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Plasma-Activated Solutions Regulate Surface-Terminating Groups Enhancing Pseudocapacitive Ti3C2Tx Electrode

Yonghong Luo1, Huachao Yang1, Chongyan Ying1

  • 1State Key Laboratory of Clean Energy Utilization, College of Energy Engineering, Zhejiang University, Hangzhou, 310027, China.

Small (Weinheim an Der Bergstrasse, Germany)
|September 4, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel plasma method to enhance two-dimensional transition metal carbides and nitrides (MXenes) for supercapacitors. The optimized MXenes show improved pseudocapacitive performance and stability for energy storage.

Keywords:
MXeneenergy storagefunctional groupsnonthermal plasmapseudocapacitive response

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Two-dimensional transition metal carbides and nitrides (MXenes) are promising pseudocapacitive materials for supercapacitors.
  • Enhancing surface oxygen groups in Ti3C2Tx can improve pseudocapacitive charge storage but faces challenges in functionalization and stability.
  • Existing methods lack effective strategies for generating abundant and stable oxygen terminal groups on MXenes.

Purpose of the Study:

  • To develop a low-temperature, environmentally friendly plasma-based method for functionalizing Ti3C2Tx MXenes with abundant and stable oxygen terminal groups.
  • To investigate the impact of different plasma discharge environments (Ar, O2, H2) on the structural and electrochemical properties of Ti3C2Tx.
  • To evaluate the supercapacitor performance of the plasma-treated MXenes.

Main Methods:

  • Utilized nonequilibrium plasma interacting with Ti3C2Tx dispersion.
  • Investigated Ar, O2, and H2 plasma discharge environments.
  • Analyzed structural characteristics using high-resolution X-ray photoelectron spectroscopy (XPS).

Main Results:

  • A high content (78.5%) of surface-terminating oxygen groups was achieved in H2 plasma-treated Ti3C2Tx.
  • Ti3C2Tx treated with H2 plasma maintained its morphology with significantly reduced fluorine content.
  • H2 plasma-treated Ti3C2Tx exhibited excellent capacitive performance (418.3 F g-1 at 2 mV s-1) and stability (95.88% capacity retention after 10,000 cycles).

Conclusions:

  • The developed plasma method effectively generates abundant and stable oxygen terminal groups on Ti3C2Tx.
  • H2 plasma treatment is a superior method for enhancing the pseudocapacitive properties and electrochemical stability of Ti3C2Tx for supercapacitors.
  • This approach offers a pathway for developing advanced nanostructured electrode materials for renewable energy storage.