Unlocking Proton Exchange Membrane Fuel Cell Performance with Porous PtCoV Alloy Catalysts

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Carbon-supported platinum-based catalysts in fuel cells are prone to sulfonate poisoning, diminishing platinum utilization and overall activity.
• Developing durable and highly active electrocatalysts is crucial for advancing fuel cell technology.

Purpose of the Study:

• To synthesize a novel porous platinum-cobalt-vanadium (PtCoV) nanoalloy catalyst embedded in carbon nanofibers.
• To enhance the intrinsic activity and durability of platinum-based catalysts by mitigating sulfonate poisoning.
• To improve platinum utilization and fuel cell performance.

Main Methods:

• Synthesis of porous PtCoV nanoalloy nanoparticles encapsulated within porous carbon nanofibers.
• Characterization of the catalyst's structure, composition, and electrochemical properties.
• Evaluation of catalyst performance in fuel cell applications, focusing on activity, durability, and platinum utilization.

Main Results:

• The PtCoV nanoalloy exhibits optimized oxygen binding energy and enhanced dissolution energy barriers for Pt and Co atoms.
• The porous nanostructure and encapsulation strategy create a non-contact Pt-ionomer interface, effectively mitigating sulfonate poisoning.
• The optimized catalyst achieved a peak power density of 29.0 kW g_Pt ^-1 and an initial mass activity of 0.69 A mg_Pt ^-1, exceeding U.S. Department of Energy 2025 targets.

Conclusions:

• The developed porous PtCoV nanoalloy catalyst demonstrates significantly enhanced intrinsic activity and durability compared to conventional catalysts.
• The rational design effectively addresses sulfonate poisoning and improves platinum utilization, leading to superior fuel cell performance.
• This study presents a promising strategy for developing highly active and durable low-platinum electrocatalysts for future fuel cell applications.