Electrochemical and in-situ X-ray diffraction studies of Ti3C2Tx MXene in ionic liquid electrolyte
Journal Article
·
· Electrochemistry Communications
- Univ. de Toulouse, CNRS, INPT, UPS, Toulouse cedex (France); Reseau sur le Stockage Electrochimique de l'Energie (RS2E), FR CNRS (France)
- Univ. de Toulouse, CNRS, INPT, UPS, Toulouse cedex (France)
- Drexel Univ., Philadelphia, PA (United States)
2D titanium carbide (Ti3C2Tx MXene) 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. In conclusion, the expansion of interlayer spacing when polarized to negative potentials is explained by steric effect of cation intercalation.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1334486
- Journal Information:
- Electrochemistry Communications, Journal Name: Electrochemistry Communications Journal Issue: C Vol. 72; ISSN 1388-2481
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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