Preparation of manganese thin film in toom-temperature butylmethylpyrrolidinium bis(trifluoromethylsulfony)imide ionic liquid and its application for supercapacitors

Jeng-Kuei Chang*, Wen Ta Tsai, Po Yu Chen, Chiung Hui Huang, Fu Hwa Yeh, I. Wen Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The butylmethylpyrrolidinium bis(trifluoromethylsulfony)imide (BMP- NTf2) ionic liquid was found to have a very wide potential window of 4.5 V, making it capable of being a medium for electrodepositing metallic Mn thin film. By using an electrochemical process, block manganese counter electrode was dissolved in the ionic liquid to generate divalent Mn, which was subsequently cathodically deposited on the nickel substrate. The current efficiency of this process was confirmed to be extremely high (close to 100%). The Mn thin film can be oxidized to manganese oxide by cyclic voltammetry in Na2 S O4 electrolyte. The obtained manganese oxide exhibited an excellent pseudo-capacitive performance and possessed a satisfactory specific capacitance of 265 Fg at a moderate cyclic voltammetric sweep rate of 25 mVs.

Original languageEnglish
Article number033701ESL
JournalElectrochemical and Solid-State Letters
Volume10
Issue number1
DOIs
StatePublished - 1 Jan 2007

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