Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 27, Pages 13340-13350Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.02.087
Keywords
Porphyrin; Cadmium sulfide nanoparticles; Photocatalytic hydrogen evolution; Metal organic frameworks
Categories
Funding
- China Postdoctoral Science Foundation [2020M681519]
- China Postdoctoral Science Spe-cial Foundation [2021T140284]
- National Natural Science Foundation of China [31971616]
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This study reports a novel photocatalyst composed of two-dimensional zinc porphyrin nanosheets and cadmium sulfide nanoparticles, which can efficiently utilize both visible and near-infrared light for photocatalytic hydrogen production.
The main challenge of photocatalysis is how to improve the coefficient of utilization and conversion rate for solar energy. Herein, we report a composite photocatalyst related to a novel porphyrin metal organic frameworks (MOFs), in which cadmium sulfide nano particles (CdS NPs) are grown in situ on the surface of two-dimensional (2D) zinc porphyrin nanosheets (Zn-TCPP NSs) by hydrothermal method. Interestingly, Zn-TCPP NSs and CdS NPs form a Type II heterojunction structure, which reduces the photogenerated electron hole recombination rate of CdS. Moreover, in the near-infrared region, the photo-excited electrons generated by Zn-TCPP NSs are transmitted to CdS NPs, so that cadmium sulfide can realize both visible light and near-infrared light for photocatalytic hydrogen production. The Zn-TCPP NSs not only has excellent light absorption capacity, but also has a unique frame design that effectively reduces the recombination rate of photoinduced electron hole pairs, thus improving the conversion rate of solar energy. As expected, the photocatalytic performance of the porphyrin MOFs modified materials is significantly enhanced compared to CdS NPs. The hydrogen production rate of the Pt@CdS NPs/Zn-TCPP NSs(C-Z-T) composite material in the visible light region is about 15.3 mmol g(-1) h(-1), which is 11 times for Pt@CdS NPs. Furthermore, the Pt@CdS NPs/Zn-TCPP NSs(C-Z-T) also has a considerable hydrogen production rate in the near-infrared region, such as 200 mmol g(-1) h(-1) at 600 nm, 90 mmol g(-1) h(-1) at 765 nm and 20 mmol g-1 h-1 at > 800 nm. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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