Open-cell voltage and electrical conductivity of a protonic ceramic electrolyte under two chemical potential gradients
- Open-cell voltage and electrical conductivity of a protonic ceramic electrolyte under two chemical potential gradients
- 이해원; 김병국; 이종호; 김형철; 손지원; 지호일; 윤경중
- Issue Date
- Physical chemistry chemical physics : PCCP
- VOL 20, NO 22-15001
- 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.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.