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Carbon polyhedra encapsulated Si derived from Co-Mo bimetal MOFs as anode materials for lithium-ion batteries

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Journal of Materials Science & Technology 2023年第28期159卷 91-98页

作者： Huan Ruan Lifeng Zhang Shuai Li Kai Wang Wenhuan Huang shouwu guo School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China College of Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Silicon(Si)holds promise as an anode material for lithium-ion batteries(LIBs)as it is widely avail-able and characterized by high specific capacity and suitable working ***,the relatively low electrical conductivity of Si and the significantly high extent of volume expansion realized dur-ing lithiation hinder its practical *** prepared N-doped carbon polyhedral micro cage en-capsulated Si nanoparticles derived from Co-Mo bimetal metal-organic framework(MOFs)(denoted as Si/CoMo@NCP)and explored their lithium storage performance as anode materials to address these *** Si/CoMo@NCP anode exhibited a high reversible lithium storage capacity(1013 mAh g^(−1)at 0.5 A g^(−1)after 100 cycles),stable cycle performance(745 mAh g^(−1)at 1 A g^(−1)after 400 cycles),and excellent rate performance(723 mAh g^(−1)at 2 A g^(−1)).Also,the constructed the full-cell NCM 811//Si/CoMo@NCP exhibited well reversible *** excellent electrochemical performances of Si/CoMo@NCP were at-tributed to two unique *** encapsulation of NCP with doped nitrogen and porous structural carbon improves the electrical conductivity and cycling stability of the *** introductions of metallic cobalt and its oxides help to improve the rate capability and lithiation capacity of the materials following multi-electron reaction mechanisms.

关键词： Si anode Carbon polyhedra Cobalt/molybdenum double doping Lithium-ion batteries Electrochemical property

Direct Pyrolysis of Molybdophosphate-based Ionic Salt for One-step Synthesis of N,P Co-doped Carbon/Mo03-x Hybrids with Superior Lithium Storage Performance

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Chemical Research in Chinese Universities 2019年第5期35卷 842-847页

作者： ZHANG Lifeng SHEN Kechao JIANG Yongtao guo Yu LIU Yi guo shouwu School of Materials Science and Engineering Shaanxi University of Science and TechnologyXian 710021P.R.China Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Shaanxi University of Science and TechnologyXi'an 710021P.R.China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240P.R.China

N, P co-doped carbon/MoO3-x hybrids(NPC/MoO3-x) were synthesized via one-step pyrolysis of molybdophosphate-based ionic salt precursor. Doped carbon and oxygen vacancies(OVs) were synchronously introduced into the NPC/MoO3-x hybrids without any other redundant procedure. As anodes for lithium-ion batteries, the NPC/MoO3-x hybrids delivered a high initial Coulombic efficiency(ICE) of 81% as well as high charge capacity of 516 mA·h/g after 100 cycles at 1 A/g, indicating the excellent reversibility and rate capability. The enhanced lithium storage performance was attributed to the rational combination of surface engineering and OVs, which is beneficial to the more active sites and fast ionic/electronic transport.

关键词： Lithium ion battery Anode Molybdenum oxide Doped carbon Oxygen vacancy

Fe_(2)Mo_(3)O_(8) nanoparticles self-assembling 3D mesoporous hollow spheres toward superior lithium storage properties

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 156-163页

作者： Lifeng Zhang Yifei Song Weiping Wu Robert Bradley Yue Hu Yi Liu shouwu guo School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China Department of Electrical and Electronic Engineering School of MathematicsComputer Science and EngineeringCityUniversity of LondonLondonEC1V 0HBUK Department of Materials University of OxfordOxfordOX13PHUK MatSurf Technology Ltd. The Old Stables Marion LodgeCumbriaCA101NWUK School of Energy Resources University of WyomingLaramieWY 82071USA School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Unique self-assembled iron(II)molybdenum(IV)oxide(Fe_(2)Mo_(3)O_(8))mesoporous hollow spheres have been facilely constructed via the bubble-template-assisted hydrothermal synthesis method combined with simple *** compact assembly of small nanoparticles on the surface of the hollow spheres not only provides more active sites for the Fe_(2)Mo_(3)O_(8),but also benefits the stability of the hollow structure,and thus improved the lithium storage properties of *** Fe_(2)Mo_(3)O_(8) mesoporous hollow spheres exhibit high initial discharge and charge capacities of 1189 and 997 mA∙h∙g^(−1) respectively,as well as good long-term cycling stability(866 mA∙h∙g^(−1) over 70 cycles)when used as a lithium-ion battery *** feasible material synthesis strategy will inspire the variation of structural design in other ternary metal molybdates.

