- Title
- Electrochemical characterization of proton diffusion during discharge and cycling of γ-MnO₂
- Creator
- Bailey, Mark R.; Donne, Scott W.
- Relation
- Journal of the Electrochemical Society Vol. 160, Issue 11, p. A2070-A2077
- Publisher Link
- http://dx.doi.org/10.1149/2.042311jes
- Publisher
- Electrochemical Society
- Resource Type
- journal article
- Date
- 2013
- Description
- In this work step potential electrochemical spectroscopy (SPECS) and electrochemical impedance spectroscopy (EIS) are used to examine the γ-MnO₂ electrode and provide two distinct measurements of proton diffusivity during the discharge and cycling of γ-MnO₂. This is carried out by modeling the electrochemical data assuming solid-state spherical diffusion (in the case of SPECS) and by using an equivalent circuit approach (in the case of EIS). In both cases an outline of the model employed and the details of the fitting process are included. The resulting A√D values are then considered and any changes noted during discharge or cycling, along with the variation observed between the two techniques, are explained in terms of the structural and morphological changes which the material undergoes. A key finding from these studies is that SPECS characterizes bulk diffusional processes, while EIS focuses on near-surface (<1 nm deep) processes.
- Subject
- electrochemical spectroscopy (SPECS); electrochemical impedance spectroscopy (EIS); proton diffusion
- Identifier
- http://hdl.handle.net/1959.13/1056678
- Identifier
- uon:16071
- Identifier
- ISSN:0013-4651
- Rights
- © The Electrochemical Society, Inc. 2013. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of the Electrochemical Society, Vol. 160, No. 11, pp. A2070-A2077.
- Language
- eng
- Full Text
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