Reviving the activity of Si-contaminated cathodes via chloride anion doping for proton-conducting solid oxide fuel cells

Abstract Silicon contaminants, often introduced from raw materials or sealants, severely impair the performance of perovskite cathodes in proton-conducting solid oxide fuel cells (H-SOFCs). To counteract this poisoning effect, this study proposes a chloride anion doping strategy to mitigate the detrimental impact of Si contamination, using La0.5Sr0.5FeO3 (LSF) as a case study. While Si doping increases the oxygen vacancy formation energy and slows oxygen/proton transport in LSF, the co-incorporation of Cl− effectively reverses these adverse changes. Cl doping expands the lattice, promotes charge redistribution, and significantly reduces the energy barrier for vacancy formation. These structural modifications…

• NN
  National Natural Science Foundation of China

  Award: 52302263