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Effect of Interlayer Spaces and Interfacial Structures on High-Performance MXene/Ionic Liquid Supercapacitors: A

Xinyue Sun1,2, Yao Li1,3, Yanlei Wang1

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|January 12, 2024
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Summary

Molecular dynamics simulations reveal that MXene surface terminations and interlayer spacing significantly impact supercapacitor performance. Hydroxyl (-OH) terminations enhance cation alignment, boosting capacitance by optimizing the electrical double layer (EDL) structure.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • MXenes and ionic liquids (ILs) show promise for high-performance supercapacitors.
  • Strategies like surface functionalization and interlayer tuning are used to improve performance.
  • Lack of theoretical understanding, especially regarding confined IL microenvironments, limits device optimization.

Purpose of the Study:

  • To investigate the influence of MXene interlayer spacing and surface terminations on supercapacitor performance using molecular dynamics simulations.
  • To provide theoretical guidance for optimizing MXene-based supercapacitors.

Main Methods:

  • Molecular dynamics simulations were employed to study MXene electrodes and IL electrolytes.
  • Analysis included ion number density, charge density, and surficial electron density.
  • Electrical double layer (EDL) formation and ion orientation were examined.

Main Results:

  • An EDL structure forms at the MXene-IL interface.
  • -OH terminations promote vertical cation alignment via hydrogen bonding, increasing ion retention.
  • A 14 Å interlayer spacing showed a ~25% capacitance increase compared to 10 Å at 2 V.
  • Ti3C2(OH)2 electrodes exhibited higher differential capacitance than Ti3C2O2 electrodes.

Conclusions:

  • Interlayer spacing and MXene surface terminations critically influence supercapacitor performance.
  • Hydrogen bonding between -OH terminations and ILs plays a key role in enhancing capacitance.
  • Simulation results offer theoretical insights for designing advanced MXene-based supercapacitors.