期刊論文
| 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 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/116560 ) |