Gravimetric/volumetric capacitances, leakage current, and gas evolution of activated carbon supercapacitors

Quoc Dat Nguyen, Yi Hsuan Wu, Tzi Yi Wu, Ming Jay Deng, Cheng Hsien Yang*, Jeng-Kuei Chang

*此作品的通信作者

研究成果: Article同行評審

29 引文 斯高帕斯(Scopus)

摘要

The impurity level, surface functional group concentration, and specific surface area of activated carbons (ACs) are manipulated via acid rinsing, post heat treatment, and activation time, respectively. The effects of these factors on the electrode gravimetric/volumetric capacitances, leakage current, and gas evolution amount in 1 M triethylmethylammonium tetrafluoroborate/propylene carbonate electrolyte are systematically investigated. The impurity and surface functional groups do not significantly influence the electrode capacitances (regardless of charge–discharge rates), but increase the leakage current and gas evolution amount of the constructed supercapacitors. Increasing the specific surface area of ACs increases the capacitor gravimetric energy density and power density, but decreases the corresponding volumetric performance. The cyclic stability of various ACs is evaluated at 25 and 70 °C. Property variations of the electrodes upon cycling are examined using scanning electron microscopy and electrochemical impedance spectroscopy.

原文English
頁(從 - 到)1153-1159
頁數7
期刊Electrochimica Acta
222
DOIs
出版狀態Published - 20 12月 2016

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