Electrochemical analysis of polyethylenimine-modified graphene oxide supports for Pt nanoparticles catalyst electrode.

Polyethylenimine-modified graphene oxide supported platinum electro-catalyst was synthesized by a modified sodium borohydride reduction method. As a modifier agent, polyethylenimine (PEI) was used to form coating layer onto graphene surface. To ascertain the electrochemical behavior, PEI-reduced graphene oxide (PEI-RGO) was compared with changing the PEI/RGO weight ratio of 1:0.5, 1:1 and 1:2, respectively. The morphology of electro-catalysts was observed by transmission electron microscope (TEM) and scanning electron microscope (SEM) images. In addition, lattice parameters and particle size of electro-catalysts were measured by X-ray diffraction (XRD). FT-IR spectra of catalysts were used to ascertain existence and functional group of the PEI branches on GO surface.