Increasing the Photocatalytic Hydrogen Generation Activity of CdS Nanorods by Introducing Interfacial and Polarization Electric Fields

Author:

Qi Zheng1,Chen Jinbao1,Li Qin1,Wang Ning2,Carabineiro Sónia A.C.3,Lv Kangle1ORCID

Affiliation:

1. College of Resources and Environment South‐Central Minzu University Wuhan 430074 P. R. China

2. Faculty of Environment and Life Beijing University of Technology Beijing 100124 P. R. China

3. Department of Chemistry NOVA School of Science and Technology Universidade NOVA de Lisboa Caparica 2829‐516 Portugal

Abstract

AbstractCadmium sulfide (CdS) is a photocatalyst widely used for efficient H2 production under visible light irradiation, due to its narrow bandgap and suitable conduction band position. However, the fast recombination of carriers results in their low utilization. In order to improve photocatalytic hydrogen production, it reports the successful introduction of metallic Cd and S vacancies on CdS nanorods (CdS NRs) by a facile in situ chemical reduction method, using a thermal treatment process. This procedure generates interfacial and polarization electric fields, that significantly improve the photocatalytic hydrogen production performance of CdS NRs in sodium sulfide and sodium sulfite aqueous solutions, under visible light irradiation (λ >420 nm). The introduction of these electric fields is believed to improve charge separation and facilitate faster interfacial charge migration, resulting in a significantly optimized catalyst, with a photocatalytic hydrogen evolution rate of up to 10.6 mmol−1 g−1 h−1 with apparent quantum efficiency (AQE) of 12.1% (420 nm), which is 8.5 times higher than that of CdS. This work provides a useful method to introduce metallic and S vacancies on metal sulfide photocatalysts to build local polarization and interfacial electric fields for high‐performance photocatalytic H2 production.

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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