Synergistic enhancement of electrochemical performance in reversible solid oxide cells via deficiency‐induced oxygen vacancy and nanoparticle generation

Abstract To enhance the electrochemical performance of the reversible solid oxide cell (RSOC), a facile way through adopting A‐site deficient Pr 0.94 BaCo 1.5 Fe 0.5 O 5+ δ (PBCF94) as an air electrode for RSOC is reported. The designed A‐site Pr‐deficient air electrode is expected to provide abundant oxygen vacancies, macroscopic nanoparticle generation, excellent redox properties and oxygen mobility, which ultimately contribute to the enhanced electrocatalytic activity. The results confirm that the RSOC with an A‐site deficient air electrode exhibits considerable peak power density up to 1.53 W·cm −2 , and the desirable electrolysis current density reaches 2.29 A·cm −2 at 1.5 V and 800 °C. Correspondingly, the RSOC exhibits remarkable long‐term reversible stability of 200 h. Thus, the A‐site deficient Pr 0.94 BaCo 1.5 Fe 0.5 O 5+ δ air electrode could be the potential one for RSOC application.