Integration of aprotic CO₂ reduction to oxalate at a Pb catalyst into a GDE flow cell configuration

Abstract

The electrochemical CO2 reduction to oxalic acid in aprotic solvents could be a potential pathway to produce carbon-neutral oxalic acid. One of the challenges in the aprotic CO2 reduction are...

CO2 Electroreduction in Organic Aprotic Solvents: A Mini Review

“…e donor-acceptor interaction L: ⟶CO 2 causes inhibition of electron transfer, which affects the ratio of oxalate and CO as products of cathodic reduction of CO 2 ; namely, with a decreasing electron-donor capability, increased oxalate formation is observed [27]. erefore, AN, which has the lowest DN value, is often used as a medium for oxalate obtaining with a high value of Faradaic efficiency-∼80% [33], ∼62% [51], ∼74% [52], and ∼97% [53]. However, this dependence [oxalate]: [CO] on DN of aprotic solvent should be considered as a trend because the course of electrochemical reactions ( 13) and ( 15) and, accordingly, the value of FE are influenced by the values of cathode potential, cathode nature, and temperature.…”

“…Depending on the nature of the cathode surface in organic aprotic solvents, the reduction of CO 2 with the formation of oxalate or CO is possible. us, according to scheme (Figure 5(a)) on copper [31], gold [32,49], and gallium electrodes [50], CO is formed, according to scheme (Figure 5(b)) on stainless steel [51,52] and lead [33,53] electrodes-oxalate with high values of Faradaic efficiency (Table 1). On the electrode based on MoO 2 [31], the parallel reduction is possible according to schemes (a) and (b) with the formation of two products.…”

“…In addition, CO 2 has a high solubility in organic solutions. Among them, the most studied are ionic liquids [19][20][21][22][23][24][25][26], methanol solutions [27][28][29], and organic aprotic solvents [30][31][32][33][34][35][36][37][38][39][40]. In recent years, there has also been engagement in the CO 2 electrochemical reduction process in molten salts [41][42][43][44][45][46].…”

A State‐of‐the‐Art Update on Integrated CO2 Capture and Electrochemical Conversion Systems

“…Carbon Capture and Utilization (CCU) technologies have been postulated as one of the most promising strategies to relieve the increase in the concentration of CO 2 present in the atmosphere and introduce sustainable carbon cycles by using CO 2 directly from the air or flue gasses as a substrate in the chemical industry [1–6] . In this way, the CO 2 , which is mostly released from energy production or industrial processes, can be converted back to fuels (like syngas or alcohols) [7,8] or chemical synthesis precursors (such as formic acid, carbon monoxide or oxalic acid) [9–12] . However, capturing, storing and releasing the CO 2 to the chemical reactor is expensive and logistically cumbersome [13,14] .…”

“…[1][2][3][4][5][6] In this way, the CO 2 , which is mostly released from energy production or industrial processes, can be converted back to fuels (like syngas or alcohols) [7,8] or chemical synthesis precursors (such as formic acid, carbon monoxide or oxalic acid). [9][10][11][12] However, capturing, storing and releasing the CO 2 to the chemical reactor is expensive and logistically cumbersome. [13,14] Therefore, integrating the capture and the conversion steps is crucial to decrease the costs and make the process efficient, and thus industrially attractive.…”