Electrocatalytic activity of Cu electrode in electroreduction of CO2
Electrocatalytic activity of Cu electrode in electroreduction of CO2
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DOI：
10.1016/s0013-4686(01)00527-8
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发表时间：
2001-06-15
影响因子：
6.6
通讯作者：
Tak, Y
中科院分区：
文献类型：
--
作者：
Lee, J;Tak, Y
研究了铜电极对CO2电化学还原的电催化活性。采用石英晶体微天平原位电化学方法，通过反应物的吸附/脱附行为研究了CO2的电还原机理。（EQCM）和通过非原位SEM、AES和XRD分析测量的表面变化。CO2在Cu上的阴极还原过程中，无定形碳的吸附被观察到。在恒定阴极电位下电解1h后，无定形碳的中毒导致生成CH 4和C2 H4等碳氢化合物的法拉第效率下降。另一方面，电位调制法引起了铜表面结构的变化，即氧化亚铜（Cu 2 O）的形成。这种结构变化阻止了无定形石墨的吸附，并在长期电解中获得恒定的甲烷产率。(C)2001爱思唯尔科技有限公司版权所有。
The electrocatalytic activity of Cu electrode in the electrochemical reduction of carbon dioxide (CO2) was investigated. Electroreduction mechanism of CO2 was studied by the adsorption/desorption behaviors of reacting species by using an in-situ electrochemical quartz crystal microbalance. (EQCM) and the surface changes measured by ex-situ SEM, AES, and XRD analysis. During cathodic reduction of CO2 on Cu, the adsorption of amorphous carbon was observed. After electrolysis time of 1 h at constant cathodic potential, the poisoning of amorphous carbon resulted in the decrease of the faradaic efficiency for the formation of hydrocarbons such as CH4 and C2H4. On the other hand, the potential modulation method caused the change of the surface structure of copper, i.e. the formation of cuprous oxide (Cu2O). This structural change prevented the adsorption of amorphous graphite and the constant production rate of methane was obtained in long-term electrolysis. (C) 2001 Elsevier Science Ltd. All rights reserved.