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Functionalized 3D Mo2N Current Collectors Drive Multi-Phase Ni-based Synergy and Mitigate Surface Reconstruction for
Meilian Tu1, Zhixiao Zhu1, Hao Yang2
1College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan University, Changsha, 410082, P. R. China.
A novel Mo2N/NiSe/Ni2P catalyst on nickel foam efficiently produces hydrogen via electrochemical water splitting. This advanced material overcomes oxygen evolution reaction bottlenecks, offering high activity and stability for sustainable energy solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Electrochemical water splitting is key for sustainable hydrogen production.
- The oxygen evolution reaction (OER) presents kinetic, activity, and stability challenges.
- Developing efficient, non-precious metal OER catalysts is crucial for industrial applications.
Purpose of the Study:
- To design and synthesize a multi-phase heterostructure catalyst for improved OER performance.
- To address the limitations of sluggish kinetics, poor activity, and stability in OER.
- To provide a new strategy for high-performance, non-precious metal OER catalysts.
Main Methods:
- Fabrication of Mo2N-functionalized nickel foam (NF@Mo2N).
- Transformation into a Mo2N/NiSe/Ni2P multi-phase heterostructure via selenization and phosphorization.
- Electrochemical characterization to evaluate OER performance and stability.
- Theoretical analysis using density functional theory (DFT) to understand catalytic mechanisms.
Main Results:
- The optimized NF@Mo2N/NiSe/Ni2P catalyst achieved an overpotential of 242 mV at 10 mA cm-2.
- Demonstrated remarkable stability over 350 hours of operation.
- Achieved a low overpotential of 395 mV at a high current density of 800 mA cm-2.
- Outperformed pristine control samples in OER activity and stability.
Conclusions:
- The Mo2N/NiSe/Ni2P heterostructure effectively enhances conductivity and optimizes adsorption energies for OER intermediates.
- The designed catalyst offers a new strategy for developing robust, non-precious metal OER catalysts.
- This work advances sustainable hydrogen production through improved electrochemical water splitting.
