Journal
MEMBRANES
Volume 11, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/membranes11100766
Keywords
triple ionic-electronic conductor; oxygen permeation membrane; electrical conductivity relaxation
Categories
Funding
- National Energy Technology Laboratory (NETL)
- Oak Ridge Institute for Science and Education (ORISE)
- U.S. Department of Energy
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Y substitution increases lattice size and forms oxygen vacancies, resulting in a decrease in oxygen permeation flux and DC total conductivity. However, Y-doped samples show an order of magnitude increase in surface exchange rates compared to Zr-doped samples.
Triple ionic-electronic conductors have received much attention as electrode materials. In this work, the bulk characteristics of oxygen diffusion and surface exchange were determined for the triple-conducting BaCo0.4Fe0.4Zr0.2-XYXO3-delta suite of samples. Y substitution increased the overall size of the lattice due to dopant ionic radius and the concomitant formation of oxygen vacancies. Oxygen permeation measurements exhibited a three-fold decrease in oxygen permeation flux with increasing Y substitution. The DC total conductivity exhibited a similar decrease with increasing Y substitution. These relatively small changes are coupled with an order of magnitude increase in surface exchange rates from Zr-doped to Y-doped samples as observed by conductivity relaxation experiments. The results indicate that Y-doping inhibits bulk O2- conduction while improving the oxygen reduction surface reaction, suggesting better electrode performance for proton-conducting systems with greater Y substitution.
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