Ag2S/g-C3N4 composite photocatalysts for efficient Pt-free hydrogen production. The co-catalyst function of Ag/Ag2S formed by simultaneous photodeposition

作者：Jiang, Deli^*; Chen, Linlin; Xie, Jimin; Chen, Min

来源：Dalton Transactions, 2014, 43(12): 4878-4885.

DOI：10.1039/c3dt53526f

• GRAPHITIC CARBON NITRIDE
• IN-SITU SYNTHESIS
• H-2-PRODUCTION ACTIVITY
• FACILE SYNTHESIS
• H-2 EVOLUTION
• G-C3N4
• WATER
• CDS
• AG2S
• HETEROJUNCTIONS

Without Pt as cocatalyst, the photocatalytic hydrogen evolution activity of graphitic carbon nitride (g-C3N4) or even its composite is normally rather low (<1 mu mol h(-1)). Exploring Pt-free cocatalysts to substitute precious Pt is of great importance in the photocatalytic field. In the present work, Ag2S-modified g-C3N4 (Ag2S/g-C3N4) composite photocatalysts were prepared via a simple precipitation method. The results demonstrated that the photocatalytic H-2-production activity of g-C3N4 can be remarkably increased by the combination of Ag2S. The optimal Ag2S loading was found to be 5 wt%, giving a H-2 production of 10 mu mol h-1, around 100 times that of pure g-C3N4. The enhanced photocatalytic activity can be mainly attributed to the effective charge transfer between g-C3N4 and Ag/Ag2S, of which the latter is formed by simultaneous photodeposition in the photocatalytic H-2 evolution reaction and acts as an efficient co-catalyst for the g-C3N4. This work showed the possibility for utilization of Ag2S or Ag/Ag2S as a substitute for Pt in the photocatalytic production of H-2 using g-C3N4.

• 出版日期2014
• 单位江苏大学