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Title: Electrochemical and in-situ X-ray diffraction studies of Ti3C2Tx MXene in ionic liquid electrolyte

Journal Article · · Electrochemistry Communications
 [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)

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:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1334486
Journal Information:
Electrochemistry Communications, Vol. 72, Issue C; ISSN 1388-2481
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 114 works
Citation information provided by
Web of Science

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Revealing the Pseudo‐Intercalation Charge Storage Mechanism of MXenes in Acidic Electrolyte journal May 2019
Clay-Inspired MXene-Based Electrochemical Devices and Photo-Electrocatalyst: State-of-the-Art Progresses and Challenges journal January 2018
A robust hierarchical microcapsule for efficient supercapacitors exhibiting an ultrahigh current density of 300 A g −1 journal January 2018
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Functional MXene Materials: Progress of Their Applications journal August 2018
Computational Insights into Materials and Interfaces for Capacitive Energy Storage journal April 2017
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