Advanced Materials for Thin‐Film Solid Oxide Fuel Cells: Recent Progress and Challenges in Boosting the Device Performance at Low Temperatures

Abstract Solid oxide fuel cells (SOFCs) are efficient and flexible electrochemical energy conversion devices that can power the future green society with regards to homes, cars, even down portable electronics. They do have potential become low cost, since no noble metals used. Their broad commercialization, however, is hampered by high operating temperatures of 700–900 ° C. Lowering temperature SOFCs challenging as both charge transport in solid electrolyte oxygen exchange reactions thermally activated processes. Herein, recent progress development anode, electrolyte, cathode materials lower SOFC below 600 C summarized new opportunities, well challenges remain be solved, discussed. The focus this review addressed thin film SOFCs, sub‐micrometer ( μ SOFCs) based on microelectromechanical systems, proton‐conducting (protonic ceramic cells), which especially promising for powering devices.