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Hydrogen Diffusion in Ti3C2 MXenes
1Helmholtz-Zentrum Berlin für Materialien und Energie, Nanoscale Solid-Liquid Interfaces, Schwarzschildstr. 8, 12489 Berlin, Germany.
Nano Letters
|February 14, 2025
Summary
Understanding hydrogen diffusion in 2D MXenes is key for energy storage. This study reveals that interstitial diffusion is the primary mechanism, crucial for optimizing MXene-based hydrogen energy systems.
Area of Science:
- Materials Science
- Energy Storage
- Computational Chemistry
Background:
- Two-dimensional (2D) MXenes are promising materials for energy storage applications.
- Efficient hydrogen energy storage in MXenes requires a deep understanding of hydrogen diffusion dynamics.
Purpose of the Study:
- To investigate and elucidate the primary hydrogen diffusion mechanisms within 2D MXene structures.
- To calculate key parameters governing hydrogen migration and diffusion.
Main Methods:
- Utilized density functional theory (DFT) calculations.
- Determined hydrogen migration barriers and hopping frequencies.
- Calculated enthalpy and entropy of vacancy formation for various diffusion paths.
Main Results:
- Hydrogen diffusion in 2D MXenes is predominantly governed by interstitial diffusion.
- Calculated diffusion coefficients, prefactors (D0), activation energies (E), and hopping frequencies from ab initio methods for all investigated paths.
Conclusions:
- Interstitial diffusion is the dominant pathway for hydrogen transport in 2D MXenes.
- The findings provide critical insights for designing and enhancing MXene-based hydrogen energy storage devices.
