Comparison between graphene supported Pt hollow nanospheres and graphene supported Pt solid nanoparticles for hydrogen evolution reaction

Platinum hollow nanospheres are synthesized by Co nanoparticles as sacrificial template and then immobilized on graphene nanosheets (HNPt/G). The as-prepared nanostructure is characterized by TEM (transmission electron microscopy) and EDX (energy dispersion X-ray spectroscopy). The prepared HNPt/G is used as electrocatalyst for HER (hydrogen evolution reaction). For this purpose, GC (glassy carbon) electrode modified by HNPt/G was fabricated (HNPt/G/GC). Electrochemical studies show that HNPt/G has a good electrocatalytic activity toward HER. For comparison solid Pt nanoparticles were synthesized and decorated on graphene (NPt/G). The HNPt/G exhibit an enhanced electrocatalytic performance for HER compared with NPt/G.