%0 Journal Article
%T Preparation of Bimetallic Pd-Co Nanoparticles on Graphene Support for Use as Methanol Tolerant Oxygen Reduction Electrocatalysts
%A R. N. Singh
%A C. S. Sharma
%J Engineering, Technology & Applied Science Research
%D 2012
%I 
%X Graphene-supported (40-x) wt% Pd x wt% Co (0¡Üx¡Ü13.33) alloys/composites have been prepared by a microwave-assisted polyol reduction method and been investigated for their structural and electrocatalytic properties for the oxygen reduction reaction (ORR) in 0.5 M H2SO4 at 298 K. The study demonstrated that the bimetallic Pd-Co composite nanoparticles are, in fact, alloy nanoparticles with fcc crystalline structure. Partial substitution of Pd by Co (from 3.64 to 13.33 wt%) in 40 wt% Pd/graphene decreases the lattice parameter as well as the crystallite size and increases the apparent catalytic activity, the latter, however, being the greatest with 8 wt% Co. The ORR activity of the active 32 wt% Pd 8wt% Co is found to be considerably low when it was deposited on the support multiwall carbon nanotubes under similar conditions. The rotating disk electrode study indicated that the ORR on 32 wt% Pd 8 wt% Co/GNS in 0.5 M H2SO4 follows approximately the four-electron pathway.
%K graphene-supported composite
%K oxygen reduction reaction
%K microwave-assisted polyol reduction method
%K electrocatalytic properties
%U http://www.etasr.com/index.php/ETASR/article/download/215/144