期刊
CHEMICAL ENGINEERING JOURNAL
卷 404, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126477
关键词
Photothermal effect; Photocatalytic hydrogen evolution; Physical and chemical mechanism
资金
- National Basic Research Program of China [2014CB931700]
- State Key Laboratory of Optoelectronic Materials and Technologies
The contribution of the photothermal effect in enhancing solar water splitting was investigated using SnSe nanoparticles as hot islands on a ZnIn2S4 monolayer. Experimental results showed that the photothermal effect plays an auxiliary role in improving photocatalytic performance by accelerating the reaction and increasing temperature. The study provides insight into the mechanism with experimental evidence and lays a foundation for further investigation of the role of the photothermal effect in photocatalysis.
The contribution of the photothermal effect has been found to enhance solar water splitting. However, the in-depth experimental exploration of the physical and chemical mechanisms is challenging. Herein, an ideal model of photothermal material SnSe nanoparticles acting as hot islands on ZnIn2S4 monolayer was considered as an example for investigation. Compared to pristine ZnIn2S4, SnSe/ZnIn2S4 exhibited further improved photocatalytic activity upon the addition of near-infrared (NIR) light under visible irradiation due to the photothermal contribution; indicating that the photothermal effect plays an auxiliary role in the enhancement of the photocatalytic performance. Furthermore, hot islands can induce an increase in temperature to accelerate the photocatalytic reaction, and the photothermal contribution is as high as 11.8% by NIR illumination. More importantly, a series of experiments were designed under additional light conditions to investigate the photocatalytic mechanism of the photothermal influence, which included the charge density, the carrier transport and the charge carrier mobility. This study provides insight into the mechanism with favourable experimental evidence and lays a foundation for further investigation of the role of the photothermal effect in photocatalysis.
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