Polycondensation of ammonium thiocyanate into novel porous g-C3N4 nanosheets as photocatalysts for enhanced hydrogen evolution under visible light irradiation

doi:10.1016/S1872-2067(16)62509-3

Abstract

Abstract:

Porous graphitic carbon nitride (pg-C₃N₄) nanosheets have been prepared through a one-step am-monia thermopolymerization method. The effects of synthetic temperature on the structural, optical and photocatalytic properties of the samples have been investigated. Characterization results show that the heptazine-based conjugate heterocyclic structure was formed over 500℃, which is at-tributed to the inhibitory effect of ammonia from the decomposition of NH₄SCN. Precise nanosheet morphology and an increased pore distribution with an enlarged surface area are observed for the samples obtained under high temperatures. Optical analysis results show that the bandgap of the samples widens and photoluminescene intensity is gradually quenched as the treating temperature is increased. The results demonstrate that a higher polymerization temperature improves the nanolayer structure, porosity and migration rate of the photo-induced carriers of the samples. The pg-C₃N₄ nanosheets prepared at 600℃ presents the highest photocatalytic activity for hydrogen evolution from water under visible-light irradiation. This study demonstrates a novel strategy for the synthesis and optimization of polymer semiconductor nanosheets with gratifying photocatalytic performance.

Key words: Carbon nitride, Nanosheet, Semiconductor, Ammonia, Photocatalysis, Hydrogen evolution

Yanjuan Cui, Yuxiong Wang, Hao Wang, Fu Cao, Fangyan Chen. Polycondensation of ammonium thiocyanate into novel porous g-C₃N₄ nanosheets as photocatalysts for enhanced hydrogen evolution under visible light irradiation[J]. Chinese Journal of Catalysis, 2016, 37(11): 1899-1906.

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https://www.cjcatal.com/EN/Y2016/V37/I11/1899

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Polycondensation of ammonium thiocyanate into novel porous g-C₃N₄ nanosheets as photocatalysts for enhanced hydrogen evolution under visible light irradiation

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