Highly dispersed platinum nanoparticles on carbon nanocoils and their electrocatalytic performance for fuel cell reactions |
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Authors: | M Sevilla T Valdés-Solís AB Fuertes |
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Affiliation: | a Instituto Nacional del Carbón (CSIC), P.O. Box 73, 33080 Oviedo, Spain b Departamento de Química Física e Instituto Universitario de Materiales, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain |
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Abstract: | Highly graphitic carbon nanocoils (GCNC) were synthesized through the catalytic graphitization of carbon microspheres obtained by the hydrothermal carbonization of different saccharides (sucrose, glucose and starch) and were used as a support for Pt nanoparticles. The Pt nanoparticles were deposited by means of a polymer mediated-polyol method. The Pt catalysts were characterized both physically (XRD, TEM, HRTEM and XPS) and electrochemically (electrooxidation of methanol in an acid medium). The electrocatalysts thus prepared show a high dispersion of Pt nanoparticles, with diameters in the 3.0-3.3 nm range and a very narrow particle size distribution. These catalytic systems possess high electroactive Pt surface areas (up to 85 m2 g−1 Pt) and they exhibit large catalytic activities towards methanol electrooxidation (up to 201 A g−1 Pt). Moreover, they have a high resistance against oxidation, which is considerably greater than that of the Pt/Vulcan system. |
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Keywords: | Carbon nanostructures Pt nanoparticles Electrocatalyst Methanol electrooxidation Voltammetry |
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