Abstract
The electrochemical reduction of oxygen on palladium nanoparticles supported on 3D-Graphene nanosheets was investigated in alkaline media. The Pd nanoparticles were synthesized using a surfactant-free soft alcohol reduction method (SARM). The 3D-Graphene sheets were given a porous morphology using sacrificial silica templates. Scanning and Transmission electron micrographs showed that Pd nanoparticles of an average size of ~5-6 nm were evenly dispersed on porous 3D-Graphene sheets. Rotating ring disc electrode (RRDE) measurements showed significantly enhanced activity of Pd/3D-Graphene catalysts (4-electron oxygen reductions pathway) compared to Pd/Vulcan. The remarkable performance of the Pd/3D-Graphene catalysts was attributed to their (i) higher degree of graphitization providing efficient charge transfer ability, (ii) good dispersion of nanoparticle (iii) porous network of channels embedded into the 3D-graphene matrix using a sacrificial support method (SSM).
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