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Tuning the layer structure of molybdenum trioxide towards high-performance aqueous zinc-ion batteries

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Chinese Chemical Letters 2023年第4期34卷 489-494页

作者： Yu Tan Jinjun He Bo Wang Cheng Chao Li Taihong Wang College of Materials Science and Engineering Hunan UniversityChangsha 410082China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China School of Chemistry Sun Yat-sen UniversityGuangzhou 510275China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China College of Chemistry and Materials Science Hunan Agriculture UniversityChangsha 410128China

Aqueous zinc-ion batteries(ZIBs) have attracted significant attentions because of low cost and high reliability. However, conventional ZIBs are severely limited by the development of high energy density cathode materials with reversible Zn^(2+)insertion/extraction. Herein, a conducting polymer intercalated MoO_(3)(PMO) with extensively extended interlayer spacing is developed as a high-performance ZIBs cathode material. The interlayer spacing of PMO is prominently increased which results in an improved Zn^(2+)mobility during charge and discharge process. More significantly, the electrochemical results reveals that the intercalation of PANI facilitates the charge storage and reinforces the layered structure of MoO_(3), leading to a high capacity and good cycling stability. DFT calculation further reveals the intercalation of PANI into MoO_(3)significantly lower Zn^(2+)diffusion barrier. Benefit from these advantages, the ZIBs based on PMO electrode delivers a considerable capacity of 157 m Ah/g at 0.5 A/g and ameliorative stability with 63.4%capacity retention after 1000 cycles.

关键词： molybdenum trioxide Cathode Zinc ion batteries Polyaniline intercalation Layered structure

Low-temperature Synthesis of Large-area Films of molybdenum trioxide Microbelts in Air and the Dependence of Their Field Emission Performance on Growth Conditions

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Journal of Materials Science & Technology 2010年第7期26卷 584-588页

作者： Dongmei Ban,Ningsheng Xu,Shaozhi Deng,Jun Chen and Juncong She State Key Lab of Optoelectronic Materials and Technologies,Guangdong Province Key Laboratory of Display Material and Technology,School of Physics and Engineering,Sun Yat-sen University,Guangzhou 510275,China State Key Lab of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and Technology School of Physics and Engineering Sun Yat-sen University Guangzhou 510275 China

A simple method is introduced for the preparation of large-area films of molybdenum trioxide （MoO3） microbelts. It is found that such films can be grown on indium tin oxide （ITO） glasses or silicon substrates at low temperatures by thermal evaporation deposition in air without using catalyst. Field emission measurements show that the turn-on field of the MoO3 microbelts is as low as 2.2 V/μm required to obtain a current density of 10 μA/cm^2, The combination of the simplicity of the growth method and the attractive field emission performance makes it a potential low-cost technique for the preparation of large-area field emission cold cathode material.

关键词： Field emission Large-area film molybdenum trioxide Microstructures and synthesis

Solid-gas Phase Preparation Method for Porous molybdenum trioxide

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Journal of Wuhan University of Technology(Materials Science) 2020年第3期35卷 495-500页

作者：任婕 MU Shichun YANG Daohe LI Xuejing DONG Shengqi ZHU Junwei LIN Xianghai 董学斌 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Wuhan Construction Engineering Safety Supervision Station Wuhan 430015China School of Civil Engineering Wuhan Univer-sityWuhan 430072China

A novel solid-gas reaction preparation technology was used to adjust the composition and microstructure of the composite crystal materials by changing the preparation parameters. Compared with the commonly used sol-gel method, acid base neutralization sedimentation method, hydrothermal method, and gas phase deposition method, the technology was relatively simplified and the elemental composition was controllable, without the use of openings and additives. A kind of multi-element composite porous metal oxide was obtained by pre-intercalation and decarburization. In order to increase the porosity of MoO3 material and promote the adsorption and diffusion of reactant molecules, the microstructure of MoO3 was studied. The preparation process of porous molybdenum trioxide by solid gas combination process was discussed, which provides an innovative idea for the design and preparation of new materials with a large specific surface area and other desirable properties.

