Cobalt Aluminate Spinel as a Cocatalyst for Photocatalytic Oxidation of Water: Significant Hole-Trapping Effect

Tomoki Kanazawa; Kosaku Kato; Ryusei Yamaguchi; Tomoki Uchiyama; Daling Lu; Shunsuke Nozawa; Akira Yamakata; Yoshiharu Uchimoto; Kazuhiko Maeda

doi:10.1021/acscatal.0c00944

Cobalt Aluminate Spinel as a Cocatalyst for Photocatalytic Oxidation of Water: Significant Hole-Trapping Effect

Tomoki Kanazawa, Kosaku Kato, Ryusei Yamaguchi, Tomoki Uchiyama, Daling Lu, Shunsuke Nozawa, Akira Yamakata, Yoshiharu Uchimoto, Kazuhiko Maeda

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

23 Citations (Scopus)

Abstract

Here we show that nanoparticulate CoAl₂O₄ spinel serves as an efficient cocatalyst for photocatalytic oxidation of water. The O₂ evolution activity of CoAl₂O₄/g-C₃N₄ from an aqueous solution of AgNO₃ under visible light irradiation was ∼10 times that of unmodified g-C₃N₄ and also exceeded that of an analogue modified with a well-known Co₃O₄ cocatalyst for each optimal preparation condition. Transient absorption spectroscopy indicated that the CoAl₂O₄ cocatalyst with Co²⁺ as the main cobalt species at the A site of the spinel possessed better hole-capturing properties than the Co₃O₄ cocatalyst, which was the main reason for the improved water-oxidation performance.

Original language	English
Pages (from-to)	4960-4966
Number of pages	7
Journal	ACS Catalysis
Volume	10
Issue number	9
DOIs	https://doi.org/10.1021/acscatal.0c00944
Publication status	Published - May 1 2020
Externally published	Yes

Keywords

artificial photosynthesis
mixed anion compounds
solar fuels
visible light
water splitting

ASJC Scopus subject areas

Catalysis
Chemistry(all)

UN SDGs

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

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10.1021/acscatal.0c00944

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title = "Cobalt Aluminate Spinel as a Cocatalyst for Photocatalytic Oxidation of Water: Significant Hole-Trapping Effect",

abstract = "Here we show that nanoparticulate CoAl2O4 spinel serves as an efficient cocatalyst for photocatalytic oxidation of water. The O2 evolution activity of CoAl2O4/g-C3N4 from an aqueous solution of AgNO3 under visible light irradiation was ∼10 times that of unmodified g-C3N4 and also exceeded that of an analogue modified with a well-known Co3O4 cocatalyst for each optimal preparation condition. Transient absorption spectroscopy indicated that the CoAl2O4 cocatalyst with Co2+ as the main cobalt species at the A site of the spinel possessed better hole-capturing properties than the Co3O4 cocatalyst, which was the main reason for the improved water-oxidation performance.",

keywords = "artificial photosynthesis, mixed anion compounds, solar fuels, visible light, water splitting",

author = "Tomoki Kanazawa and Kosaku Kato and Ryusei Yamaguchi and Tomoki Uchiyama and Daling Lu and Shunsuke Nozawa and Akira Yamakata and Yoshiharu Uchimoto and Kazuhiko Maeda",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research on Innovative Area “Mixed Anion (Project JP16H06441, JP17H05491 and JP19H04708)” and “ILEC” (Project JP17H06438) from the Japan Society for the Promotion of Science (JSPS). It was also partially supported by a Grant-in-Aid for Scientific Research (B) (Project JP19H02511) and for Challenging Research (Exploratory) (JP17K19169). T.K. wishes to acknowledge the support of a JSPS Fellowship for Young Scientists (JP18J10548). 4 Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",

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doi = "10.1021/acscatal.0c00944",

language = "English",

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T1 - Cobalt Aluminate Spinel as a Cocatalyst for Photocatalytic Oxidation of Water

T2 - Significant Hole-Trapping Effect

AU - Kanazawa, Tomoki

AU - Kato, Kosaku

AU - Yamaguchi, Ryusei

AU - Uchiyama, Tomoki

AU - Lu, Daling

AU - Nozawa, Shunsuke

AU - Yamakata, Akira

AU - Uchimoto, Yoshiharu

AU - Maeda, Kazuhiko

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research on Innovative Area “Mixed Anion (Project JP16H06441, JP17H05491 and JP19H04708)” and “ILEC” (Project JP17H06438) from the Japan Society for the Promotion of Science (JSPS). It was also partially supported by a Grant-in-Aid for Scientific Research (B) (Project JP19H02511) and for Challenging Research (Exploratory) (JP17K19169). T.K. wishes to acknowledge the support of a JSPS Fellowship for Young Scientists (JP18J10548). 4 Publisher Copyright: Copyright © 2020 American Chemical Society.

PY - 2020/5/1

Y1 - 2020/5/1

N2 - Here we show that nanoparticulate CoAl2O4 spinel serves as an efficient cocatalyst for photocatalytic oxidation of water. The O2 evolution activity of CoAl2O4/g-C3N4 from an aqueous solution of AgNO3 under visible light irradiation was ∼10 times that of unmodified g-C3N4 and also exceeded that of an analogue modified with a well-known Co3O4 cocatalyst for each optimal preparation condition. Transient absorption spectroscopy indicated that the CoAl2O4 cocatalyst with Co2+ as the main cobalt species at the A site of the spinel possessed better hole-capturing properties than the Co3O4 cocatalyst, which was the main reason for the improved water-oxidation performance.

AB - Here we show that nanoparticulate CoAl2O4 spinel serves as an efficient cocatalyst for photocatalytic oxidation of water. The O2 evolution activity of CoAl2O4/g-C3N4 from an aqueous solution of AgNO3 under visible light irradiation was ∼10 times that of unmodified g-C3N4 and also exceeded that of an analogue modified with a well-known Co3O4 cocatalyst for each optimal preparation condition. Transient absorption spectroscopy indicated that the CoAl2O4 cocatalyst with Co2+ as the main cobalt species at the A site of the spinel possessed better hole-capturing properties than the Co3O4 cocatalyst, which was the main reason for the improved water-oxidation performance.

KW - artificial photosynthesis

KW - mixed anion compounds

KW - solar fuels

KW - visible light

KW - water splitting

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Cobalt Aluminate Spinel as a Cocatalyst for Photocatalytic Oxidation of Water: Significant Hole-Trapping Effect

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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