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Avireddy, H., Byles, B. W., Pinto, D., Delgado Galindo, J. M., Jacas Biendicho, J., Wan, X., Flox, C., Crosnier, O., Brousse, T., Pomerantseva, E., Morante, J. R. & Gogotsi, Y. (2019) Stable high-voltage aqueous pseudocapacitive energy storage device with slow self-discharge. Nano Energy, 64 UNSP 103961.
Added by: Richard Baschera (2019-10-18 11:18:55) Last edited by: Richard Baschera (2019-10-18 11:20:01) |
| Type de référence: Article DOI: 10.1016/j.nanoen.2019.103961 Clé BibTeX: Avireddy2019 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, ST2E Créateurs: Avireddy, Brousse, Byles, Crosnier, Delgado Galindo, Flox, Gogotsi, Jacas Biendicho, Morante, Pinto, Pomerantseva, Wan Collection: Nano Energy |
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Indice de consultation : 5% Indice de popularité : 1.25% |
| Résumé |
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We demonstrate an asymmetric supercapacitor in a potassium acetate-based water-in-salt electrolyte, where 2-D titanium carbide MXene and manganese oxide were used as negative and positive electrode materials, respectively. Use of water-in-salt electrolyte enables the assembled asymmetric device to be operated up to a cell voltage of 2.2 V, which overcomes the limited cell voltage issue in aqueous pseudocapacitors (1.2 - 1.4 V). This cell shows excellent rate capability (similar to 48%) between 5 and 100 mV s(-1) and good stability (similar to 93%) throughout 10,000 charge-discharge cycles (at 1 A g(-1)) and 25 h voltage-hold at 2.2 V, which is competitive when compared with the performance of known asymmetric supercapacitors designed with activated carbon electrodes and fluorinated-imide based water-in-salt electrolytes. Moreover, our device shows slower self-discharge and similar to 32% higher volumetric energy density than activated carbon-based supercapacitors and is promising for applications where volumetric energy density is critical.
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