材料科学
铜
阴极
催化作用
法拉第效率
一氧化碳
碳纳米泡沫
化学工程
电化学
电极
纳米技术
二氧化碳电化学还原
制作
碳纤维
枝晶(数学)
复合材料
冶金
复合数
多孔性
有机化学
工程类
几何学
病理
物理化学
化学
医学
替代医学
数学
作者
Félix Urbain,Pengyi Tang,Nina M. Carretero,Teresa Andreu,Jordi Arbiol,Joan Ramón Morante
标识
DOI:10.1021/acsami.8b15379
摘要
The present study outlines the important steps to bring electrochemical conversion of carbon dioxide (CO2) closer to commercial viability by using a large-scale metallic foam electrode as a highly conductive catalyst scaffold. Because of its versatility, it was possible to specifically tailor three-dimensional copper foam through coating with silver dendrite catalysts by electrodeposition. The requirements of high-yield CO2 conversion to carbon monoxide (CO) were met by tuning the deposition parameters toward a homogeneous coverage of the copper foam with nanosized dendrites, which additionally featured crystallographic surface orientations favoring CO production. The presented results evidence that Ag dendrites, owing a high density of planes with stepped (220) surface sites, paired with the superior active surface area of the copper foam can significantly foster the CO productivity. In a continuous flow-cell reactor setup, CO Faradaic efficiencies reaching from 85 to 96% for a wide range of low applied cathode potentials (<1.0 VRHE) along with high CO current densities up to 27 mA/cm2 were achieved, far outperforming other tested scaffold materials. Overall, this research provides new strategic guidelines for the fabrication of efficient and versatile cathodes for CO2 conversion compatible with large-scale integrated prototype devices.
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