Surface polaron states on single-crystal rutile TiO2 nanorod arrays enhancing charge separation and transfer

Qimeng Yang; Heng Zhu; Yanghui Hou; Duanduan Liu; Huang Tang; Depei Liu; Weining Zhang; Shicheng Yan; Zhigang Zou

doi:10.1039/D0DT03068F

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Surface polaron states on single-crystal rutile TiO₂ nanorod arrays enhancing charge separation and transfer†

Qimeng Yang,‡^a Heng Zhu,‡^a Yanghui Hou,^a Duanduan Liu,^b Huang Tang,^a Depei Liu,

^b Weining Zhang,^b Shicheng Yan

*^a and Zhigang Zou^ab

Author affiliations

* Corresponding authors

^a Eco-Materials and Renewable Energy Research Center (ERERC), Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22, Hankou Road, Nanjing, Jiangsu 210093, P. R. China
E-mail: yscfei@nju.edu.cn

^b National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, No. 22, Hankou Road, Nanjing, Jiangsu 210093, P. R. China

Abstract

Polaron states on TiO₂ photoanodes provide an important electron transfer pathway at the electrode–electrolyte interface. Here, we electrochemically doped single-crystal rutile TiO₂ nanorod arrays with exposed (110) facets to produce surface polaron states, Ti³⁺–OH, which greatly contributed to charge separation and transfer. Our results experimentally clarified the previously confused understanding of the origin of improved photoelectrochemical (PEC) water splitting performance and verified that the enhanced PEC effects mainly arise from surface polaron states instead of grain boundary passivation.

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Article information

DOI: https://doi.org/10.1039/D0DT03068F
Article type: Paper
Submitted: 02 Sep 2020
Accepted: 12 Oct 2020
First published: 14 Oct 2020

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Dalton Trans., 2020,49, 15054-15060

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Surface polaron states on single-crystal rutile TiO₂ nanorod arrays enhancing charge separation and transfer

Q. Yang, H. Zhu, Y. Hou, D. Liu, H. Tang, D. Liu, W. Zhang, S. Yan and Z. Zou, Dalton Trans., 2020, 49, 15054 DOI: 10.1039/D0DT03068F

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Dalton Transactions