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Related Experiment Video

Updated: May 8, 2026

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

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Published on: September 20, 2012

Modulating Built-In Electric Field Strength in Ru/RuO₂ Interfaces through Ni Doping to Enhance Hydrogen Conversion at

Tao Liu¹, Lianqin Wang¹, Bin Chen¹

¹State Key Laboratory of Engines, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China.

Angewandte Chemie (International Ed. in English)

|January 15, 2025

Summary

Developing efficient alkaline hydrogen evolution reaction (HER) catalysts is key for anion exchange membrane water electrolyzers (AEMWEs). Ni-RuO2 demonstrates superior performance due to a built-in electric field (BIEF) enhancing electron transfer and HER kinetics.

Keywords:

AEMWE ampere-level built-in electric field hydrogen evolution reaction

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Area of Science:

Electrochemistry
Materials Science
Computational Chemistry

Background:

Efficient hydrogen evolution reaction (HER) is crucial for anion exchange membrane water electrolyzers (AEMWEs) operating at industrial current densities.
Developing cost-effective and high-performance electrocatalysts is essential for advancing AEMWE technology.

Purpose of the Study:

To identify optimal 3d transition metal-doped RuO2 catalysts for alkaline HER.
To investigate the mechanism behind enhanced catalytic activity using computational methods.

Main Methods:

Density functional theory (DFT) calculations were employed to screen various M-RuO2 (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn) catalysts.
Analysis of electronic structure and interface properties to understand catalytic mechanisms.

Main Results:

Ni-RuO2 was identified as the leading candidate, showing a significant built-in electric field (BIEF) at the Ni-Ru/RuO2 interface.
The BIEF facilitates electron transfer, lowers energy barriers, and accelerates HER kinetics.
Ni-RuO2 achieved an overpotential of 134 mV at 1 A/cm², a Tafel slope of 20.85 mV/dec, with low Ru loading (0.03 mg/cm²).
A Ni-RuO2 based AEMWE demonstrated stable operation at 1 A/cm² for 1000 hours, requiring only 1.71 V.

Conclusions:

The Ni-RuO2 catalyst exhibits exceptional performance for alkaline HER, driven by the BIEF effect.
This finding offers a promising pathway for developing highly efficient and stable AEMWEs for industrial applications.