Few-layered graphene-supported palladium as a highly efficient catalyst in oxygen reduction reaction.

New, active and stable catalysts competitive to Pt catalysts are necessary for fuel cell development. Here, we present few-layered graphene-supported Pd, revealing a performance superior to Pt/C and Pd/C ORR (positive half-wave potential shift E(1/2) by 50 mV, approximately one order of magnitude higher area- and mass-normalized current densities, I(area), I(mass), after 2500 cycles). The catalyst preparation is easily scalable, simple, inexpensive and eco-friendly.