Pt-free carbon-based fuel cell catalyst prepared from spherical polyimide for enhanced oxygen diffusion

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Platinum is a scarce and expensive precious metal, hindering the widespread adoption of polymer electrolyte fuel cells.
• Developing cost-effective and efficient non-precious metal (NPM) catalysts is crucial for the commercialization of fuel cell technology.

Purpose of the Study:

• To synthesize and characterize a novel NPM cathode catalyst for polymer electrolyte fuel cells.
• To evaluate the performance and durability of the developed NPM catalyst in fuel cell applications.

Main Methods:

• Synthesis of 60 nm Fe-containing polyimide nanoparticles via precipitation polymerization.
• Multistep pyrolysis of nanoparticles to create the NPM catalyst.
• Fuel cell testing under specific conditions (0.2 MPa air, 80°C).

Main Results:

• Successfully synthesized uniform 60 nm Fe-containing polyimide nanoparticles.
• Developed an NPM catalyst retaining small particle size after pyrolysis.
• Achieved a remarkable fuel cell performance of 1.0 A cm⁻² at 0.46 V at 80°C under 0.2 MPa air.
• Demonstrated promising durability for fuel cell applications.

Conclusions:

• The developed Fe-based NPM catalyst offers a viable alternative to platinum-based catalysts.
• The synthesis method allows for controlled nanoparticle size, crucial for catalyst performance.
• The catalyst exhibits excellent performance and durability, supporting the globalization of fuel cell technology.