Synthesis of g-C3N4 from Various Precursors for Photocatalytic H2 Evolution under the Visible Light

作者：Pengfei Xia, Guojing Li, Xiaowei Li, Shuhua Yuan, Kang Wang, Dingwang Huang, Yuanpeng Ji, Yunfa Dong, Xiaoqiang Wu, Linyu Zhu, Weidong He, Liang Qiao · 发表于：Crystals · 年份：2022 · DOI：10.3390/cryst12121719 · 被引用次数：45 · 研究领域：Advanced Photocatalysis Techniques、Perovskite Materials and Applications、2D Materials and Applications

Graphitic carbon nitride (g-C3N4) fabricated from different precursors exhibits unique microstructures and photocatalytic performance under visible light. Herein, we synthesized five different microstructures of g-C3N4 by the thermal poly condensation method using guanidine hydrochloride, melamine, urea, dicyandiamide and thiourea as the precursors. The results indicated that g-C3N4 prepared from urea precursor (UCN) has a nanostructure, porous layered structure, large specific surface area, and high separation efficiency of photo generated hole-electron pairs, which showed the best photocatalytic activity among all of the as-prepared samples. As for the lowest cost among the above five precursors, urea is an ideal candidate material for preparing g-C3N4 photocatalyst for a huge potential of wide industrial applications. In addition, Pt or Ni were used as the co-catalyst and loaded onto the g-C3N4 surface for photocatalytic hydrogen production. In comparison with noble metal Pt co-catalyst, Ni co-catalyst is inexpensive and has a significant effect o enhancing the photocatalytic activity under visible light. Therefore, Ni exhibits a considerable prospect to replace noble metal co-catalysts in the photocatalytic reactions.