Reversible protonic ceramic electrochemical cells (R-PCECs) are seen as a promising technology for bidirectional electric energy generation or storage, offering efficient conversion of electrical and chemical energy. A recent study led by Professor Shaorong Wang from China University of Mining and Technology focused on enhancing the activity and stability of the BFCZY oxygen electrode in R-PCECs through heterointerface engineering. The team addressed the challenges of catalytic performance, steam tolerance, and element segregation by introducing BCO-BFCZY heterointerfaces using a straightforward solution infiltration technique. The resulting BCO-BFCZY oxygen electrode displayed improved activity and durability for oxygen reduction/evolution reactions, ultimately enhancing the performance and longevity of R-PCECs. Density functional theory (DFT) research further confirmed the enhanced kinetics and durability of the modified electrode. The study not only revealed the degradation mechanism of the BFCZY oxygen electrode under various conditions but also proposed effective strategies to mitigate degradation and improve overall performance. The work, published in the Journal of Advanced Ceramics, contributes to the stability research of oxygen electrodes, providing a significant step towards enhancing the efficiency and durability of R-PCECs. Funded by the National Key Research and Development Program of China, this research is pivotal in advancing the field of solid oxide cells, with a focus on improving the electrochemical performance and longevity of oxygen electrodes.