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Lannelongue, P., Le Vot, S., Fontaine, O., Brousse, T. & Favier, F. (2019) Electrochemical study of asymmetric aqueous supercapacitors based on high density oxides: C/Ba0.5Sr0.5Co0.8Fe0.2O3-delta and FeWO4/Ba0.5Sr0.5Co0.8Fe0.2O3-delta. Electrochim. Acta, 326 UNSP 134886.
Added by: Richard Baschera (2019-12-20 09:42:21) Last edited by: Richard Baschera (2019-12-20 09:44:06) |
| Type de référence: Article DOI: 10.1016/j.electacta.2019.134886 Numéro d'identification (ISBN etc.): 0013-4686 Clé BibTeX: Lannelongue2019 Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: Aqueous electrochemical capacitors, Asymmetric devices, behavior, bscf, capacitors, charge-storage, features, FeWO4, FeWO4, hydrous ruthenium oxide, mechanism, performance, Perovskite, pseudocapacitive electrode material, supercapacitors, volumetric energy density, volumetric energy density Créateurs: Brousse, Favier, Fontaine, Lannelongue, Le Vot Collection: Electrochim. Acta |
Consultations : 8/564
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| Résumé |
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Two asymmetric aqueous electrochemical capacitors operated in 5 M LiNO3 are reported: C/Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) and FeWO4/BSCF, with activated carbon and FeWO4 (synthesized by a precipitation method) as negative electrodes, respectively, and BSCF (synthesized by a modified glycine-nitrate process) as positive electrodes. These two devices were operated between 0 and 1.6 V and between 0 and 1.4 V, respectively. They demonstrated a remarkable cycling ability with a high capacitance retention over 10,000 and 45,000 cycles, respectively. Thanks to the high density of BSCF, the C/BSCF device exhibits a volumetric energy density up to 2.7 Wh L-1 at low current densities. This study demonstrates the advantages and limits of the use of high density multicationic oxides with pseudocapacitive behavior to improve the volumetric energy density of aqueous electrochemical capacitors. (C) 2019 Published by Elsevier Ltd.
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