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Ni₅P₄-CeO₂ heterointerface-stabilized Ru nanoparticles for efficient electrochemical water splitting.

Xi-Wei Yuan¹, Peng-Fei Xie², Jian Peng²

¹Faculty of Chemical Engineering, Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming University of Science and Technology, Kunming 650500, China; Ningbo Key Laboratory of High Energy Density Battery, Institute of Carbon Neutrality, Zhejiang Wanli University, Ningbo 315100, China.

Journal of Colloid and Interface Science

|May 7, 2026

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A new bifunctional electrocatalyst, Ru@Ni5P4-CeO2/NF, enhances green hydrogen production via anion exchange membrane water electrolysis (AEMWE). This catalyst demonstrates high efficiency and durability for overall water splitting, paving the way for practical AEMWE applications.

Area of Science:

Materials Science
Electrochemistry
Green Energy Technologies

Background:

Anion exchange membrane water electrolysis (AEMWE) is crucial for green hydrogen production.
Commercialization of AEMWE is hindered by the need for efficient and durable electrocatalysts.
Developing bifunctional electrocatalysts is essential for advancing overall water splitting.

Purpose of the Study:

To construct a novel Ru@Ni5P4-CeO2/NF bifunctional electrocatalyst.
To investigate the electrocatalytic performance for overall water splitting.
To demonstrate the potential for practical anion exchange membrane water electrolysis applications.

Main Methods:

Rational construction of a heterostructure electrocatalyst (Ru@Ni5P4-CeO2/NF) via interface engineering.

Keywords:

Anion exchange membrane water electrolysis Bifunctional HER/OER electrocatalysis Heterointerface engineering Interfacial electronic coupling Multicomponent synergistic effects Ru-decorated heterostructures Surface reconstruction

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In situ experimental characterization to reveal interfacial coupling effects.

Electrochemical testing for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) kinetics.

Assembly and testing of an anion exchange membrane water electrolysis cell.

Main Results:

The Ru@Ni5P4-CeO2/NF catalyst exhibits strong interfacial coupling, enhancing HER and OER kinetics.
Achieved low overpotentials: 30 ± 1 mV for HER and 220 ± 2 mV for OER at 10 mA cm⁻².
An AEMWE cell using this catalyst operated at 1000 mA cm⁻² with a cell voltage of 1.86 ± 0.01 V.
Demonstrated stable operation at 500 mA cm⁻² for 300 hours with negligible degradation.

Conclusions:

The developed heterointerface engineering strategy effectively boosts electrochemical water splitting performance.
Ru@Ni5P4-CeO2/NF shows outstanding bifunctional electrocatalytic activity and durability.
This work provides a generalizable approach for designing multifunctional electrocatalysts for practical AEMWE.