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• W1874505208 abstract "Supercapacitors store charge through the electrosorption of ions on microporous electrodes. Despite major efforts to understand this phenomenon, a molecular-level picture of the electrical double layer in working devices is still lacking as few techniques can selectively observe the ionic species at the electrode/electrolyte interface. Here, we use in situ NMR to directly quantify the populations of anionic and cationic species within a working microporous carbon supercapacitor electrode. Our results show that charge storage mechanisms are different for positively and negatively polarized electrodes for the electrolyte tetraethylphosphonium tetrafluoroborate in acetonitrile; for positive polarization charging proceeds by exchange of the cations for anions, whereas for negative polarization, cation adsorption dominates. In situ electrochemical quartz crystal microbalance measurements support the NMR results and indicate that adsorbed ions are only partially solvated. These results provide new molecular-level insight, with the methodology offering exciting possibilities for the study of pore/ion size, desolvation and other effects on charge storage in supercapacitors. Observing ionic species at the electrode/electrolyte interface in supercapacitor devices is difficult. In situ NMR is now used to directly quantify anionic and cationic species within a working microporous carbon supercapacitor electrode." @default.
• W1874505208 created "2016-06-24" @default.
• W1874505208 creator A5005354876 @default.
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• W1874505208 date "2015-06-22" @default.
• W1874505208 modified "2023-10-09" @default.
• W1874505208 title "In situ NMR and electrochemical quartz crystal microbalance techniques reveal the structure of the electrical double layer in supercapacitors" @default.
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• W1874505208 doi "https://doi.org/10.1038/nmat4318" @default.
• W1874505208 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26099110" @default.
• W1874505208 hasPublicationYear "2015" @default.
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