제목: Power-to-X: Electrocatalyst for Electrochemical CO2 conversion

내용: CO2 conversion to valuable products has been recently highlighted and made significant progress in terms of current density as well as product selectivity. When it comes to the electrochemical CO2 reduction reaction (CO2RR) to products such as CO, formic acid, or C2+ chemicals, multiple reaction pathways and reaction intermediates are shared and thus product distribution is sensitively affected by nanostructured active sites both in a conventional H-cell as well as a membrane electrode assembly (MEA) electrolyzer. Understanding intrinsic and extrinsic factors are important to achieve selective CO2RR to target product. In this talk, I will discuss our recent efforts to understand the morphology changes of the nanocatalyst during CO2 reduction reaction. Cu-based catalysts can experience the morphology changes during pre-treatment step and reduction reaction conditions, and increasing the domain boundaries can contribute to enhanced activity for CO2RR over HER. In the GDE based membrane-electrode-assembly (MEA) electrolyzer, increasing the surface roughness and grain boundaries have showed high selectivity for C2+ chemicals similarly to the conventional H-Cell type electrolyzer. Therefore, the morphology changes of the catalysts should not be underestimated to achieve long-term durability.