期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 860, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.113930
关键词
Oxygen reduction reaction; Oxygen evolution reaction; Graphene; Heteroatom; MnFe2O4
资金
- National Natural Science Foundation of China [21776147, 61604086]
- Department of Science and Technology of Shandong Province [ZR2018BB066, 2016GGX104010]
- College Students' Innovative and Entrepreneurial Training Programs of Shandong Province [S201910426014, S201913997002]
- Qingdao Municipal Science and Technology Bureau, China [19-6-1-91-nsh]
- Department of Education of Shandong Province [J16LA14]
- Malmstrom Endowment Fund at Hamline University
Heterogeneous nanopartides with synergistic effects between different composites are potential catalysts with bifunctional catalytic activity for oxygen reduction (ORR) and oxygen evolution reaction (OER). Herein, heteroatoms such as N and S are doped into graphene substrates to improve catalytic activity and structural stability of Ag-MnFe2O4 nanoparticles, Interestingly, these particles keep a primarily heterogeneous structure for their assembly on N, S-codoped graphene (NSG), while Ag domains shrink on S-doped graphene (SG) or N-doped graphene (NG). Subsequently, Ag-MnFe2O4 /NSG shows the best bifunctional catalytic activity due to the improved stability of Ag-MnFe2O4 NPs on NSG and enhanced bonding energy between supports and particles. The Koutecky-Levich plots confirm a major four-electron reaction pathway for the ORRs on Ag-MnFe2O4/NSG. Meanwhile, Ag-MnFe2O4/NSG exhibits higher stability and better methanol tolerance than commercial Pt/C. Therefore, Ag-MnFe2O4/NSG with bi functional catalytic activity for ORR and OER is a promising non-Pt catalyst candidate. (C) 2020 Elsevier B.V. All rights reserved.
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