High-Rate Capability of Supercapacitors Based on Tannin-Derived Ordered Mesoporous Carbons
Résumé
Ordered mesoporous carbons (OMCs) are produced by an easy, fast and green surfactant-water-assisted mechanochemical mesostructuration (SWAMM) method, using only tannin, water and Pluronic® F127 as raw materials. OMCs are physically activated with CO2 to increase their surface area from ~500 m 2 g-1 to ~2000 m 2 g-1 while maintaining the mesoporosity fairly unaltered, which allow studying the effect of the micropore size distribution on the supercapacitors performances both in aqueous and organic electrolytes. Selected activated OMCs (AOMCs) reach maximum cell capacitance values of 37 and 27 F g-1 , at 0.2 A g-1 , in aqueous and organic electrolytes, respectively. High long-term stabilities over time and after continuous 2 cycling are found for the tested AOMCs in both kinds of electrolyte. High rate capabilities are achieved at high current densities with capacitance retentions up to 70% at 80 A g-1 and 44 % at 40 A g-1 in aqueous and organic electrolytes, respectively, due to a suitable pore size distribution that promotes ion diffusion into the electrodes, in particular for the material activated during 75 min.
Domaines
Matériaux
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manuscript-High-rate AOMCs_reviewed_nomarks.pdf (1.07 Mo)
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SupInf-High-rate AOMCs_final.pdf (1.1 Mo)
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