;Gui, Qingwen
作者机构：
[Liu, Da; Tan, Ze; Hu, Liang; Yu, Lin; Yu, Yongqi; Chen, Xiang; Song, Ze-Nan] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Gui, Qingwen] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Tan, Ze] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Gui, Qingwen] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
摘要：
An efficient nickel-promoted selective monocyanation of benzamides with TMSCN via 8-aminoquinoline directed ortho C-H activation has been developed. Varieties of functionalized ortho-cyanated (hetero)aryl nitriles can be selectively synthesized in moderate to good yields. These cyanation products can be easily transformed into various 3-imino-1-oxoisoindolines in a one-pot procedure. The mild reaction conditions, use of cheap and commercially available reagents, wide functional group tolerance, and operational convenience make this protocol practical to the synthetic community. © 2018 American Chemical Society.
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英文
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