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Nano Research

, Volume 11, Issue 6, pp 3509–3518 | Cite as

Tuning oxygen vacancies in two-dimensional iron-cobalt oxide nanosheets through hydrogenation for enhanced oxygen evolution activity

  • Linzhou Zhuang
  • Yi Jia
  • Tianwei He
  • Aijun Du
  • Xuecheng Yan
  • Lei Ge
  • Zhonghua Zhu
  • Xiangdong Yao
Research Article

Abstract

The oxygen evolution reaction (OER) represents the rate-determining step of electrocatalytic water splitting into hydrogen and oxygen. Creating oxygen vacancies and adjusting their density has proven to be an effective strategy to design high-performance OER catalysts. Herein, a hydrogenation method is applied to treat a two-dimensional (2D) iron-cobalt oxide (Fe1Co1Ox-origin), with the purpose of tuning its oxygen vacancy density. Notably, compared with Fe1Co1Ox-origin, the iron-cobalt oxide hydrogenated at 200 °C and 2.0 MPa optimized conditions exhibits a markedly improved OER activity in 1.0 M KOH (with an overpotential η of 225 mV at a current density of 10 mA·cm–2) and a rapid reaction kinetics (with a Tafel slope of 36.0 mV·dec–1). Moreover, the OER mass activity of the hydrogenated oxide is 1.9 times that of Fe1Co1Ox-origin at an overpotential of 350 mV. The experimental results, combined with density functional theory (DFT) calculations, reveal that the optimal control of oxygen vacancies in 2D Fe1Co1Ox via hydrogenation can improve the electronic conductivity and promote OH adsorption onto nearby low-coordinated Co3+ sites, resulting in a significantly enhanced OER activity.

Keywords

hydrogenation tuning oxygen vacancy oxygen evolution reaction 

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Notes

Acknowledgements

The financial support from ARC is highly appreciated, through ARC Discovery Project (No. DP170103317), ARC Future Fellowship (No. FT120100720) and ARC Discovery Early Career Researcher Award (No. ARC DE180101030). L. Z. Z. acknowledges the support from International Postgraduate Research Scholarship (IPRS) and UQ Centennial Scholarship (UQCent). The authors acknowledge the scientific and technical assistance of the Australian Microscopy and Microanalysis Research Facility at the UQ Centre.

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Tuning oxygen vacancies in two-dimensional iron-cobalt oxide nanosheets through hydrogenation for enhanced oxygen evolution activity

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Linzhou Zhuang
    • 1
  • Yi Jia
    • 2
  • Tianwei He
    • 3
  • Aijun Du
    • 3
  • Xuecheng Yan
    • 2
  • Lei Ge
    • 1
  • Zhonghua Zhu
    • 1
  • Xiangdong Yao
    • 2
  1. 1.School of Chemical EngineeringThe University of QueenslandBrisbaneAustralia
  2. 2.School of Environment and Science and Queensland Micro- and Nanotechnology CentreGriffith University, Nathan CampusBrisbaneAustralia
  3. 3.School of Chemistry, Physics, and Mechanical EngineeringQueensland University of Technology, Gardens Point CampusBrisbaneAustralia

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