电合成
电催化剂
催化作用
氮气
法拉第效率
碳纤维
产量(工程)
热解
氨
氨生产
可逆氢电极
吸附
化学
无机化学
材料科学
电化学
化学工程
电极
复合数
工作电极
有机化学
物理化学
工程类
复合材料
冶金
作者
Cui‐Hua Zhao,Shengbo Zhang,Miaomiao Han,Xian Zhang,Yanyan Liu,Wenyi Li,Chun Chen,Guozhong Wang,Huijun Zhao
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2019-01-02
卷期号:4 (2): 377-383
被引量:137
标识
DOI:10.1021/acsenergylett.8b02138
摘要
Here we report that alfalfa-derived nitrogen-doped porous carbon (NPC) fabricated by a pyrolysis method is electrochemically active for the N2 reduction reaction (NRR) at ambient conditions. The results demonstrate that the obtained NPC material with a nitrogen content of 6.35 atom % at 500 °C (NPC-500) exhibits high NRR activity with an NH3 yield rate of 1.31 mmol h–1 g–1cat. and a Faradaic efficiency of 9.98% at −0.4 V (vs RHE) in 0.005 M H2SO4 solution. The isotopic labeling experimental results using 15N2 feed gas and 15NPC-500 reveal that the yielded NH3 indeed resulted from the NPC-500 catalyzed NRR, and the doped pyridinic-N also contributes NH3 formation during NRR. The experimental and theoretical calculations results indicate that the doped pyridinic-N in the NPC catalyst during NRR can break away from its surface to form N vacancies in a carbon matrix as the catalytic active sites for N2 adsorption and activation.
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