关键词： molybdates Fe_(2)Mo_(3)O_(8) hollow spheres lithium ion batteries anodes

SnP entangled by carbon nanotube networks as anode for pseudocapacitive half/full battery

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Journal of Materiomics 2023年第2期9卷 362-369页

作者： Qian Zhao Dan Zhao Lan Feng Jian Yu Yi Liu shouwu guo School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi'an710021China Department of Electronic Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai200240China

Due to the lower operating voltage and higher theoretical specific capacity,tin phosphide is considered a class of materials with prospects as an anode material for lithium-ion batteries(LIBs).Among them,tin monophosphide has attracted people's attention due to its unique layered ***,because of the challenging synthesis method and metastable nature,the application of SnP is *** this work,tin phosphide/carbon nanotubes(SnP/CNTs)are prepared by controlling the nucleation and adjusting the ratio of phosphorus/carbon using carbon nanotube as ***-MOF is used as a template to make the morphology of SnP more evenly,and carbon nanotubes can also be used as a conductive network to increase the speed of electron *** an anode material for LIBs,SnP/CNTs reveals superior rate performances(reversible capability of 610 mA·h·g^(-1)at 2000 mA·g^(-1)).The full-cell was assembled and tested,after 50 cycles at 0.1 C,the capacity can maintain 292 mA·h·g^(-1),and its capacity retention rate can reach 80.5%.After 230 cycles,its capacity can maintain at around 223 mA·h·g*** addition,SnP/CNTs materials exhibit 89%pseudocapacitance contribution upon cycling,which indicates the robust Lit storage and satisfactory fast-charging ***,SnP/CNTs suggests a promising anode material for energy storage system.

关键词： SnP Lithium-ion storage Carbon nanotubes Sn4P3 Pseudocapacitive

Fluorine-free Ionic Liquid Based on Thiocyanate Anion with Propylene Carbonate as Electrolytes for Supercapacitors： Effects of Concentration and Temperature

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Chemical Research in Chinese Universities 2017年第5期33卷 779-784页

作者： ZHANG Lifeng DU Suqing SONG Qiaolan LIU Yi guo shouwu School of Materials Science and Engineering Shaanxi University of Science and Technology Xi'an 710021 P. R. China Department of Electronic Engineering School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China

High performance supercapacitors were constructed using ionic liquid 1-ethyl-3-methylimidazolium thi- ocyanate（EmimSCN）-based electrolyte with chemically reduced graphene oxide（CRGO） as electrodes. Propylene carbonate（PC） was selected as the solvent due to its stable physical and electrochemical properties. Then, in-depth study of the concentration and temperature effects on the electrochemical properties of the EmimSCN/PC electrolyte was carried out. Electrochemical measurements revealed that 2.0 mol/L EmimSCN/PC electrolyte delivered good electrochemical performance（131 F/g of the specific capacity after 3000 cycles at room temperature）. Moreover, the assembled supercapacitors exhibited good capacitive behavior at an extending temperature（397 F/g of the specific capacity after 3000 cycles at 50 ℃）, demonstrating that the EmimSCN/PC electrolyte is a promising candidate for safe high-power supercapacitors.

关键词： Electrolyte Supercapacitor Ionic liquid Chemically reduced graphene oxide Capacitance

Influencing factors on local reduction of graphene oxide with a heated AFM tip

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Nuclear Science and Techniques 2011年第4期22卷 245-250页

作者： WU Zhongliang SHEN Yue ZHOU Xingfei guo shouwu ZHANG Yi Ningbo University Zhejiang 315211 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Research Institute of Micro/Nano Science and Technology Shanghai Jiao Tong University Shanghai 200240 China

In this paper,the factors influencing the local thermal reduction of graphene oxide (GO) sheets are *** lateral force microscopy and scanning polarization force microscopy verify that the heated tips of atomic force microscope (AFM) can thermally reduce the GO into electrical conductive *** tip temperature,heating time,and loading force applied by the AFM tip are found to have important effects on the thermal reduction of GO,while the environmental humidity is negligible.

