Functional Group-Dependent Supercapacitive and Aging Properties of Activated Carbon Electrodes in Organic Electrolyte

Cheng Hsien Yang, Quoc Dat Nguyen, Ting Hao Chen, Ahmed S. Helal, Ju Li, Jeng-Kuei Chang*

*此作品的通信作者

研究成果: Article同行評審

38 引文 斯高帕斯(Scopus)

摘要

The concentrations of surface functional groups on activated carbon (AC) are manipulated via heat treatment at various temperatures. The carboxyl (O-C = O) population clearly decreases at 600 °C, whereas the lactone (RO-C = O) and phenol (C-OH) populations decrease if the temperature exceeds 750 °C. Their effects on electrode capacitance, leakage current, and gas evolution are systematically investigated in 1 M tetraethylammonium tetrafluoroborate/propylene carbonate electrolyte. The assembled symmetric supercapacitors are also subjected to an aging test, where the cells are held at 2.5 V and 70 °C. The decreased functional group populations significantly reduce gassing and improve the cell durability; the mechanisms are explored using electrochemical impedance spectroscopy and post-mortem SEM. Nevertheless, the AC surface area drops dramatically at 850 °C, resulting in a considerable reduction in capacitance. A rational control of heat-treatment temperature is critical for obtaining AC with balanced supercapacitor performance.

原文English
頁(從 - 到)1208-1214
頁數7
期刊ACS Sustainable Chemistry and Engineering
6
發行號1
DOIs
出版狀態Published - 2 1月 2018

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