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Tungsten regulated medium-entropy heterostructure as a highly efficient electrocatalyst for oxygen evolution
Jianliang Yuan1,2, Qianglong Qi1,3, Qingwen Wan1,3
1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, China. chxzhang@kust.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|March 5, 2025
Summary
Tungsten-modified medium-entropy alloys (MEAs) show enhanced oxygen evolution reaction (OER) activity for water splitting. This metal-organic framework templating strategy creates efficient electrocatalysts with improved electronic structure and synergistic effects.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Medium-entropy alloys (MEAs) are promising electrocatalysts for water splitting.
- Optimizing MEA efficiency for catalysis remains a significant challenge.
Purpose of the Study:
- To develop highly efficient electrocatalysts for the oxygen evolution reaction (OER) using a novel templating strategy.
- To investigate the effect of tungsten incorporation on the catalytic performance of FeCoNi MEAs.
Main Methods:
- A metal-organic framework (MOF) templating strategy was employed to synthesize FeCoNi MEA nanoparticles.
- Tungsten was incorporated to create FeCoNi-W medium-entropy heterostructure catalysts.
- Electrochemical performance for OER was evaluated.
Main Results:
- The FeCoNi-W heterostructure catalysts exhibited excellent OER activity (270 mV at 10 mA cm⁻²) and a low Tafel slope (43.2 mV dec⁻¹).
- The catalyst demonstrated superior stability, operating for 50 hours at 100 mA cm⁻².
- Tungsten incorporation modified the electronic structure, enhancing reactant binding and intermediate formation.
Conclusions:
- Tungsten-refined FeCoNi-W MEA heterostructures are highly efficient and stable electrocatalysts for OER.
- The MOF templating and local chemical modification approach provides a pathway for designing advanced M/HEAs.
- This study offers a foundation for tailoring M/HEAs for enhanced catalytic applications.
