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Title: Electrochemical and in-situ X-ray diffraction studies of Ti 3C 2T x MXene in ionic liquid electrolyte

2D titanium carbide (Ti 3C 2T x 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 Ti 3C 2T x 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 Ti 3C 2T x flakes decreases during positive polarization, which can be ascribed to either electrostatic attraction effect between intercalated TFSI– anions and positively charged Ti 3C 2T x 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.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [1]
  1. Univ. de Toulouse, CNRS, INPT, UPS, Toulouse cedex (France); Reseau sur le Stockage Electrochimique de l'Energie (RS2E), FR CNRS (France)
  2. Univ. de Toulouse, CNRS, INPT, UPS, Toulouse cedex (France)
  3. Drexel Univ., Philadelphia, PA (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Electrochemistry Communications
Additional Journal Information:
Journal Volume: 72; Journal Issue: C; Journal ID: ISSN 1388-2481
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; supercapacitor; Ti3C2; in-situ XRD; ionic liquid; MXene; 2D carbide
OSTI Identifier:
1334486