Highly Active Oxygen Evolution on Carbon Fiber Paper Coated with Atomic-Layer-Deposited Cobalt Oxide
- Authors
- Choi, Hyung Jong; Han, Gwon Deok; Bae, Kiho; Shim, Joon Hyung
- Issue Date
- 20-3월-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- atomic layer deposition; thin film catalysts; cobalt oxide; oxygen evolution; surface chemistry
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.11, no.11, pp.10608 - 10615
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 11
- Number
- 11
- Start Page
- 10608
- End Page
- 10615
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/66631
- DOI
- 10.1021/acsami.8b19064
- ISSN
- 1944-8244
- Abstract
- In this work, we evaluated the oxygen evolution performance of cobalt oxide (CoOx)-coated carbon fiber paper in electrochemical water splitting. For a uniform coating of CoOx 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 CoOx (ALD-CoOx) 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 CoOx 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-CoOx film is dependent on two competing effects: the high oxidation state of cobalt ions in thicker CoOx helps the oxygen evolution, whereas the introduction of a thick oxide coating decelerates the rate of charge transfer at the surface.
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