Acta Phys. -Chim. Sin. ›› 2024, Vol. 40 ›› Issue (11): 2406026.doi: 10.3866/PKU.WHXB202406026

Special Issue: Solar fuel preparation

• ARTICLE • Previous Articles     Next Articles

Construction of 4-Amino-1H-imidazole-5-carbonitrile Modified Carbon Nitride-Based Donor-Acceptor Photocatalyst for Efficient Photocatalytic Hydrogen Evolution

Jingzhao Cheng1,2, Shiyu Gao1,2, Bei Cheng1,2, Kai Yang3, Wang Wang1,2,*(), Shaowen Cao1,2,*()   

  1. 1 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
    2 Hubei Technology Innovation Center for Advanced Composites, Wuhan University of Technology, Wuhan 430070, China
    3 School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
  • Received:2024-06-20 Revised:2024-07-25 Accepted:2024-07-26 Published:2024-10-14
  • Contact: Email: doublewang@whut.edu.cn (Wang Wang)swcao@whut.edu.cn (Shaowen Cao)
  • Supported by:
    the National Key R&D Program of China(2022YFE0114800); the National Natural Science Foundation of China(22278324); the National Natural Science Foundation of China(52073223); the Jiangxi Province "Double Thousand" Talent Training Plan(jxsq2023102141)

Abstract:

Photocatalytic hydrogen generation through water splitting driven by solar energy is regarded as a highly promising strategy to tackle the challenges of the energy crisis and environmental contamination. Tuning the electronic properties and band structures of photocatalysts is critical to improving the efficiency of charge separation and the activity of hydrogen production. Herein, donor-acceptor modified polymeric carbon nitride (CN)-based copolymers are synthesized via the introduction of 4-amino-1H-imidazole-5-carbonitrile (AICN) into the molecular skeleton of CN. The incorporation of electron donor AICN units can broaden the π-conjugated system and promote the spatial charge separation in the catalysts, thus resulting in enhanced light utilization and improved intramolecular charge carrier transfer rate. As a consequence, the AICN modified CN samples exhibit an increased photocatalytic hydrogen evolution rate, and the optimal photocatalytic activity can reach 3204 μmol·h−1·g−1. This molecular engineering strategy provides an effective avenue to develop high-performance CN-based photocatalysts for hydrogen evolution.

Key words: Polymeric carbon nitride, Donor-acceptor, Molecular modification, Charge separation, Hydrogen production