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

23 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

ASJC Scopus subject areas

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

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