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

Research output: Contribution to journalArticle

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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

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X ray absorption
Cobalt
X ray absorption fine structure spectroscopy
Phosphates
Oxygen
Oxidation
Catalysts
Water
Nanoclusters
strontium titanium oxide

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Structural relationship between CoO6 cluster and phosphate species in a cobalt-phosphate water oxidation catalyst investigated by co and p K-edge XAFS. / Yoshida, Masaaki; Mineo, Takehiro; Mitsutomi, Yosuke; Yamamoto, Futaba; Kurosu, Hirokatsu; Takakusagi, Satoru; Asakura, Kiyotaka; Kondoh, Hiroshi.

In: Chemistry Letters, Vol. 45, No. 3, 2016, p. 277-279.

Research output: Contribution to journalArticle

Yoshida, Masaaki ; Mineo, Takehiro ; Mitsutomi, Yosuke ; Yamamoto, Futaba ; Kurosu, Hirokatsu ; Takakusagi, Satoru ; Asakura, Kiyotaka ; Kondoh, Hiroshi. / Structural relationship between CoO6 cluster and phosphate species in a cobalt-phosphate water oxidation catalyst investigated by co and p K-edge XAFS. In: Chemistry Letters. 2016 ; Vol. 45, No. 3. pp. 277-279.
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AU - Yamamoto, Futaba

AU - Kurosu, Hirokatsu

AU - Takakusagi, Satoru

AU - Asakura, Kiyotaka

AU - Kondoh, Hiroshi

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AB - 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.

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