Rational construction of a CdS/reduced graphene oxide/TiO2 core–shell nanostructure as an all-solid-state Z-scheme system for CO2 photoreduction into solar fuels

Libang Kuai; Yong Zhou; Wengguang Tu; Ping Li; Haijin Li; Qinfeng Xu; Lanqin Tang; Xiaoyong Wang; Min Xiao; Zhigang Zou

doi:10.1039/C5RA14374H

Rational construction of a CdS/reduced graphene oxide/TiO₂ core–shell nanostructure as an all-solid-state Z-scheme system for CO₂ photoreduction into solar fuels†

Libang Kuai,^abc Yong Zhou,*^abc Wengguang Tu,^bc Ping Li,^bc Haijin Li,^bce Qinfeng Xu,^b Lanqin Tang,^d Xiaoyong Wang,^b Min Xiao^b and Zhigang Zou*^bc

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* Corresponding authors

^a Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Nanjing University, Nanjing 210093, P. R. China
E-mail: zhouyong1999@nju.edu.cn

^b National Laboratory of Solid State Microstructures, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China
E-mail: zgzou@nju.edu.cn

^c Eco-materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing 210093, P. R. China

^d College of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 22401, P. R. China

^e School of Mathematics and Physics, Anhui University of Technology, Ma'anshan 243002, P. R. China

Abstract

Mimicking natural photosynthesis in green plants, an all-solid-state Z-scheme was constructed for photocatalytic reduction of CO₂ in the presence of water vapor, consisting of CdS nanospheres (CdS NSs) and TiO₂ nanoparticles as photocatalysts, and reduced graphene oxide (rGO) as a solid electron mediator. In this Z-scheme system, the photogenerated electrons from the conduction band of TiO₂ transfer to rGO, and then recombine with the existing holes of CdS NSs, allowing the photo-generated electrons to enrich on the CdS semiconductor and holes on the TiO₂. The photocatalytic efficiency of the Z-scheme system exhibits remarkable enhancement relative to pure CdS, CdS/TiO₂, and CdS/rGO.

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Rational construction of a CdS/reduced graphene oxide/TiO₂ core–shell nanostructure as an all-solid-state Z-scheme system for CO₂ photoreduction into solar fuels†

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Rational construction of a CdS/reduced graphene oxide/TiO₂ core–shell nanostructure as an all-solid-state Z-scheme system for CO₂ photoreduction into solar fuels

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