Structural relationship between CoO6 cluster and phosphate species in a cobalt-phosphate water oxidation catalyst investigated by co and p K-edge XAFS

Masaaki Yoshida, Takehiro Mineo, Yosuke Mitsutomi, Futaba Yamamoto, Hirokatsu Kurosu, Satoru Takakusagi, Kiyotaka Asakura, Hiroshi Kondoh

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11 Citations (Scopus)

Abstract

A cobaltphosphate (Co-Pi) oxygen evolution cocatalyst on a SrTiO3 photoelectrode was investigated by Co and P K-edge X-ray absorption fine structure (XAFS) spectroscopy. Formation of an edge-sharing CoO6 octahedral structure nanocluster in the Co-Pi cocatalyst was verified by the Co K-edge XAFS spectra under the photoelectrochemical reaction. The P K-edge XAFS spectrum for the Co-Pi cocatalyst showed a pre-edge peak derived from the hybridization of Co(3d)O( 2p)P( 3p) valence orbitals. Therefore, it was spectroscopically demonstrated that a phosphate species binds to the Co edge of the CoO6 cluster in the Co-Pi cocatalyst. The phosphate species is likely to stabilize the CoO6 cluster for efficient oxygen evolution activity.

Original languageEnglish
Pages (from-to)277-279
Number of pages3
JournalChemistry Letters
Volume45
Issue number3
DOIs
Publication statusPublished - 2016

Keywords

  • Oxygen evolution reaction (OER)
  • Photocatalyst
  • XAFS spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)

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