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Ambipolar Electrochemistry of Pre‐Intercalated Ti 3 C 2 T x MXene in Ionic Liquid Electrolyte

Journal Article · · Batteries & Supercaps
 [1];  [2];  [1];  [1];  [2];  [2];  [1]
  1. A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel University Philadelphia PA 19104 USA
  2. Department of Chemistry Indian Institute of Technology Hyderabad Kandi 502284, Sangareddy Telangana State India
Abstract

Cation intercalation with or without redox remains the dominant charge storage mechanism for two‐dimensional (2D) Ti3C2TxMXene. 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 Ti3C2Txin ionic liquid electrolyte over a 2.5 V electrochemically stable window. The experiments are conducted on a thin Ti3C2Txfilm current collector coated with an electroactive layer of small flakes (∼150 nm) of Ti3C2Txpre‐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 Ti3C2Txflakes. 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.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-05CH11231
OSTI ID:
2422595
Journal Information:
Batteries & Supercaps, Journal Name: Batteries & Supercaps Journal Issue: 5 Vol. 6; ISSN 2566-6223
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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