Photoexcited hole transfer to a MnOx cocatalyst on a SrTiO3 photoelectrode during oxygen evolution studied by in situ X-ray absorption spectroscopy

Masaaki Yoshida; Takumi Yomogida; Takehiro Mineo; Kiyofumi Nitta; Kazuo Kato; Takuya Masuda; Hiroaki Nitani; Hitoshi Abe; Satoru Takakusagi; Tomoya Uruga; Kiyotaka Asakura; Kohei Uosaki; Hiroshi Kondoh

doi:10.1021/jp507657p

Photoexcited hole transfer to a MnO_x cocatalyst on a SrTiO₃ photoelectrode during oxygen evolution studied by in situ X-ray absorption spectroscopy

Masaaki Yoshida, Takumi Yomogida, Takehiro Mineo, Kiyofumi Nitta, Kazuo Kato, Takuya Masuda, Hiroaki Nitani, Hitoshi Abe, Satoru Takakusagi, Tomoya Uruga, Kiyotaka Asakura, Kohei Uosaki, Hiroshi Kondoh

Department of Chemistry

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

36 Citations (Scopus)

Abstract

Photoexcited hole transfer to MnO_x cocatalysts on SrTiO₃ photoelectrodes was examined under controlled potential conditions during UV irradiation using in situ Mn K-edge X-ray absorption fine structure (XAFS) spectroscopy. The absorption edges of spectra were found to shift to higher energies during irradiation, indicating that MnO_x cocatalysts were oxidized by the migration of photoexcited holes accompanied by a positive potential shift of the MnO_x cocatalysts. This oxidation process was promoted by the application of a positive applied potential, suggesting that the photoexcited hole transfer was enhanced by upward band bending at the cocatalyst-photoelectrode interface. Structural changes of the MnO_x cocatalyst were found to depend on the UV photon intensity; thus, the observations of photoexcited electron transfer by XAFS are associated with the photoelectrochemical activity during water splitting.

Original language	English
Pages (from-to)	24302-24309
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	42
DOIs	https://doi.org/10.1021/jp507657p
Publication status	Published - 2014 Oct 23

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/jp507657p

Cite this

Yoshida, M., Yomogida, T., Mineo, T., Nitta, K., Kato, K., Masuda, T., Nitani, H., Abe, H., Takakusagi, S., Uruga, T., Asakura, K., Uosaki, K., & Kondoh, H. (2014). Photoexcited hole transfer to a MnO_x cocatalyst on a SrTiO₃ photoelectrode during oxygen evolution studied by in situ X-ray absorption spectroscopy. Journal of Physical Chemistry C, 118(42), 24302-24309. https://doi.org/10.1021/jp507657p

Yoshida, M, Yomogida, T, Mineo, T, Nitta, K, Kato, K, Masuda, T, Nitani, H, Abe, H, Takakusagi, S, Uruga, T, Asakura, K, Uosaki, K & Kondoh, H 2014, 'Photoexcited hole transfer to a MnO_x cocatalyst on a SrTiO₃ photoelectrode during oxygen evolution studied by in situ X-ray absorption spectroscopy', Journal of Physical Chemistry C, vol. 118, no. 42, pp. 24302-24309. https://doi.org/10.1021/jp507657p

@article{4dabc6a34afb4f609952d5ea6619af93,

title = "Photoexcited hole transfer to a MnOx cocatalyst on a SrTiO3 photoelectrode during oxygen evolution studied by in situ X-ray absorption spectroscopy",

abstract = "Photoexcited hole transfer to MnOx cocatalysts on SrTiO3 photoelectrodes was examined under controlled potential conditions during UV irradiation using in situ Mn K-edge X-ray absorption fine structure (XAFS) spectroscopy. The absorption edges of spectra were found to shift to higher energies during irradiation, indicating that MnOx cocatalysts were oxidized by the migration of photoexcited holes accompanied by a positive potential shift of the MnOx cocatalysts. This oxidation process was promoted by the application of a positive applied potential, suggesting that the photoexcited hole transfer was enhanced by upward band bending at the cocatalyst-photoelectrode interface. Structural changes of the MnOx cocatalyst were found to depend on the UV photon intensity; thus, the observations of photoexcited electron transfer by XAFS are associated with the photoelectrochemical activity during water splitting.",

author = "Masaaki Yoshida and Takumi Yomogida and Takehiro Mineo and Kiyofumi Nitta and Kazuo Kato and Takuya Masuda and Hiroaki Nitani and Hitoshi Abe and Satoru Takakusagi and Tomoya Uruga and Kiyotaka Asakura and Kohei Uosaki and Hiroshi Kondoh",

note = "Publisher Copyright: {\textcopyright} 2014 American Chemical Society.",

year = "2014",

month = oct,

day = "23",

doi = "10.1021/jp507657p",

language = "English",

volume = "118",

pages = "24302--24309",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

number = "42",

}

TY - JOUR

T1 - Photoexcited hole transfer to a MnOx cocatalyst on a SrTiO3 photoelectrode during oxygen evolution studied by in situ X-ray absorption spectroscopy

AU - Yoshida, Masaaki

AU - Yomogida, Takumi

AU - Mineo, Takehiro

AU - Nitta, Kiyofumi

AU - Kato, Kazuo

AU - Masuda, Takuya

AU - Nitani, Hiroaki

AU - Abe, Hitoshi

AU - Takakusagi, Satoru

AU - Uruga, Tomoya

AU - Asakura, Kiyotaka

AU - Uosaki, Kohei

AU - Kondoh, Hiroshi

PY - 2014/10/23

Y1 - 2014/10/23

N2 - Photoexcited hole transfer to MnOx cocatalysts on SrTiO3 photoelectrodes was examined under controlled potential conditions during UV irradiation using in situ Mn K-edge X-ray absorption fine structure (XAFS) spectroscopy. The absorption edges of spectra were found to shift to higher energies during irradiation, indicating that MnOx cocatalysts were oxidized by the migration of photoexcited holes accompanied by a positive potential shift of the MnOx cocatalysts. This oxidation process was promoted by the application of a positive applied potential, suggesting that the photoexcited hole transfer was enhanced by upward band bending at the cocatalyst-photoelectrode interface. Structural changes of the MnOx cocatalyst were found to depend on the UV photon intensity; thus, the observations of photoexcited electron transfer by XAFS are associated with the photoelectrochemical activity during water splitting.

AB - Photoexcited hole transfer to MnOx cocatalysts on SrTiO3 photoelectrodes was examined under controlled potential conditions during UV irradiation using in situ Mn K-edge X-ray absorption fine structure (XAFS) spectroscopy. The absorption edges of spectra were found to shift to higher energies during irradiation, indicating that MnOx cocatalysts were oxidized by the migration of photoexcited holes accompanied by a positive potential shift of the MnOx cocatalysts. This oxidation process was promoted by the application of a positive applied potential, suggesting that the photoexcited hole transfer was enhanced by upward band bending at the cocatalyst-photoelectrode interface. Structural changes of the MnOx cocatalyst were found to depend on the UV photon intensity; thus, the observations of photoexcited electron transfer by XAFS are associated with the photoelectrochemical activity during water splitting.

UR - http://www.scopus.com/inward/record.url?scp=84949115525&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84949115525&partnerID=8YFLogxK

U2 - 10.1021/jp507657p

DO - 10.1021/jp507657p

M3 - Article

AN - SCOPUS:84949115525

SN - 1932-7447

VL - 118

SP - 24302

EP - 24309

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 42

ER -