水溶液
锌
电解质
吸附
兴奋剂
电池(电)
碘
材料科学
溶解
化学
电化学
无机化学
化学工程
碳纤维
电极
光电子学
冶金
物理化学
复合数
功率(物理)
复合材料
工程类
物理
量子力学
作者
Donglin Yu,Anuj Kumar,Tuan Anh Nguyen,M. Tariq Nazir,Ghulam Yasin
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2020-08-06
卷期号:8 (36): 13769-13776
被引量:155
标识
DOI:10.1021/acssuschemeng.0c04571
摘要
The rechargeable aqueous zinc–iodine (Zn–I2) battery has emerged as a promising electrochemical energy storage technology. However, poor cycling stability caused by the dissolution of iodine species into the electrolyte limited its practical application. Herein, we report a nitrogen-doped porous carbon (NPC) material in gram scales. Performed as an iodine host in the Zn–I2 battery, the NPC shows a high specific capacity (345.3 mAh g–1 at 0.2 C), superior rate capability (53.2% capacity retention at 10 C), and remarkable cycling stability (10 000 cycles at 10 C with a capacity retention of 80.9%). More importantly, DFT computations reveal that the graphitic-N (N-Q) exhibits the strongest adsorption of iodine; however, pyridinic-N (N-6) shows the weakest adsorption of iodine. Moreover, the N-6/N-Q ratio is an essential parameter that significantly determined the electrochemical performance of Zn–I2 batteries. Therefore, the improved long-term cycling stability and rate capability of the as-designed Zn–I2 battery are attributable to the decrease of the N-6/N-Q ratio. This work is of great significance for devolving highly reversible Zn–I2 batteries.
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