饱和甘汞电极
法拉第效率
电解质
格式化
无机化学
电极
电化学
化学
电极电位
可逆氢电极
选择性
工作电极
电化学电池
分析化学(期刊)
催化作用
色谱法
有机化学
物理化学
作者
Jingjie Wu,Frank G. Risalvato,Fu‐Sheng Ke,Perry J. Pellechia,Xiao‐Dong Zhou
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2012-01-01
卷期号:159 (7): F353-F359
被引量:194
摘要
The effects of electrolyte on selectivity and activity were investigated in the electrochemical reduction of CO2 on the Sn electrode. The production of formate, the primary product in our three-electrode cell was quantitatively characterized by solution phase 1H NMR spectroscopy. Both SO42− and Na+ favor higher faradaic and energy efficiencies, while HCO3− and K+ enable a higher rate of formate production. The faradaic efficiency was as high as ∼95% for 0.1 M Na2SO4 at a potential of −1.7 V vs. a Saturated Calomel Electrode (SCE). 0.5 M KHCO3 was an optimal electrolyte for obtaining a high production rate of formate which can reach over 3.8 μmol min−1 cm−2 at a potential of −2.0 V vs. SCE while maintaining a faradaic efficiency of ∼63%. A trend we observed was that the faradaic efficiency increases as the concentration of electrolyte is diluted. Our studies also show the degradation of electrocatalytic activity of the Sn electrode in this three-electrode cell can be attributed to the electrodeposition of trace amounts of Zn onto the surface of the Sn electrode, which reduces the active surface area.
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