Preparation of Pt hollow nanoparticles using Ag as the template and electrocatalytic performance for methanol oxidation

Ag nanoparticles with two different particle sizes and uniform size-distribution were prepared at18 ℃ by adjusting the adding amount of the NaOH solution,using silver nitrate as the precursor,polyvinylpyrrolidone( PVP) as the surfactant,ascorbic acid( AA) as the reductant. Pt hollow( Pthollow) nanospheres with different shell thicknesses and modified glassy carbon( GC) electrode( Pthollow/GC) were synthesized by adjusting the amount of precursor H2PtCl6·6H2O at room temperature,using Ag colloids as the template.The morphology,composition and structure of Pthollowwere characterized by scanning electron microscopy( SEM),high resolution transmission electron microscopy( HRTEM),energy-dispersive X-ray spectroscopy( EDS),X-ray diffraction( XRD) and other detection techniques; the electrocatalytic oxidation activity of Pthollow/GC,Pt solid nanoparticle modified GC( Ptnano/GC) electrode were studied and compared using methanol as a probe molecule. The results show that the Pthollownanospheres have a uniform particle size and good dispersity,and the electrocatalytic oxidation activity of Pthollow/GC for methanol is significantly higher than that of Ptnano/GC electrode.