Cobalt in Nitrogen-Doped Graphene as Single-Atom Catalyst for High-Sulfur Content Lithium−Sulfur Batteries
學年 107
學期 2
出版（發表）日期 2019-02-14
作品名稱 Cobalt in Nitrogen-Doped Graphene as Single-Atom Catalyst for High-Sulfur Content Lithium−Sulfur Batteries
作品名稱（其他語言）
著者 Zhenzhen Du; Xingjia Chen; Wei Hu; Chenghao Chuang; Shuai Xie; Ajuan Hu; Wensheng Yan; Xianghua Kong; Xiaojun Wu; Hengxing Ji; Li-Jun Wan
單位
出版者
著錄名稱、卷期、頁數 Journal of American Chemical Society 141(9), p.3977–3985
摘要 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.
關鍵字
語言 en_US
ISSN 00027863
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 *kongxh@hfut.edu.cn. (X.-h.K.) *xjwu@ustc.edu.cn. (X.-j.W.) *jihengx@ustc.edu.cn. (H.-x.J.)
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/116560 )