Manipulating Cathode Composition to Enhance Performance of Proton-Conducting Solid Oxide Fuel Cells Through Indium Doping

One current research direction in proton-conducting solid oxide fuel cells (H -SOFCs) focuses on developing triple-phase conducting cathodes. By optimizing the cerium and indium ratio and adjusting the phase composition of barium ferrate cathode materials, improved power density is achieved in single cells with BaCe 0.21- Fe 0.64 In 0.15 O 3- delta (BCFI15) as the cathode, reaching a peak power density of 1473 mW cm -2 at 700 degrees C. Density functional theory calculations (DFT) further support that the incorporation of indium through doping effectively reduces the energy barrier for proton transition, thereby enhancing proton absorption capability and electrochemical reactivity.