Abstract
Chalcogenides Pt-based materials have been explored due to their potential use in Proton Exchange Membrane Fuel Cells (PEMFCs). This paper presents mixed platinum tungsten sulfide nanocrystals (PtxWySz) prepared by thermal treatment as a new cathodic electrocatalyst for Oxygen Reduction Reaction (ORR). Physical characterization and electrochemical evaluation of two different metallic proportions (1:4 and 1:6 wt/wt of (NH4)2PtCl6 and NH4WS4 salts precursors) show that W-S provide higher activity for ORR and high poison tolerance to CO adsorption, at lower Pt loading. Thermogravimetric analysis (TGA), SEM-EDS, and ICP results are presented and match each other. XRD patterns present characteristic peaks of Pt, WO3, and PtW phases. TEM images confirm the morphology and nanoparticle size of PtxWySz. It was found a more positive onset potential and larger electrochemical surface area for the PtxWySz compared to Pt/C.
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