Citation: Song Ma, Xingmin Xu, Jun Xie, Xin Li. Improved visible-light photocatalytic H₂ generation over CdS nanosheets decorated by NiS₂ and metallic carbon black as dual earth-abundant cocatalysts[J]. Chinese Journal of Catalysis, ;2017, 38(12): 1970-1980. doi: 10.1016/S1872-2067(17)62965-6 shu

Improved visible-light photocatalytic H₂ generation over CdS nanosheets decorated by NiS₂ and metallic carbon black as dual earth-abundant cocatalysts

Song Ma ^a, ,
Xingmin Xu ^a ,
Jun Xie ^a,b ,
Xin Li ^a,b

a College of Materials and Energy, South China Agricultural University, Guangzhou 510642, Guangdong, China;
b College of Forestry and Landscape Architecture, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, Guangdong, China

Received Date: 9 October 2017
Revised Date: 31 October 2017

Fund Project: The work was supported by the National Natural Science Foundation of China (51672089), the Science and Technology Planning Project of Guangdong Province (2015B020215011), and the State Key Laboratory of Advanced Technology for Material Synthesis and Processing (Wuhan University of Technology) (2015-KF-7).

CdS nanosheets (NSs) photocatalysts modified with dual earth-abundant co-catalysts of metallic carbon black (CB) and NiS₂ were synthesized by a two-step solvother-mal/impregnation method. All the experiment results demonstrated that the co-loading of CB and NiS₂ could significantly enhance the photocatalytic H₂-evolution activity of CdS NSs. The photocatalytic performance of the as-prepared CdS/CB/NiS₂ samples was tested under visible light (λ ≥ 420 nm) by using an aqueous solution containing 0.25 mol L^-1 Na₂S-Na₂SO₃ as the sacrifice agent. The CdS-0.5% CB-1.0%NiS₂ composite photocatalysts exhibited the highest H₂-evolution rate of 166.7 μmol h^-1, which was approximately 5.16 and 1.87 times higher than those of pure CdS NSs and CdS-1.0%NiS₂, respectively. The possible mechanism for the enhanced H₂-evolution activity of CdS/CB/NiS₂ composite photocatalysts was proposed. The results showed that the enhanced photocatalytic H₂-evolution activities could be ascribed to the co-loading of metallic CB and NiS₂ as co-catalysts onto the surface of CdS NSs. The excellent synergetic effect between the CB and NiS₂ could obviously improve visible light absorption, promote separation of photogenerated electron-hole pairs and boost the H₂-evolution kinetics, thus leading to an enhanced activity for H₂ evolution. More interestingly, the metallic CB could not only act as a cocatalyst for H₂ evolution, but also serve as a conductive electron bridge to promote the charge migration. This work not only demonstrates that loading CB as a co-catalyst is a promising strategy to further boost the photocatalytic activity of CdS/NiS₂ composites, but also offers a new mechanistic insight into the construction of highly efficient and stable CdS NSs-based hybrid photocatalysts with dual earth-abundant co-catalysts for photocatalytic applications.
- Photocatalytic hydrogen evolution,
- CdS nanosheet,
- Carbon black,
- NiS₂,
- Dual co-catalyst
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Improved visible-light photocatalytic H₂ generation over CdS nanosheets decorated by NiS₂ and metallic carbon black as dual earth-abundant cocatalysts