Facile synthesis of porous C-doped C3N4: fast charge separation and enhanced photocatalytic hydrogen evolution,New Journal of Chemistry

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Facile synthesis of porous C-doped C3N4: fast charge separation and enhanced photocatalytic hydrogen evolution
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-10-07 , DOI: 10.1039/d0nj04169f
Yabin Jiang _{1,

2,

3,

4} , Zhuogeng Lin _{1,

2,

3,

4} , Yuying Zhang _{1,

2,

3,

4} , Yuecheng Lai _{1,

2,

3,

4} , Dong Liang _{1,

2,

3,

4} , Chunzhen Yang _{1,

2,

3,

4}

Affiliation

Metal-free graphitic carbon nitride (g-C₃N₄) is a promising semiconductor material that can utilize visible light for photocatalytic hydrogen production. The photocatalytic activity can be further enhanced by improving the kinetics of photocarrier transfer and absorption efficiency of visible light. Herein, we demonstrate a facile strategy for the synthesis of C-doped g-C₃N₄ with porous hierarchical structure by simple co-pyrolyzation of acrylamide and dicyandiamide together. The addition of trace amount of acrylamide not only endows g-C₃N₄ with high porosity and specific surface area, but also promotes electron–hole separation and charge transfer due to the introduction of carbon dopant into the g-C₃N₄ structure. With 2 wt% of acrylamide in the precursor, the resulted C-doped g-C₃N₄ can deliver 3.4 times higher photocatalytic activity for hydrogen evolution than that of the bulk g-C₃N₄. Our present work provides valuable information for the performance-based optimization of composition and structural properties, as well as large scale production of high performance g-C₃N₄ photocatalysts.

中文翻译：

多孔C掺杂C3N4的简便合成：快速电荷分离和增强的光催化氢释放

无金属的石墨碳氮化物（gC ₃ N ₄）是一种有前途的半导体材料，可以利用可见光进行光催化制氢。通过改善光载流子传输动力学和可见光吸收效率，可以进一步提高光催化活性。在这里，我们证明了通过丙烯酰胺和双氰胺的简单共热解合成具有多孔分级结构的C掺杂gC ₃ N ₄的简便策略。添加微量的丙烯酰胺不仅赋予gC ₃ N ₄具有高的孔隙率和比表面积，但由于将碳掺杂剂引入gC ₃ N ₄结构，还促进了电子-空穴分离和电荷转移。与前体的丙烯酰胺2％（重量），所得到的C-掺杂GC ₃ Ñ ₄可以提供更高的3.4倍的光催化活性为析氢比散装GC的₃ Ñ ₄。我们目前的工作为基于性能的组成和结构性能的优化以及大规模生产高性能gC ₃ N ₄光催化剂提供了有价值的信息。

更新日期：2020-10-13

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