Review on Ruddlesden-Popper perovskites as cathode for solid oxide fuel cells

Solid oxide fuel cells (SOFC) are highly efficient energy conversion device, but its high operating temperature (800 similar to 1000 degrees C) restricts industrial commercialization. Reducing the operating temperature to <800 degrees C could broaden the selection of materials, improve the reliability of the system, and lower the operating cost. However, traditional perovskite cathode could not both attain the high catalytic activity towards the oxygen reduction reaction and good durability at medium and low temperature range. In contrast to the conventional perovskites, Ruddlesden-Popper perovskites exhibit fast oxygen surface exchange kinetic and excellent stability at medium and low temperatures, and excel both in oxide-conducting fuel cells (O-SOFC) and proton-conducting fuel cells (H-SOFC). In this paper, we try to relate its prominent performance with the crystal structure, main physical properties, and transport mechanism of oxygen ions and protons. We also summarize the current strategy in improving its application in O-SOFC and H-SOFC. Finally, we discuss the challenges and outlook for the future development of RP perovskites in SOFC.

Automated summary

Solid oxide fuel cells (SOFC) are limited by high operating temperatures, but reducing the temperature can improve efficiency. Ruddlesden-Popper perovskites show excellent performance at medium and low temperatures, with potential applications in both oxide-ion and proton-conducting fuel cells.