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Nitrogen-Doped TiO_2–C Composite Nanofibers with High-Capacity and Long-Cycle Life as Anode materials for Sodium-Ion Batteries

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Nano-Micro Letters 2018年第4期10卷 255-267页

作者： Su Nie Li Liu Junfang Liu Jianjun Xie Yue Zhang Jing Xia Hanxiao Yan Yiting Yuan Xianyou Wang National Base for International Science and Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion School of Chemistry Xiangtan University Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai University

Nitrogen-doped TiO_2–C composite nanofibers(TiO_2/N–C NFs) were manufactured by a convenient and green electrospinning technique in which urea acted as both the nitrogen source and a pore-forming agent. The TiO_2/N–C NFs exhibit a large specific surface area(213.04 m^2 g^(-1)) and a suitable nitrogen content(5.37 wt%). The large specific surface area can increase the contribution of the extrinsic pseudocapacitance, which greatly enhances the rate capability. Further, the diffusion coefficient of sodium ions(DNa_+) could be greatly improved by the incorporation of nitrogen atoms. Thus, the TiO_2/N–C NFs display excellent electrochemical properties in Na-ion batteries. A TiO_2/N–C NF anode delivers a high reversible discharge capacity of 265.8 mAh g^(-1) at 0.05 A g^(-1) and an outstanding long cycling performance even at a high current density(118.1 m Ah g^(-1)) with almost no capacity decay at 5 A g^(-1) over 2000 cycles. Therefore, this work sheds light on the application of TiO_2-based materials in sodium-ion batteries.

关键词： Nanofibers Anode materials Sodium-ion batteries Pseudocapacitance Nitrogen-doping

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Comparison of the Morphology,Structures and Mechanical Properties of Teleost Fish Scales Collected from New Zealand

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Journal of Bionic Engineering 2019年第2期16卷 328-336页

作者： Deju Zhu Chaohui Zhang Peng Liu Laith A.Jawad Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil EngineeringHunan UniversityChangsha 410082China International Science Innovation Collaboration Base for Green&Advanced Civil Engineering Materials of Hunan Province Hunan UniversityChangsha 410082China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Flat Bush ManukauAuckland 2016New Zealand

The mechanical properties and structures of fish scales have generated considerable research interest,however,comparative studies for different fish scales from difl^rent water regions have not been *** this paper,the surface morphologies,hierarchical structures and mechanical properties of four kinds of fish scales collected from freshwater,shallow sea,and deep sea in New Zealand are *** results indicate that the surface morphologies of those fish scales are similar at ventro-lateral,dorso-lateral and anterior locations,and the hierarchical structures of those fish scales all consist of two layers:a bone layer and a collagen layer composed of collagen ***,the spiral angles of the collagen lamellaes of different scales are *** largest are Mugil cephalus scales,while the smallest are Cyprinus carpio *** the mechanical behaviors of those fish scales,the tensile strength of Carassius auratus scales is the largest,but the ductility is the *** sieboldii scales have the best ***,the relationship between hierarchical structures and mechanical properties of fish scales is *** is found that the spiral angles of the collagen lamellaes and bond/collagen thickness ratio both have a great influence on the mechanical properties of fish scales.

关键词： morphology hierarchical structure mechanical property fish scale water region

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Regularly Tuning Quantum Interference in Single-Molecule Junctions through Systematic Substitution of Side Groups with Varied Electron Effects

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Chinese Journal of Chemistry 2024年第11期42卷 1217-1222页

作者： Xianjing Xie Yirong Zhang Junrui Zhang Xingyuan Cui Wei Liu Xunshan Liu Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang Province School of Chemistry and Chemical EngineeringZhejiang Sci-Tech University928 Second StreetHangzhouZhejiang310018 China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin130022 China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjingJiangsu210094 China

Investigating the quantum interference effect in single molecules is essential to comprehensively understand the underlying mechanism of single-molecule charge *** this study,we employed the mother molecule m-OPE and introduced a series of side groups with various electronic effects at the 2-position of the central phenyl ring,creating four daughter m-OPE *** single molecular conductivities of these molecule wires were measured using the scanning tunneling microscope breaking junction *** findings demonstrate that the substitutions regularly modulate the destructive quantum interference occurring within the m-OPE *** combining optical and electrochemical investigations,along with density functional theory computations,we discover that the conductivity of the molecules corresponds to the electron-donating/withdrawing ability of the ***,by adjusting the electron structures of the molecular backbone,we can systematically tailor the destructive quantum interference in the m-OPE molecules.

