Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 160, Issue 1, Pages A93-A97Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.008302jes
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Funding
- National Nature Science Foundation of China [51102139, 50972065]
- Shenzhen Technical Plan Projects [JC201105201100A]
- Guangdong Province Innovation RD Team Plan [2009010025]
- China Postdoctoral Science Foundation [2012M510022]
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The storage process of Zn2+ ion into alpha-MnO2 has been investigated by electrochemical impedance spectrum. A new phase formation process has been recognized. The equivalent circuit model and the impedance expression have been built up to characterize the storage of Zn2+ ion into alpha-MnO2. It is found that the storage process of Zn2+ ions is mainly determined by the phase change. With the decrease of potential, Zn2+ ions begin to insert into MnO2 and phase change occurs, which leads to a significant increase on phase change resistance (R-T). We also investigated the relationship between the phase change and the phase angle. It is mathematically calculated that maximum phase angle (|Phi|(0)) at low frequency domain shows a logarithmic dependence on R-T, which is confirmed by the experimental results. By using |Phi|(0) directly from Bode plot, we can easily monitor the phase change and the storage process of zinc ion into MnO2. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.008302jes] All rights reserved.
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