Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• ACS applied materials & interfaces, 2019-03, Vol.11 (11), p.10608-10615

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.