High Performance Proton-Conducting Solid Oxide Fuel Cells with a Layered Perovskite GdBaCuCoO5+x Cathode
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Proton-conducting solid oxide fuel cell (H-SOFC) based on layered perovskite type GdBaCuCoO5+x (GBCC) cathode was fabricated with in situ drop-coating BaZr0.1Ce0.7Y0.2O3−δ (BZCY) electrolyte membrane. The influences of Cu doping into Co sites of GdBaCo2O5+x on the electrical conductivity and conduction mechanism, thermal expansion property and electrochemical performance of cathode materials and corresponding single cell were investigated. Results show that the electrical conductivity decreased and the conduction mechanism would gradually transform to the semiconductor-like behavior. A high maximum power density of 480 mW cm−2 was obtained for the anode supported NiO–BZCY/NiO–BZCY/BZCY/GBCC single cells with wet H2 fuel at 700 °C. The corresponding polarization resistance was as low as 0.17 Ω cm2. The excellent electrochemical performance of as-prepared single cell indicates that GBCC is a good candidate of cathode materials for H-SOFCs.
KeywordsProton-conducting solid oxide fuel cells Cathode materials Electrical conductivity behavior Thermal expansion Electrochemical performance
The authors would like to thank the financial support from the National Natural Science Foundation of China (Nos. 51462012 and 51462011) and Jiangxi Provincial Department of Education, China (KJLD14076).
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