Pseudocapacitance of MnO2 originates from reversible insertion/desertion of thiocyanate anions studied using in situ X-ray absorption spectroscopy in ionic liquid electrolyte

Ming Tsung Lee, Wen Ta Tsai, Ming Jay Deng, Hui Fang Cheng, I. Wen Sun, Jeng-Kuei Chang*

*此作品的通信作者

研究成果: Article同行評審

34 引文 斯高帕斯(Scopus)

摘要

Charge storage mechanisms of electrodeposited MnO2 in various aprotic ionic liquids (ILs) are studied using in situ X-ray absorption spectroscopy (XAS). The analytical results show that a unique thiocyanate (SCN-) anion can reversibly insert/desert into/from the tunnels between the [MnO6] octahedral subunits depending on the applied potential. This process charge compensates the Mn3+/Mn4+ redox transition upon charging-discharging and thus contributes to an ideal pseudocapacitive behavior of the MnO2 electrode. The present work would open up a route for developing a novel oxide-based supercapacitor, with high cell-voltage, high thermal stability, and high safety, incorporating IL electrolytes.

原文English
頁(從 - 到)919-922
頁數4
期刊Journal of Power Sources
195
發行號3
DOIs
出版狀態Published - 1 2月 2010

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