Siam Physics Congress 2015

May 20 – 22, 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

*In situ* XANES Study of MnO${}_2$ Electrode for Supercapacitors

May 20, 2015, 2:15 PM
15m
Phokheetara Grand Ballroom

Phokheetara Grand Ballroom

Oral presentation Material Physics, Nanoscale Physics and Nanotechnology

Speaker

Ms Piramon Hampitak (Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Description

Manganese dioxide (MnO${}_2$) is one of the most studied electrode materials for use in supercapacitors due to its distinguished properties such as high specific capacitance, environmental compatibility, and low cost. In this study, local and electronic structures of Mn in MnO${}_2$ electrode have been investigated by in situ X-ray absorption spectroscopy technique. *In situ* Mn *K*-edge XANES spectra measured during constant voltage charge-discharge processes within the potential window of 0-1 V were recorded. The results (Fig. 1) show some little changing of the oxidation state of Mn because of redox reaction on only the surface of electrode. This result indicates that within this potential window, ideal capacitive behavior or surface redox reaction occurs, and the intercalation does not occur. ![Fig.1 Mn K-edge XANES spectra][1] [1]: https://drive.google.com/file/d/0Bx8ij8NCt4nBVzRvV014NXFNeUE/preview

Primary author

Ms Piramon Hampitak (Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Co-author

Prof. Nonglak Meethong (Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

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