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Pt Monolayer on Porous Pd−Cu Alloys as Oxygen Reduction Electrocatalysts

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journal contribution
posted on 2010-07-14, 00:00 authored by Minhua Shao, Krista Shoemaker, Amra Peles, Keiichi Kaneko, Lesia Protsailo
We demonstrate the synthesis of a core−shell catalyst consisting of a Pt monolayer as the shell and porous/hollow Pd−Cu alloy nanoparticles as the core. The porous/hollow Pd−Cu nanoparticles were fabricated by selectively dissolving a less noble metal, Cu, using an electrochemical dealloying process. The Pt mass activity for the oxygen reduction reaction of a Pt monolayer deposited on such a porous core is 3.5 times higher than that of a Pt monolayer deposited on bulk Pd nanoparticles and 14 times higher than that of state-of-the-art Pt/C electrocatalysts.