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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/116560


    Title: Cobalt in Nitrogen-Doped Graphene as Single-Atom Catalyst for High-Sulfur Content Lithium−Sulfur Batteries
    Authors: Zhenzhen Du;Xingjia Chen;Wei Hu;Chenghao Chuang;Shuai Xie;Ajuan Hu;Wensheng Yan;Xianghua Kong;Xiaojun Wu;Hengxing Ji;Li-Jun Wan
    Date: 2019-02-14
    Issue Date: 2019-05-08 12:10:20 (UTC+8)
    Abstract: Because of their high theoretical energy density and low cost, lithium–sulfur (Li–S) batteries are promising next-generation energy storage devices. The electrochemical performance of Li–S batteries largely depends on the efficient reversible conversion of Li polysulfides to Li2S in discharge and to elemental S during charging. Here, we report on our discovery that monodisperse cobalt atoms embedded in nitrogen-doped graphene (Co–N/G) can trigger the surface-mediated reaction of Li polysulfides. Using a combination of operando X-ray absorption spectroscopy and first-principles calculation, we reveal that the Co–N–C coordination center serves as a bifunctional electrocatalyst to facilitate both the formation and the decomposition of Li2S in discharge and charge processes, respectively. The S@Co–N/G composite, with a high S mass ratio of 90 wt %, can deliver a gravimetric capacity of 1210 mAh g–1, and it exhibits an areal capacity of 5.1 mAh cm–2 with capacity fading rate of 0.029% per cycle over 100 cycles at 0.2 C at S loading of 6.0 mg cm–2 on the electrode disk.
    Relation: Journal of American Chemical Society 141(9), p.3977–3985
    DOI: 10.1021/jacs.8b12973
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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