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One-step synthesis of carbon-coated monocrystal molybdenum oxides nanocomposite as high-capacity anode materials for lithiumion batteries

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Journal of Materiomics 2021年第3期7卷 498-507页

作者： Zhiguo Rong Canfeng Fang Zhongyuan Zhang Wenfang Miao Xiyang Li Jingshuang Liang Wenfei Yang Yinong Wang Xiane Guo Youngguan Jung Xinglong Dong School of Materials Science and Engineering Key Laboratory of Materials Modification by LaserIon and Electron Beams(Ministry of Education)Dalian University of TechnologyDalian116023China School of Computer and Network Engineering Shanxi Datong UniversityDatong037009China Department of Mechanical Engineering Kumoh National Institute of TechnologyDaeharkro 53GumiGyeong-Buk730-701South Korea

Benefitting from higher specific capacities,acceptable cost,nontoxicity and unique crystal structures,the molybdenum oxides have been studied as the anode materials for lithium ion batteries(LIBs).Herein,a direct current(DC)arc-discharge plasma technique has been developed to in-situ synthesize carboncoated monocrystal molybdenum oxides((MoO3NRs/MoO2NPs)@C)nanocomposites,using coarse MoO_(3) bulk as the raw material and methane(CH4)gas as the carbon *** is indicated that crystallographic traits of MoO_(3) and MoO2 nuclei give rise to an anisotropic growth of monocrystal MoO3 nanorods(NRs)alongdirection and an isotropic growth of monocrystal MoO_(2) nanoparticles(NPs).The carbon shells on MoO3/MoO2 nanostructures are generated from the absorption of carbon atoms in surrounding atmosphere or the release of supersaturated carbon atoms in MoeOeC solid *** constitution and pseudo-capacitive behavior of(MoO3NRs/MoO2NPs)@C bring merits to excellent cycling performance and rate capability,i.e.a remarkable specific capacity of 840 mAh·g^(-1) after 100 cycles at a current density of 0.1 Ag^(-1) and a retained capacity of 210 mAh·g^(-1) at 6.4 A g^(-1).This work has offered a simple and efficient approach to fabricate the carbon-coated molybdenum oxides nanostructures for promising anode materials of LIBs。

关键词： molybdenum oxides Arc plasma Carbon-coated Anode Lithium ion battery

A Promising MoO_x-based Catalyst for n-Heptane Isomerization

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Chinese Chemical Letters 2003年第7期14卷 748-751页

作者： Song Hai CHAI Xin Ping WANG Ying Jun WANG Tian Xi CAI State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116012

The SiO2 and g-Al2O3 supported MoOx catalyst and a MoOx-SiO2 catalyst have been studied in a conventional fixed-bed flow reactor for n-alkanes isomerization. It is shown that the MoOx-SiO2 catalyst with SiO2 framework, in which the bulk MoOx phase is large enough to form typical mesoporous structure, is promising in terms of its advantages of both improved mechanical strength and high catalytic properties over the supported MoOx and bulk MoOx catalyst.

关键词： n-Heptane isomerization molybdenum oxides SiO2 mesopore MoOx-based.

Oxygen-deficient MoO_(x)/Ni_(3)S_(2) heterostructure grown on nickel foam as efficient and durable self-supported electrocatalysts for hydrogen evolution reaction

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Frontiers of Chemical Science and Engineering 2023年第4期17卷 437-448页

作者： Zihuan Yu Haiqing Yan Chaonan Wang Zheng Wang Huiqin Yao Rong Liu Cheng Li Shulan Ma Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China School of Basic Medical Sciences Ningxia Medical UniversityYinchuan 750004China Analytical and Testing Center Beijing Normal UniversityBeijing 100875China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

High-performance and ultra-durable electrocatalysts are vital for hydrogen evolution reaction(HER)during water ***,by one-pot solvothermal method,MoO_(x)/Ni_(3)S_(2) spheres comprising Ni_(3)S_(2) nanoparticles inside and oxygen-deficient amorphous MoO_(x) outside in situ grow on Ni foam(NF),to assembly the heterostructure composites of MoO_(x)/Ni_(3)S_(2)/*** adjusting volume ratio of the solvents of ethanol to water,the optimized MoO_(x)/Ni_(3)S_(2)/NF-11 exhibits the best HER performance,requiring an extremely low overpotential of 76 mV to achieve the current density of 10 mA∙cm‒2(η_(10)=76 mV)and an ultra-small Tafel slope of 46 mV∙dec^(-1) in 0.5 mol∙L^(-1) H_(2)SO_(4).More importantly,the catalyst shows prominent high catalytic stability for HER(>100 h).The acid-resistant MoO_(x) wraps the inside Ni_(3)S_(2)/NF to ensure the high stability of the catalyst under acidic *** functional theory calculations confirm that the existing oxygen vacancy and MoO_(x)/Ni_(3)S_(2) heterostructure are both beneficial to the reduced Gibbs free energy of hydrogen adsorption(|∆G_(H*)|)over Mo sites,which act as main active *** heterostructure effectively decreases the formation energy of O vacancy,leading to surface reconstruction of the catalyst,further improving HER *** MoO_(x)/Ni_(3)S_(2)/NF is promising to serve as a highly effective and durable electrocatalyst toward HER.

关键词： molybdenum oxides oxygen vacancies heterostructure electrocatalysts hydrogen evolution reaction

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Phase engineering of Mo-V oxides molecular sieves for zinc-ion batteries

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Science China Materials 2022年第4期65卷 939-946页

作者： Gan Qu Chuntian Qiu Jun Wang Jiewen Tan Shuangfeng Jia Zhesheng Chen Jean-Pascal Rueff Wesley Guangyuan Zheng Chenliang Su Bingbing Tian International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen518060China College of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China Department of Chemical and Biomolecular Engineering National University of Singapore10 Kent Ridge CrescentSingapore119260Singapore School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-structuresand Institute for Advanced StudiesWuhan UniversityWuhan430072China SociétéCivile Synchrotron SOLEIL L’Ormedes MerisiersSaint-AubinBP48Gif-sur-Yvette91192France Laboratoire de Chimie Physique-Matière et Rayonnement LCPMRSorbonne UniversitéCNRSParisF-75005France

With the ever-increasing demands of grid-scale energy storage,aqueous zinc-ion batteries(ZIBs)have garnered increasing attention around the ***,limited Zn^(2+)host materials have hindered the commercialization of ***,Mo-V oxides with different phase structures(orth-,tri-,and tetra-MoVO)were precisely constructed to develop phase-dependent Mo-V oxide cathodes for Zn^(2+)storage in *** open frameworks and varied tunnel structures formed a favorable alternative for achieving suitable Zn^(2+)diffusion *** optimized phase engineering,the high specific capacity of approximately 400 mA h g^(−1) and excellent cyclic stability of 1000 cycles were achieved with orth-MoVO as the *** large amount of six-and seven-member rings in the orth-MoVO phase,which allow for alternative Zn^(2+)insertion,play a vital role in hosting Zn^(2+)ions *** proposed phase engineering strategy provides a new approach toward cathode design in ZIBs.

关键词： zinc-ion batteries phase engineering molybdenum oxides vanadium oxides