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Mo-Induced Crystalline/Amorphous Ru-Ni3Fe/NiMoFeOx Heterointerface for Efficient and Robust Overall Water Splitting
Xiaojie Wang1,2, Shuhuan Han1,2, Yingjie Liu1,2
1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 3, 2026
Summary
This study introduces a novel bifunctional electrocatalyst, Ru-Ni3Fe/NiMoFeOx, for efficient alkaline water splitting. The catalyst demonstrates excellent performance in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), achieving high current densities with low overpotentials.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient and stable bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for alkaline water splitting.
- Existing catalysts often face challenges in achieving high performance and long-term stability.
Purpose of the Study:
- To design and synthesize a novel Ru-Ni3Fe/NiMoFeOx heterostructure electrocatalyst.
- To investigate the dual role of Molybdenum (Mo) in promoting heterostructure formation and controlling nanoparticle size.
- To evaluate the electrocatalytic performance of the catalyst for overall water splitting.
Main Methods:
- Synthesis of Ru-doped Ni3Fe alloy nanoparticles and amorphous NiMoFeOx nanosheets.
- Fabrication of a crystalline/amorphous heterostructure.
- Electrochemical characterization including overpotential measurements at high current densities for HER and OER.
- Assembly and testing of a water splitting electrolyzer.
Main Results:
- The Ru-Ni3Fe/NiMoFeOx catalyst exhibited low overpotentials of 117 mV for HER and 275 mV for OER at 1000 mA cm-2.
- The catalyst enabled stable operation of a water splitting electrolyzer at 1.91 V and 1000 mA cm-2 for 2000 hours.
- Molybdenum played a dual role in promoting amorphous phase formation and suppressing nanoparticle growth, leading to abundant heterointerfaces and active sites.
Conclusions:
- The developed Ru-Ni3Fe/NiMoFeOx heterostructure is a highly efficient and stable bifunctional electrocatalyst for alkaline water electrolysis.
- Leveraging the dual role of Mo is an effective strategy for designing advanced electrocatalysts with crystalline/amorphous heterointerfaces.
- This work provides valuable insights for developing catalysts for high-current-density alkaline water splitting applications.
