Engineering High-Energy Interfacial Structures for High-Performance Oxygen-Involving Electrocatalysis.
Engineering high-energy interfacial structures for high-performance electrocatalysis is achieved by chemical coupling of active CoO nanoclusters and high-index facet Mn3O4nano-octahedrons (hi-Mn3O4). A thorough characterization, including synchrotron-based near edge X-ray absorption fine structure, reveals that strong interactions between both components promote the formation of high-energy interfacial Mn-O-Co species and high oxidation state CoO, from which electrons are drawn by MnIII-O present in hi-Mn3O4. The CoO/hi-Mn3O4demonstrates an excellent catalytic performance over the conventional metal oxide-based electrocatalysts, which is reflected by 1.2 times higher oxygen evolution reaction (OER) activity than that of Ru/C and a comparable oxygen reduction reaction (ORR) activity to that of Pt/C as well as a better stability than that of Ru/C (95 % vs. 81 % retained OER activity) and Pt/C (92 % vs. 78 % retained ORR activity after 10 h running) in alkaline electrolyte.
School of Chemical Engineering, University of Adelaide, Adelaide, SA, 5005, Australia.
Chunxian
C
Guo
School of Chemical Engineering, University of Adelaide, Adelaide, SA, 5005, Australia.
Yao
Y
Zheng
School of Chemical Engineering, University of Adelaide, Adelaide, SA, 5005, Australia.
Jingrun
J
Ran
School of Chemical Engineering, University of Adelaide, Adelaide, SA, 5005, Australia.
Fangxi
F
Xie
Department of Chemistry and Biochemistry, Kent State University, Kent, USA.
Mietek
M
Jaroniec
School of Chemical Engineering, University of Adelaide, Adelaide, SA, 5005, Australia.
Shi-Zhang
0000-0002-4568-8422
SZ
Qiao
electrocatalysts; electrode materials; high-energy interfaces; nanocatalysis; oxygen evolution