On the Electrochemical CO2 Reduction at Copper Sheet Electrodes with Enhanced Long-Term Stability by Pulsed Electrolysis
On the Electrochemical CO2 Reduction at Copper Sheet Electrodes with Enhanced Long-Term Stability by Pulsed Electrolysis
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DOI：
10.1149/2.0091815jes
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发表时间：
2018-09-08
影响因子：
3.9
通讯作者：
Moos, Ralf
中科院分区：
文献类型：
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作者：
Engelbrecht, Andreas;Uhlig, Conrad;Moos, Ralf
我们报告的长期稳定性的电化学还原CO2在铜片电极连续施加矩形，脉冲电压周期串联。每个脉冲周期由阳极和阴极电压水平组成。系统地修改脉冲周期的参数：阴极（-1.5. 1.8 V）和阳极电压水平（-0.88.+ 0.15阳极与阴极脉冲持续时间之比（5 s：5 s）。5秒：500秒）。电解运行在分开的H-电池中进行。挥发性反应产物（CO、CH4、C2H4，在16 h的电解过程中，C_2H_4和CH_4的法拉第产氢效率分别为20 ~ 35%FE和20 ~ 50%FE，对析氢反应的抑制率分别为10%和10% FE。此外，我们显示了两个长期的电解运行的85小时和95小时的持续时间，分别的数据。即使对于这种延长的电解时间，也实现了对HER的显著的、相当恒定的抑制和形成含碳气体产物（CO、CH 4、C2 H4）的高效率。(C)作者（S）2018由ECS发布。
We report on the long-term stability of the electrochemical reduction of CO2 at copper sheet electrodes by continuously applying rectangular, pulsed voltage cycles in series. Each pulse cycle consisted of an anodic and a cathodic voltage level. The parameters of the pulse cycle were systematically modified: cathodic (-1.5...-1.8 V) and anodic voltage levels (-0.88...+0.15 V), and ratio of anodic to cathodic pulse duration (5 s: 5 s... 5 s: 500 s). The electrolysis runs were conducted in a divided H-cell. Volatile reaction products (CO, CH4, C2H4, H-2) were analyzed with a gas chromatograph in intervals of 7.3 min. We achieved fairly stable faradaic efficiencies (FE) for hydrocarbon formation in the range of 20 to 35% FE for C2H4 and 20 to 50% FE for CH4 during 16 h of electrolysis and a remarkable suppression of hydrogen evolution reaction (HER) down to 10% FE. Additionally, we show data of two long-term electrolysis runs of 85 h and 95 h duration, respectively. Even for this prolonged electrolysis times, an outstanding, fairly constant suppression of HER and a high efficiency for the formation of carbon containing gaseous products (CO, CH4, C2H4) was achieved. (C) The Author(s) 2018. Published by ECS.