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Zheng L, Ye W, Zhao Y, Lv Z, Shi X, Wu Q, Fang X, Zheng H. Defect-Induced Atomic Arrangement in CoFe Bimetallic Heterostructures with Boosted Oxygen Evolution Activity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2205092. [PMID: 36534831 DOI: 10.1002/smll.202205092] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 12/01/2022] [Indexed: 06/17/2023]
Abstract
Three CoFe-bimetallic oxides with different compositions (termed as CoFeOx -A/N/H) are prepared by thermally treating metal-organic-framework (MOF) precursors under different atmospheres (air, N2, and NaBH4 /N2 ), respectively. With the aid of vast oxygen vacancies (Ov ), cobalt at tetrahedral sites (Co2+ (Th)) in spinel Co3 O4 is diffused into interstitial octahedral sites (Oh) to form rocksalt CoO and ternary oxide CoFe2 O4 has been induced to give the unique defective CoO/CoFe2 O4 heterostructure. The resultant CoFeOx -H exhibits superb electrocatalytic activity toward water oxidation: overpotential at 10 mA cm-2 is 192 mV, which is 122 mV smaller than that of CoFeOx -A. The smaller Tafel slope (42.53 mV dec-1 ) and higher turnover frequency (785.5 h-1 ) suggest fast reaction kinetics. X-ray absorption spectroscopy, ex situ characterizations, and theoretical calculations reveal that defect engineering effectively tunes the electronic configuration to a more active state, resulting in the greatly decreased binding energy of oxo intermediates, and consequently much lower catalytic overpotential. Moreover, the construction of hetero-interface in CoFeOx -H can provide rich active sites and promote efficient electron transfer. This work may shed light on a comprehensive understanding of the modulation of electron configuration of bimetallic oxides and inspire the smart design of high-performance electrocatalysts.
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Affiliation(s)
- Lingxia Zheng
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
- Petroleum and Chemical Industry Key Laboratory of Organic Electrochemical Synthesis, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
| | - Weiqing Ye
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
| | - Yijian Zhao
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
| | - Zhuoqing Lv
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
| | - Xiaowei Shi
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
- Petroleum and Chemical Industry Key Laboratory of Organic Electrochemical Synthesis, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
| | - Qi Wu
- School of Science and Institute of Oxygen Supply and Everest Research Institute, Tibet University, Lhasa, 850000, P. R. China
| | - Xiaosheng Fang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Materials Science, Fudan University, Shanghai, 200433, P. R. China
| | - Huajun Zheng
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
- Petroleum and Chemical Industry Key Laboratory of Organic Electrochemical Synthesis, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
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Huang W, Wang K, Cao Q, Zhao Y, Sun X, Ding R, Liu E, Gao P, Li G. Hierarchical NiCo pearl strings as efficient electrocatalysts for urea electrooxidation. NEW J CHEM 2021. [DOI: 10.1039/d0nj06045c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A NiCo alloy with a hierarchical pearl string architecture demonstrates excellent catalytic performance towards the alkaline urea oxidation reaction.
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Affiliation(s)
- Wen Huang
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- College of Chemistry
- Xiangtan University
- Hunan 411105
- P. R. China
| | - Kaili Wang
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- College of Chemistry
- Xiangtan University
- Hunan 411105
- P. R. China
| | - Qiuhan Cao
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- College of Chemistry
- Xiangtan University
- Hunan 411105
- P. R. China
| | - Yongjie Zhao
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- College of Chemistry
- Xiangtan University
- Hunan 411105
- P. R. China
| | - Xiujuan Sun
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- College of Chemistry
- Xiangtan University
- Hunan 411105
- P. R. China
| | - Rui Ding
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- College of Chemistry
- Xiangtan University
- Hunan 411105
- P. R. China
| | - Enhui Liu
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- College of Chemistry
- Xiangtan University
- Hunan 411105
- P. R. China
| | - Ping Gao
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
- College of Chemistry
- Xiangtan University
- Hunan 411105
- P. R. China
| | - Gaijuan Li
- Jilin Academy of Fishery Sciences
- Changchun
- China
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