| 초록 |
Due to the global agenda to achieve net zero carbon emission, the needs to develop carbon capture and utilization technology has been sharply emerging. Although electrochemical CO2 reduction (CO2R) to useful carbon chemicals is challenging to meet the industrial requirements, recent studies have made a significant improvement in the performances. Gas-diffusion electrode configurations allow direct CO2 gas-feeding to the catalyst layer and several hundred mA/cm2 of current density have been demonstrated with a zero-gap type of membrane electrolyzer assembly (MEA) electrolyzer. However, many underlying phenomena are still not clearly understood. Among various components of MEA, here, I will focus on the cathode catalyst and balanced CO2 and water supply at the three-phase boundary. For the catalyst design to have selective CO2R, weak HER activity is important especially with the low concentration (~ 10%) of CO2, due to the slower CO2 reduction rate compared to 100 % of CO2 gas feeding. In addition, we confirmed the importance of the water supply from the anolyte for the efficient CO2R MEA electrolyzer. |
