Citation: Feng Chen, Hui Yang, Xuefei Wang, Huogen Yu. Facile synthesis and enhanced photocatalytic H₂-evolution performance of NiS₂-modified g-C₃N₄ photocatalysts[J]. Chinese Journal of Catalysis, ;2017, 38(2): 296-304. doi: 10.1016/S1872-2067(16)62554-8 shu

Facile synthesis and enhanced photocatalytic H₂-evolution performance of NiS₂-modified g-C₃N₄ photocatalysts

Feng Chen ^a, ,
Hui Yang ^a ,
Xuefei Wang ^a ,
Huogen Yu ^a,b

a School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, Hubei, China;
b State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, Hubei, China

Received Date: 30 August 2016
Revised Date: 28 September 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21277107, 21477094, 51672203, 51472192), the Program for New Century Excellent Talents in University (NCET-13-0944), and the Fundamental Research Funds for the Central Universities (WUT 2015IB002).

NiS₂ is a promising cocatalyst to improve the photocatalytic performance of g-C₃N₄ for the production of H₂. However, the synthesis of the NiS₂ cocatalyst usually requires harsh conditions, which risks destroying the microstructures of the g-C₃N₄ photocatalysts. In this study, a facile and low-temperature (80℃) impregnation method was developed to prepare NiS₂/g-C₃N₄ photocatalysts. First, the g-C₃N₄ powders were processed by the hydrothermal method in order to introduce oxygen-containing functional groups (such as -OH and -CONH-) to the surface of g-C₃N₄. Then, the Ni²⁺ ions could be adsorbed near the g-C₃N₄ via strong electrostatic interaction between g-C₃N₄ and Ni²⁺ ions upon the addition of Ni(NO₃)₂ solution. Finally, NiS₂ nanoparticles were formed on the surface of g-C₃N₄ upon the addition of TAA. It was found that the NiS₂ nanoparticles were solidly and homogeneously grafted on the surface of g-C₃N₄, resulting in greatly improved photocatalytic H₂ production. When the amount of NiS₂ was 3 wt%, the resultant NiS₂/g-C₃N₄ photocatalyst showed the highest H₂ evolution rate (116.343 μmol h^-1 g^-1), which is significantly higher than that of the pure g-C₃N₄ (3 μmol h^-1 g^-1). Moreover, the results of a recycling test for the NiS₂/g-C₃N₄(3 wt%) sample showed that this sample could maintain a stable and effective photocatalytic H₂-evolution performance under visible-light irradiation. Based on the above results, a possible mechanism of the improved photocatalytic performance was proposed for the presented NiS₂/g-C₃N₄ photocatalysts, in which the photogenerated electrons of g-C₃N₄ can be rapidly transferred to the NiS₂ nanoparticles via the close and continuous contact between them; then, the photogenerated electrons rapidly react with H₂O adsorbed on the surface of NiS₂, which has a surficial metallic character and high catalytic activity, to produce H₂. Considering the mild and facile synthesis method, the presented low-cost and highly efficient NiS₂-modified g-C₃N₄ photocatalysts would have great potential for practical use in photocatalytic H₂ production.
- Photocatalysis,
- NiS₂,
- Graphite-like carbon-nitride,
- Cocatalyst,
- Visible-light photocatalytic hydrogen evolution
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Facile synthesis and enhanced photocatalytic H₂-evolution performance of NiS₂-modified g-C₃N₄ photocatalysts