Research Progress in SrTiO₃-based Fuel Electrode Materials for Reversible Solid Oxide Cells

Reversible solid oxide cells (RSOCs) could be alternately operated in SOFC/SOEC mode, which could realize sustainable cycle of clean energy and electric energy, thus realizing “peak shifting and valley filling”. Because of the advantages of high efficiency and long-time/large-scale energy storage etc., RSOCs have broad application prospects in the construction of Energy Internet. Conventional Ni-YSZ fuel electrode materials are prone to sulfur poisoning when using fuel gases containing sulfur impurities and carbon accumulation, such as hydrocarbon fuels. Strontium titanate (SrTiO₃) perovskite has been the most widely studied RSOCs fuel electrode material, due to its highly adjustable structure and properties, high structural stability and thermochemical stability, and strong anti-carbon accumulation and anti-sulfur poisoning ability.Research progress of SrTiO₃-based RSOCs fuel electrodes are reviewed, while the related mechanisms are described. The challenges of SrTiO₃-based fuel electrode in the future application of RSOCs are discussed.