Local pH induced electrochemical CO2 reduction on nanostructured Ag for adjustable syngas composition

A manganese complex on a gas diffusion electrode for selective CO2 to CO reduction

“…39,40 It is notable that at −0.98 V RHE the CO current density is signicantly greater for the Mnbpy GDE (13.7 ± 2.0 mA cm −2 ) than the benchmark Ag catalyst at this potential (5.8 ± 0.41 mA cm −2 ). The achieved partial current densities using the Ag GDE are relatively low when compared to those reported in alkali electrolytes 41 but they are in-line with past studies in KHCO 3 electrolytes at low applied overpotentials 42,43 and we anticipate that future optimisation of the formulation of the GDE may increase the activity of both the Mnbpy and the Ag electrodes.…”

“…39,40 It is notable that at -0.98 VRHE the CO current density is significantly greater for the Mnbpy GDE (13.7  2.0 mA cm -2 ) than the benchmark Ag catalyst at this potential (5.8  0.41 mA cm -2 ). The achieved partial current densities using the Ag GDE are relatively low when compared to those reported in alkali electrolytes 41 but they are in-line with past studies in KHCO3 electrolytes at low applied overpotentials 42,43 and we anticipate that future optimisation of the formulation of the GDE may increase the activity of both the Mnbpy and the Ag electrodes. Experiments in a flow cell using a near neutral electrolyte (KHCO3) showed that the Mnbpy GDE showed a good selectivity for CO2 reduction to CO, but that at higher current densities, which correlates to a higher local pH (figure S9) there is a decrease in jCO.…”

Electrodeposited Sn–Cu@Sn dendrites for selective electrochemical CO2 reduction to formic acid

“…25,30,31 In addition, the dendritic structure at the electrode surface is advantageous to increase the local pH near the electrode, which facilitates the CO 2 RR by suppressing the competing HER. [37][38][39] Fig. 3(b) and (c) show product distributions at various potentials with the Sn-Cu@Sn dendrites and the SnNP, respectively.…”

“…25,30,31 In addition, the dendritic structure at the electrode surface is advantageous to increase the local pH near the electrode, which facilitates the CO 2 RR by suppressing the competing HER. 37–39…”

Spectroelectrochemical Investigation of the Local Alkaline Environment on the Surface-Nanostructured Au for the Conversion of CO2 to CO

“…Recent spectroelectroscopic studies have attempted to directly observe the local pH by probing the local concentration of carbonate species which can affect the stabilization of key intermediates (e.g., *CO 2 – , *COOH, and *CO). , The increased local alkalinity, resulting from the mass-transfer limitation of OH – during the CO 2 reduction, can suppress the proton reduction reaction. ,, In particular, nanostructured, porous electrodes can accelerate the increased local alkalinity effect due to the increased surface area (i.e., active sites) as well as the mass limitation of OH – . Although computational simulations can be used to calculate the local pH of electrodes based on thickness or structural changes, there are limitations in applying them to actual electrodes with diverse nanoporous structures.…”