Pt monolayer on porous Pd-Cu alloys as oxygen reduction electrocatalysts.
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.
Shao
Minhua
M
UTC Power, South Windsor, Connecticut 06074, USA. minhua.shao@utcpower.com
Shoemaker
Krista
K
Peles
Amra
A
Kaneko
Keiichi
K
Protsailo
Lesia
L
D000497:Alloys / Q000737:chemistry*; D002384:Catalysis; D003300:Copper; D055664:Electrochemical Techniques / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010165:Palladium; D010984:Platinum; D016062:Porosity
D000497:Alloys; D010984:Platinum; D010165:Palladium; D003300:Copper