| 標題：Cobalt in Nitrogen-Doped Graphene as Single-Atom Catalyst for High-Sulfur Content Lithium−Sulfur Batteries |
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| 學年 | 107 |
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| 學期 | 2 |
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| 出版（發表）日期 | 2019/02/14 |
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| 作品名稱 | Cobalt in Nitrogen-Doped Graphene as Single-Atom Catalyst for High-Sulfur Content Lithium−Sulfur Batteries |
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| 作品名稱（其他語言） | |
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| 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 |
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| 單位 | |
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| 出版者 | |
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| 著錄名稱、卷期、頁數 | J. Am. Chem. Soc. 141(9), p.3977–3985 |
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| 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. |
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| 關鍵字 | |
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| 語言 | 英文(美國) |
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| ISSN | |
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| 期刊性質 | 國外 |
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| 收錄於 | SCI; |
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| 產學合作 | |
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| 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.) |
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| 審稿制度 | 是 |
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| 國別 | 美國 |
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| 公開徵稿 | |
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| 出版型式 | ,電子版 |
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| 相關連結 | |
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