Abstract
To obtain BaZrO3-based electrolyte materials with both good sinterability and high proton conductivity, a Cu-doped B-site BaZr0.5Ce0.3Y0.2-xCuxO3-δ (BZCYCux; x = 0, 0.05, 0.1) system is designed and synthesized. The effects of Cu doping on the crystal structure, sintering and electrical properties of BZCYCux are systematically investigated. The BZCYCu0.05 sample demonstrates the highest sintering density and total conductivity among the studied materials. BZCYCu0.05 can be densified at 1250 °C, which is 300 °C lower than that for unmodified BZCY. The calculated results suggest that the increased conductivity in BZCYCu0.05 benefits from a high apparent specific grain-boundary conductivity, which originates from a small space-charge potential and a large clean part of impurities in the electrolyte. A synthetic analysis based on impedance spectroscopy and distribution of relaxation time further confirms that BZCYCu0.05 is more conductive. A single cell built using the BZCYCu0.05 (∼46 μm) electrolyte shows an excellent power density of 258 mW cm−2 at 700 °C. These results indicate that BZCYCu0.05 is a potential proton conductor for use in protonic ceramic fuel cells.
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