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Lattice-Disordered High-Entropy Alloy Engineered by Thermal Dezincification for Improved Catalytic Hydrogen Evolution
Kang Huang1,2, Xun Cao3, Yu Lu3
1Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China.
Advanced Materials (Deerfield Beach, Fla.)
|June 5, 2024
Summary
Researchers created a disordered senary platinum-iridium-nickel-cobalt-iron-zinc (PtIrNiCoFeZn) high-entropy alloy (HEA) using zinc. This disordered HEA exhibits significantly enhanced electrocatalytic hydrogen evolution reaction (HER) activity and stability in alkaline solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Disordered crystal structures, characterized by vacancies or lattice misarrangement, enhance the electrocatalytic hydrogen evolution reaction (HER).
- High-entropy alloys (HEAs) offer tunable properties for advanced applications, including catalysis.
Purpose of the Study:
- To synthesize a senary PtIrNiCoFeZn HEA with a highly disordered lattice structure.
- To investigate the effect of lattice disorder on the HER performance in alkaline media.
- To introduce a novel method for characterizing disordered lattices.
Main Methods:
- Senary PtIrNiCoFeZn HEA synthesis utilizing zinc as a sacrificial component due to its low evaporation temperature.
- Characterization of lattice disorder using thermal diffusion scattering (TDS) in transmission electron microscopy (TEM).
- Density functional theory (DFT) calculations to elucidate the mechanism of lattice disorder on HER.
- Experimental measurements of alkaline HER activity and stability.
Main Results:
- The PtIrNiCoFeZn HEA exhibited a highly disordered lattice structure confirmed by TDS.
- DFT calculations indicated that lattice disorder accelerates both Volmer and Tafel steps in HER and optimizes electronic structure near the Fermi energy.
- Experimental results demonstrated anomalously high alkaline HER activity and excellent stability for the disordered HEA.
Conclusions:
- A novel approach for preparing lattice-disordered HEAs was developed using a sacrificial zinc component.
- The study provides a TDS characterization method for revealing disordered lattices.
- This work opens new avenues for designing and developing efficient electrocatalysts with asymmetrically disordered lattices for HER.
Keywords:
high‐entropy alloyshydrogen evolution reactionlattice‐disorderedthermal dezincificationthermal diffusion scatteringMore Related Videos
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