关键词： Quantum interference Single-molecule junctions Electron effect substituents Charge transport Molecular devices

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interface engineering of Co_(9)S_(8)/SnS heterostructure as a high-performance anode for lithium/sodium-ion batteries

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Rare Metals 2024年第2期43卷 612-623页

作者： Jia Luo Shi-Li Xiang Dan-Yang Han An Liu João Cunha Gang-Yong Li Zhao-Hui Hou Hong Yin School of Chemistry and Chemical Engineering Key Laboratory of Hunan Province for Advanced Carbon-based Functional MaterialsHunan Institute of Science and TechnologyYueyang414006China Hubei Jiufengshan Laboratory Wuhan430206China International Iberian Nanotechnology Laboratory(INL) Av.Mestre Jose Veiga4715-330BragaPortugal

Transition metal sulfide(TMS)anodes exhibit the characteristics of phase stability and high capacity for lithium/sodium-ion batteries(LIBs/SIBs).However,the TMS anodes often suffer from poor electronic conductivity,low ionic diffusion and large volume expansion during Li/Na-ion intercalation significantly impairing the Li/Na-storage ***,a long chain heterostructure composed of the Co_(9)S_(8) and SnS are first reported,which can generate rich phase interfaces,and small crystal *** unique structure can facilitate the properties of reactivity,conductivity and ionic *** addition,the heterostructure surface is modified by the N-doped carbon(N-DC@(CoSn)S),successfully improving the structural *** synergistic effects of Co_(9)S_(8)/SnS heterostructure and coated carbon layer effectively increase the capacity and cycling *** N-DC@(CoSn)S anode delivers enhanced high specific capacities of 820.6 mAh·g^(−1) at 1.0 A·g^(–1) after 500 cycles for LIBs and 339.2 mAh·g^(–1)at 0.5 A·g^(–1) after 1000 cycles for SIBs,*** work is expected to provide a material design idea for preparing LIBs/SIBs with high capacity and long cycling life.

关键词： interface engineering Long chain heterostructure High capacity Cycling stability Li Na-ion batteries

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Achieving high yield of Ti3C2Tx MXene few-layer flakes with enhanced pseudocapacior performance by decreasing precursor size

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Chinese Chemical Letters 2020年第4期31卷 1039-1043页

作者： Jianguang Xu Jiale Zhu Chen Gong Zexin Guan Dan Yang Zhihan Shen Wei Yao Haijiang Wu School of Materials Science and Engineering Yancheng Institute of TechnologyYancheng 224051China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang UniversityShaoyang 422000China

Ti3C2Tx,a most studied member of MXene family,shows promise as a candidate electrode for pseudocapacitor due to its electronic conductivity and hydrophilic ***,the unsatisfactory yield of Ti3C2Tx few-layer flakes significantly restricted it in real ***,we proposed a simple solution to boost the yield of Ti3C2Tx few-layer flakes by decreasing precursor *** using the small500 mesh Ti3AlC2 powders as raw material,high yield of 65%was successfully ***,the asreceived small flakes also exhibit an enhanced pseudocapacior performance owing to their excellent electrical conductivity,expanded inte rlayer space and more O content on the *** work not only sheds light on the cost effective mass production of Ti3C2Tx few-layer flakes,but also provides an efficient solution for the design of MXene electrodes with high pseudocapacior performance.

关键词： MXene Ti3C2Tx High yield Pseudocapacitor Precursor size Flake size

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Industrial-Level Paired Electrosynthesis of Valuable Chemicals over a High-Performance Heterostructural Electrode

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Angewandte Chemie 2025年第10期137卷

作者： Guorong Zhou Dr. Han Cheng Yilin Wu Prof. Yun Tong Ruihao Dai Jiaye Zhu Dr. Xiaonan Zheng Cong Lin Prof. Pengzuo Chen Prof. Changzheng Wu School of Chemistry and Chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University Hangzhou 310018 Zhejiang China Key Laboratory of Precision and Intelligent Chemistry CAS Center for Excellence in Nanoscience CAS Key Labora-to-ry of Mechanical Behavior and Design of Materials Collaborative Innovation Center of Chemistry for Energy Mate-rials (iChEM) University of Science and Technology of China Hefei Anhui 230026 P. R. China. College of Chemistry and Chemical Engineering Henan Institute of Science and Technology Xinxiang 453003 P. R. China

