Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.112
Publication date: 16th December 2024
The electrochemical CO2 reduction reaction (CO2RR) has garnered significant attention over the past decade due to its distinct advantages, including operation under ambient conditions, compatibility with renewable electricity, and the ability to produce a diverse array of value-added products. Most CO2RR research to date has utilized pure CO2 as the feedstock. However, real-world CO2 waste streams, such as those in flue gas or biogas, typically contain no more than 40% CO2. This discrepancy poses challenges for the economic feasibility and sustainability of CO2RR, as CO2 purification steps prior to electrolysis—such as CO2/N2 separation—can cost $70–100 per ton of CO2 and significantly increase the carbon footprint [1].
In recent years, integrating CO2 capture with electroreduction into a single unit has emerged as a promising strategy to address these limitations. Many studies have focused on using CO2 capture solutions as electrolytes, achieving encouraging results in improving the overall cost-efficiency of CO2RR. Beyond solution- or electrolyte-based capture methods (e.g., amine solutions and ionic liquids), integrating alternative approaches such as solid adsorption and membrane-based processes into CO2RR systems offers considerable potential. For instance, combining these methods with gas-diffusion electrode designs could enhance the efficiency and practicality of CO2 capture-electroreduction systems [2,3].
Herein, we showcase the scenarios to integrate adsorption and membrane separation within gas-diffusion electrodes (GDEs) and present our recent research data of CO2 conversion by an ionic liquid-mediated CO2-selective GDE. GDEs have been tested with gaseous feed with CO2 concentration as low as 15% containing O2, resembling flue gas, and showed high-rate syngas production with a polymer-ionic liquid selective layer.
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