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

Zhuang, Linzhou and Ge, Lei and Yang, Yisu and Li, Mengran and Jia, Yi and Yao, Xiangdong and Zhu, Zhonghua (2017) Ultrathin iron-cobalt oxides nanosheets with abundant oxygen vacancies for oxygen evolution reaction. Advanced Materials, 29 (17). p. 1606793. ISSN 0935-9648

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.


Statistics for USQ ePrint 30966
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 19 Oct 2017 00:39
Last Modified: 17 Apr 2018 23:12
Uncontrolled Keywords: oxygen evolution reaction;oxygen vacancies;sodium borohydride; ultrathin nanosheets
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Funding Details:
Identification Number or DOI: 10.1002/adma.201606793
URI: http://eprints.usq.edu.au/id/eprint/30966

Actions (login required)

View Item Archive Repository Staff Only