1. Electrophoretically deposited manganese oxide coatings for supercapacitor application
- Author
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Chen, Chin-Yi, Wang, Sheng-Chang, Lin, Chia-Yen, Chen, Fan-Shiong, and Lin, Chung-Kwei
- Subjects
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ELECTROPHORESIS , *MANGANESE oxides , *SURFACE coatings , *SUPERCAPACITORS , *ELECTRODES , *X-rays , *SPECTRUM analysis - Abstract
Abstract: In the present study, manganese oxide electrodes with promising pseudo-capacitive properties were prepared by electrophoretic deposition (EPD) using needle-like manganese dioxide powders. As-deposited coating exhibited a porous microstructure where the size and shape of the starting powders can be observed. The electrochemical performance of the as-deposited coating was then evaluated by cyclic voltammetry (CV) up to 300 times. The initial specific capacitance was 236F/g which dropped to 200F/g after 25 CV tests, and decreased gradually to 190F/g thereafter. The electrochemical behaviors during EPD and CV were examined by synchrotron X-ray absorption spectroscopy techniques from which it was deciphered that a reduction reaction from Mn4+ to Mn3+ occurred during EPD concomitant with re-oxidization during repetitive CV cycles. [Copyright &y& Elsevier]
- Published
- 2009
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