Paired electrosynthetic technology is of significance to realize the co-production of high-added value chemicals. However, exploiting efficient bifunctional electrocatalyst of the concurrent electrocatalysis to achieve the industrial-level performance is still challenging. Herein, an amorphous Co 2 P@MoO x heterostructure is rationally designed by in situ electrodeposition strategy, which is acted as excellent bifunctional catalysts for the electrocatalytic nitrite reduction reaction (NO 2 RR) and glycerol oxidation reaction (GOR). The membrane-electrode assembly (MEA) electrolyzer realizes a low voltage of 1.30 V, robust stability over 200 h at 100 mA cm −2 , high Faraday efficiencies and yield of NH 3 (above 95 %, 49.7 mg h −1 cm −2 ) and formate (above 95 %, 304.4 mg h −1 cm −2 ) at industrial-level current density of 500 mA cm −2 . In situ spectroscopy studies have shown that high-valence CoOOH is the main active material of GOR, and the main catalytic conversion pathway of NO 2 RR involves key *NH 2 OH reaction intermediates. In addition, theoretical calculations confirm that the Co 2 P@MoO x heterostructure has strong interfacial electronic interaction and optimized reaction energy barriers, which endows its intrinsically high electrocatalytic activity for the co-electrosynthesis of NH 3 and formate.

关键词： Co2P@MoOx Amorphous heterostructure Paired electrosynthesis Nitrite reduction reaction Glycerol oxidation reaction

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Layer-by-layer epitaxy growth of thickness-controllable two-dimensional tungsten disulfide

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science China(Information sciences) 2024年第5期67卷 302-310页

作者： Jieyuan LIANG Zixing ZOU Junwu LIANG Di WANG Biao WANG Anshi CHU Jiali YI Cheng ZHANG Lizhen FANG Tian ZHANG Huawei LIU Xiaoli ZHU Dong LI Anlian PAN Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan Institute of Optoelectronic IntegrationCollege of Materials Science and Engineering School of Physics and ElectronicsHunan University School of Electronic Information and Electrical Engineering Changsha University School of Physics and Telecommunication Engineering Yulin Normal University Units Semiconductor Technology Co. Ltd. School of Physics and Electronics Hunan Normal University

Bilayer transition metal dichalcogenides（TMDs） balance the high mobility of single layers with the high state density of multilayers and therefore have promising application prospects in high-performance electronics. However, the layer-controlled growth of 2D materials is still confronted with challenges such as poor repeatability between different labs and a limited understanding of the growth mechanism at the atomic scale. Herein, we report a new carbon-assisted chemical vapor deposition process that can realize the growth of WS2sheets with high yield, precise thickness controllability, and repeatability. We show that carbon can act as a reducing agent and catalyst that preferentially reacts with the WO3precursor to form intermediate WO3-xproducts with low-valence state W. The resulting oxycarbide gas has a low surface adsorption energy when deposited on the surface of as-grown WS2, which provides nucleation sites for the subsequent layer of WS2growth and leads to the vertical growth of WS2sheets. The growth mechanism is thoroughly investigated. Electrical transport measurements show that the produced bilayer WS2possesses a high carrier mobility(up to 58 cm2·V-1·s-1) and small subthreshold swing（estimated to be 148 mV/decade）,which are among the best reported results for TMDs produced using CVD.

关键词： WS$_2$ thickness-controlled growth chemical vapor deposition additive carbon

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High-stable and High-capacity Sn/SnO_(2)@C as Anode of Lithium-ion Batteries

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Journal of Wuhan University of technology(materials science) 2024年第4期39卷 805-813页

作者：徐天星 WU Jie 李亚娟肖宏 College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science Central South UniversityChangsha 410083China Hunan Times New Energy Technology Co. LtdLuxi 416100China

We synthesized size-controllable nanoparticles with homogeneous distribution of carbon and Sn/SnO_(2)by a solvothermal *** effects of different carbon content and hydrothermal time on the composition,morphology and electrochemical properties of the materials were *** with bulk materials,nanoparticles materials not only have high specific surface area,but also can provide abundant reaction sites,thus enhancing the electrochemical activity of electrode *** importantly,the optimized microspheres Sn/8C-24 delivers a superior electrochemical performance,achieving a specific discharge capacity of 700.4 mAh·g^(-1)after 150 cycles at 0.5 A·g^(-1),and the Coulomb efficiency reaches 98.65%,which is promising for anode of LIBs.

