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

Title
Oxygen-deficient triple perovskites as highly active and durable bifunctional electrocatalysts for oxygen electrode reactions
Authors
황준연김남인사영진유태섭최성열Rana Arslan Afzal최택집서영수이국승최우석주상훈박준영
Keywords
triple perovskites; atom catalyst; energy storage; fuel cell; OER
Issue Date
2018-06
Publisher
Science Advances
Citation
VOL 4, NO 6-9360-10
Abstract
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 nonpreciousmetal 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− d (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.
URI
http://pubs.kist.re.kr/handle/201004/67820
ISSN
2375-2548
Appears in Collections:
KIST Publication > Article
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