HUAN Daoming ¹, ZHANG Lu ^{1, 2}, PENG Ranran ¹, XIA Changrong ^{1, 2}
(1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering,
University of Science and Technology of China, Heifei 230026, Anhui, China; 2. Energy Materials Center,
Anhui Estone Materials Technology Co. Ltd, Hefei 230088, Anhui, China)

Abstract: Solid oxide fuel cell (SOFC) is a clean and efficient energy conversion device, whose performance is closely dependent on the oxygen reduction reaction at the cathode. The traditional high performance cathodes contained cobalt, which have several issues such as high cost, thermal expansion mismatch and poor chemical stability. Therefore, the development of cobalt-free cathode has attracted strong attention in recent years. Perovskite (ABO₃) structured SrFeO_3-δ-based oxide is a good mixed ionic-electronic conductor, which has a great potential to replace the cobalt-based materials. In this review, various elemental doping approaches are summarized, including A-site, B-site and A/B sites co-doping. The effects of doping element and content on the crystal structure, oxygen non-stoichiometric ratio, thermal expansion coefficient, electrical conductivity, oxygen transport property and electrochemical performance of SrFeO_3-δare discussed. These doping methods could be used as novel strategies for modification of new cobalt-free SOFC cathode materials.
Key words: solid oxide fuel cell; cobalt-free cathode material; perovskite oxide; SrFeO3-δ; element doping