10.1021/acsami.8b19064.s001
Hyung Jong Choi
Hyung Jong
Choi
Gwon Deok Han
Gwon Deok
Han
Kiho Bae
Kiho
Bae
Joon Hyung Shim
Joon Hyung
Shim
Highly
Active Oxygen Evolution on Carbon Fiber Paper Coated with Atomic-Layer-Deposited
Cobalt Oxide
American Chemical Society
2019
cobalt
uniform
thickness
oxide coating decelerates
carbon fiber paper
Active Oxygen Evolution
optimized ALD-coated carbon fiber paper
atomic-layer-deposited CoO x
electrochemical water splitting
ALD-CoO x film
CoO x
surface
CoO x layers
Atomic-Layer-Deposited Cobalt Oxide
Carbon Fiber Paper Coated
oxygen evolution performance
oxygen evolution
2019-02-25 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Highly_Active_Oxygen_Evolution_on_Carbon_Fiber_Paper_Coated_with_Atomic-Layer-Deposited_Cobalt_Oxide/7811531
In
this work, we evaluated the oxygen evolution performance of cobalt
oxide (CoO<sub><i>x</i></sub>)-coated carbon fiber paper
in electrochemical water splitting. For a uniform coating of CoO<sub><i>x</i></sub> 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<sub><i>x</i></sub> (ALD-CoO<sub><i>x</i></sub>) 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<sup>–2</sup>, which is competitive with the activity
of state-of-the-art CoO<sub><i>x</i></sub> 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<sub><i>x</i></sub> film is dependent
on two competing effects: the high oxidation state of cobalt ions
in thicker CoO<sub><i>x</i></sub> helps the oxygen evolution,
whereas the introduction of a thick oxide coating decelerates the
rate of charge transfer at the surface.