Low-overpotential overall water splitting by a cooperative interface of cobalt-iron hydroxide and iron oxyhydroxide

Pravin Babar, Komal Patil, Javeed Mahmood, Seok jin Kim, Jin Hyeok Kim*, Cafer T. Yavuz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Interface engineering is a powerful strategy for modulating electronic structure and enhancing intrinsic activity of electrocatalysts for water splitting. Here, we grow two-dimensional cobalt-iron hydroxide (CoFe-OH) nanosheets on nickel foam substrates and deposit FeOOH nanoparticles in a rapid and scalable wet chemical approach. The CoFe-OH@FeOOH nanocomposite features abundant active sites and high surface area, allowing fast kinetics for electrochemical water splitting. The electrode has a low overpotential value of 200 mV at 50 mA cm−2 for oxygen evolution. When used as both anode and cathode for overall water splitting, CoFe-OH@FeOOH provides a low cell voltage of 1.56 V to deliver 10 mA cm−2 current density. The synergistic activity is presumed to be from the seamless interface of CoFe-OH and FeOOH, improving conductivity and mass transfer. We envision that this simple approach may offer a new direction for designing efficient electrodes for energy conversion applications.

Original languageEnglish (US)
Article number100762
JournalCell Reports Physical Science
Volume3
Issue number2
DOIs
StatePublished - Feb 16 2022

Bibliographical note

Funding Information:
This research was supported by the King Abdullah University of Science and Technology , Kingdom of Saudi Arabia, and by a Human Resources Development Program ( 20194030202470 ) of the Korea Institute of Energy Technology, Evaluation, and Planning (KETEP) grant funded by the Korean Government Ministry of Trade , Industry, and Energy, Republic of Korea.

Funding Information:
This research was supported by the King Abdullah University of Science and Technology, Kingdom of Saudi Arabia, and by a Human Resources Development Program (20194030202470) of the Korea Institute of Energy Technology, Evaluation, and Planning (KETEP) grant funded by the Korean Government Ministry of Trade, Industry, and Energy, Republic of Korea. P.B. J.H.K. and C.T.Y. conceived and designed the idea. P.B. carried out the experiments and wrote the manuscript. K.P. provided assistance with the XRD and XPS characterizations. S.K. and J.M. participated in data analyses and discussions. All authors reviewed and contributed to this paper. C.T.Y. is an advisory board member at Cell Reports Physical Science. The authors declare no other competing interests.

Publisher Copyright:
© 2022 The Authors

Keywords

  • electrocatalysis
  • HER
  • interface engineering
  • OER
  • renewable energy
  • sustainable hydrogen generation

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • General Engineering
  • General Energy
  • General Physics and Astronomy

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