Ultrathin iron-cobalt oxide nanosheets with abundant oxygen vacancies for the oxygen evolution reaction

Zhuang, Linzhou, Ge, Lei, Yang, Yisu, Li, Mengran, Jia, Yi, Yao, Xiangdong and Zhu, Zhonghua (2017) Ultrathin iron-cobalt oxide nanosheets with abundant oxygen vacancies for the oxygen evolution reaction. Advanced Materials, 29 17: . doi:10.1002/adma.201606793


Author Zhuang, Linzhou
Ge, Lei
Yang, Yisu
Li, Mengran
Jia, Yi
Yao, Xiangdong
Zhu, Zhonghua
Title Ultrathin iron-cobalt oxide nanosheets with abundant oxygen vacancies for the oxygen evolution reaction
Journal name Advanced Materials   Check publisher's open access policy
ISSN 1521-4095
0935-9648
Publication date 2017-02-27
Sub-type Article (original research)
DOI 10.1002/adma.201606793
Open Access Status Not yet assessed
Volume 29
Issue 17
Total pages 7
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Collection year 2018
Language eng
Formatted abstract
Electrochemical water splitting is a promising method for storing light/electrical energy in the form of H2 fuel; however, it is limited by the sluggish anodic oxygen evolution reaction (OER). To improve the accessibility of H2 production, it is necessary to develop an efficient OER catalyst with large surface area, abundant active sites, and good stability, through a low-cost fabrication route. Herein, a facile solution reduction method using NaBH4 as a reductant is developed to prepare iron-cobalt oxide nanosheets (FexCoy-ONSs) with a large specific surface area (up to 261.1 m2 g-1), ultrathin thickness (1.2 nm), and, importantly, abundant oxygen vacancies. The mass activity of Fe1Co1-ONS measured at an overpotential of 350 mV reaches up to 54.9 A g-1, while its Tafel slope is 36.8 mV dec-1; both of which are superior to those of commercial RuO2, crystalline Fe1Co1-ONP, and most reported OER catalysts. The excellent OER catalytic activity of Fe1Co1-ONS can be attributed to its specific structure, e.g., ultrathin nanosheets that could facilitate mass diffusion/transport of OH- ions and provide more active sites for OER catalysis, and oxygen vacancies that could improve electronic conductivity and facilitate adsorption of H2O onto nearby Co3+ sites.
Keyword Oxygen evolution reaction
Oxygen vacancies
Sodium borohydride
Ultrathin nanosheets
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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