Effect of Cations on the Electrochemical Conversion of CO2 to CO

被引:293
作者
Thorson, Michael R. [1 ]
Siil, Karl I. [1 ,2 ]
Kenis, Paul J. A. [1 ,2 ,3 ]
机构
[1] Univ Illinois, Dept Chem & Biomol Engn, Urbana, IL USA
[2] Univ Illinois, Ctr Nanoscale Chem Elect Mech Mfg Syst, Urbana, IL 61801 USA
[3] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka 812, Japan
关键词
CARBON-DIOXIDE; METAL-ELECTRODES; CU ELECTRODE; FORMIC-ACID; REDUCTION; METHANOL; ETHYLENE; ELECTROREDUCTION; TECHNOLOGIES; TEMPERATURE;
D O I
10.1149/2.052301jes
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
We investigate the influence of electrolyte composition on the electrochemical reduction of CO2 to CO in an electrochemical flow reactor. Specifically, we study the effect of alkali cations on the partial current densities of the two products: CO and H-2. We report that the presence of large cations such as cesium and rubidium in the electrolyte improves the partial current density for CO production. Furthermore, large cations suppress H-2 evolution, resulting in high faradaic yields for CO production. For example, with a large cation, specifically CsOH, a partial current density of 72 mA/cm(2) was obtained at a cathode potential of -1.62 V vs Ag/AgCl. In contrast, in the presence of a small cation, specifically sodium, a partial current density of only 49 mA/cm(2) was achieved at a much more negative cathode potential of -2.37 V vs Ag/AgCl, with NaBr. The effect of cation size on product selectivity for CO production can be explained by the interplay between the level of cation hydration and the extent of cation adsorption on Ag electrodes. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.052301jes] All rights reserved.
引用
收藏
页码:F69 / F74
页数:6
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