Mixed ion and electron transport theory and application in solid oxide conductors

Kevin Huang

doi:10.1007/s12613-021-2401-4

Volume 29 Issue 4

Apr. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(4): 870-875

Kevin Huang, Mixed ion and electron transport theory and application in solid oxide conductors, Int. J. Miner. Metall. Mater., 29(2022), No. 4, pp. 870-875. https://doi.org/10.1007/s12613-021-2401-4

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Kevin Huang, Mixed ion and electron transport theory and application in solid oxide conductors, Int. J. Miner. Metall. Mater., 29(2022), No. 4, pp. 870-875. https://doi.org/10.1007/s12613-021-2401-4

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Invited Review

Mixed ion and electron transport theory and application in solid oxide conductors

Kevin Huang

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Corresponding author:
Kevin Huang E-mail: huang46@cec.sc.edu
Received: 26 October 2021; Revised: 30 November 2021; Accepted: 20 December 2021; Available online: 25 December 2021

Abstract

Abstract

Mixed ions and electron conductors (MIECs) are an important family of electrocatalysts for electrochemical devices, such as reversible solid oxide cells, rechargeable metal–air batteries, and oxygen transport membranes. Concurrent ionic and electronic transports in these materials play a key role in electrocatalytic activity. An in-depth fundamental understanding of the transport phenomena is critically needed to develop better MIECs. In this brief review, we introduced generic ionic and electronic transport theory based on irreversible thermodynamics and applied it to practical oxide-based materials with oxygen vacancies and electrons/holes as the predominant defects. Two oxide systems, namely CeO₂-based and LaCrO₃-based materials, are selected as case studies to illustrate the utility of the transport theory in predicting oxygen partial pressure distribution across MIECs, electrochemical electronic/ionic leakage currents, and the effects of external load current on the leakage currents.
- irreversible thermodynamics;
- diffusivity;
- charge neutrality;
- electrochemical potential;
- electrostatic potential

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References

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