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Electrochemical study of tetraalkylammonium tetrafluoroborate electrolytes in combination with microporous and mesoporous carbon monoliths

AutorMoreno-Fernandez, G.; Perez-Ferreras, S.; Pascual, L.; Llorente, Irene; Ibáñez, Joaquín; Rojo, J. M.
Palabras claveTetraethylammoniun tetrafluoroborate
Supercapacitor
Mesoporous carbon monolith
Microporous carbon monolith
Tetrabuthylammonium tetrafluoroborate
Tetrapropylammonium tetrafluoroborate
Fecha de publicación2018
EditorElsevier
CitaciónElectrochimica Acta 268: 121-130 (2018)
ResumenThree electrolytes with the same anion BF but different cation, EtN, PrN and BuN, are studied in combination with two binder-free carbon monoliths, one microporous and another mesoporous. The stability and working voltage window are measured. The former window broadens according to the trend BuNBF > PrNBF > EtNBF for the two monoliths. The latter window coincides with the stability voltage window for the mesoporous monolith but the trend is reversed to EtNBF> PrNBF> BuNBF for the microporous monolith. The specific capacitances associated with the cations and anions are separately measured. The specific capacitances follow the trend BF > EtN> PrN >BuN and are higher for the microporous monolith. From comparison of the ratios of the specific capacitances with those of the surface areas due to pores with sizes larger than certain values, the minimum size of the pores able to host the electro-adsorbed ions at the double layer is deduced; it results to be 0.56–0.58 nm for BF , 0.63–0.65 nm for EtN, 0.75–0.76 nm for PrN and 0.9–1 nm for BuN. The surface areas that are accessible and inaccessible to the four ions are estimated for the two monoliths. The better electrolyte/monolith combinations are discussed from a practical point of view.
Versión del editorhttps://doi.org/10.1016/j.electacta.2018.02.089
URIhttp://hdl.handle.net/10261/172503
Identificadoresdoi: 10.1016/j.electacta.2018.02.089
issn: 0013-4686
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