Highly active Pt nanoparticles on nickel phthalocyanine functionalized graphene nanosheets for methanol electrooxidation

A novel electrocatalyst using nickel (II) phthalocyanine-tetrasulfonic acid tetrasodium salt (TSNiPc) functionalized graphene (TSNiPc-graphene) composite as catalyst support for Pt nanoparticles is reported. The surface morphology, composition and structure of the prepared nanocomposites as well as their electrocatalytic properties toward methanol oxidation are characterized by UV-vis absorption spectroscopy, Raman spectroscopy, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical tests. Pt nanoparticles are found uniformly dispersed on the surface of TSNiPc-graphene composite, with the small particle size of about 3.1 nm. Studies of cyclic voltammetry and chronoamperometry demonstrate that the Pt/TSNiPc-graphene exhibits much higher electrocatalytic activity and stability than the Pt/graphene catalyst for methanol oxidation.