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Highly Active Oxygen Evolution on Carbon Fiber Paper Coated with Atomic-Layer-Deposited Cobalt Oxide
journal contribution
posted on 2019-02-25, 00:00 authored by Hyung Jong Choi, Gwon Deok Han, Kiho Bae, Joon Hyung ShimIn
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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cobaltuniformthicknessoxide coating deceleratescarbon fiber paperActive Oxygen Evolutionoptimized ALD-coated carbon fiber paperatomic-layer-deposited CoO xelectrochemical water splittingALD-CoO x filmCoO xsurfaceCoO x layersAtomic-Layer-Deposited Cobalt OxideCarbon Fiber Paper Coatedoxygen evolution performanceoxygen evolution
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