Effect of key parameters on regeneration performance of electrochemically mediated MEA / DEA mixed amine solutions with TBAC additive

Abstract The previous work has demonstrated that tetrabutylammonium chloride (TBAC) has an obvious enhancement effect on electrochemically mediated regeneration of MEA monoamine solution. Building upon this finding, this study expands the TBAC‐assisted strategy from a monoamine system to an MEA/DEA mixed‐amine system, systematically investigating the influence of key parameters on the regeneration performance of electrochemically mediated MEA/DEA mixed amine solutions with TBAC additive. By optimizing the amine type, MEA/DEA ratio, and Cu 2+ concentration, an efficient TBAC/MEA/DEA ternary system is constructed. The results show that under optimal conditions with an MEA/DEA mass ratio of 1:2 and a Cu 2+ concentration of 0.10 mol·mol −1 amine, the system achieves a desorption energy consumption as low as 14.55 kJ·mol −1 CO 2 , which is 16.9% lower than that of the TBAC‐free MEA/DEA system. Characterization analysis confirms that CO 2 is released through the decomposition of carbamate, and the introduction of DEA alters the electrode reaction behavior, thereby facilitating the redox process. The result is the formation of columnar crystals on the cathode and a flower‐like structure on the anode. This study provides a practical pathway for low‐carbon capture in industrial sectors.