Enhancing Electrocatalytic Activity of Perovskite Oxides by Tuning Cation Deficiency for Oxygen Reduction and Evolution Reactions

Development of cost-effective and efficient electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of prime importance to emerging renewable energy technologies. Here, we report a simple and effective strategy for enhancing ORR and OER electrocatalytic activity in alkaline solution by introducing A-site cation deficiency in LaFeO3 perovskite; the enhancement effect is more pronounced for the OER than the ORR. Among the A-site cation deficient perovskites studied, La0.95FeO3-δ (L0.95F) demonstrates the highest ORR and OER activity and, hence, the best bifunctionality. The dramatic enhancement is attributed to the creation of surface oxygen vacancies and a small amount of…

• NN
  National Natural Science Foundation of China

  Award: 21576135
• GO
  Government of Jiangsu Province

  Award: BK20150945
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK2011030
• PA
  Priority Academic Program Development of Jiangsu Higher Education Institutions
• AR
  Advanced Research Projects Agency - Energy

  Award: DE-AR0000502