过电位
法拉第效率
催化作用
材料科学
石墨烯
二氧化碳电化学还原
贵金属
电化学
一氧化碳
化学工程
密度泛函理论
无机化学
碳纤维
纳米技术
氮气
化学
电极
复合材料
物理化学
有机化学
计算化学
工程类
复合数
作者
Jingjie Wu,Mingjie Liu,Pranav P. Sharma,Ram Manohar Yadav,Lulu Ma,Yingchao Yang,Xiaolong Zou,Xiao‐Dong Zhou,Róbert Vajtai,Boris I. Yakobson,Jun Lou,Pulickel M. Ajayan
出处
期刊:Nano Letters
[American Chemical Society]
日期:2015-12-09
卷期号:16 (1): 466-470
被引量:453
标识
DOI:10.1021/acs.nanolett.5b04123
摘要
The practical recycling of carbon dioxide (CO2) by the electrochemical reduction route requires an active, stable, and affordable catalyst system. Although noble metals such as gold and silver have been demonstrated to reduce CO2 into carbon monoxide (CO) efficiently, they suffer from poor durability and scarcity. Here we report three-dimensional (3D) graphene foam incorporated with nitrogen defects as a metal-free catalyst for CO2 reduction. The nitrogen-doped 3D graphene foam requires negligible onset overpotential (−0.19 V) for CO formation, and it exhibits superior activity over Au and Ag, achieving similar maximum Faradaic efficiency for CO production (∼85%) at a lower overpotential (−0.47 V) and better stability for at least 5 h. The dependence of catalytic activity on N-defect structures is unraveled by systematic experimental investigations. Indeed, the density functional theory calculations confirm pyridinic N as the most active site for CO2 reduction, consistent with experimental results.
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