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

Research output: Contribution to journalArticle

14 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 languageEnglish
Pages (from-to)2573-2576
Number of pages4
JournalACS Catalysis
Volume5
Issue number4
DOIs
Publication statusPublished - 2015 Apr 3

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Cobalt
Acidity
Oxides
Catalysis
Oxygen
Zeolites
Atoms
Oxidation
Water
Nanoparticles
Catalysts
Experiments

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

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

In: ACS Catalysis, Vol. 5, No. 4, 03.04.2015, p. 2573-2576.

Research output: Contribution to journalArticle

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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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