Ordered Porous TiO₂@C Layer as an Electrocatalyst Support for Improved Stability in PEMFCs

Area of Science:

• Materials Science
• Electrochemistry
• Energy Conversion

Background:

• Proton exchange membrane fuel cells (PEMFCs) are crucial for clean energy.
• High power density, electrocatalytic performance, and stability are key challenges.
• Ordered array structures are desired for membrane electrode assemblies.

Purpose of the Study:

• To develop a novel porous Pt-TiO2@C ordered integrated electrode.
• To enhance catalyst utilization and electrochemical stability in PEMFC cathodes.
• To investigate the structural benefits on mass transport and durability.

Main Methods:

• Preparation of a new porous Pt-TiO2@C ordered integrated electrode.
• Application of the electrode to the cathode of a PEMFC.
• Evaluation of catalytic activity, Pt utilization, and durability through accelerated testing.

Main Results:

• The Pt-TiO2@C support significantly reduces catalyst loss compared to conventional carbon.
• The ordered structure improves Pt utilization and reduces mass transport resistance.
• The electrode demonstrated excellent catalytic activity and superior stability, with <30% electrochemical surface area decay after 3000 cycles, versus 80% for commercial Pt/C.

Conclusions:

• The developed porous ordered Pt-TiO2@C electrode offers enhanced performance and durability for PEMFCs.
• The unique structure minimizes catalyst degradation and improves efficiency.
• This material represents a significant advancement for next-generation fuel cell technology.