关键词： molybdenum trioxide porous structure solid-gas phase method synthetic

Reduction characteristics of molybdenum trioxide with aluminum and silicon

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Rare Metals 2018年第7期37卷 621-624页

作者： Hang-Yu Zhu Rong Gao Wu-Tao Jin Long-Wu Qiu Zheng-Liang Xue State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology School of Materials and Metallurgy Wuhan University of Science and Technology

Thermodynamics for reduction of molybdenum oxides by aluminum and silicon were calculated, and the results show that reduction reaction is feasible at a certain temperature region. Compared to the presence of CaO or CaCO3, reduction products of molybdenum trioxide with aluminum and silicon at various temperatures were detected by X-ray diffraction （XRD）. Results show that molybdenum trioxide is reduced by aluminum or silicon step by step, and the intermediate product is MOO2. At 1000 ℃, molybdenum trioxide could be reduced to metal Mo by aluminum, and in the presence of CaO, metal Mo as the reduction product appears even at 800 ℃. In contrast, silicon could barely reduce molybdenum trioxide to metal Mo even at 1200℃. In the presence of CaO or CaCO3, reducibility of silicon increases significantly, and the reduction products are metal Mo and MoSi2. Altogether, CaO or CaCO3 performs two major roles in reduction process： restraining sublimation of MoO3 and decreasing the temperature of reducing MoO3 to metal Mo.

关键词： molybdenum trioxide Reduction Aluminum Silicon Metallothermic

Realizing the Long Lifespan of molybdenum trioxide in Aqueous Aluminum Ion Batteries Through Potential Regulation

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Renewables 2023年第4期1卷 455-464页

作者： Haodong Fan Xuejin Li Jie Zhou Xiaoning Wang Xiuli Gao Haoyu Hu Li Zhou Tonghui Cai Yongpeng Cui Pengyun Liu Qingzhong Xue Zifeng Yan Wei Xing State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of PetroleumQingdao 266580

MoO_(3) is one of the most promising anode materials for aqueous aluminum batteries due to its high theoretical capacity and suitable aluminum insertion/de-insertion potential.However,the inferior cycling stability limits its further application,and the failure mechanism is still unclear.In this article,we provide a straightforward potential regulation technique to manage phase evolution during the charge/discharge process,which ultimately results in a markedly enhanced MoO_(3) electrode cycling stability.The failure mechanism study reveals that the excessive oxidation of the electrode during charge/discharge generates the H_(0.34)MoO_(3) phase,which has high solubility and is the primary cause of MoO_(3) deactivation.Although the dissolved Mo species will be deposited onto the electrode sheet again,the deposition is not electrochemically active and cannot contribute to the capacitance.Controlling the cutoff potential prevented the production of H_(0.34)MoO_(3),resulting in excellent cycling performance(80.1% capacity retention after 4000 cycles).The as-assembled α-MoO_(3)//MnO_(2) full battery exhibits high discharge plateaus(1.4 and 0.9 V),large specific capacity(200 mAhg^(-1) at 2 Ag^(-1)),and ultra-high coulombic efficiency(99%).The research presented here may contribute to the development of highly stable electrode materials for aqueous batteries.

关键词： aqueous aluminum ion battery molybdenum trioxide potential regulation aqueous battery anode

Dispersion and Structure Studies of molybdenum Oxide on Anatase TiO_2

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Chemical Research in Chinese Universities 2004年第6期20卷 685-689页

作者： ZIFeng-lan GUOHong-you WUNian-zu XIEYa-ning HUTian-dou DepartmentofAppliedChemistry BeijingUniversityofChemistryandTechnologyBeijing100029P.RChina StateKeyLaboratoryforStructuralChemistryofUnstable~StableSpecies InstituteofPhysicalChemistryPekingUniversityBeijing100871P.R.China SynchrotronRadiationLaboratory InstituteofHighEnergyPhysicsBeijing100039P.R.China

