Oxidation of metallic Mn thin films prepared in butyimethylpyrrolidinium bis(trifluoromethyisuifony)imide ionic liquid and the pseudo-capacitive performance of the anodized oxide electrodes

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Metallic Manganese (Mn) thin films were successfully prepared by electrodeposition in butylmethylpyrrolidinium bis(trifluoromethylsulfony)imide (BMP-NTf2) ionic liquid, which has a very wide potential window extending over the reduction potential of Mn. Potentiostatic, galvanostatic, and cyclic voltammetric methods were performed to anodize the Mn films in Na 2SO4 solution. The surface morphology and crystal structure of the obtained oxides were examined by a scanning electron microscope and X-ray diffractometer, respectively. Moreover, their chemical states were also analyzed with an X-ray photoelectron spectroscopy. It was clearly confirmed that the anodization methods could affect the material characteristics of the Mn oxides and therefore their pseudo-capacitive performance. The Mn oxide anodized by the cyclic voltammetric method showed a promising specific capacitance of 355 F/g (measured in 0.1 M Na2SO4 solution at a potential scan rate of 25 mV/s). Its capacitance retained ratio after 500 charge-discharge cycles was as high as 94 %.

Original languageEnglish
Title of host publicationECS Transactions - Electrochemistry of Novel Electrode Materials for Energy Conversion and Storage
Pages165-174
Number of pages10
Edition25
DOIs
StatePublished - 22 Dec 2008
EventElectrochemistry of Novel Electrode Materials for Energy Conversion and Storage - 211th ECS Meeting - Chicago, IL, United States
Duration: 6 May 200711 May 2007

Publication series

NameECS Transactions
Number25
Volume6
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceElectrochemistry of Novel Electrode Materials for Energy Conversion and Storage - 211th ECS Meeting
CountryUnited States
CityChicago, IL
Period6/05/0711/05/07

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