In Polymer Electrolyte Fuel Cells (PEFCs) Gas Diffusion Electrodes (GDE) are used. These electrodes traditionally consist of catalyst nanoparticles (Pt or alloys as Pt-Ru) deposited on porous and high surface carbon substrates. In this work we describe a new electrodeposition method: applying an electric field to deposit catalyst on different carbon supports, we obtain a good Pt nanoparticles distribution localized in reaction sites. Chemical analysis, cyclic voltammetry (CV) and FEG-SEM technique are used to determine electrochemical characteristics of Pt deposit and the influence of electrodeposition method on the nano-morphology. Electrocatalytic performances were carried out by oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) in H2SO4, re-calculating data in the form of mass specific activity (MSA) and surface specific activity (SSA) to take in account the real electrochemical surface of Pt loading. A comparison with commercial Pt/C catalysts shows an higher activity, at lower Pt loading, for our materials.
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|Titolo:||Development and characterisation of electrocatalysts for polymer electrolyte fuel cells|
|Data di pubblicazione:||2005|
|Appartiene alla tipologia:||02a Capitolo o Articolo|