Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 11, Pages 10608-10615Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19064
Keywords
atomic layer deposition; thin film catalysts; cobalt oxide; oxygen evolution; surface chemistry
Funding
- Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2018M3A7B8061661]
- Korea Ministry of Environment (MOE) through the Public Technology Program based on Environmental Policy [E416-00070-0604-0]
- National Research Foundation of Korea [2018M3A7B8061661] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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