Electrochemical and in-situ X-ray diffraction studies of Ti3C2Tx MXene in ionic liquid electrolyte
Résumé
2D titanium carbide (Ti3C2TxMXene) showed good capacitance in both organic and neat ionic liquid electrolytes,
but its charge storage mechanism is still not fully understood. Here, electrochemical characteristics of Ti3C2Tx
electrode were studied in neat EMI-TFSI electrolyte. A capacitive behavior was observed within a large electrochemical
potential range (from −1.5 to 1.5 V vs. Ag). Intercalation and de-intercalation of EMI+ cations and/or
TFSI− anions were investigated by in-situ X-ray diffraction. Interlayer spacing of Ti3C2Tx flakes decreases during
positive polarization, which can be ascribed to either electrostatic attraction effect between intercalated TFSI−
anions and positively charged Ti3C2Tx nanosheets or steric effect caused by de-intercalation of EMI+ cations.
The expansion of interlayer spacing when polarized to negative potentials is explained by steric effect of cation
intercalation.
Domaines
Matériaux| Origine | Fichiers produits par l'(les) auteur(s) |
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