Integration of CO₂ Capture and Electrochemical Conversion

Abstract

Integration of CO2 capture and CO2 conversion through electrochemical processes has emerged in recent years, offering a distinct advantage over the traditional independent methods by obviating the costly capture media recovery and compression steps. This review aims to provide a comprehensive overview of this promising research area. State-of-the-art studies of strategies involving independent processes, coupling in a single electrolytic cell, and integration into two electrolytic cells for CO2 capture and conversion are discussed. Furthermore, the energy and production costs for three alternative methods are assessed and compared to highlight the benefits of integration systems. In addition, our personal perspectives on the challenges and opportunities in this emerging field, including achieving high faradic efficiency and low cell voltage, seawater exploration, and membrane-less configuration for high-durability applications, are presented.

Multi-Functional Polymer Membranes Enable Integrated CO2 Capture and Conversion in a Single, Continuous-Flow Membrane Reactor under Mild Conditions

“…This strategy was based on the hypothesis that bicarbonate ions could engage in hydrogen bonding interactions, thereby improving the overall stability of the membrane. Additionally, the use of bicarbonate ions offers environmental advantages over bromide ions, bicarbonate ions are reactive toward epoxides, and bicarbonate ions were reported as key intermediates in coupled CO 2 capture and conversion. − The ion exchange process was carried out using KHCO 3 as the exchange agent (see the Experimental Section).…”

Advances and challenges in membrane electrode assembly electrolyzers for CO2 reduction

“…Firstly, the majority of current research relies on high-purity CO 2 as a feedstock, which is expensive to produce. [105][106][107] Secondly, obtaining highly specialized materials such as PEM and GDL in sufficient quantities, at a reasonable cost, and with consistent quality has proven to be a signicant hurdle. For successful industrial operation, especially when scaling up the electrode working area to hundreds or thousands of square centimeters, it is crucial to address issues such as uneven current density due to changing CO 2 concentration gradients in the ow channel.…”

Ethylene Production from Carbonate Using a Bipolar Membrane Electrolysis System

“…The direct conversion of CO 2 capture solutions presents a potential approach to further increase carbon utilization within the CO 2 electrolyzer. − CO 2 capture system can function with many different mediums. However, chemical absorption by aqueous ammonia, amine-based solvents, and alkaline solvents such as Ca­(OH) 2 and NaOH is the most common method for CO 2 capture .…”