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Atomic-Level La-Modulated NiFeP Bifunctional Electrocatalysts for High Efficiency Overall Water Splitting
1Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China.
Rare-earth La-modulated NiFeP composites show excellent performance for hydrogen and oxygen evolution reactions. This new catalyst enables efficient and durable overall water splitting, outperforming many existing transition metal catalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient electrocatalysts is crucial for sustainable energy technologies.
- Transition metal phosphides are promising for electrocatalytic water splitting.
- Rare-earth element modulation can optimize catalyst performance.
Purpose of the Study:
- To synthesize and characterize rare-earth La-modulated NiFeP composites.
- To evaluate the electrocatalytic activity of La0.3-NiFeP for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
- To assess the performance of La0.3-NiFeP in overall water splitting.
Main Methods:
- Co-precipitation route followed by in situ phosphatization.
- Electrochemical characterization in 1 M KOH.
- Testing in a dual-electrode water electrolyzer setup.
Main Results:
- La0.3-NiFeP catalyst exhibits remarkable HER and OER activity.
- Achieved 10 mA cm-2 at low overpotentials: 97 mV for HER and 271 mV for OER.
- Demonstrated excellent durability and efficient overall water splitting at 1.59 V.
Conclusions:
- La-modulated NiFeP is a highly effective electrocatalyst for water splitting.
- Optimized electronic structure contributes to superior catalytic performance.
- This catalyst surpasses many reported transition metal-based electrocatalysts.
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