Electro-deposition on carbon black and carbon nanotubes of Pt nanostructured catalysts for methanol oxidation

TitleElectro-deposition on carbon black and carbon nanotubes of Pt nanostructured catalysts for methanol oxidation
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2008
AuthorsPaoletti, C., Cemmi A., Giorgi L., Giorgi R., Pilloni L., Serra Emanuele, and Pasquali M.
JournalJournal of Power Sources
Keywords(1 1 0) surface, Acid solutions, Bioelectric phenomena, carbon, Carbon black, Carbon nanotubes, Catalysis, Catalyst activity, Catalysts, Catalytic oxidation, Catalytic performances, Chemical analysis, Chemical oxygen demand, Chemical reductions, Copper plating, Cyclic voltammetry, Deposits, Diffusion in gases, Direct energy conversion, Electric batteries, Electric fields, Electro chemical method, Electro-catalysts, Electrochemical electrodes, Electrochemical features, Electrochemical oxidation, Electrode positioning, Electrode surfaces, Electrolysis, Electrolytic reduction, Electromagnetic field theory, Electromagnetic Fields, electromagnetism, Elsevier (CO), Field emission, Field-emission gun (FEG), Fuel cells, galvanostatic, Gas Diffusion Electrodes (GDL), Hydrogen, Inorganic acids, Lithography, Loading, Magnetism, Metallizing, Methanol, methanol oxidation, Methanol oxidation reaction (MOR), Nano-morphology, Nano-structured catalyst, Nanocomposites, Nanoparticles, Nanopores, Nanostructured materials, Nanostructures, nanotechnology, Nanotubes, oxidation, Platinum, Polymer electrolyte fuel cells (PEFCs), Pt loadings, Pt nano-particles, Scanning, Specific activity, Sulphuric acid (SA), surface carbon, Surface diffusion, Surface reactions, Voltammetry

An electrochemical method for the Pt nanoparticles deposition on porous and high surface carbon substrates (carbon black and carbon nanotubes), as an alternative way to prepare gas diffusion electrodes for polymer electrolyte fuel cells (PEFCs), is herein described. Pt nanoparticles well distributed and localized on the electrode surface were obtained by using an electric field. The electro-catalysts were prepared by single and multiple pulse galvanostatic polarizations in 1 M sulphuric acid + 5 mM exachloroplatinic acid solution. Chemical analysis, cyclic voltammetry and field emission gun scanning electron microscopy were used to determine the electrochemical features of Pt deposits and the influence of electro-deposition method on their nano-morphology. Electro-catalytic performances were studied by investigating the methanol oxidation reaction and the results are presented in form of surface specific activity and mass specific activity to take into account the electrochemical real surface and Pt loading. A comparison with commercial E-TEK Pt/C catalysts, prepared by traditional chemical reduction and heat treatment in hydrogen, shows that the electrodeposited catalyst presents higher activity at lower Pt loading. © 2008 Elsevier B.V. All rights reserved.


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