| 초록 |
The electrocatalytic CO2 conversion technology is attracting huge attention since it converts greenhouse gas, CO2, into useful chemicals by utilizing renewable electricity sources. Proton conducting electrolysis cell, PCEC, is a new type of solid oxide electrolysis cell. Due to the low activation energy for proton conduction, the operating temperature of PCEC can be lowered to 500℃~650℃. This temperature range has not been thoroughly investigated for electrochemical CO2 conversion.In this study, yttrium, ytterbium, and cerium-doped barium zirconate (BCZYYb) was used as electrolyte. The stability of the electrolyte against CO2 according to the Ce to Zr ratio was confirmed and lower Ce to Zr ratio led to higher stability. PCEC was successfully fabricated and tested for electrochemical CO2 reduction. Electrochemical analyses were performed at various CO2 compositions and products were analyzed by gas chromatography. Higher CO2 concentrations in the feed gas led to higher current densities. This result showed one of the highest current density of 2.3Acm−2 at 1.2V and 650℃. |
