Abstract
In this study, in order to extend the application of the HPAs in fuel cells, we modify HPW on the Pt nanospheres catalyst and obtain the HPW-Pt/PAMAM composite catalyst. The catalysts are characterized by scanning electron microscope (SEM), atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS). The electrochemical properties are investigated by cyclic voltammetry (CV) and chronoamperometry (CA). The hydrogen underpotential (Hupd )f ormation/stripping is used to estimate the electrochemically active surface areas, and the oxidation current density during the anodic scan in the CV curves is taken to evaluate the catalytic activity. Experimental Chemicals and instruments.— Chloroplatinic acid hydrate (H2PtCl6 ·6H2O purity >98.5%), Polyamidoamine (PAMAM) and phosphotungstic acid (HPW) are purchased from Sigma-Aldrich. Sulfuric acid (H2SO4 purity about 95.5%) and hydrochloric acid (HCl purity about 36.5%) are analytical reagents. Ultrapure water (18.2 M� ) is used both for dilution of the precursor solution and washing. Scanning electron microscopy (SEM) images with an accelerating voltage of 5 kV are obtained on PHILIP XL-30 ESEM. 2D GIXD and tapping mode AFM (TM-AFM) were employed to observe the morphology and the roughness of the catalysts. X-ray photoelectron spectroscopy (XPS) measurements are conducted with
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