Bifunctional Pt–Ir nanoparticle catalysts for oxygen reduction and evolution reactions: investigating the influence of surface composition on the catalytic properties

Unitized regenerative fuel cells demand efficient bifunctional catalysts for oxygen reduction and evolution reactions. Here, we study iridium-decorated platinum nanoparticles. Ir 40 /Pt 60 displayed the highest OER mass activity, surpassing Ir black, whereas Ir 20 /Pt 80 showed the highest efficiency.