Expansion of the photoresponse window of a BiVO4 photocatalyst by doping with chromium(VI)

Kazuya Okuno; Hideki Kato; Junie Jhon M. Vequizo; Akira Yamakata; Hisayoshi Kobayashi; Makoto Kobayashi; Masato Kakihana

doi:10.1039/C8RA07830K

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Expansion of the photoresponse window of a BiVO₄ photocatalyst by doping with chromium(vi)†

Kazuya Okuno,^a Hideki Kato,

*^a Junie Jhon M. Vequizo,

^b Akira Yamakata,

*^b Hisayoshi Kobayashi,^c Makoto Kobayashi

^a and Masato Kakihana^a

Author affiliations

* Corresponding authors

^a Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
E-mail: hideki.kato.e2@tohoku.ac.jp

^b Graduate School of Engineering, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku-ku, Nagoya 468-8511, Japan
E-mail: yamakata@toyota-ti.ac.jp

^c Department of Chemistry and Materials Technology, Graduate School of Science and Technology, Kyoto Institute of Technology, Sakyo-ku, Kyoto 606-8585, Japan

Abstract

Doping of Cr⁶⁺ into BiVO₄ was examined in this study. A new absorption band with a 1.84 eV energy threshold appeared with Cr-doping. The theoretical band calculation has revealed that the new absorption is ascribed to the electron transition from the valence band to acceptor levels formed by empty Cr 3d orbitals. It was confirmed that photocatalytic water oxidation in the presence of Ag⁺ or Fe³⁺ of an oxidizing reagent was induced by excitation of the new absorption although activity under band gap excitation decreased with Cr-doping. Characteristics of carrier dynamics were also investigated by transient absorption spectroscopy.

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Article information

DOI: https://doi.org/10.1039/C8RA07830K
Article type: Paper
Submitted: 20 Sep 2018
Accepted: 02 Nov 2018
First published: 14 Nov 2018
This article is Open Access

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RSC Adv., 2018,8, 38140-38145

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Expansion of the photoresponse window of a BiVO₄ photocatalyst by doping with chromium(VI)

K. Okuno, H. Kato, J. Jhon M. Vequizo, A. Yamakata, H. Kobayashi, M. Kobayashi and M. Kakihana, RSC Adv., 2018, 8, 38140 DOI: 10.1039/C8RA07830K

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