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Iridium-Based Water Electrolysis Catalysts

This Iridium Oxide catalyst is developed for oxygen evolution reaction (OER) anodes in proton exchange membrane water electrolysis (PEMWE). With an iridium loading of 78 ± 0.5 wt.%, a specific surface area of 110 ± 20 m²/gIr and uniformly dispersed 3-4 nm nanoparticles, the catalyst is designed to maximize active-site exposure while maintaining stable electrode-layer formation.

The catalyst delivers mass activity >100 A/gIr at 1.445 V and an overpotential <260 mV at 10 mA/cm², demonstrating strong intrinsic OER kinetics. Its high batch consistency and favorable slurry dispersibility make it suitable for catalyst ink preparation, MEA coating validation and scale-up development in PEM electrolyzer systems.

Key features

High IrOx Active-Site Utilization: Uniformly dispersed 3-4 nm IrOx nanoparticles and high surface area promote efficient OER catalytic sites.

Excellent OER Activity: Mass activity exceeds 100 A/gIr at 1.445 V, supporting high-performance PEMWE anode operation.

Low Overpotential: Overpotential is <260 mV at 10 mA/cm², indicating favorable oxygen-evolution kinetics.

Stable and Scalable Production: Single-batch capacity ≥100 g with high batch consistency supports reliable pilot-scale and commercial evaluation.

Technical Specifications

Parameter

S700

Category

IrOx Catalyst

Iridium Loading (wt.%)

78 ± 0.5

Mass Activity

>100 A/gIr @ 1.445 V

Specific Surface Area of Catalyst

110 ± 20 m²/g _Ir

Nanoparticle Size (nm)

3-4

Overpotential (10 mA/cm²)

<260 mV

Application

PEM water electrolyzer anode catalyst layers and MEAs.

Green hydrogen electrolyzer stack development and performance validation.

PEM-based electrochemical hydrogen peroxide generation, supporting the development of stable anode catalyst layers and integrated MEAs for on-site H₂O₂ production systems.

Iridium-Based Water Electrolysis Catalysts