Selective Charging Behavior in an Ionic Mixture Electrolyte-Supercapacitor System for Higher Energy and Power.

Autor:	Wang X; Department of Chemical Engineering, Norwegian University of Science and Technology , 7491 Trondheim, Norway.; Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University , Philadelphia, Pennsylvania 19104, United States., Mehandzhiyski AY; Department of Chemical Engineering, Norwegian University of Science and Technology , 7491 Trondheim, Norway., Arstad B; SINTEF Materials and Chemistry, Blindern , 0314 Oslo, Norway., Van Aken KL; Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University , Philadelphia, Pennsylvania 19104, United States., Mathis TS; Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University , Philadelphia, Pennsylvania 19104, United States., Gallegos A, Tian Z, Ren D; Department of Electronic Systems, Norwegian University of Science and Technology , 7491 Trondheim, Norway., Sheridan E; SINTEF Materials and Chemistry , 7491 Trondheim, Norway., Grimes BA; Department of Chemical Engineering, Norwegian University of Science and Technology , 7491 Trondheim, Norway., Jiang DE, Wu J, Gogotsi Y; Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University , Philadelphia, Pennsylvania 19104, United States., Chen; Department of Chemical Engineering, Norwegian University of Science and Technology , 7491 Trondheim, Norway.
Jazyk:	angličtina
Zdroj:	Journal of the American Chemical Society [J Am Chem Soc] 2017 Dec 27; Vol. 139 (51), pp. 18681-18687. Date of Electronic Publication: 2017 Dec 14.
DOI:	10.1021/jacs.7b10693
Abstrakt:	Ion-ion interactions in supercapacitor (SC) electrolytes are considered to have significant influence over the charging process and therefore the overall performance of the SC system. Current strategies used to weaken ionic interactions can enhance the power of SCs, but consequently, the energy density will decrease due to the increased distance between adjacent electrolyte ions at the electrode surface. Herein, we report on the simultaneous enhancement of the power and energy densities of a SC using an ionic mixture electrolyte with different types of ionic interactions. Two types of cations with stronger ionic interactions can be packed in a denser arrangement in mesopores to increase the capacitance, whereas only cations with weaker ionic interactions are allowed to enter micropores without sacrificing the power density. This unique selective charging behavior in different confined porous structure was investigated by solid-state nuclear magnetic resonance experiments and further confirmed theoretically by both density functional theory and molecular dynamics simulations. Our results offer a distinct insight into pairing ionic mixture electrolytes with materials with confined porous characteristics and further propose that it is possible to control the charging process resulting in comprehensive enhancements in SC performance.
Databáze:	MEDLINE
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