Electrochemical Characterization of Shape-Controlled Pt Nanoparticles in Different Supporting Electrolytes

• DOI: 10.1021/cs200681x
• Publication Date: 2012-04-16T14:21:53Z
• Authors: Francisco J. Vida...; Rosa M. Arán-Ais; José Solla-Gullón; Enrique Herrero; Juan M. Feliu
• Keywords: Perchloric acid; Surface charge; Platinum nanoparticles; Crystal (programming language)

The voltammetric profile of preferentially shaped platinum nanoparticles has been used to analyze the different sites present on surface. For first time, this analysis made in NaOH solutions and revisited sulfuric perchloric acid media. comparison with profiles model surfaces, that is, single-crystal electrodes, allows assigning signals appearing voltammograms nanoparticle specific A good correlation between shape determined by TEM is obtained. characterized alkaline media, adsorbed species surface have characterized, three major regions can be identified. Below 0.2 V, contribution due hydrogen adsorption, whereas above 0.6 OH main Between those values, are competitive adsorption/desorption process OH/H. New criteria for determining active area proposed. In medium, total charge density measured 0.06 0.90 V stands 390 μC cm–2. areas perfect agreement Once behavior toward CO oxidation analyzed compared observed electrodes.