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Guillemin, T., Douard, C., Impellizzeri, A., Ewels, C. P., Humbert, B., Lethien, C., Donne, S. W., Le Bideau, J. & Brousse, T. (2023) In-Depth Investigation of Manganese Dioxide as Pseudocapacitive Electrode in Lithium- and Sodium-Doped Ionic Liquids. J. Electrochem. Soc. 170 100531.
Added by: Richard Baschera (2023-11-22 13:43:55) Last edited by: Richard Baschera (2024-03-21 16:47:54) |
| Type de référence: Article DOI: 10.1149/1945-7111/ad0180 Numéro d'identification (ISBN etc.): 1945-7111 Clé BibTeX: Guillemin2023 Voir tous les détails bibliographiques  |
Catégories: IMN, INTERNATIONAL, PMN, ST2E Créateurs: Brousse, Donne, Douard, Ewels, Guillemin, Humbert, Impellizzeri, Le Bideau, Lethien Collection: J. Electrochem. Soc. |
Consultations : 1/58
Indice de consultation : 7% Indice de popularité : 1.75% |
| Liens URLs https://dx.doi.org ... 9/1945-7111/ad0180 |
| Résumé |
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We investigate the contribution of pseudocapacitance to the overall capacitance of MnO2 electrodes in pure and alkaline-doped ionic liquids via two spectroscopic methods: step potential electrochemical spectroscopy (SPECS) and in situ Raman spectroscopy. For both characterization methods, thin-film electrodes of birnessite-like amorphous MnO2 were cycled in Ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, pure or doped with lithium or sodium. SPECS allows determination of the influence of the electrolyte composition on the electrochemical behavior of the MnO2 electrodes. Pseudocapacitive charge storage can account for over half of the total capacitance with alkaline-doped ionic liquids. In situ Raman spectroscopy provided insight into the reversible ion intercalation in the MnO2 structure, which appears to be controlled by EMIm+ cations. These findings are supported by density functional theory (DFT) calculations, which further help unveil the charge storage mechanism in birnessite-like amorphous MnO2 thin films operated in pure and alkaline-doped ionic liquids.
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Publisher: IOP Publishing
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