关键词： Sn anode nanoparticles hydrothermal method

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Actively Reconfigurable Valley Topological Edge and Corner States in Photonic Crystals Based on Phase Change Material Ge2Sb2Te5

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激光与光电子学进展 2024年第5期61卷 557-571页

作者： Li Wei Peng Yuxiang Su Peihao Li Jianbo Wang Kaijun Liu Exian Liu Jianqiang He Mengdong College of Science Hunan Province Key Laboratory of Materials Surface&Interface Science and TechnologyCentral South University of Forestry and TechnologyChangsha 410004HunanChina College of Science Jiujiang UniversityJiujiang 332005JiangxiChina

The immunity of topological states against backscattering and structural defects provides them with a unique advantage in the exploration and design of high-precision low-loss optical ***,the operating bandwidth of the topological states in certain photonic structures is difficult to actively tune and flexibly *** this study,we propose a valley topological photonic crystal(TPC)comprising two inverse honeycomb photonic crystals,consisting of hexagonal silicon and Ge2Sb2Te5(GST)*** GST transitions from the amorphous phase to the crystalline phase,the edge band of the TPC appears as a significant redshift and is inversed from a“∪”to an“∩”shape with topological phase transition,which enables active tuning of the operating bandwidth and propagation direction of topological edge *** the topological edge and corner states in a triangular structure constructed using TPCs can be simultaneously adjusted and reconfigured via GST phase transition,along with a change in the group number of corner *** the adjustability of topological edge states and electromagnetic coupling between two different topological bearded interfaces,we develop a multichannel optical router with a high tuning degree of freedom,where channels can be actively reconfigured and their on/off states can be freely *** study provides a strategy for the active regulation of topological states and may be beneficial for the development of reconfigurable topological optical devices.

关键词： topological edge states topological corner states phase change material active reconfiguration topological photonic crystal

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Ultrafine Sn_(4)P_(3)nanocrystals from chloride reduction on mechanically activated Na surface for sodium/lithium ion batteries

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Nano Research 2020年第11期13卷 3157-3164页

作者： Zhiliang Liu Xiangxi Wang Zhuoyan Wu Sungjin Yang Shaolei Yang Shunpeng Chen Xinteng Wu Xinghua Chang Piaoping Yang Jie Zheng Xingguo Li Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking University5 Yiheyuan RoadBeijing100871China Comprehensive Energy Research Center Institute of Science and TechnologyChina Three Gorges CorporationBeijing100038China Key Laboratory for Mineral Materials and Application of Hunan Province School of Minerals Processing and BioengineeringCentral South UniversityChangsha410083China

Nanostructured metal phosphides are very attractive materials in energy storage and conversion,but their applications are severely limited by complicated preparation steps,harsh conditions and large excess of highly toxic phosphorus *** we develop a highly efficient one-step method to synthesize Sn_(4)P_(3)nanostructure based on simultaneous reduction of SnCl_(4)and PCl_(3)on mechanically activated Na surface and in situ *** low-toxic PCl3 displays a very high phosphorizing efficiency(100%).Furthermore,this simple method is powerful to control phosphide *** Sn_(4)P_(3)nanocrystals(<5 nm)supported on carbon sheets(Sn_(4)P_(3)/C)are obtained,which is due to the unique bottom-up surface-limited *** the anode material for sodium/lithium ion batteries(SIBs/LIBs),the Sn_(4)P_(3)/C shows profound sodiation/lithiation extents,good phase-conversion reversibility,excellent rate performance and long cycling stability,retaining high capacities of 420 mAh/g for SIBs and 760 mAh/g for LIBs even after 400 cycles at 1.0 A/*** simple and efficient preparation,low-toxic and high-efficiency phosphorus source and good control of nanosize,this method is very promising for low-cost and scalable preparation of high-performance Sn_(4)P_(3)anode.

关键词： metal phosphide chloride reduction ultrafine Sn_(4)P_(3)nanocrystals lithium-ion battery(LIB) sodium-ion battery(SIB) anode material

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