Spatial charge separated two-dimensional/two-dimensional Cu-In2S3/CdS heterojunction for boosting photocatalytic hydrogen production

Lei Yang; Tengyang Gao; Saisai Yuan; Ying Dong; Yiming Chen; Xijuan Wang; Chuanxiang Chen; Liang Tang; Teruhisa Ohno

doi:10.1016/j.jcis.2023.08.149

Spatial charge separated two-dimensional/two-dimensional Cu-In₂S₃/CdS heterojunction for boosting photocatalytic hydrogen production

J Colloid Interface Sci. 2023 Dec 15;652(Pt B):1503-1511. doi: 10.1016/j.jcis.2023.08.149. Epub 2023 Aug 24.

Authors

Lei Yang¹, Tengyang Gao², Saisai Yuan³, Ying Dong¹, Yiming Chen¹, Xijuan Wang¹, Chuanxiang Chen⁴, Liang Tang⁵, Teruhisa Ohno⁶

Affiliations

¹ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
² Key Laboratory of Organic Compound Pollution Control Engineering, Ministry of Education, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
³ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China. Electronic address: yuansaisai@just.edu.cn.
⁴ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China. Electronic address: cxchen@just.edu.cn.
⁵ Key Laboratory of Organic Compound Pollution Control Engineering, Ministry of Education, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China. Electronic address: tang1liang@shu.edu.cn.
⁶ Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.

PMID: 37659318
DOI: 10.1016/j.jcis.2023.08.149

Abstract

Two-dimensional (2D) beta indium sulfide (β-In₂S₃) shows great potential in photocatalytic hydrogen production due to its broad-spectrum response, relatively negative conduction band edge, high carrier mobility and low toxicity. However, the high charge recombination rate limits the application of In₂S₃. Here, we in-situ grew 2D cadmium sulfide (CdS) on the surface of In₂S₃ doped with copper ions (Cu²⁺) to construct a heterojunction photocatalyst that suppresses charge recombination. The in-situ grown method and shared sulfur composition were conducive to forming the efficient interface contact between In₂S₃ and CdS, promoting charge transfer and showing the high spatial charge separation rate, resulting in a hydrogen production rate of 868 µmol g^-1h^-1. The induced Cu²⁺ extended the light absorption range and stabilized the photocatalyst. By creating stable 2D/2D heterojunction photocatalysts with high charge separation efficiency, this work opens new possibilities for applying In₂S₃ materials in photocatalytic hydrogen production.

Keywords: Charge separation; Heterojunction; In-situ; Photocatalytic hydrogen production; Two-dimensional In(2)S(3).