Recent Advances in Platinum Monolayer Fuel Cell Electrocatalysts for the Oxygen Reduction Reaction

摘要

We report our recent advances in highly active, stable electrocatalysts comprising Pt monolayers on Pd and PdAu alloy nanoparticles for the oxygen reduction reaction. Their high advantageous characteristics resulted from the interactions induced by supporting nanoparticle cores on Pt shells. The Pt_(ML)/Pd/C electrocatalyst exhibited only a small loss of activity after 100,000 potential cycles from 0.7 to 0.9V. With the more stable Pd9Au1 alloy core, the Pt_(ML)/Pd9Au1/C catalyst showed minimal degradation in activity over 100,000 cycles between potentials 0.6 and 1.0 V. Under more severe conditions with a potential range of 0.6- 1.4 V, again we registered no marked losses in Pt and Au despite the dissolution of Pd. The results from the Pt monolayer electrocatalysts significantly impact the science of electrocatalysis and fuel-cell technology, as they demonstrated an exceptionally effective way of using Pt that can resolve problems encountered in other approaches.