biostudies-literatureGarcia-Gimenez DMinisterio de Ciencia e Innovacióne202501259https://www.ebi.ac.uk/biostudies/studies/S-EPMC12642970biostudies-literatureUnknown18(22)Aqueous electrolytes offer a safer, more cost-effective, and scalable solution for electrochemical CO₂ capture. Herein, electrolytes that combine harmless polyethylene glycol with slightly salty water are developed, which enables the capture of CO₂ in a supercapacitor cell of up to 79 mmol of CO₂ per kilogram of electrode material while operating at a current density of 30 mA g^-1, a voltage of 2.5 V, at 40 °C, and under neutral pH conditions. Interestingly, applying negative charge protocols up to -2.5 V increases the amount of CO₂ adsorbed per kilogram of electrode to 356 mmol. This is attributed to both the ejection of preadsorbed bicarbonate species from the pores and their slow migration kinetics near the electrode exposed to CO<suChemSusChemSupercapacitive CO&lt;sub&gt;2&lt;/sub&gt; Capture through a Scalable, Aqueous, Neutral Polymer-Based Electrolyte.PMC12642970PRE2021-099783PRE2021‐099783PID2020‐119658RB‐I00PID2020-119658RB-I00Santos-Rodriguez MGarcia-Gimenez DSanan-Ali MMaria-Anna ACarretero-Gonzalez JLopez-Manchado MAfalseSupercapacitive CO&lt;sub&gt;2&lt;/sub&gt; Capture through a Scalable, Aqueous, Neutral Polymer-Based Electrolyte.Aqueous electrolytes offer a safer, more cost-effective, and scalable solution for electrochemical CO₂ capture. Herein, electrolytes that combine harmless polyethylene glycol with slightly salty water are developed, which enables the capture of CO₂ in a supercapacitor cell of up to 79 mmol of CO₂ per kilogram of electrode material while operating at a current density of 30 mA g^-1, a voltage of 2.5 V, at 40 °C, and under neutral pH conditions. Interestingly, applying negative charge protocols up to -2.5 V increases the amount of CO₂ adsorbed per kilogram of electrode to 356 mmol. This is attributed to both the ejection of preadsorbed bicarbonate species from the pores and their slow migration kinetics near the electrode exposed to CO<su2025-01-01T00:00:00Z2025 Nov2026-06-06T06:50:26.322Z2026-06-06T03:06:44.657ZS-EPMC126429704098271510.1002/cssc.202501259