Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
Metal-free catalysts hold significant promise for catalyzing the electrochemical reduction of CO2 (CO2RR), facilitating the conversion of the greenhouse gas CO2 into valuable products. However, improvements in their catalytic activity and selectivity are still needed for widespread application.
Ionic liquids (ILs) exhibit intrinsic properties, such as high CO2 solubility, excellent ionic conductivity, stable electrochemical windows, water affinity, and structural flexibility, which make them highly attractive for both CO2 capture and as additives in electrocatalysts and electrolytes [1],[2]. To optimize the performance of electrocatalysts for CO2RR, it is essential to rationally design and enhance the micro-/nano-interface structures between porous carbon, CO2, and ILs [3], thereby selectively accelerating the production of value-added products, such as CO and hydrocarbons.
In this study, we investigate electrochemical catalysis for CO2 conversion into valuable raw materials via IL-modified porous carbon, aiming to improve the performance of carbon materials in CO2 capture and subsequent in-situ reduction. Imidazolium-based ILs with varying hydrophobicities (1-Ethyl-3-methylimidazolium acetate and 1-Butyl-3-methylimidazolium hexafluorophosphate) are employed as modifiers for the cathode material. Our results demonstrate that IL incorporation significantly enhances performance in a flow cell. Additionally, the selective production of hydrocarbons is strongly influenced by IL loading, which induces nanostructural variations of ILs modified carbons. The microenvironment of the reaction can be successfully tailored by adjusting the type of IL. This study highlights the catalytic potential of IL-modified porous carbons for CO2RR, offering a promising strategy to control product selectivity toward CO and hydrocarbons.
Y.C. and M.O. acknowledge the financial support by the Research Unit DeKarbon – Selective Deposition and Chemical Conversion of Carbon Dioxide on Nanostructured Polymer Materials (FTI Thüringen PERSONEN, 2022 FGR 0001), supported by the Free State of Thuringia and the European Social Fund Plus.
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