期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 9, 页码 11869-11876出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b02153
关键词
Coordination polymer; NiSpg-C3N4 photocatalyst; Sulfur vacancy; Photothermal effect; H-2 production
资金
- National Natural Science Foundation of China [21303010, 21571132]
- Fundamental Research Funds for the Central University [N170504025]
To obtain the photocatalyst composed by sulfur vacancies rich NiS and graphitic carbon nitride (g-C3N4), a simple method has been found for using coordination polymer as precursor. Based on this strategy, an effective composite photocatalyst, NiSpg-C3N4, is synthesized successfully through the calcination of a Ni2+ based coordination polymer with 2-mercapto-5-propylpyrimidine as ligand. In this photocatalyst, the NiS nanoparticles with small size disperse evenly in 2-mercapto-5-propylpyrimidine derived g-C3N4. Electron paramagnetic resonance (EPR) suggests there are a lot of sulfur vacancies in NiS@g-C3N4. NiSpg-C3N4 exhibits intensive adsorption in the near-infrared region, which endows NiS@g-C3N4 with promising photothermal effect. With a 980 nm laser as light source (0.44 Wcm(-2)), the aqueous dispersion of NiSpg-C3N4 exhibits a temperature elevation of 56.7 degrees C with photothermal conversion efficiency of 58.2%. Under irradiation of simulated solar light, without Pt co-catalyst, NiS@g-C3N4 possesses a promising photocatalytic H-2 production rate, with the value 31.3 mmol.g(-1).h(-1). In five cycles of reactions for 30 h, the H-2 production rate remains constant. The synergy between sulfur vacancy and photothermal effect of NiS play significant roles in the enhancement of H-2 production property.
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