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Electrochemical characterization of MnO_2 as electrocatalytic energy material for fuel cell electrode

燃料化学学报 2015年第3期43卷 344-351页

作者： Subir Paul Asmita Ghosh Department of Metallurgical and material Engineering Jadavpur University

Development of inexpensive non Pt based high electrocatalytic energy materials is the need of the hour for fuel cell electrode to produce clean alternative green energy from synthesized bio alcohol using biomass. MnO 2,electro synthesized at different current density is found to be well performed electrocatalytic material,comparable to Pt,with higher current density,very lowovervoltage for the electrochemical oxidation of methanol. From EIS study,the polarization resistance of the coated MnO 2is found to be much lowand electrical double layer capacitance is high,the effect increases with increase in current density of electro deposition. XRD,EDX and AAS analysis confirm the M nO 2deposition. The morphology of SEM images exhibits an enhanced 3D effective substrate area,for electro oxidation of the fuel. A fewnano structured grains of the deposited M nO 2is also observed at higher current density. The fact supports that a high energetic inexpensive electro catalytic material has been found for fuel cell electrode to synthesis renewable energy from methanol fuel.

关键词： electro catalytic energy material fuel cell impedance polarization electro coating

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Liquid metal material genome： Initiation of a new research track towards discovery of advanced energy materials

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Frontiers in energy 2013年第3期7卷 317-332页

作者： Lei WANG Jing LIU Key Laboratory of Cryogenics and Beijing Key Laboratory ofCryoBiomedical Engineering Technical Institute of Physics andChemistry Chinese Academy of Sciences Beijing 100190 China Department of Biomedical Engineering School of Medicine Tsinghua University Beijing 100084 China

As the basis of modern industry, the roles materials play are becoming increasingly vital in this day and age. With many superior physical properties over conventional fluids, the low melting point liquid metal material, especially room-temperature liquid metal, is recently found to be uniquely useful in a wide variety of emerging areas from energy, electronics to medical sciences. However, with the coming enormous utilization of such materials, serious issues also arise which urgently need to be addressed. A biggest concern to impede the large scale application of room-temperature liquid metal technologies is that there is currently a strong shortage of the materials and species available to meet the tough requirements such as cost, melting point, electrical and thermal conductivity, etc. Inspired by the material Genome Initiative as issued in 2011 by the United States of America, a more specific and focused project initiative was proposed in this paper--the liquid metal material genome aimed to discover advanced new functional alloys with low melting point so as to fulfill various increasing needs. The basic schemes and road map for this new research program, which is expected to have a worldwide significance, were outlined. The theoretical strategies and experimental methods in the research and development of liquid metal material genome were introduced. Particularly, the calculation of phase diagram （CALPHAD） approach as a highly effective way for material design was discussed. Further, the first-principles （FP） calculation was suggested to combine with the statistical thermo- dynamics to calculate the thermodynamic functions so as to enrich the CALPHAD database of liquid metals. When the experimental data are too scarce to perform a regular treatment, the combination of FP calculation, cluster variation method （CVM） or molecular dynamics （MD）, and CALPHAD, referred to as the mixed FP-CVM- CALPHAD method can be a promising way to solve the problem. Except for th

关键词： liquid metal material genome energy material material discovery advanced material room-tempera- ture liquid alloy thermodynamics phase diagram

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Optimum Preparation Conditions of LiNi_(0.8)Co_(0.2)O_2 and LiNi_(0.95)Ce_(0.05)O_2 as Lithium-Ion Battery Cathode materials

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Journal of Rare Earths 2004年第5期22卷 644-648页

作者：豆志河张廷安侯闯 School of materials & Metallurgy Northeastern University Shenyang 110004 China

The preparation of LiNi_(0.8)Co_(0.2)O_2 was discussed by the multiply sintering method for solid reaction, in which the sintered material was smashed, ground and pelletted between two successive sintering steps. The optimum technological condition was obtained through orthogonal experiments by L_9(3~4) and DTA analysis. The result indicates that the factors of effecting the electrochemical properties of synthesized LiNi_(0.8)Co_(0.2)O_2 are molar ratio of Li/Ni/Co, oxygen pressure, homothermal time, the final sintering temperature in turn according to its importance. The oxygen pressure is reviewed independently and the technological condition is further optimized. With the same method, rare earth element Ce was studied as substitute element of Co and the cathode material of LiNi_(0.95)Ce_(0.05)O_2 with excellent electrochemical properties was prepared. The electrochemical testing results of LiNi_(0.8)Co_(0.2)O_2 and LiNi_(0.95)Ce_(0.05)O_2 experimental batteries show that discharge capacities of them reach 165 and 148 mAh·g^(-1) respectively and the persistence is more than 9 h at 3.7 V.

关键词： energy material lithium-ion battery cathode materials LiNi_(0.8)Co_(0.2)O_2 LiNi_(0.95)Ce_(0.05)O_2 multiple sinter method rare earths

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Toward Practical All-solid-state Batteries with Sulfide Electrolyte: A Review

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Chemical Research in Chinese Universities 2020年第3期36卷 377-385页

作者： YUAN Hong LIU Jia LU Yang ZHAO Chcnzi CHENG Xinbing NAN Haoxiong LIU Quanbing HUANG Jiaqi ZHANG Qiang Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081P.R.China Beijing Key Laboratory of Green Chemical Reaction Engineering and TechnologyDepartment of Chemical EngineeringTsinghua UniversityBeijing 100084R R.China Beijing Key Laboratory of Ligtiocellulosic Chemistty Beijing Fotvstry UniversityBeijing 100083P.R.China School of Chemical Engineering and Light lndustty Guangdong University of TechnologyGuangzhou 510006P.R.China

Sulfide-based solid-state electrolytes with ultrahigh lithium ion conductivities have been considered as the most promising electrolyte system to enable practical all-solid-state ***,the practical applications of the sulfide-based all-solid-state batteries are hindered by severe interfacial issues as well as large-scale material preparation and battery fabrication ***-involved interfacial treatments and preparation processes compatible with current battery manufacturing capable of improving electrode/electrolyte interface contacts and realizing the mass production of sulfide electrolytes and the scalable fabrication of sulfide-based battery component have attracted considerable *** this perspective,the current advances in liquid-involved treatments and processes in sulfide-based all-solid-state batteries are *** relative chemical mechanisms and existing challenges are ***,future guidance is also proposed for sulfide-based *** on the sulfide-based all-solid-state batteries,we aim at providing a fresh insight on understandings towards liquid-involved processes and promoting the development of all-solid-state batteries with higher energy density and better safety.

关键词： Sulfide electrolyte All-solid-state battery Compsite electrode Liquid-involved materials processing energy material

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