Patent ID: 8546288

Claim:
A method comprising: determining SA support (surface area factor) of a catalyst having a specific activity and loading via: SA support ⁡ ( cm support 2 ⁢ / ⁢ cm planar 2 ) = [ “ Baseline ” ⁢ ( A ⁢ / ⁢ mg Pt ) × Mass ⁢ ⁢ Activity ⁢ ⁢ IF × Loading ⁢ ⁢ ( mg Pt ⁢ / ⁢ cm 2 ) ] [ Specific ⁢ ⁢ Activity ⁢ ⁢ ( μA ⁢ / ⁢ cm 2 ) × 0.000001 ⁢ ⁢ ( A ⁢ / ⁢ μA ) ] , Baseline is mass activity of 100 A/g platinum for 5 nm platinum nanoparticles dispersed on a carbon black support, and MassActivityIF is activity required to achieve 1.5 A/cm 2 current density performance at 0.67 V, at a platinum loading of 0.1 mgPt/cm 2 ; selecting a substrate based on SA support ; and depositing the catalyst on the substrate.