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

doi:10.1246/cl.151073

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

A cobaltphosphate (Co-P_i) 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-P_i cocatalyst was verified by the Co K-edge XAFS spectra under the photoelectrochemical reaction. The P K-edge XAFS spectrum for the Co-P_i 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-P_i cocatalyst. The phosphate species is likely to stabilize the CoO₆ cluster for efficient oxygen evolution activity.

Original language	English
Pages (from-to)	277-279
Number of pages	3
Journal	Chemistry Letters
Volume	45
Issue number	3
DOIs	https://doi.org/10.1246/cl.151073
Publication status	Published - 2016

Keywords

Oxygen evolution reaction (OER)
Photocatalyst
XAFS spectroscopy

ASJC Scopus subject areas

Chemistry(all)

Access to Document

10.1246/cl.151073

Cite this

@article{3000ed9d68c049b385cc37231f8c893e,

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

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.",

keywords = "Oxygen evolution reaction (OER), Photocatalyst, XAFS spectroscopy",

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

note = "Publisher Copyright: {\textcopyright} 2016 The Chemical Society of Japan.",

year = "2016",

doi = "10.1246/cl.151073",

language = "English",

volume = "45",

pages = "277--279",

journal = "Chemistry Letters",

issn = "0366-7022",

publisher = "Chemical Society of Japan",

number = "3",

}

TY - JOUR

T1 - Structural relationship between CoO6 cluster and phosphate species in a cobalt-phosphate water oxidation catalyst investigated by co and p K-edge XAFS

AU - Yoshida, Masaaki

AU - Mineo, Takehiro

AU - Mitsutomi, Yosuke

AU - Yamamoto, Futaba

AU - Kurosu, Hirokatsu

AU - Takakusagi, Satoru

AU - Asakura, Kiyotaka

AU - Kondoh, Hiroshi

PY - 2016

Y1 - 2016

N2 - 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.

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.

KW - Oxygen evolution reaction (OER)

KW - Photocatalyst

KW - XAFS spectroscopy

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U2 - 10.1246/cl.151073

DO - 10.1246/cl.151073

M3 - Article

AN - SCOPUS:84964194275

SN - 0366-7022

VL - 45

SP - 277

EP - 279

JO - Chemistry Letters

JF - Chemistry Letters

IS - 3

ER -