X-ray photoelectron spectroscopy(XPS) and extended X-ray absorption fine structure(EXAFS) were used to characterize the structure of the mixture of molybdenum oxide and anatase calcined at 723 K. The results indicate that molybdenum oxide can disperse onto the surface of anatase(TiO 2) and the dispersion threshold is 11.2 mg in per gram of MoO 3 or 4.8 Mo atoms/nm 2 TiO 2. When the content of MoO 3 is below the dispersion threshold, MoO 3 species is in highly dispersed state interacting strongly with TiO 2 support and in discrete tetrahedral coordination, [MoO 4], on the surface of TiO 2. When the MoO 3 loading is above this value, MoO 3 exists in both dispersed phase and crystalline phase. MoO 3 in dispersed phase is still a discrete [MoO 4] tetrahedron; MoO 3 in crystal phase is in octahedral coordination.

关键词： molybdenum trioxide Anatase Dispersion

SO_2-tolerant Pt-MoO_3/C catalyst for oxygen reduction reaction

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Journal of Energy Chemistry 2014年第3期23卷 358-362页

作者： Xiao Liu Hongmin Wang Siguo Chen Xueqiang Qi Huiliang Gao Yi Hui Yang Bai Lin Guo Wei Ding Zidong Wei The State Key Laboratory of Power Transmission Equipment & System Security and New Technology School of Chemistry and Chemical EngineeringChongqing University Wuhan Sanjiang Aerospace Yuanfang Technology CO.LTD.

A Pt-MoO3/C catalyst,aimed to eliminate the harmful effect of sulfur dioxide（SCb） on the performance of Pt nanoparticles（NPs） for catalysis of oxygen reduction reaction（ORR） in proton exchange membrane fuel cells（PEMFC）,is developed and characterized by TEM,XRD and XPS.The results reveal that Pt-MoO3/C catalyst exhibits not only a higher catalytic activity,but also a better SO2 poisoning resistance and a better recovery performance than the commercial Pt/C catalyst does.

关键词： platinum molybdenum trioxide sulfur dioxide oxygen reduction reaction fuel cell

Carbothermic Reduction of MoO_3 for Direct Alloying Process

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Journal of Iron and Steel Research(International) 2013年第10期20卷 51-56页

作者： ZHU Hang-yu LI Zheng-bang YANG Hai-sen LUO Lin-gen Department of Metallurgical Technology Central Iron and Steel Research Institute

The thermodynamics of Mo-O- C and Ca-Mc-O-C systems was studied in order to understand the carbothermic reduction of molybdenum trioxide, and kinetic studies were also carried out by means of thermogravimetrie analysis under argon atmosphere with a heating rate of 10 ℃/min. Subsequently, reaction products at various temperatures were identified by X-ray diffraction （XRD） and the results confirmed the previous thermodynamics analysis. Mean- while, it was found that intermediate products MoO2 and CaMoO4 appeared in the process of carbothermic reduction of MoO3 with or without CaO, which were subsequently reduced to Mo or molybdenum carbide. An experimentally determined reaction mechanism was proposed and discussed. The reduction reaction of MoO3 with carbon could be divided into two stages. The first stage includes the direct reaction between MoO3 and carbon and the carbon gasifica- tion reaction. The second stage is the gas-solid reaction between CO and MoO2, and the diffusion of gases through the surface of MoO2 determines the overall reaction rate. The activation energies of the mixtures with or without CaO were estimated to be 56.6 and 52.9 kJ/mol, respectively.

关键词： carbothermic reduction molybdenum trioxide stabilizing calcium oxide

ZB/MoO3复配型阻燃抑烟剂对PVC抑烟行为的影响

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ZB/MoO3复配型阻燃抑烟剂对PVC抑烟行为的影响