Oxygen-deficient triple perovskites as highly active and durable bifunctional electrocatalysts for oxygen electrode reactions.

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Science advances, ISSN: 2375-2548, Vol: 4, Issue: 6, Page: eaap9360

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Kim, Nam-In; Sa, Young Jin; Yoo, Tae Sup; Choi, Sung Ryul; Afzal, Rana Arslan; Choi, Taekjib; Seo, Young-Soo; Lee, Kug-Seung; Hwang, Jun Yeon; Choi, Woo Seok; Joo, Sang Hoon; Park, Jun-Young Show More Hide
American Association for the Advancement of Science (AAAS); AMER ASSOC ADVANCEMENT SCIENCE
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Highly active and durable bifunctional oxygen electrocatalysts have been of pivotal importance for renewable energy conversion and storage devices, such as unitized regenerative fuel cells and metal-air batteries. Perovskite-based oxygen electrocatalysts have emerged as promising nonprecious metal bifunctional electrocatalysts, yet their catalytic activity and stability still remain to be improved. We report a high-performance oxygen electrocatalyst based on a triple perovskite, NdBaCoFeMnO (NBCFM), which shows superior activity and durability for oxygen electrode reactions to single and double perovskites. When hybridized with nitrogen-doped reduced graphene oxide (N-rGO), the resulting NBCFM/N-rGO catalyst shows further boosted bifunctional oxygen electrode activity (0.698 V), which surpasses that of Pt/C (0.801 V) and Ir/C (0.769 V) catalysts and which, among the perovskite-based electrocatalysts, is the best activity reported to date. The superior catalytic performances of NBCFM could be correlated to its oxygen defect-rich structure, lower charge transfer resistance, and smaller hybridization strength between O 2p and Co 3d orbitals.