Effect of temperature and pressure on electrochemical CO2 reduction: A mini review

Recent Progress in Electrochemical CO2 Reduction at Different Electrocatalyst Materials

“…A According to Ishiki et al [26], nickel favors the formation of molecular H 2 via the hydrogen evolution reaction through the water reduction process (a reaction parallel to the CO 2 reduction reaction). The HER depends on the pH of the medium [26,101].…”

Operando Diagnosis of MEA-Type CO2 Electrolyzer via Distribution of Relaxation Times Analysis

“…Without using the hydrophobic ionomer in the cathodic catalyst layer, the blank Ag GDE became more hydrophilic, therefore significantly impeding the CO 2 mass transport, as reflected by the marked increase in the P 1 resistance (Figure e). Additionally, increasing the operating temperature shifted the P 1 peak toward higher frequencies and caused a moderate growth in peak intensity (Figure b), likely due to the combined effects of an increased CO 2 mass transport coefficient and reduced CO 2 water solubility at elevated temperature. , A higher temperature also promoted the water diffusion from the anodic to the cathodic side, augmenting the cathodic water content and dampening the CO 2 mass transport.…”

“…Additionally, increasing the operating temperature shifted the P 1 peak toward higher frequencies and caused a moderate growth in peak intensity (Figure 3b), likely due to the combined effects of an increased CO 2 mass transport coefficient and reduced CO 2 water solubility at elevated temperature. 39,40 A higher temperature also promoted the water diffusion from the anodic to the cathodic side, 41 augmenting the cathodic water content and dampening the CO 2 mass transport.…”

Scaling the Electrochemical Conversion of CO2 to CO

“…Carbon capture, utilization, and storage (CCUS) is considered to be a key area of research for global decarbonization and has the potential to transfer the captured carbon to other valuable products. − One of the promising CO 2 utilization technologies is the electrochemical CO 2 reduction reaction (CO 2 RR), as this uses CO 2 and renewable electricity to produce valuable building blocks for the chemicals and fuels industry. , To date, electrochemical CO 2 to CO conversion has been a promising process due to the low overpotential, high product selectivity, stability, high current density, and ease of separation of gas products from the electrolyte. , For instance, membrane electrode assemblies (MEAs) incorporated into zero-gap CO 2 electrolyzers have been demonstrated for the stable and efficient conversion of CO 2 into CO at industrially relevant current densities (i.e., >200 mA cm –2 ). − Currently efforts on catalyst design, process optimization, and scaling have outlined the electrochemical CO 2 RR as a potential competitor over conventional technologies for syngas production. − Recently, by tailoring the structure of Ag nanoparticles, a nanoporous silver (np-Ag) catalyst was developed to efficiently reduce CO 2 electrochemically into CO with approximately 92% selectivity under a moderate overpotential of 0.5 V . Besides, CO 2 crossover has been the common challenge for anion exchange membrane systems, which limits the CO 2 conversion to a maximum of 50%.…”