A cobalt-free perovskite-type La_(0.6)Sr_(0.4)Fe_(0.9)Cr_(0.1)O_(3-α) cathode for proton-conducting intermediate temperature solid oxide fuel cells

摘要

A cobalt-free perovskite-type cathode material La_(0.6)Sr_(0.4)Fe_(0.9)Cr_(0.1)O_(3-α) (LSFC10) was prepared by a citric acid-nitrate process and investigated as a potential cathode material for proton-conducting intermediate-temperature solid oxide fuel cells (IT-SOFCs). The maximum conductivity of LSFC10 reached 138 S cm~(-1) under oxygen at 550 °C. A Ni-BZCY composite anode-supported proton-conducting BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3-α) (BZCY) electrolyte membrane was successfully fabricated by a simple, cost-effective spin coating process. The peak power densities of the H_2/O_2 fuel cell using BZCY electrolyte membrane, Ni-BZCY composite anode and LSFC10 cathode reached 412 mW cm~2, and the interfacial polarization resistance for the fuel cell was as low as 0.19 Ω cm~2 under open circuit conditions, at 700 °C. These results reveal LSFC10 is a suitable cathode material for proton-conducting IT-SOFCs.