Durable, OER-Active Compositions of Pt, Ir, and Ru for PEM Fuel Cell Start-Stop Protection

The catalytic performance under simulated transient start-up and shut-down conditions is evaluated for five potential cathode-side catalyst compositions containing Pt, Ir and Ru. Experiments using the rotating disk electrode technique showed that samples containing a solid solution of Ir and Ru on top of a Pt base layer were the most active and the most durable over 1000 simulated start-stop events.