A facile solvothermal recrystallization strategy engineering ultrathin g-C3N4 nanosheets for efficient boosting photocatalytic H2 evolution

Bingqi Chen, Xingjian Sun, Yuanzhi Hong, Yuwen Tian, Enli Liu, Junyou Shi, Xue Lin and Fucai Xia

Renewable Energy, 2024, vol. 237, issue PC

Abstract: Graphitic carbon nitride (g-C3N4) is a promising material for sustainable photocatalytic application, but the pristine g-C3N4 (P-C3N4) derived from thermal polymerization generally showed the relatively low photocatalytic activity. In order to obtain the desirable g-C3N4 photocatalyst, for the first time, we reported a simple solvothermal recrystallization strategy using ethanol as a green solvent for the preparation of high-performance ultrathin g-C3N4 nanosheets (labeled as 180-C3N4). The results indicated that the 180-C3N4 nanosheets with an average thickness of approximately 1.5 nm could be fabricated at an optimal solvothermal temperature of 180 °C. Comparted to P-C3N4, the resultant 180-C3N4 nanosheets possessed the faster charge mobility, enlarger specific surface area, and stronger redox capability. As a consequence, the 180-C3N4 nanosheets not only exhibited the significantly enhanced photocatalytic H2 generation performance under visible-light (λ > 420 nm) irradiation, but also showed the dramatically promoted photocatalytic H2 evolution activity both under blue (λ = 450 nm) and green (λ = 550 nm) light irradiation. This work highlights a facile “bottom-up” solvothermal recrystallization strategy for the large-scale production of highly active g-C3N4 materials, and it will play an important role in the field of clean H2 evolution and pollutant degradation by using renewable solar-driven photocatalysis technology.

Keywords: G-C3N4 nanosheets; Photocatalytic H2 evolution; Photocatalytic activity; Solvothermal recrystallization strategy (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:237:y:2024:i:pc:s0960148124018159

DOI: 10.1016/j.renene.2024.121747

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