J. Mater. Sci. Technol. ›› 2025, Vol. 204: 152-165.DOI: 10.1016/j.jmst.2024.01.104

• Research Article • Previous Articles     Next Articles

Synthesis of interfacial electric field-enhanced CdS/CdxZn1-xS/ZnO ternary heterojunction by lye dissolution etching mechanism for photocatalytic H2 production and CO2 reduction

Qi Lia, Shengchao Yanga,*, Yufan Huanga, Yuwei Lianga, Chunling Hua, Min Wangb, Zhiyong Liua,*, Yanlong Taia,c, Jichang Liua,d, Yongsheng Lia,d,*   

  1. aSchool of Chemistry and Chemical Engineering, Shihezi University/Key Laboratory of Green Process for Chemical Engineering/Key Laboratory for Chemical Materials of Xinjiang Uygur Autonomous Region/Engineering Center for Chemical Materials of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, China;
    bShanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    cKey Laboratory of Human-Machine Intelligence-Synergy Systems of Chinese Academy of Sciences (CAS), Shenzhen Institutes of Advanced Technology, Shenzhen 518055, China;
    dLab of Low-Dimensional Materials Chemistry Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering, East China University of Science and Technology Shanghai, Shanghai 200237, China
  • Received:2023-11-06 Revised:2023-12-25 Accepted:2024-01-07 Published:2025-01-01 Online:2024-04-21
  • Contact: *E-mail addresses: shengchao.yang@shzu.edu.cn (S. Yang), lzyongclin@sina.com (Z. Liu), ysli@ecust.edu.cn (Y. Li).

Abstract: The difficulty in fabricating a multifaceted composite heterojunction system based on CdxZn1-xS limits the enhancement of photocatalytic performance. In the present scrutiny, novel ZnO/CdxZn1-xS/CdS composite heterojunctions are successfully prepared by the alkaline dissolution etching method. The internal electric field at the interface of I-type and Z-scheme heterojunction improved the effective charge separation. The ZC 8 sample exhibits excellent photocatalytic performance and the H2 production efficiency is 15.67 mmol g-1 h-1 with good stability up to 82.9 % in 24-hour cycles. The performance of CH4 and CO capacity in the CO2RR process is 3.47 μmol g-1 h-1 and 23.5 μmol g-1 h-1, respectively. The photogenerated accelerated charge transport is then examined in detail by in situ X-ray photoelectron spectroscopy (ISXPS) and density functional theory (DFT) calculations. This work presents a new idea for the synthesis of CdxZn1-xS solid-solution-based materials and provides a solid reference for the detailed mechanism regarding the electric field at the heterojunction interface.

Key words: Photocatalysis, Interface electric field, Composite heterostructure, Photocatalytic mechanism, CdxZn1-xS solid-solution