Water Oxidation by Cobalt Centers on Various Oxide Surfaces: The Effects of Oxide Surface Acidity and Oxygen Atom Affinity on Catalysis

Hyun S. Ahn; Junko Yano; T. Don Tilley

doi:10.1021/cs502120f

Water Oxidation by Cobalt Centers on Various Oxide Surfaces: The Effects of Oxide Surface Acidity and Oxygen Atom Affinity on Catalysis

Hyun S. Ahn, Junko Yano, T. Don Tilley

Department of Chemistry

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

20 Citations (Scopus)

Abstract

Single-atom cobalt centers on various oxide surfaces (TiO₂, MgO, SBA-15, AlPO, and Y-Zeolite) were prepared and evaluated as water oxidation catalysts by photochemical water oxidation experiments. Superior catalytic rates were observed for cobalt sites on basic supporting oxides (TiO₂ and MgO) relative to those on acidic oxides (Y-Zeolite, AlPO, and SiO₂). Per-atom turnover frequencies of ca. 0.04 s^-1 were achieved, giving initial rates 100 times greater than that of a surface atom of a Co₃O₄ nanoparticle. Contrary to expectations based on theoretical work, no apparent correlation was observed between the catalytic rates and the oxygen atom affinities of the supporting oxides. (Graph Presented).

Original language	English
Pages (from-to)	2573-2576
Number of pages	4
Journal	ACS Catalysis
Volume	5
Issue number	4
DOIs	https://doi.org/10.1021/cs502120f
Publication status	Published - 2015 Apr 3

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Publisher Copyright:
© 2015 American Chemical Society.

All Science Journal Classification (ASJC) codes

Catalysis
Chemistry(all)

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10.1021/cs502120f

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abstract = "Single-atom cobalt centers on various oxide surfaces (TiO2, MgO, SBA-15, AlPO, and Y-Zeolite) were prepared and evaluated as water oxidation catalysts by photochemical water oxidation experiments. Superior catalytic rates were observed for cobalt sites on basic supporting oxides (TiO2 and MgO) relative to those on acidic oxides (Y-Zeolite, AlPO, and SiO2). Per-atom turnover frequencies of ca. 0.04 s-1 were achieved, giving initial rates 100 times greater than that of a surface atom of a Co3O4 nanoparticle. Contrary to expectations based on theoretical work, no apparent correlation was observed between the catalytic rates and the oxygen atom affinities of the supporting oxides. (Graph Presented).",

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AU - Ahn, Hyun S.

AU - Yano, Junko

AU - Tilley, T. Don

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N2 - Single-atom cobalt centers on various oxide surfaces (TiO2, MgO, SBA-15, AlPO, and Y-Zeolite) were prepared and evaluated as water oxidation catalysts by photochemical water oxidation experiments. Superior catalytic rates were observed for cobalt sites on basic supporting oxides (TiO2 and MgO) relative to those on acidic oxides (Y-Zeolite, AlPO, and SiO2). Per-atom turnover frequencies of ca. 0.04 s-1 were achieved, giving initial rates 100 times greater than that of a surface atom of a Co3O4 nanoparticle. Contrary to expectations based on theoretical work, no apparent correlation was observed between the catalytic rates and the oxygen atom affinities of the supporting oxides. (Graph Presented).

AB - Single-atom cobalt centers on various oxide surfaces (TiO2, MgO, SBA-15, AlPO, and Y-Zeolite) were prepared and evaluated as water oxidation catalysts by photochemical water oxidation experiments. Superior catalytic rates were observed for cobalt sites on basic supporting oxides (TiO2 and MgO) relative to those on acidic oxides (Y-Zeolite, AlPO, and SiO2). Per-atom turnover frequencies of ca. 0.04 s-1 were achieved, giving initial rates 100 times greater than that of a surface atom of a Co3O4 nanoparticle. Contrary to expectations based on theoretical work, no apparent correlation was observed between the catalytic rates and the oxygen atom affinities of the supporting oxides. (Graph Presented).

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Water Oxidation by Cobalt Centers on Various Oxide Surfaces: The Effects of Oxide Surface Acidity and Oxygen Atom Affinity on Catalysis

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