Open-cell voltage and electrical conductivity of a protonic ceramic electrolyte under two chemical potential gradients

Title
Open-cell voltage and electrical conductivity of a protonic ceramic electrolyte under two chemical potential gradients
Authors
이해원김병국이종호김형철손지원지호일윤경중
Issue Date
2018-06
Publisher
Physical chemistry chemical physics : PCCP
Citation
VOL 20, NO 22-15001
Abstract
BaZr0.8Y0.2O3d, which is a proton-conducting oxide used as an electrolyte for protonic ceramic fuel cells (PCFCs), possesses two mobile ionic charge carriers— oxygen ions and protons— in a crystalline lattice below 500 8C. The equilibrium concentrations of these charge carriers are dependent on water activity. This feature induces a complexity in the distribution of charge carriers within the electrolyte under the influence of the two chemical potential gradients of oxygen and water, which is a typical operating condition in PCFCs. This makes the theoretical derivations of the opencell voltage and the electrical resistance of the electrolyte difficult. Here, we calculate the distributions of oxygen vacancies and protons across the electrolyte by solving diffusion equations based on the defect chemistry of BaZr0.8Y0.2O3d at 500 8C. We then extract the theoretical open-cell voltage and electrical conductivity of the electrolyte in a range of water and oxygen activities that is of interest for PCFCs.
URI
http://pubs.kist.re.kr/handle/201004/67699
ISSN
1463-9076
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