Ion Bridging by Carbon Dioxide Facilitates Electrochemical Energy Storage at Charged Carbon–Ionic–Liquid Interfaces
نویسندگان
چکیده
Solvent free ionic liquid (IL) electrolytes facilitate high-voltage supercapacitors with enhanced energy density, but their complex ion arrangement and through that the electrochemical properties, are limited by strong Coulombic ordering in bulk state like-charged repulsion at electrified interfaces. Herein, a unique interfacial phenomenon resulting from presence of carbon dioxide loaded 1-Ethyl-3-methylimidazoliumtetrafluorborate electrolyte simultaneously couples to IL ions nitrogen-doped carbonaceous electrode is reported. The adsorbed CO2 molecule polarizes mitigates electrostatic among near interface, leading an “bridge effect” increased density significantly charge storage capability. unpolarized possessing large quadrupole moment further reduces coupling, higher conductivity improved rate capability supercapacitor. This work demonstrates polarization-controlled like-charge attraction IL–electrode–gas three-phase boundaries, providing insights into manipulating small polar mediators.
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ژورنال
عنوان ژورنال: Advanced Energy Materials
سال: 2023
ISSN: ['1614-6832', '1614-6840']
DOI: https://doi.org/10.1002/aenm.202300401