A new trick on an old support: Zr in situ defects-created carbon nitride for efficient electrochemical nitrogen fixation

• 作者: Wenwen Lin Siyu Yao Hao Chen Shenglai Li Yang Xia Yuan Yao Jing Li Dangguo Cheng Jie FU
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（2）
• 页码范围: 109-115
• 页数: 7页
• 语种: 英文

摘要

Electrochemical nitrogen reduction reaction (NRR) to produce ammonia under ambient conditions is considered as a promising approach to tackle the energy-intensive Haber-Bosch process,but the low Faradaic efficiency and yield of NH3 are still a challenge.Herein,a carbon-vacancies enriched mesoporous g-C3N4 is developed by an in situ Zr doping strategy.The in situ mesoporous-forming mechanism is deeply understood by TPSR to reveal the functions of Zr dopant that pulls C from the precursor of C3N4,resulting the formation of homogeneous mesopores with about 57％ of the one C-defective s-triazine ring in C3N4.Due to the defect sites obtained in metal doping synthesis,the RuAu bimetallic supported catalyst (RuAu3/0.3Zr-C3N4) exhibits effective NRR performance with a Faraday efficiency of 11.54％ and an NH3 yield of 5.28 μg h-1 mg-1cat.at-0.1 V (RHE),which is nearly 10 times higher than that of RuAu3/C3N4 catalyst.This work proposes a simple and template-free preparation method for the high defect density mesoporous C3N4,and provides new possibilities of a wide application of mesopore g-C3N4.