Hollow Multishell-Structured TiO2/MAPbI3 Composite Improves Charge Utilization for Visible-Light Photocatalytic Hydrogen Evolution

Wensheng Han; Yanze Wei; Jiawei Wan; Nobuyoshi Nakagawa; Dan Wang

doi:10.1021/acs.inorgchem.2c00253

Hollow Multishell-Structured TiO₂/MAPbI₃ Composite Improves Charge Utilization for Visible-Light Photocatalytic Hydrogen Evolution

Inorg Chem. 2022 Apr 4;61(13):5397-5404. doi: 10.1021/acs.inorgchem.2c00253. Epub 2022 Mar 21.

Authors

Wensheng Han^{1

2}, Yanze Wei¹, Jiawei Wan^{1

3}, Nobuyoshi Nakagawa², Dan Wang^{1

3}

Affiliations

¹ State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China.
² Graduate School of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
³ University of Chinese Academy of Sciences, Beijing 100049, P. R. China.

PMID: 35312311
DOI: 10.1021/acs.inorgchem.2c00253

Abstract

Interfacial photogenerated charge separation and transport have demonstrated great influence on photocatalytic performance. Herein, the composite photocatalysts of methylammonium lead iodide perovskite (MAPbI₃) in TiO₂ with a hollow multishell structure (HoMS) are designed and synthesized. The results indicate that the heterogeneous interface within the MAPbI₃/Pt/TiO₂-HoMS can help enhance the separation of photogenerated charges. HoMSs assembled with multiple shells can not only support large surfaces available for building a heterogeneous interface and photocatalytic reactions but also improve the light absorption capability of photocatalysts. Besides, the thin shell structure can also reduce the transmission distance of carriers so as to hinder charge recombination and improve charge utilization. As a result, samples of MAPbI₃/Pt/triple-shelled TiO₂ hollow structure displayed a H₂ yield of 6856.2 μmol h^-1 g^-1 under visible light, which is greatly better than that of bare MAPbI₃ (268.6 μmol h^-1 g^-1).