RT Journal Article
SR Electronic
T1 Oxygen-deficient triple perovskites as highly active and durable bifunctional electrocatalysts for oxygen electrode reactions
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaap9360
DO 10.1126/sciadv.aap9360
VO 4
IS 6
A1 Kim, Nam-In
A1 Sa, Young Jin
A1 Yoo, Tae Sup
A1 Choi, Sung Ryul
A1 Afzal, Rana Arslan
A1 Choi, Taekjib
A1 Seo, Young-Soo
A1 Lee, Kug-Seung
A1 Hwang, Jun Yeon
A1 Choi, Woo Seok
A1 Joo, Sang Hoon
A1 Park, Jun-Young
YR 2018
UL http://advances.sciencemag.org/content/4/6/eaap9360.abstract
AB 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−δ (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.