教師資料查詢 | 類別: 期刊論文 | 教師: 莊程豪CHENG-HAO CHUANG (瀏覽個人網頁)

標題：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
語言英文(美國)
ISSN00027863
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.)
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