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

Abstract

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.

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:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1334486
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Electrochemistry Communications
Additional Journal Information:
Journal Volume: 72; Journal Issue: C; Journal ID: ISSN 1388-2481
Publisher:
Elsevier
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

Citation Formats

Lin, Zifeng, Rozier, Patrick, Duployer, Benjamin, Taberna, Pierre -Louis, Anasori, Babak, Gogotsi, Yury G., and Simon, Patrice. Electrochemical and in-situ X-ray diffraction studies of Ti3C2Tx MXene in ionic liquid electrolyte. United States: N. p., 2016. Web. https://doi.org/10.1016/j.elecom.2016.08.023.
Lin, Zifeng, Rozier, Patrick, Duployer, Benjamin, Taberna, Pierre -Louis, Anasori, Babak, Gogotsi, Yury G., & Simon, Patrice. Electrochemical and in-situ X-ray diffraction studies of Ti3C2Tx MXene in ionic liquid electrolyte. United States. https://doi.org/10.1016/j.elecom.2016.08.023
Lin, Zifeng, Rozier, Patrick, Duployer, Benjamin, Taberna, Pierre -Louis, Anasori, Babak, Gogotsi, Yury G., and Simon, Patrice. Fri . "Electrochemical and in-situ X-ray diffraction studies of Ti3C2Tx MXene in ionic liquid electrolyte". United States. https://doi.org/10.1016/j.elecom.2016.08.023. https://www.osti.gov/servlets/purl/1334486.
@article{osti_1334486,
title = {Electrochemical and in-situ X-ray diffraction studies of Ti3C2Tx MXene in ionic liquid electrolyte},
author = {Lin, Zifeng and Rozier, Patrick and Duployer, Benjamin and Taberna, Pierre -Louis and Anasori, Babak and Gogotsi, Yury G. and Simon, Patrice},
abstractNote = {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.},
doi = {10.1016/j.elecom.2016.08.023},
journal = {Electrochemistry Communications},
number = C,
volume = 72,
place = {United States},
year = {2016},
month = {8}
}

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Cited by: 7 works
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