Dalian Institute of Chemical Technology and others have developed a hollow carbon ball supported Co single-atom catalyst

Article source: Dalian Institute of Chemical Physics? Recently, the team of Researcher Liu Jian from the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences collaborated with the team of Professor Song Li from the University of Science and Technology of China, Associate Professor Liu Hao from the University of Technology Sydney, and Professor Wang Guoxiu's team to prepare N-doped hollow porous cells.
Carbon-loaded Co single-atom nanoreactor (CoSA-HC)
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As the positive electrode of lithium-selenium battery, this reactor shows higher discharge capacity, better rate performance and cycle stability, and its coulombic efficiency is close to 100%, providing new ideas for the design of metal-chalcogenide battery (MCB) electrodes
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? Liu Jian's team has long been committed to in-depth research on the basic theories of catalysis in micro/nano reactors to achieve precise positioning of active components in nano reactors
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In the preliminary work, the team worked with the team of Wu Zhongshuai, a researcher at Dalian Institute of Physics, to develop a porous carbon ball nanoreactor supported by Fe1-xS nanoparticles, which was used as the cathode substrate of a lithium-sulfur battery to achieve a current density of 0.
5C.
The capacity is maintained at 1070mAh/g for 200 cycles, and there is almost no attenuation (Advanced Energy Materials 2020)
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The Se positive electrode has good electronic conductivity, which is equivalent to the volume capacity of the S positive electrode
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However, the shuttle effect of polyselenide leads to low reactivity of Se and Li and rapid capacity decay, which hinders the practical application of Li-Se batteries
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? In this study, the researchers used the unique electronic structure of single-atom catalysts, excellent atom utilization efficiency and catalytic performance, by using PVP-modified PS as a template to adjust the content of Co and Zn in the bimetallic ZnCo-ZIFs precursor to synthesize N-doped hollow porous carbon supported Co single atom (CoSA-HC) nanoreactor
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The single-atom Co site in the CoSA-HC nanoreactor can effectively activate the reactivity of selenium and fix selenium and polyselenide; the hollow structure can provide more active sites and a larger electrode/electrolyte contact area, improving transmission Qualitative effect and inhibit the volume expansion caused by the reaction process
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? Relevant research results were published in "Nature Communications", and the research work was funded by the Cooperation Fund of the Institute of Clean Energy Innovation of the Chinese Academy of Sciences.

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? Dalian Institute of Chemical Technology has developed a hollow carbon ball supported Co single-atom catalyst for Li-Se battery cathode material