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Long Nanowire Arrays Grown on Graphite as Pseudocapacitor Electrodes, ACS Applied Materials & Interfaces, vol.3, issue.1, pp.99-103, 2011. ,
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Chemical synthesis of cobalt oxide thin film electrode for supercapacitor application, Synthetic Metals, vol.160, issue.11-12, pp.1299-1302, 2010. ,
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Preparation of cobalt oxide thin films and its use in supercapacitor application, Applied Surface Science, vol.254, issue.17, pp.5540-5544, 2008. ,
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Cobalt Hydroxide as a Capacitor Material: Tuning Its Potential Window, Journal of The Electrochemical Society, vol.155, issue.11, pp.855-861, 2008. ,
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énergie, ont été établis pour les différentes cellules étudiées La puissance moyenne P moyenne et l'énergie moyenne E moyenne ont été déterminées à partir de cyclages galvanostatiques réalisés entre 0,5 et 1,6 V, à des courants compris entre 0,2 et 5 A/g. La méthode est la suivante. P moyenne est défini par la relation (V-6), avec ?V = (V max +V min, max et V min respectivement les tensions de fin de charge et de fin de décharge (V), I le courant appliqué (A), et m la masse totale de matériau actif dans la cellule (kg) : (V-6) ,
Les données relatives à une cellule symétrique AC/AC, et enregistrées dans les mêmes conditions, sont également reportées On constate tout d'abord que globalement les densités d'énergie des supercondensateurs AC/SP-initial sont supérieures à celles de la cellule AC/AC. A bas régime, les valeurs des quatre supercondensateurs hybrides sont proches (autour de 20 Wh/kg pour une densité de puissance de 209 W/kg) ? comme l'étaient leur capacité ? et deux fois plus élevées que celles de la cellule symétrique ,
Ragone montrent enfin que les énergies les plus élevées sont obtenues avec le supercondensateur AC/SP-initial préparé avec R = 1,25 ,
Assemblage d'un supercondensateur hybride carbone activé ,
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Optimisation of an asymmetric manganese oxide/activated carbon capacitor working at 2V in aqueous medium, Journal of Power Sources, vol.153, issue.1, pp.183-190, 2006. ,
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A new cheap asymmetric aqueous supercapacitor: Activated carbon//NaMnO2, Journal of Power Sources, vol.194, issue.2, pp.1222-1225, 2009. ,
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Co[sub 0.56]Ni[sub 0.44] Oxide Nanoflake Materials and Activated Carbon for Asymmetric Supercapacitor, Journal of The Electrochemical Society, vol.157, issue.12, pp.1341-1346, 2010. ,
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Les spectres ont été enregistrés entre 115 et 4000 cm -1 en utilisant une longueur d'onde incidente de 752 nm et une puissance de 10 ?W afin d'éviter toute dégradation du matériau Aucune préparation particulière de l'échantillon n'a été nécessaire Afin de suivre l'évolution ex situ du matériau SP-initial en fonction de la température, les spectres ont été normalisés par rapport à l'intensité intégrée de la bande vers 694 cm -1 . Cette dernière peut être supposée constante dans les matériaux chauffés si l'on admet qu'elle ne dépend que de la quantité de cobalt. Il faut noter cependant que d'autres facteurs peuvent influer ,
les spectres ont été normalisés (ici par rapport à l'intensité de la bande à 568 cm -1 dans ce cas) et ajustés avec des fonctions peudo-Voigt, Annexes, vol.204 ,
Les spectres ont été enregistrés au moyen d'une sonde MAS (rotation à l'angle magique) standard Bruker 2,5 mm en rotation à 25 kHz. Des séquences de pulse d'écho de Hahn synchronisées avec le rotor ont été utilisées (temps de refocalisation : 40 ?s, i.e. 1 période du rotor), avec des pulses à 90° de 1 ?s pour la RMN du 1 H à 100 Mhz et 1,3 ?s pour la RMN du 7 Li à 39,93 Mhz. 2048 scans (séquences de pulses) ont été accumulées pour le proton et entre 6400 et 9600 pour le lithium ; un temps de recyclage d'1 s séparait chaque séquence de pulses, Les spectres obtenus ont été référencés par rapport au TMS (0 ppm) pour le proton et à une solution aqueuse de LiCl 1M ,
Texture des matériaux E.1. Conditions expérimentales Les mesures de surface spécifique ont été réalisées sur un appareil Quantachrome Instruments Autosorb-1. Pour chaque échantillon, environ 30 mg de matériau est dégazé à 150 °C pendant 15 h sous helium, puis une isotherme d'adsorption, p.99 ,
SP-initial (synthétisé suivant le même protocole que SP ternaire,x9OH ), caractérisé par une densité de 6,071 g/cm 3 (déterminée plus haut) et une surface spécifique de 200 m 2 /g ,
tels que les spinelles au cobalt étudiés dans ce travail de thèse, les particules sont constituées d'un nombre limité de couches d'atomes, si bien que la proportion d'atomes en surface n'est plus du tout négligeable. Nous nous proposons ainsi d ,
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