Elucidation of the electron energy structure of TiO2(B) and anatase photocatalysts through analysis of electron trap density

Haruki Nagakawa; Tsuyoshi Ochiai; He Ma; Changhua Wang; Xintong Zhang; Yang Shen; Mai Takashima; Bunsho Ohtani; Morio Nagata

doi:10.1039/D0RA02587A

Elucidation of the electron energy structure of TiO₂(B) and anatase photocatalysts through analysis of electron trap density†

Haruki Nagakawa,

^a Tsuyoshi Ochiai,

^bc He Ma,^d Changhua Wang,^d Xintong Zhang,

^d Yang Shen,^e Mai Takashima,

^ef Bunsho Ohtani

^ef and Morio Nagata

*^a

Author affiliations

* Corresponding authors

^a Department of Industrial Chemistry, Graduate School of Engineering, Tokyo University of Science, 12-1 Ichigayafunagawara-cho, Shinjuku-ku, Tokyo 162-0826, Japan
E-mail: nagata@ci.tus.ac.jp

^b Materials Analysis Group, Research and Development Department, Local Independent Administrative Agency, Kanagawa Institute of industrial Science and TEChnology (KISTEC), Kanagawa 213-0012, Japan

^c Photocatalysis International Research Center, Tokyo University of Science, Chiba 278-8510, Japan
E-mail: ochiai.tsuyoshi@gmail.com

^d Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024 China
E-mail: xtzhang@nenu.edu.cn

^e Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan

^f Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
E-mail: ohtani@cat.hokudai.ac.jp
Fax: +81-11-706-9133

Abstract

A clear understanding of the electron energy structure of TiO₂(B)/anatase is needed to study the related catalytic reactions and design new composite photocatalysts. In this study, the electron energy structures of TiO₂(B) and anatase were estimated by analyzing the energy-resolved distribution of electron traps measured by reversed double-beam photoacoustic spectroscopy. In the mixture of TiO₂(B) and anatase, interfacial charge-transfer excitation from anatase to electron traps of TiO₂(B) was suggested. By analyzing this for TiO₂(B), the electron level with a relatively high density of states was found to be located ∼0.07 eV deeper than that for anatase. Furthermore, a similar electron energy structure was suggested for a composite photocatalyst having a mixed phase of TiO₂(B) and anatase.

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Article information

DOI: https://doi.org/10.1039/D0RA02587A
Article type: Paper
Submitted: 20 Mar 2020
Accepted: 07 May 2020
First published: 15 May 2020
This article is Open Access

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RSC Adv., 2020,10, 18496-18501

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Elucidation of the electron energy structure of TiO₂(B) and anatase photocatalysts through analysis of electron trap density

H. Nagakawa, T. Ochiai, H. Ma, C. Wang, X. Zhang, Y. Shen, M. Takashima, B. Ohtani and M. Nagata, RSC Adv., 2020, 10, 18496 DOI: 10.1039/D0RA02587A

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