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Etching-Chemistry-Driven Ruthenium Doping on Ti3C2T x MXene for Optimizing Electrochemical Performance.

Shanna Marie M Alonzo1, Jared Kinyon2, Binod K Rai2

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PubMed
Summary

The etching method for MXene synthesis critically impacts its surface chemistry and titanium vacancies. This influences ruthenium ion interactions and electrochemical performance, crucial for designing advanced electrode materials.

Keywords:
2D surface engineeringMXeneenergy storageetching chemistrypseudocapacitanceruthenium doping

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Chemistry

Background:

  • MXene materials are promising for energy storage applications.
  • Surface functionalization and structural defects in MXenes significantly affect their properties.
  • Controlling MXene synthesis is key to optimizing electrochemical performance.

Purpose of the Study:

  • To investigate how different etching chemistries during MXene synthesis affect surface functionalization and titanium vacancies.
  • To understand the influence of these surface modifications on ruthenium (Ru) ion interactions and electrochemical behavior.
  • To provide insights for designing high-performance MXene-based electrodes.

Main Methods:

  • Synthesis of MXene from Ti3AlC2 MAX phase using hydrofluoric acid (HF) and ammonium bifluoride (NH4HF2) etchants.
  • Characterization using zeta potential measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) spectroscopy.
  • Electrochemical performance evaluation using cyclic voltammetry and specific capacitance measurements.

Main Results:

  • Different etchants (HF vs. NH4HF2) yielded MXene surfaces with distinct functional groups and Ti vacancies (MX-(H) vs. MX-(N)).
  • MX-(H) showed significantly enhanced Ru ion adsorption and a 14.4-fold increase in specific capacitance compared to MX-(N) (4.4-fold increase).
  • XRD identified ammonium titanium oxide fluoride on MX-(N), hindering Ru adsorption; XPS and EPR indicated vacancy-assisted Ru doping in MX-(H).

Conclusions:

  • MXene surface chemistry and Ti vacancies, dictated by etching, play a pivotal role in controlling Ru ion adsorption.
  • Rational design of MXene surface functionalization is essential for optimizing cation interactions and enhancing electrochemical electrode performance.
  • This study offers valuable insights for developing next-generation energy storage devices utilizing tailored MXene materials.