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Catalytically Active Sites on Ni5P4 for Efficient Hydrogen Evolution Reaction From Atomic Scale Calculation.
Jun Hu1,2, Xiaofei Cao1, Xin Zhao2
1School of Chemical Engineering, Northwest University, Xi'an, China.
Nickel phosphide (Ni5P4) shows promise as a platinum alternative for water splitting. Its catalytic activity for hydrogen evolution reactions depends on specific atomic arrangements and bonding characteristics, particularly for NiNi and P sites.
Area of Science:
- Materials Science
- Catalysis
- Computational Chemistry
Background:
- Platinum (Pt) is a benchmark cathode material for catalytic water splitting.
- Nickel phosphide (Ni5P4) is emerging as a cost-effective alternative to Pt.
- Understanding active sites in Ni5P4 is crucial for optimizing hydrogen evolution reactions (HER).
Purpose of the Study:
- To theoretically investigate the characteristics of active sites in Ni5P4 for water splitting.
- To identify key parameters governing the catalytic activity of Ni5P4 for HER.
- To assess the potential of Ni5P4 surfaces for efficient hydrogen production.
Main Methods:
- First-principle calculations were employed to study Ni5P4.
- Analysis of NiNi bridge sites and top P sites was performed.
- Machine learning was utilized to review predictive models for P site activity based on bond length.
Main Results:
- NiNi bridge sites exhibit excellent HER performance when the total bond number with neighbors exceeds 14.
- Activity of top P sites is influenced by coplanar atom positions and bond number.
- Partial density of state (PDOS) analysis indicates that P site activity requires appropriate bonding to localize P 3p orbits.
Conclusions:
- Bond number and neighbor position are critical parameters for predicting HER activity in Ni5P4.
- Most low-energy surfaces of Ni5P4 demonstrate significant activity for hydrogen evolution reactions.
- Ni5P4 holds substantial potential as an efficient cathode material for catalytic water splitting.
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