Two-Dimensional Vanadium Carbide (MXene) as Positive Electrode for Sodium-Ion Capacitors
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AbstractIon capacitors store energy through intercalation of cations into an electrode at a faster rate than in batteries and within a larger potential window. These devices reach a higher energy density compared to electrochemical double layer capacitor. Li-ion capacitors are already produced commercially, but the development of Na-ion capacitors is hindered by lack of materials that would allow fast intercalation of Na-ions. Here we investigated the electrochemical behavior of 2D vanadium carbide, V<inf>2</inf>C, from the MXene family. We investigated the mechanism of Na intercalation by XRD and achieved capacitance of ∼100 F/g at 0.2 mV/s. We assembled a full cell with hard carbon as negative electrode, a known anode material for Na ion batteries, and achieved capacity of 50 mAh/g with a maximum cell voltage of 3.5 V.
CitationDall’Agnese, Y., Taberna, P.-L., Gogotsi, Y., & Simon, P. (2015). Two-Dimensional Vanadium Carbide (MXene) as Positive Electrode for Sodium-Ion Capacitors. The Journal of Physical Chemistry Letters, 6(12), 2305–2309. doi:10.1021/acs.jpclett.5b00868
SponsorsWe thank B. Anasori for help with V<INF>2</INF>AlC synthesis. This work was supported by the Partner University Fund (PUF) of French Embassy. Y.D.A. was supported by the European Research Council (ERC, Advanced Grant, ERC-2011-AdG, Project 291543 - IONACES). P.S. acknowledges funding from the Chair of Excellence of the Airbus group foundation Embedded multi-functional materials. Y.G. was partially supported by the Competitive Research Grant from King Abdullah University for Science & Technology (KAUST).
PublisherAMER CHEMICAL SOC