Abstract
Exploring advanced cathode materials that have high electrochemical activity and superior thermal compatibility with other components is of great importance for the application of intermediate-temperature solid oxide fuel cells. In the present study, influences of Ca doping on electrochemical and physicochemical properties of NdBa1-xCaxCoCuO5+δ were studied systematically. A relatively low thermal expansion coefficient (16.8 × 10−6 °C−1) was obtained for the Ca-doped sample over the temperature range of 25–800 °C. Moreover, Ca doping significantly enhanced the electrochemical performance of NdBa1-xCaxCoCuO5+δ. The highest densities of power for NdBa1-xCaxCoCuO5+δ-based single cells at the temperatures of 800 °C increased from 1.42 W cm−2 for x = 0.0 to 1.84 W cm−2 for x = 0.3. This increase in electrochemical performance of NdBa1-xCaxCoCuO5+δ cathode with Ca doping can be ascribed to enhanced concentrations of oxygen vacancies and higher electrical conductivity.
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