Domain structure for an amorphous iridium-oxide water-oxidation catalyst characterized by X-ray pair distribution function analysis

Jier Huang, James D. Blakemore, Diego Fazi, Oleksandr Kokhan, Nathan D. Schley, Robert H. Crabtree, Gary W Brudvig, David M. Tiede

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The domain structure of an amorphous, "blue layer" iridium-oxide water-oxidation catalyst film (BL) electrodeposited from the soluble precursor complex, [Cp*Ir(H2O)3]SO4, was characterized by X-ray pair distribution function (PDF) analysis. The results show that the experimental PDF can be fit remarkably well using a single Ir 5O22 cluster extracted from the rutile lattice. The model includes distortions that indicate the presence of Ir(μ-O)3Ir or distorted Ir(μ-O)2Ir substructures, and hence deviations from a rutile structure. The five Ir atom cluster is suggested to represent the population-averaged distribution of metal-oxo clusters in the film. BL is found to be distinguished from other amorphous film water-oxidation catalysts because of the remarkably small domain size and homogeneity. As such, the blue layer catalyst provides a model for investigating ligand-determined metal-oxide cluster assembly and catalyst mechanism. This journal is

Original languageEnglish
Pages (from-to)1814-1819
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number5
DOIs
Publication statusPublished - Feb 7 2014

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iridium
Distribution functions
distribution functions
catalysts
X rays
Oxidation
oxidation
Catalysts
oxides
Water
rutile
water
x rays
Metals
Population distribution
Amorphous films
metal clusters
substructures
Oxides
homogeneity

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Domain structure for an amorphous iridium-oxide water-oxidation catalyst characterized by X-ray pair distribution function analysis. / Huang, Jier; Blakemore, James D.; Fazi, Diego; Kokhan, Oleksandr; Schley, Nathan D.; Crabtree, Robert H.; Brudvig, Gary W; Tiede, David M.

In: Physical Chemistry Chemical Physics, Vol. 16, No. 5, 07.02.2014, p. 1814-1819.

Research output: Contribution to journalArticle

Huang, Jier ; Blakemore, James D. ; Fazi, Diego ; Kokhan, Oleksandr ; Schley, Nathan D. ; Crabtree, Robert H. ; Brudvig, Gary W ; Tiede, David M. / Domain structure for an amorphous iridium-oxide water-oxidation catalyst characterized by X-ray pair distribution function analysis. In: Physical Chemistry Chemical Physics. 2014 ; Vol. 16, No. 5. pp. 1814-1819.
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AU - Brudvig, Gary W

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