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YTaNO2 Janus MXene as an optimal electrocatalyst for the hydrogen evolution reaction
Latifa Bettadj1, Reda M Boufatah1, Tarik Ouahrani1,2
1Laboratoire de Physique Théorique, Université de Tlemcen, BP 119, 13000, Algeria.
Janus MXenes show promise for electrocatalysis. Researchers found that YTaNO2 MXene exhibits optimal hydrogen adsorption energetics, making it a superior catalyst for the hydrogen evolution reaction (HER).
Area of Science:
- Materials Science
- Catalysis
- Computational Chemistry
Background:
- Janus MXenes offer tunable electronic properties for electrocatalysis.
- Optimizing hydrogen adsorption is crucial for efficient hydrogen evolution reaction (HER) catalysts.
Purpose of the Study:
- To investigate the potential of Janus YMNO2 MXenes for HER catalysis.
- To identify MXene compositions with ideal hydrogen adsorption energetics.
Main Methods:
- First-principles calculations were employed to study a series of Janus YMNO2 MXenes.
- Phonon calculations assessed material stability.
- Hydrogen adsorption calculations evaluated catalytic performance.
Main Results:
- YHfNO2 and YTaNO2 were found to be dynamically stable.
- Significant variations in hydrogen binding strengths were observed across different metal substitutions.
- YTaNO2 MXene demonstrated near-thermoneutral hydrogen adsorption free energy (ΔG_H* ≈ 0 eV).
Conclusions:
- Metal-layer substitution is an effective strategy to enhance HER activity in Janus MXenes.
- YTaNO2 MXene exhibits excellent catalytic potential due to balanced hydrogen binding and efficient charge transfer.
- Tuning internal electric fields in Janus MXenes can optimize electrocatalytic performance.
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