Recently, the team of Researcher Liu Jian from the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences and 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 have prepared an N-doped hollow porous carbon loaded Co single-atom nanoreactor ( CoSA-HC). 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 a new idea for the design of metal-chalcogenide battery (MCB) electrodes .
Jian Liu’s team has been committed to in-depth research on the basic theory of catalysis in micro/nano reactors for a long time to achieve precise positioning of the active components in the nano reactor. In the preliminary work, the team cooperated with the team of Wu Zhongshuai, a researcher from Dalian Institute of Physics, and developed a porous carbon ball nanoreactor supported by Fe1-xS nanoparticles as the cathode substrate of lithium-sulfur batteries, achieving a current density of 0.5C. The capacity is maintained at 1070mAh/g for 200 cycles with almost no degradation (Advanced Energy Materials 2020). The Se positive electrode has good electronic conductivity, which is equivalent to the volume capacity of the S positive electrode. 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.
In this study, the researchers used the unique electronic structure of single-atom catalysts, excellent atom utilization efficiency and catalytic performance, and synthesized N by using PVP-modified PS as a template to adjust the Co and Zn content in the bimetallic ZnCo-ZIFs precursor. Doped hollow porous carbon-supported Co single atom (CoSA-HC) nanoreactor. 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 Quality effect and inhibit the volume expansion caused by the reaction process.
Related 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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