|Title||Platinum-gold nanoclusters as catalyst for direct methanol fuel cells|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2011|
|Authors||Giorgi, L., Giorgi R., Gagliardi S., Serra Emanuele, Alvisi Marco, Signore M.A., and Piscopiello E.|
|Journal||Journal of Nanoscience and Nanotechnology|
|Keywords||Alloy nanoparticle, Carbon support, Commercial catalyst, Cyclic voltammetry, Deposition by sputtering, Deposition technique, Direct methanol fuel cells (DMFC), Dispersed metals, Electrocatalysts, Electrocatalytic performance, Electrochemical active surface, Gas diffusion electrodes, Island growth mode, Mean size, Methanol, Methanol oxidation reactions, Nano-sized, Nanomorphologies, Nanoparticles, Platinum, Platinum compounds, Porous surface, Specific activity, Sputtering, Uniform distribution|
Nanosized platinum-gold alloys clusters have been deposited on gas diffusion electrode by sputter deposition. The deposits were characterized by FE-SEM, TEM and XPS in order to verify the formation of alloy nanoparticles and to study the influence of deposition technique on the nanomorphology. The deposition by sputtering process allowed a uniform distribution of metal particles on porous surface of carbon supports. Typical island growth mode was observed with the formation of a dispersed metal nanoclusters (mean size about 5 nm). Cyclic voltammetry was used to determine the electrochemical active surface and the electrocatalytic performance of the PtAu electrocatalysts for methanol oxidation reaction. The data were re-calculated in the form of mass specific activity (MSA). The sputter-catalyzed electrodes showed higher performance and stability compared to commercial catalysts. Copyright © 2011 American Scientific Publishers. All rights reserved.
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