Publication date: 6th November 2020
Saturated CO2 solutions are widely used for CO2 electrochemical conversion to various valuable products. However, storage and manipulation of gaseous CO2 becomes cumbersome and costly. Direct liquid phase CO2 (in the form of concentrated bicarbonate solution) electrocatalytic reduction offers an option to optimize CO2 reduction processes. Using concentrated bicarbonate solutions as large carbon feedstock and bicarbonate as direct electrochemical substrate remains a challenge in the electrochemical CO2 reduction due to the low efficiency currently obtained as a consequence of the strong competition with the hydrogen evolution reaction. In this study, functional cationic surfactants are used to inhibit the hydrogen evolution reaction thus making bicarbonate electrocatalytic reduction an efficient system in the theme of electrochemical CO2 reduction. By using a metallic Sn electrode, high Faradaic Efficiency towards formate (>70%) is achieved, surpassing the results obtained in analogous experiments where a CO2 fed electrolyte was used.
O.G.S. is supported by a PhD grant from VITO’s strategic research funds (project no. 1810257). The authors acknowledge sponsoring from the research foundation of Flanders (FWO) in the frame of a post-doctoral grant (12Y3919N – ND). This research was also supported by the project CAPTIN (under the Moonshot initiative of VLAIO/Catalisti, Grant number HBC.2019.0076).
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