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Green synthesis of Pt nanoparticles and their application in the oxygen reduction reaction

机译：Green synthesis of Pt nanoparticles and their application in the oxygen reduction reaction

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Abstract The green synthesis of platinum nanoparticles between 3 and 7 nm was achieved using an aqueous extract, and then supported on high surface area carbon obtained from the pyrolysis of the same natural source, which is finally used as an electrocatalyst for the oxygen reduction reaction (ORR). The green synthesis is achieved by using a Sargassum sp. extract with a PtCl4 solution, which is confirmed through a UV–vis analysis. The electrocatalysts obtained are characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM). The electrochemical characterization is determined in acidic media. The PtNPs (5% w/w) supported on commercial carbon Vulcan showed an excellent electrocatalytic activity up to 6.3 mA cm−2 (at 0.2 V vs. RHE), in comparison to the commercial catalyst Pt-Vulcan. Finally, the PtNPs supported on the Sargassum sp. carbon-based sample improve the kinetics of the ORR as it increases the amount of PtNPs loading.Graphic abstract

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