Electrocatalytic conversion of CO 2 to added-value chemicals in a high-temperature proton-exchange membrane reactor

Gas-phase CO2 electroreduction over Sn–Cu hollow fibers

“…Although the proportion of acetone in all products has been increased, acetaldehyde is still the main product with a FE of ~8 %. The yield of acetaldehyde leaps to 70 nmol•cm -2 •h -1 , which is higher than those reported in literatures as shown in Table S2 [18][19][20] , indicating the promoted activities for both C 2 and C 3 products with few deposited SnO 2 nanoparticles on Cu HF electrode surface (0.1 wt.%).…”

“…Acetaldehyde is the main reduction product at all conditions, which is in agreement with previous studies of gasphase CO 2 electroreduction. [18][19][20] At the potential of -1.4 V vs CE, the total FE for all products is about 10 %, while ~25 nmol•cm -2 •h -1 acetaldehyde is formed with a FE of around 6 %. •h -1 with a catalyst loading of 0.5 mg•cm -2 ) at a higher temperature and penitential (90 o C, -2.75 V, -1.6 mA•cm -2 ), the FE of acetaldehyde is only 1 %.…”

“…Acetaldehyde could be observed as one of the main products for all electrodes with several other C 1~C3 products, while no H 2 from competitive H 2 evolution reaction could be detected in examined conditions, which is consistent with the results of former gas-phase CO 2 electroreduction studies. [16][17][18][19][20] The gasphase electrocatalytic reduction of CO 2 is a complex multistep reaction involving shared intermediates and multiple reaction pathways. 19,20 The formation of the different products can be described by a general reaction as shown in Scheme 1 for the cathodic reaction of CO 2 and H + with e -.…”

“…17 Recent studies from Gutiérrez-Guerra et al used polybenzimidazoles (PBI) and Sterion® as the solid electrolyte for gas-phase CO 2 electroreduction at 90 o C, obtaining methanol and acetaldehyde with yields of 40 and 110 µmol•g cat -1 •h -1 over Cu catalysts. [18][19][20] However, these works are all based on conventional types of Cu-based electrodes, with unsatisfying overall efficiencies and insufficient value-added multicarbon products for the electroreduction of gas-phase CO 2 .…”

CO2valorisation towards alcohols by Cu-based electrocatalysts: challenges and perspectives

“…Relative Faradaic efficiencies and total current densities of the best catholyte-free EC CO 2 R electrocatalysts towards methanol, ethanol and n-propanol production. Authors with data taken from 132,[134][135][136][137][138][139][140][141] .…”