关键词：石墨氧化物影响因素针尖原子力显微镜纳米结构加热时间环境湿度热还原

Facile synthesis of hollow Ti_(3)AlC_(2)microrods in molten salts via Kirkendall effect

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Journal of Advanced Ceramics 2022年第9期11卷 1491-1497页

作者： Yi LIU Chuangye WANG Wei LUO Liang BAI Yang XU Xiaodong HAO Jianfeng ZHU shouwu guo School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi’an 710021China Department of Electronic Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The microstructure and morphology of Ti_(3)AlC_(2)powders not only affect the preparation of Ti_(3)C_(2) MXene but also have a great influence on their potential applications,such as microwave absorbers,alloy additives,or catalytic ***,the synthesis of Ti_(3)AlC_(2)powders with desired microstructure and morphology remains a ***,hollow Ti_(3)AlC_(2)microrods were prepared for the first time in NaCl/KCl molten salts by using titanium,aluminum,and short carbon fibers as starting *** was found that the short carbon fibers not only performed as carbon source but also acted as sacrificial ***,it was revealed that TiC and Ti2AlC were initially formed on the surface of carbon *** subsequent reactions between the outer Ti,Al and the inner carbon were dominated by the Kirkendall effect which gave rise to the formation of a hollow *** on this mechanism,hollow Ti_(3)AlC_(2)microspheres and a series of hollow TiC,Ti_(2)AlC,and V_(2)AlC powders were also successfully *** work provides a facile route to synthesize hollow MAX phases and may give enlightenment on preparing other hollow carbide powders via the Kirkendall effect in the molten salts.

关键词： Ti_(3)AlC_(2) molten salt synthesis(MSS) hollow structure Kirkendall effect

Sacrificial template synthesis of(V_(0.8)Ti_(0.1)Cr_(0.1))_(2)AlC and carbon fiber@(V_(0.8)Ti_(0.1)Cr_(0.1))_(2)AlC microrods for efficient microwave absorption

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Journal of Materials Science & Technology 2022年第16期111卷 236-244页

作者： Wei Luo Yi Liu Chuangye Wang Dan Zhao Xiaoyan Yuan Jianfeng Zhu Lei Wang shouwu guo School of Material Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China Department of Electronic Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong universityShanghai 200240China

The morphology of MAX phase powders significantly influences their microwave absorption ***,the traditional synthesis via solid-state reactions produces irregular powders,and the preparation of MAX phase powders with specific morphology remains a ***,(VTiCr)Al C MAX phase microrods were fabricated for the first time in NaCl/KCl molten salts using vanadium,titanium,chromium,aluminum,and short carbon fibers as *** was found that despite acting as a carbon source,carbon fibers also acted as sacrificial *** adjusting the molar ratio of metal powders and short carbon fibers,a series of carbon fiber@(V_(0.8)Ti_(0.1)Cr_(0.1))_(2)AlC microrods with core-sheath structure were also *** fiber@(V_(0.8)Ti_(0.1)Cr_(0.1))_(2)AlC microrods with a molar ratio of 8:2 showed the optimum microwave absorption *** reflection loss(RL)value reached up to–63.26 d B at 2.40 mm,and the effective absorption bandwidth(EAB)was about 5.28 GHz with a thickness of2.02 *** on the electromagnetic parameter analysis and theoretical simulation,the enhanced microwave absorption performance was attributed to the synergistic effect of different factors like dielectric loss,magnetic loss,multiple reflection,and *** work offers a facile route to modulate the morphology of MAX phase powders and may accelerate its application as microwave absorbers.

关键词： MAX phases Microwave absorption Sacrificial template Microrod

Enhancing photocurrent density of organic hybrid solar cells with graphene quantum dots

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Enhancing photocurrent density of organic hybrid solar cells...