Enhancing the Energy Storage Capabilities of Ti3C2Tx MXene Electrodes by Atomic Surface Reduction

Arka Saha, Netanel Shpigel, Rosy, Nicole Leifer, Sarah Taragin, Tali Sharabani, Hagit Aviv, Ilana Perelshtein, Gilbert Daniel Nessim, Malachi Noked, Yury Gogotsi

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

MXenes are a large class of 2D materials that consist of few-atoms-thick layers of transition metal carbides, nitrides, or carbonitrides. The surface functionalization of MXenes has immense implications for their physical, chemical, and electronic properties. However, solution-phase surface functionalization often leads to structural degradation of the MXene electrodes. Here, a non-conventional, single-step atomic surface reduction (ASR) technique is adopted for the surface functionalization of MXene (Ti3C2Tx) in an atomic layer deposition reactor using trimethyl aluminum as a volatile reducing precursor. The chemical nature of the modified surface is characterized by X-ray photoelectron spectroscopy and nuclear magnetic resonance techniques. The electrochemical properties of the surface-modified MXene are evaluated in acidic and neutral aqueous electrolyte solutions, as well as in conventional Li-ion and Na-ion organic electrolytes. A considerable improvement in electrochemical performance is obtained for the treated electrodes in all the examined electrolyte solutions, expressed in superior rate capability and cycling stability compared to those of the non-treated MXene films. This improved electrochemical performance is attributed to the increased interlayer spacing and modified surface terminations after the ASR process.

Original languageEnglish
Article number2106294
JournalAdvanced Functional Materials
Volume31
Issue number52
DOIs
StatePublished - 22 Dec 2021

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Keywords

  • 2D metal carbides
  • MXene
  • Ti C T
  • atomic layer deposition
  • atomic surface reduction
  • energy storage

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