Abstract
Ion 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, V2C, 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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2305-2309 |
| Number of pages | 5 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 6 |
| Issue number | 12 |
| DOIs | |
| State | Published - 2015 |
| Externally published | Yes |
Bibliographical note
KAUST Repository Item: Exported on 2021-10-15Acknowledgements: We thank B. Anasori for help with V2AlC 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).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- General Materials Science