Effect of additives in aqueous electrolytes on CO2 electroreduction

Highly Tunable Syngas Product Ratios Enabled by Novel Nanoscale Hybrid Electrolytes Designed for Combined CO2 Capture and Electrochemical Conversion

“…[ 17 ] Unfortunately, its CO 2 solubility is limited to ≈ 34 m m , or 0.034 mmol CO 2 g −1 . [ 5,17,18 ] As a result, when developing novel electrolytes for the integrated capture and conversion of CO 2 , it will be necessary to determine the electrolyte CO 2 concentration at a wide range of CO 2 capture conditions and address any potential challenges associated with limited CO 2 solubility. In this study, we investigated the CO 2 capture kinetics and capacities of 8 wt.% PEI and 10 wt.% NOHM‐I‐PEI aqueous solutions at CO 2 partial pressures ranging from 0.04 to 1 atm.…”

“…Several advances have been made in terms of catalyst [ 5,12–14 ] and reactor [ 5,14–16 ] design for the electrochemical conversion of CO 2 , though aqueous CO 2 electroreduction is also limited due to the low solubility of CO 2 in the electrolyte phase. [ 5,17,18 ] Thus, the development of innovative electrolytes with improved CO 2 solubilities has been proposed to improve the performance of the CO 2 electroreduction reaction (CO 2 RR) and other electrochemical reactions relevant to energy storage applications, such as flow batteries. [ 17–24 ]…”

Self-Templated Conversion of a Self-Healing Metallogel into an Active Carbon Quasiaerogel: Boosting Photocatalytic CO2 Reduction by Water

“…CO 2 , a key greenhouse gas, is increasing rapidly in the atmosphere due to the burning of fossil fuels, volcanic eruptions, and manufacturing industries. − Globally, substantial research efforts have been made for the design and development of CO 2 host materials, such as carbonaceous materials, metal–organic frameworks (MOFs), metal oxides, porous polymers, zeolites, and so forth. − The CO 2 level in the atmosphere is supposed to increase in the upcoming years. − Therefore, the removal of CO 2 only by the adsorption process is not a promising and long-term solution to reduce the CO 2 concentration in the atmosphere. Nowadays, CO 2 capture and its conversion into valuable products are receiving increasing interest from the scientific community. − In this context, only a handful of literature is available for CO 2 reduction into fuels and value-added chemicals based on metal–organic gel catalysts; for example, Maji and co-workers reported zinc- and ruthenium-mediated metal–organic gel-based photocatalysts for CO 2 reduction into CO and CH 4 . , Lan and co-workers reported a copper-hydrogel-derived catalyst for CO 2 conversion into C 2 H 4 and CH 4 .…”

Enhanced Electrochemical CO2 Reduction to Formate on Poly(4-vinylpyridine)-Modified Copper and Gold Electrodes

“…80% . There are two main considerations explaining how additives affect the activity and selectivity of CO 2 RR catalysts: (i) by influencing the catalytic activity (by stabilizing/destabilizing reaction intermediates) and/or (ii) by changing the local concentration of interfacial species involved in the reaction. , To illustrate, a higher CO coverage on polyaniline coated polycrystalline Cu catalysts, an increased local pH for polycrystalline Cu electrodes modified with N-substituted pyridinium additives, and enhanced stabilization of the CO dimer on PAM modified Cu polycrystalline catalysts have been speculated to increase the selectivity toward C 2+ hydrocarbons, whereas the unfavorable H 2 O dissociation and limited mass transport of proton donors (H 2 O and HCO 3 – ) have been proposed to lead to the suppression of the hydrogen evolution reaction (HER) on alkanethiol-modified Cu mesh electrodes and cetalkonium chloride-modified polycrystalline Sn eletrodes . Furthermore, recent computational studies have demonstrated a relation between changes in hydrophobicity resulting from functionalization of a Cu surface with organic molecules and the tendency to form surface hydrides .…”