We prepared a Pt/C catalyst for use in proton exchange membrane fuel cells (PEMFCs) by pulse-microwave assisted chemical reduction synthesis. The microstructure and morphology of the as-prepared catalyst was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The catalyst's electrocatalytic performance in the oxygen reduction reaction (ORR) was measured by cyclic voltammetry (CV), linear sweep voltammetry (LSV), and constant potential polarization. The results indicate that pulse-microwave assisted chemical reduction synthesis is an efficient method to prepare PEMFC catalysts and that the pH and the microwave power largely influence the size and dispersion of Pt nanoparticles. At pH 10 and at a microwave power of 2 kW, the Pt nanoparticles were found to be uniform in size and the Pt nanoparticles size ranged between 1.3 and 2.4 nm with an average size of 1.8 nm. Additionally, the Pt nanoparticles were found to be highly dispersed on the surface of the carbon support. The electrochemical measurements showed that the electrochemical surface area (ESA)
Pt-Fe/C catalyst for proton exchange membrane fuel cell (PEMFC) was prepared by a pulse-microwave assisted chemical reduction heat-treatment synthesis method. The elemental content was tested by inductively coupled plasma (ICP). The microstructure and morphology of the as-prepared catalyst were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The electrocatalytic performance was measured by cyclic voltammetry (CV). The results indicate that pulse-microwave assisted chemical reduction heat-treatment synthesis is an efficient method for preparing PEMFC catalysts while the temperature and time of heat treatment greatly affect the size and activity of the Pt-Fe nanoparticles. For a heating temperature of 500°C and a time of 3 h the Pt-Fe nanoparticles were uniform in size. Moreover, the Pt-Fe/C-500-3h alloy catalyst was highly dispersed on the surface of the carbon support and the TEM and XRD showed that the average Pt-Fe nanoparticle size was 1.8 nm. The electrochemical measurements show that the electrochemical surface area (ESA) of the catalyst was 55.14 m 2 •g -1 .
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