Enhanced Activity and Stability of TiO2‑Coated Cobalt/Carbon Catalysts for Electrochemical Water Oxidation

TiO2-coated Co/C catalysts prepared by atomic layer deposition (ALD) were used to study the effect of TiO2 overcoating on a Co/C catalyst for electrochemical water oxidation. The Co/C catalyst with a thin-layer overcoating of TiO2 (ALD­(TiO2)-Co/C) demonstrated 2.5 times higher turnover frequency (T...

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Bibliographic Details
Published in:ACS catalysis 2015-06, Vol.5 (6), p.3463-3469
Main Authors: Kim, Hyung Ju, Jackson, David H. K, Lee, Jechan, Guan, Yingxin, Kuech, Thomas F, Huber, George W
Format: Article
Language:English
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Summary:TiO2-coated Co/C catalysts prepared by atomic layer deposition (ALD) were used to study the effect of TiO2 overcoating on a Co/C catalyst for electrochemical water oxidation. The Co/C catalyst with a thin-layer overcoating of TiO2 (ALD­(TiO2)-Co/C) demonstrated 2.5 times higher turnover frequency (TOF) than the Co/C catalyst for the reaction. The TOF of the ALD­(TiO2)-Co/C catalyst increased when the ALD­(TiO2) coating cycle number was increased from 5 to 60. In addition, the stability of the 60 cycle ALD­(TiO2)-Co/C catalyst was enhanced compared to the Co/C catalyst. This work shows how the ALD synthesis technique can be used to improve the catalytic activity and stability of nonprecious-metal-based catalysts like Co/C for electrochemical water oxidation.
ISSN:2155-5435
2155-5435
DOI:10.1021/acscatal.5b00173