Iridium Oxide Shell Structure on Rutile Titanium Oxide for Efficient Supported Catalyst for the Oxygen Evolution...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Proton exchange membrane water electrolysis is key for green hydrogen production.
• High iridium oxide loading limits cost-effectiveness and scalability.
• Developing supported catalysts can reduce precious metal dependence.

Purpose of the Study:

• To synthesize and characterize novel core-shell iridium oxide catalysts on rutile titanium dioxide supports.
• To investigate the impact of structural compatibility on catalyst performance.
• To evaluate the electrochemical activity for water electrolysis.

Main Methods:

• Synthesis of IrO₂ on rutile TiO₂ spheres to create a core-shell structure.
• Characterization using imaging, diffraction, and spectroscopy.
• Electrochemical evaluation of catalytic performance.

Main Results:

• A continuous IrO₂ shell formed on rutile TiO₂ due to structural compatibility.
• Core-shell catalysts exhibited superior mass activity and pseudo-capacitance compared to decorated structures on anatase TiO₂.
• Performance was comparable to commercial unsupported iridium oxide catalysts.

Conclusions:

• The rutile IrO₂-rutile TiO₂ interaction significantly improves catalyst utilization.
• Core-shell structures are promising for low-loading electrolysis systems.
• This approach offers a pathway to reduce cost and reliance on precious metals in hydrogen production.