Efficient flower-like ZnSe/Cu<sub>0.08</sub>Zn<sub>0.92</sub>S photocatalyst for hydrogen production application

doi:10.1007/s11705-022-2295-3

Front. Chem. Sci. Eng.

2023, Vol. 17

Issue (9) : 1301-1310 https://doi.org/10.1007/s11705-022-2295-3

RESEARCH ARTICLE

Efficient flower-like ZnSe/Cu_0.08Zn_0.92S photocatalyst for hydrogen production application

Ying Wang¹, Yue Han¹, Ruiyang Zhao³(

), Jishu Han¹(

), Lei Wang^1,²

¹. Key Laboratory of Eco-chemical Engineering, Ministry of Education, International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
². Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection, College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
³. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

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Abstract

Photocatalytic hydrogen production utilizing abundant solar energy to produce high-calorie, clean, and pollution-free hydrogen is an important approach to solving environmental and resource problems. In this work, a high-efficiency flower-like ZnSe/Cu_0.08Zn_0.92S photocatalyst was constructed through element doping and the formation of a Z-scheme heterojunction. The synergistic effect of Cu doping and the built-in electric field in the heterojunction enhanced light absorption and utilization by the ZnSe/Cu_0.08Zn_0.92S microflowers, accelerated the separation and transfer of photogenerated electrons and effectively inhibited electron–hole recombination. Thus the photocatalytic hydrogen production ability of the ZnSe/Cu_0.08Zn_0.92S microflowers was increased significantly. The highly stable ZnSe/Cu_0.08Zn_0.92S microflowers could provide excellent catalysis of photocatalytic hydrogen production.

Keywords photocatalysis Cu_0.08Zn_0.92S ZnSe hydrogen production

Corresponding Author(s): Ruiyang Zhao,Jishu Han

About author:

^* These authors contributed equally to this work.

Online First Date: 28 April 2023 Issue Date: 29 August 2023

Cite this article:

Ying Wang,Yue Han,Ruiyang Zhao, et al. Efficient flower-like ZnSe/Cu_0.08Zn_0.92S photocatalyst for hydrogen production application[J]. Front. Chem. Sci. Eng., 2023, 17(9): 1301-1310.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2295-3
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I9/1301

Fig.1 Schematic diagram for the preparation of ZnSe/Cu_0.08Zn_0.92S.

Fig.2 SEM image of the (a) Cu_0.08Zn_0.92S microflowers, (b) TEM image of the ZnSe QDs, (c) SEM and (d) high-resolution TEM images of the ZnSe/Cu_0.08Zn_0.92S microflowers.

Fig.3 STEM image of (a) ZnSe/Cu_0.08Zn_0.92S microflower and the corresponding elemental mapping images for (b) Zn, (c) S, (d) Cu and (e) Se.

Fig.4 XRD patterns for ZnSe, Cu_0.08Zn_0.92S and ZnSe/Cu_0.08Zn_0.92S microflowers.

Fig.5 High-resolution (a) Cu 2p, (b) Zn 2p, (c) Se 3d and (d) S 2p XPS spectra for ZnSe/Cu_0.08Zn_0.92S microflowers.

Fig.6 UV–vis absorption spectra of (a) Cu_0.08Zn_0.92S, ZnSe and three kinds of ZnSe/Cu_0.08Zn_0.92S, (b) the bandgaps for Cu_0.08Zn_0.92S and (c) ZnSe.

Fig.7 (a) Photocatalytic hydrogen production levels of Cu_0.08Zn_0.92S, ZnSe/Cu_0.08Zn_0.92S-1, ZnSe/Cu_0.08Zn_0.92S-2 and ZnSe/Cu_0.08Zn_0.92S-3, (b) photocatalytic hydrogen production levels of ZnSe/Cu_0.08Zn_0.92S-2 over 6 h with different masses, (c) cycling experiment for photocatalytic hydrogen production by ZnSe/Cu_0.08Zn_0.92S-2, and (d) XRD patterns for ZnSe/Cu_0.08Zn_0.92S-2 before and after the cycling experiment.

Fig.8 (a) Electrochemical impedance spectroscopy, (b) photocurrent response spectra and (c) time-resolved transient PL decays of Cu_0.08Zn_0.92S, ZnSe and ZnSe/Cu_0.08Zn_0.92S microflowers.

Fig.9 Mott–Schottky curves for (a) Cu_0.08Zn_0.92S and (b) ZnSe QDs, ultraviolet photoelectron spectra of (c) Cu_0.08Zn_0.92S and (d) ZnSe QDs.

Fig.10 Schematic diagram of the proposed mechanism for photocatalytic H₂ production by the ZnSe/Cu_0.08Zn_0.92S microflowers.

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