Construction of S-Scheme heterojunction Ni11(HPO3)8(OH)6/CdS photocatalysts with open framework surface for enhanced H2 evolution activity

Shuhua Lv; Yuanyuan Sun; Dongzheng Liu; Caixia Song; Debao Wang

doi:10.1016/j.jcis.2022.12.041

Construction of S-Scheme heterojunction Ni₁₁(HPO₃)₈(OH)₆/CdS photocatalysts with open framework surface for enhanced H₂ evolution activity

J Colloid Interface Sci. 2023 Mar 15:634:148-158. doi: 10.1016/j.jcis.2022.12.041. Epub 2022 Dec 12.

Authors

Shuhua Lv¹, Yuanyuan Sun¹, Dongzheng Liu², Caixia Song³, Debao Wang⁴

Affiliations

¹ College of Materials Science and Engineering, Qingdao University of Science & Technology, Qingdao 266042, Shandong, PR China.
² College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
³ College of Materials Science and Engineering, Qingdao University of Science & Technology, Qingdao 266042, Shandong, PR China. Electronic address: songcaixia@qust.edu.cn.
⁴ College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China. Electronic address: dbwang@qust.edu.cn.

PMID: 36535154
DOI: 10.1016/j.jcis.2022.12.041

Abstract

The emerging S-scheme heterojunction shows a particular superiority in enhancing the efficiency of charge separation in photocatalyst. Herein, a Ni₁₁(HPO₃)₈(OH)₆/CdS heterojunctions (NiPO/CdS) are constructed for the first time by loading open framework structure NiPO on the surface of CdS nanoparticles (CdS NPs). The built-in electric field generated at the interface promotes the directional migration of photogenerated electrons from NiPO to CdS. This S-scheme pathway achieves a strong redox capacity and efficient carrier separation. More importantly, the unique triangular and hexagonal channels of NiPO facilitate the exposure of CdS active sites for proton adsorption, H₂ production and escape. The hydrogen evolution rate of NiPO/CdS is 39 mmol g^-1 h^-1 under visible light irradiation, which is 6.5 times higher than that of pure CdS. The NiPO/CdS heterojunction also exhibits remarkable long-term stability. This study provides a new strategy for the ingenious design of S-scheme photocatalysts with excellent photocatalytic performance.

Keywords: Carrier separation; CdS; Hydrogen evolution; Ni(11)(HPO(3))(8)(OH)(6); Photocatalysis; S-scheme heterojunction.