Citation: Feng Chen, Hui Yang, Wei Luo, Ping Wang, Huogen Yu. Selective adsorption of thiocyanate anions on Ag-modified g-C₃N₄ for enhanced photocatalytic hydrogen evolution[J]. Chinese Journal of Catalysis, ;2017, 38(12): 1990-1998. doi: 10.1016/S1872-2067(17)62971-1 shu

Selective adsorption of thiocyanate anions on Ag-modified g-C₃N₄ for enhanced photocatalytic hydrogen evolution

Feng Chen ^a, ,
Hui Yang ^a ,
Wei Luo ^a ,
Ping 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: 7 October 2017
Revised Date: 30 October 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (51472192, 21477094, 21771142) and the Fundamental Research Funds for the Central Universities (WUT 2017IB002).

Silver-modified semiconductor photocatalysts typically exhibit enhanced photocatalytic activity toward the degradation of organic substances. In comparison, their hydrogen-evolution rates are relatively low owing to poor interfacial catalytic reactions to producing hydrogen. In the present study, thiocyanate anions (SCN^-) as interfacial catalytic active sites were selectively adsorbed onto the Ag surface of g-C₃N₄/Ag photocatalyst to promote interfacial H₂-evolution reactions. The thiocyanate-modified g-C₃N₄/Ag (g-C₃N₄/Ag-SCN) photocatalysts were synthesized via photodeposition of metallic Ag on g-C₃N₄ and subsequent selective adsorption of SCN^- ions on the Ag surface by an impregnation method. The resulting g-C₃N₄/Ag-SCN photocatalysts exhibited considerably higher photocatalytic H₂-evolution activity than the g-C₃N₄, g-C₃N₄/Ag, and g-C₃N₄/SCN photocatalysts. Furthermore, the g-C₃N₄/Ag-SCN photocatalyst displayed the highest H₂-evolution rate (3.9 μmol h^-1) when the concentration of the SCN^- ions was adjusted to 0.3 mmol L^-1. The H₂-evolution rate obtained was higher than those of g-C₃N₄ (0.15 μmol h^-1) and g-C₃N₄/Ag (0.71 μmol h^-1). Considering the enhanced performance of g-C₃N₄/Ag upon minimal addition of SCN^- ions, a synergistic effect of metallic Ag and SCN^- ions is proposed-the Ag nanoparticles act as an effective electron-transfer mediator for the steady capture and rapid transportation of photogenerated electrons, while the adsorbed SCN^- ions serve as an interfacial active site to effectively absorb protons from solution and promote rapid interfacial H₂-evolution reactions. Considering the present facile synthesis and its high efficacy, the present work may provide new insights into preparing high-performance photocatalytic materials.
- Photocatalysis,
- g-C₃N₄/Ag,
- Selective adsorption,
- Interfacial active site,
- Photocatalytic hydrogen evolution
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Selective adsorption of thiocyanate anions on Ag-modified g-C₃N₄ for enhanced photocatalytic hydrogen evolution