Electrochemical CO2 reduction to CO facilitated by MDEA-based deep eutectic solvent in aqueous solution

Electrochemical reduction of CO2 in the captured state using aqueous or nonaqueous amines

“…Consequently, molecular design of amines or other next-generation sorbents that function optimally in an integrated capture-conversion context are of great interest. For example, amine-functionalized ionic liquids or deep-eutectic solvents are interesting potential candidates given their high degree of chemical and structural tunability ( Ahmad et al., 2021 ; Shukla et al., 2019 ; Voskian et al., 2020 ).…”

Advancing integrated CO2 electrochemical conversion with amine-based CO2 capture: a review

“…Such an electrode can achieve 50 mA cm −2 with a CO faradaic efficiency of about 72% at −0.8 V vs. reversible hydrogen electrode (RHE). In another recent report, Ahmad et al 73 boosted the CO faradaic efficiency of CO up to ∼91% in 0.25–1 M CO 2 -saturated AMP aqueous solution with 0.3 mM CTAB by treating Ag foils with HCl. More recently, Kim et al 75 showed that applying nickel (Ni) single-atom catalyst as shown in Fig.…”

Energy comparison of sequential and integrated CO2 capture and electrochemical conversion

“…Lastly, we assessed the energy consumption of the sequential route based on future CO 2 gas-fed electrolysis with 100% CO 2 utilization efficiency, meaning that no CO 2 gas will be lost into (bi)carbonate during gas-fed conversion. Very recent reports demonstrated the potential to improve CO 2 utilisation efficiency 53 by developing catalystmembrane interface 44,54 , optimising cell operating conditions (e.g., reducing CO 2 flow rates, increasing current densities, and optimising anolyte compositions and ionic strength) 46 , or supplying protons towards the cathode to regenerate CO 2 from the (bi)carbonates, e.g., flowing strong acidic catholyte 22,55 , applying cation-exchange membranes 44 or bipolar membrane 54 in a reverse mode. The singlepass conversion rate remains 50% in this optimistic sequential model, meaning that 50% of the inputted CO 2 feed converts to CO product and reduces the required pressure-swing absorption separation energy consumption.…”

“…Despite a number of reports on integrated electrolysis, their current performance is inferior to the gas-fed electrolysis system owing in part to their earlier development 22,[43][44][45][46][47] (see Fig. 2) Regardless as the process can be evaluated as a function of performance metrics it is possible to forecast required performance targets at this early stage.…”