Abstract：This study aims to elucidate the relationship between the electrochemical characteristics of redox-active carriers and the energy consumption for carbon capture in electrochemically mediated carbon capture systems. Six types of active carriers and their derivatives were selected, and their electrochemical behavior as well as CO2 response characteristics were systematically investigated using cyclic voltammetry. The CO2 binding constants and the minimum theoretical carbon capture energy consumption were quantitatively calculated. The results showed a positive linear correlation between the CO2 binding strength and the carbon capture energy consumption (R2＞0.99). Although molecular modification could tune the electrochemical properties of the carriers, the relationship between CO2 binding strength and energy consumption needed to be weighed. Electron-donating groups enhance binding strength but increased energy consumption, making them suitable for low CO2 partial pressure conditions, whereas electron-withdrawing groups reduced both binding strength and energy consumption, favoring high partial pressure or energy-sensitive conditions. The size of the conjugated system modulates the sensitivity of property changes. This study establishes a linear relationship between the electrochemical characteristics of carriers and the theoretical energy consumption for carbon capture, providing thermodynamic guidance for molecular design.
. Study on the Relationship Between Electrochemical Characteristics of Redox-Active Carriers and Energy Consumption in Carbon Capture[J]. Chemical Reaction Engineering and Technology, 2026, 42(4): 305-312.
