High-Stability RuNi/C Electrocatalyst for Efficient Hydrogen Oxidation Reaction in Alkaline Condition.

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Developing efficient and stable electrocatalysts for the hydrogen oxidation reaction (HOR) is essential for fuel cell technologies.
• Ruthenium (Ru)-based catalysts face challenges in maintaining activity and reliability at high potentials.

Purpose of the Study:

• To design and synthesize a novel Ru-based electrocatalyst with enhanced activity and stability for the HOR.
• To investigate the structural and electronic properties of the new catalyst for improved performance.

Main Methods:

• Synthesis of NiRu alloy nanoparticles tightly wrapped with a carbon layer (RuNi/C).
• Electrochemical characterization of the RuNi/C catalyst, including kinetic current density measurements.
• Evaluation of catalyst stability at high potentials.

Main Results:

• The RuNi/C catalyst demonstrated a 2.2-fold and 8.3-fold increase in kinetic current density compared to commercial Pt/C and Ru/C, respectively.
• The catalyst maintained a current density of 2.93 mA cm⁻² at 0.6 V vs RHE, indicating improved stability.
• The NiRu alloy facilitated electron redistribution and optimized surface adsorption, while the carbon layer provided conductivity and protection.

Conclusions:

• The developed RuNi/C nanoparticle catalyst offers superior activity and stability for the hydrogen oxidation reaction.
• This novel catalyst holds potential for industrial applications in fuel cells.
• The study presents a new strategy for designing highly active and stable electrocatalytic systems.