Conventional fuel cell catalysts face significant durability challenges. Oxidative treatments used to remove stabilizers degrade carbon supports and cause nanoparticle agglomeration, lowering catalytic efficiency and lifespan. Low-temperature annealing further limits alloy uniformity, reducing long-term stability and electrochemical performance. The need for a more robust catalyst structure that maintains small particle size and achieves high catalytic activity is critical to advance cost-effective fuel cell adoption.
This invention introduces a method to synthesize platinum alloy nanoparticles on carbon supports using a multi-step thermal process. Organic capping agents are removed under inert or reducing gases (N₂, Ar, H₂) at 270°C to prevent structural damage. The catalyst is then annealed in two stages: 400°C, followed by high-temperature treatment up to 1200°C, which improves alloy homogeneity, maintains particle size, and enhances performance for oxygen reduction reactions in fuel cells. The result is a catalyst with superior activity, stability, and reduced platinum loading requirements.
• High electrochemical surface area, ensuring greater active site availability
• Minimizes particle aggregation and carbon support degradation during treatment
• Superior ORR mass activity, 2.5–6x higher than pure platinum catalysts
• Maintains small, uniform nanoparticles with improved long-term stability
• Reduces platinum content required, lowering overall catalyst cost
• Broadly applicable across different Pt alloy systems
• PCT Application PCT/US09/68364 Filed 12/17/2009, Published WO 2011075125 A1 (03/28/2012)
• US Utility Patent 9,548,501 Granted 01/17/2017 (Application 13/498,665)
• Japan Patent 5,657,689 Granted 01/21/2015 (Application 2012-544458)
• India National Phase Application 3320/DELNP/2012 Filed 06/15/2012
• Germany National Phase Application DE112009005450T5 Filed 06/15/2012
Validated – Catalyst has been tested with strong evidence of high ORR activity, stability, and cost reduction potential. TRL ~5–6.
This technology is available for licensing.
Fuel cell manufacturers, renewable energy integrators, aerospace and defense system developers, and portable electronics companies could adopt this technology to achieve higher efficiency and lower costs in energy conversion systems.
Supplementary diagrams and performance data available upon request.