An Efficient High‐Entropy Perovskite‐Type Air Electrode for Reversible Oxygen Reduction and Water Splitting in Protonic Ceramic Cells

Abstract Reversible protonic ceramic electrochemical cells (R‐PCECs) are emerging as ideal devices for highly efficient energy conversion (generating electricity) and storage (producing H 2 ) at intermediate temperatures (400–700 °C). However, their commercialization is largely hindered by the development of highly efficient air electrodes for oxygen reduction and water‐splitting reactions. Here, the findings in the design of a highly active and durable air electrode are reported: high‐entropy Pr 0.2 Ba 0.2 Sr 0.2 La 0.2 Ca 0.2 CoO 3− δ (HE‐PBSLCC), which exhibits impressive activity and stability for oxygen reduction and water‐splitting reactions, as confirmed by electrochemical characterizations and…

• NN
  National Natural Science Foundation of China

  Awards: 22179039, 22005105
• NS
  Natural Science Foundation of Guangdong Province

  Award: 2021A1515010395