Ir Catalyst on High-Electron-Density Support

56× mass activity

Electrons transferred from Cu-TiO2 support to Ir nanoparticles suppress Ir oxidation and stabilize active oxygen species, dramatically enhancing OER activity and stability.

Haoran, Jiang · Zichen, Wang · Zhirang, Liu · Wei, Qu · Jianan, Chen · Lv, Haifeng · Zhong, Jun · Cheng, Niancai

Applied Catalysis B: Environmental 2027

Specifications

Mass activity

{'zh': '5.38', 'en': '5.38'} A mgIr⁻¹

Current density (PEMWE)

{'zh': '3.0', 'en': '3.0'} A cm⁻²

Stable operation time

{'zh': '1000', 'en': '1000'} h

Durability (PEMWE)

{'zh': '600', 'en': '600'} h

Advantages

56× mass activity

Electron transfer from Cu-TiO2 to Ir creates an electron-rich state, stabilizing adsorbed O species, modulating intermediate adsorption and lowering the O*-OOH* energy barrier, thereby greatly accelerating OER kinetics.

Stable over 1000 h

The electronic effect suppresses Ir oxidation during OER, stabilizing Oads-Ir species, enabling long-term activity retention.

High PEMWE performance

In a real membrane electrode, a low Ir loading of 0.3 mgIr cm⁻² achieves 3.0 A cm⁻² at 1.879 V (80 °C) with 600 h durability at 1.0 A cm⁻².

Applications

• PEM water electrolysis：As an anode catalyst, it reduces Ir usage and improves electrolysis efficiency.
• Green hydrogen production：Enables efficient and stable water electrolysis for hydrogen, reducing green hydrogen cost.
• Water electrolysis catalysis：Provides a new design for highly active and stable OER catalysts.
• Electrochemical energy conversion：Improves electrochemical conversion efficiency, supporting renewable energy storage.