Capacitor behavior in neutral electrolytes of ordered mesoporous manganese oxide obtained from oxidation of perfluorinated alkenes by soft template CTAMnO 4
| Autor: | C.C.H. Tran, Christine Damas, Jesús Santos-Peña |
|---|---|
| Přispěvatelé: | Physico-chimie des Matériaux et des Electrolytes pour l'Energie (PCM2E), Université de Tours, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Université de Tours (UT), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Asymmetric devices
Materials science Birnessite General Chemical Engineering chemistry.chemical_element 02 engineering and technology Manganese Electrolyte [CHIM.INOR]Chemical Sciences/Inorganic chemistry 010402 general chemistry Electrochemistry 7. Clean energy 01 natural sciences Manganese oxide [CHIM]Chemical Sciences Ragone plot ComputingMilieux_MISCELLANEOUS Carbon black [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry Ordered mesoporous materials chemistry Chemical engineering Electrode Gravimetric analysis Electrochemical capacitors 0210 nano-technology Mesoporous material |
| Zdroj: | Electrochimica Acta Electrochimica Acta, Elsevier, 2018, 272, pp.108-118. ⟨10.1016/j.electacta.2018.03.187⟩ |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2018.03.187⟩ |
| Popis: | Ordered mesoporous manganese oxides were produced as a by-product of the oxidation of perfluorinated alkenes by soft template CTAMnO 4 (CTA = cetyltrimethylammonium). Pores diameter was in the 2.4–6.0 nm range and pore walls were made of birnessite nanocrystallites. Alkene dimensions influenced the oxides morphological and textural properties, including pore ordering. For a particular alkene (1H, 1H, 2H Perfluoro-1-Decene), the surface specific area (SSA) of the manganese oxide was as high as 265 m 2 g −1 . Mesoporosity, combined with large SSA, guarantee rapid diffusion and access of the electrolyte to the electrochemical capacitor electrode surfaces. Composites of mesoporous oxides, black carbon and Teflon in a 75/12.5/12.5 wt ratio provided capacitances in the 150–175 F g −1 range in neutral aqueous 1 M K 2 SO 4 electrolyte. Asymmetric AC||MnO 2 devices, cycled reversibly in a 0–1.7 V voltage window, had a pore-depending activation time during which capacitance increases upon cycling. Ragone plot for these MnO 2 -based electrodes shows suitable gravimetric energy retention with increasing power, comparable or higher than most of the literature results concerning composite electrodes (except for microsupercapacitors). For instance, energy provided by such devices, at power close to 0.2 kW kg −1 , approaches 20 Wh.kg −1 . From this point of view, our devices can compete with others containing a very high amount of low density and expensive conductive additive in the positive electrode formulation, which penalizes the volume and cost of the final device. |
| Databáze: | OpenAIRE |
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