Journal article
Ambipolar Electrochemistry of Pre-Intercalated Ti3C2Tx MXene in Ionic Liquid Electrolyte
Batteries & supercaps, e202300009
20 Mar 2023
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Cation intercalation with or without redox remains the dominant charge storage mechanism for two-dimensional (2D) Ti3C2Tx MXene. Anion-based charge storage remains unexplored due to intrinsic negative surface charge of MXenes preventing spontaneous intercalation of anions and irreversible oxidation of Ti at anodic potentials in aqueous electrolytes. In this work, we report on the ambipolar electrochemical behavior of the Ti3C2Tx in ionic liquid electrolyte over a 2.5 V electrochemically stable window. The experiments are conducted on a thin Ti3C2Tx film current collector coated with an electroactive layer of small flakes (similar to 150 nm) of Ti3C2Tx pre-intercalated with 1-ethyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)-imide (EMIM-TFSI) ionic liquid. Couples of redox peaks with a very small potential separation during the voltage sweep are observed at high negative (-0.75 V vs. Ag wire) and high positive (+0.75 V vs. Ag wire) potentials. Our experimental electrochemical data combined with density functional theory (DFT) calculations suggest feasibility of pseudo-intercalation of TFSI anions between Ti3C2Tx flakes. This study provides a pathway for elucidating anion intercalation for different MXene chemistries in solvent-free electrolytes, which can lead to development of MXene based energy storage devices with improved performance.
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Details
- Title
- Ambipolar Electrochemistry of Pre-Intercalated Ti3C2Tx MXene in Ionic Liquid Electrolyte
- Creators
- Geetha Valurouthu - Drexel UniversityRachita Panigrahi - Indian Institute of Technology HyderabadMohit Saraf - Drexel UniversityChristopher E. Shuck - Drexel UniversityBhabani S. Mallik - Indian Institute of Technology HyderabadNarendra Kurra - Indian Institute of Technology HyderabadYury Gogotsi - Drexel University
- Publication Details
- Batteries & supercaps, e202300009
- Publisher
- Wiley
- Number of pages
- 11
- Grant note
- Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center (EFRC) - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences; United States Department of Energy (DOE) CRG/2021/001094 / Science & Engineering Research Board, India 2558/FNPDR/2020 / United States-India Educational Foundation, New Delhi, India CRG/2021/001094 / Indian Institute of Technology Hyderabad, India
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000953535800001
- Scopus ID
- 2-s2.0-85150241132
- Other Identifier
- 991020373683204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Electrochemistry
- Materials Science, Multidisciplinary