Electrochemical characterization of BaCe0.7Zr0.1Y0.16Zn0.04O3-δ electrolyte synthesized by combustion spray pyrolysis

BaCe0.7Zr0.1Y0.16Zn0.04O3-delta perovskite has been investigated due to its potential as an electrolyte in industrial steam electrolysis applications. The lowest area specific resistance (ASR) is achieved as 4.0 Omega cm2 at 711 degrees C under 3% wet Ar atmosphere. The conductivity is calculated as 2.93 x 10-2 S cm 1 and kept stable for a-70 h testing period. ASR increased at lower temperature (511 degrees C) under the same atmosphere and a new impedance arc (with 4.5 Omega cm2 ASR and 2 x 10-8 F equivalent capacitance) is formed, indicating second phase formation. No second phase formation is observed at the same temperature under dry 5% H2 in Ar. The second phase formation/degradation of the electrolyte is attributed to Ba(OH)2 and CeO2 formations around 500 degrees C under wet atmospheres. At elevated temperatures,-700 degrees C, BaCe0.7Zr0.1Y0.16Zn0.04O3-delta exhibits both excellent protonic conductivity and stability which makes it a great candidate for both industrial fuel cells and steam electrolysers.