Chemija / Chemistry
 ISSN 0235-7216 ISSN 2424-4538 (online) |
2016 m. Nr. 3 Microwave-assisted synthesis of platinum-tungsten/graphene catalysts
In this study a rapid microwave heating method was used to prepare the graphene
supported platinum–tungsten catalysts with different Pt:W molar ratios (denoted as PtW/GR). Transmission Electron Microscopy and Inductively Coupled Plasma Optical Emission Spectroscopy were used for the characterization of prepared catalysts. The electrocatalytic activity of the PtW/GR catalysts with respect to the oxidation of borohydride in an alkaline medium was investigated by means of cyclic voltammetry and chrono-techniques. It has been determined that the graphene supported platinum–tungsten catalysts with the Pt:W molar ratios equal to 1.6:1, 2.3:1 and 7.1:1 were prepared. The prepared PtW/GR catalysts with different Pt:W molar ratios show an enhanced electrocatalytic activity towards the oxidation of H2 generated by catalytic hydrolysis of BH4 – and direct oxidation of BH4 – compared with the bare Pt/GR and W/GR catalysts. : Keywords: platinum, tungsten, graphene, sodium borohydride, oxidation |
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