Highly Active Oxygen Evolution on Carbon Fiber Paper Coated with Atomic-Layer-Deposited Cobalt Oxide

Hyung Jong Choi, Gwon Deok Han, Kiho Bae, Joon Hyung Shim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this work, we evaluated the oxygen evolution performance of cobalt oxide (CoO x )-coated carbon fiber paper in electrochemical water splitting. For a uniform coating of CoO x layers along the carbon fiber paper, the atomic layer deposition (ALD) technique was applied. We achieved a uniform and conformal coating of atomic-layer-deposited CoO x (ALD-CoO x ) on the carbon fiber paper. The overpotential for oxygen evolution measured for the optimized ALD-coated carbon fiber paper was as low as 343 mV at 10 mA cm -2 , which is competitive with the activity of state-of-the-art CoO x prepared on electrodes with large surface areas. Oxygen evolution is not enhanced after a critical thickness, about 28 nm in our study, is reached. The optimal thickness of the ALD-CoO x film is dependent on two competing effects: the high oxidation state of cobalt ions in thicker CoO x helps the oxygen evolution, whereas the introduction of a thick oxide coating decelerates the rate of charge transfer at the surface.

Original languageEnglish
Pages (from-to)10608-10615
Number of pages8
JournalACS Applied Materials and Interfaces
Volume11
Issue number11
DOIs
Publication statusPublished - 2019 Mar 20

Keywords

  • atomic layer deposition
  • cobalt oxide
  • oxygen evolution
  • surface chemistry
  • thin film catalysts

ASJC Scopus subject areas

  • Materials Science(all)

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