材料科学
法拉第效率
催化作用
密度泛函理论
碳纤维
二氧化碳电化学还原
兴奋剂
热解
电化学
化学工程
纳米材料
无机化学
电极
纳米技术
有机化学
物理化学
化学
计算化学
一氧化碳
复合材料
光电子学
工程类
复合数
作者
Xingpu Wang,Xueyan Li,Shaosong Ding,Yalan Chen,Long You,Mingwei Fang,Guozheng Xiao,Ying Zhu
出处
期刊:Nano Energy
[Elsevier]
日期:2021-12-01
卷期号:90: 106541-106541
被引量:20
标识
DOI:10.1016/j.nanoen.2021.106541
摘要
Seeking catalysts with high density of active sites of N-doped carbon nanomaterials is desired for effective conversion of CO2 to CO. Here, the density functional theory (DFT) calculation is employed to investigate the formation energy and chemical potential of N species from different N-containing carbon precursors. It is found that the hybrid precursors facilitate to form high density of the pyridinic-N active sites, owing to its lower formation energy of pyridinic-N. Accordingly, we develop a hybridization strategy of precursors to fabricate the N-doped porous carbon (NPC) with a pyridinic-N content of 2.86 wt% by ball milling of the poly(aniline-co-pyrrole) copolymer in the presence salt templets, followed by pyrolysis. As expected, the optimized NPC1:0.5 exhibits an excellent activity toward CO2RR with the CO Faradaic efficiency of ∼95.3% and a high CO current density of 4.3 mA cm−2, higher than most of the previous reports. Besides, this NPC had CO current density of 115.9 mA cm−2 and a long-term stability for 20 h in flow cell. The experiments and DFT calculation show that the pyridinic-N species act as active sites for CO2RR. In addition, 2p electrons of pyridinic-N species promote *COOH intermediate release to enhance CO2 conversion toward CO.
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