Kim, Nam-In Sa, Young Jin Yoo, Tae Sup Choi, Sung Ryul Afzal, Rana ArsIan Choi, Taekjib Seo, Young-Soo Lee, Kug-Seung Hwang, Jun Yeon Choi, Woo Seok Joo, Sang Hoon Park, Jun-Young 2024-01-19T22:33:12Z 2024-01-19T22:33:12Z 2021-09-03 2018-06 2375-2548 https://pubs.kist.re.kr/handle/201004/121308 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, Nd1.5Ba1.5CoFeMnO9-delta (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. English AMER ASSOC ADVANCEMENT SCIENCE METAL-AIR BATTERIES EVOLUTION REACTION ENHANCED ACTIVITY OXIDE CATALYSTS ALKALINE MEDIA FUEL-CELLS REDUCTION GRAPHENE TEMPERATURE HYBRID Oxygen-deficient triple perovskites as highly active and durable bifunctional electrocatalysts for oxygen electrode reactions Article 10.1126/sciadv.aap9360 1 SCIENCE ADVANCES, v.4, no.6 SCIENCE ADVANCES 4 6 scie scopus 000443175500015 2-s2.0-85049153451 Multidisciplinary Sciences Science & Technology - Other Topics Article METAL-AIR BATTERIES EVOLUTION REACTION ENHANCED ACTIVITY OXIDE CATALYSTS ALKALINE MEDIA FUEL-CELLS REDUCTION GRAPHENE TEMPERATURE HYBRID triple perovskites atom catalyst energy storage fuel cell OER