Capacitance of two-dimensional titanium carbide MXene and MXene-carbon nanotube composites in organic electrolytesReportar como inadecuado




Capacitance of two-dimensional titanium carbide MXene and MXene-carbon nanotube composites in organic electrolytes - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 CIRIMAT - Centre interuniversitaire de recherche et d-ingenierie des matériaux 2 RS2E - Réseau sur le stockage électrochimique de l-énergie 3 Drexel University

Abstract : Pseudocapacitive materials that store charges by fast redox reactions are promising candidates for designing high energy density electrochemical capacitors. MXenes e recently discovered twodimensional carbides, have shown excellent capacitance in aqueous electrolytes, but in a narrow potential window, which limits both the energy and power density. Here, we investigated the electrochemical behavior of Ti3C2 MXene in 1M solution of 1-ethly-3-methylimidazolium bis- trifluoromethylsulfonyl -imide EMITFSI in acetonitrile and two other common organic electrolytes. This paper describes the use of clay, delaminated and composite Ti3C2 electrodes with carbon nanotubes in order to understand the effect of the electrode architecture and composition on the electrochemical performance. Capacitance values of 85 F g-1 and 245 F cm-3 were obtained at 2 mV s-1, with a high rate capability and good cyclability. In situ X-ray diffraction study reveals the intercalation of large EMIþ cations into MXene, which leads to increased capacitance, but may also be the rate limiting factor that determines the device performance.

Keywords : Electrochemical capacitors Two-dimensional materials MXene X-ray diffraction Carbon nanotube titanium carbide





Autor: Yohan Dall’agnese - Patrick Rozier - Pierre-Louis Taberna - Yury Gogotsi - Patrice Simon -

Fuente: https://hal.archives-ouvertes.fr/



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