Enhanced activity and stability of TiO2-coated cobalt/carbon catalysts for electrochemical water oxidation

Hyung Ju Kim; David H.K. Jackson; Jechan Lee; Yingxin Guan; Thomas F. Kuech; George W. Huber

doi:10.1021/acscatal.5b00173

Enhanced activity and stability of TiO₂-coated cobalt/carbon catalysts for electrochemical water oxidation

Hyung Ju Kim, David H.K. Jackson, Jechan Lee, Yingxin Guan, Thomas F. Kuech, George W. Huber

Research output: Contribution to journal › Article › peer-review

47 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	3463-3469
Number of pages	7
Journal	ACS Catalysis
Volume	5
Issue number	6
DOIs	https://doi.org/10.1021/acscatal.5b00173
State	Published - 5 Jun 2015
Externally published	Yes

Keywords

atomic layer deposition
Co catalyst
Co-TiO interface
TiO coating
water oxidation

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10.1021/acscatal.5b00173

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title = "Enhanced activity and stability of TiO2-coated cobalt/carbon catalysts for electrochemical water oxidation",

abstract = "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.",

keywords = "atomic layer deposition, Co catalyst, Co-TiO interface, TiO coating, water oxidation",

author = "Kim, \{Hyung Ju\} and Jackson, \{David H.K.\} and Jechan Lee and Yingxin Guan and Kuech, \{Thomas F.\} and Huber, \{George W.\}",

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

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doi = "10.1021/acscatal.5b00173",

language = "English",

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journal = "ACS Catalysis",

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TY - JOUR

T1 - Enhanced activity and stability of TiO2-coated cobalt/carbon catalysts for electrochemical water oxidation

AU - Kim, Hyung Ju

AU - Jackson, David H.K.

AU - Lee, Jechan

AU - Guan, Yingxin

AU - Kuech, Thomas F.

AU - Huber, George W.

PY - 2015/6/5

Y1 - 2015/6/5

N2 - 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.

AB - 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.

KW - atomic layer deposition

KW - Co catalyst

KW - Co-TiO interface

KW - TiO coating

KW - water oxidation

UR - https://www.scopus.com/pages/publications/84930620530

U2 - 10.1021/acscatal.5b00173

DO - 10.1021/acscatal.5b00173

M3 - Article

AN - SCOPUS:84930620530

SN - 2155-5435

VL - 5

SP - 3463

EP - 3469

JO - ACS Catalysis

JF - ACS Catalysis

IS - 6

ER -

Enhanced activity and stability of TiO₂-coated cobalt/carbon catalysts for electrochemical water oxidation

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Keywords

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