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Active Surface Area (active + surface_area)
Selected AbstractsSynthesis of High-Surface-Area Platinum Nanotubes Using a Viral TemplateADVANCED FUNCTIONAL MATERIALS, Issue 8 2010. Górzny, Marcin Abstract A novel method for the synthesis of high-active-surface-area, platinum,tobacco mosaic virus (Pt,TMV) nanotubes is presented. A platinum salt is reduced to its metallic form on the external surface of a rod-shaped TMV by methanol, which serves as a solvent and reductant simultaneously. It was found that for the same Pt loading the Pt,TMV nanotubes had an electrochemically active surface area between 4 to 8 times larger than similarly sized Pt nanoparticles. A Pt,TMV catalyst displays greater stability in acidic conditions than those based on nanoparticles. When used as a catalyst for methanol oxidation, these Pt nanotubes display a 65% increase in catalytic mass activity compared to that based on Pt nanoparticles. [source] Raspberry-like Gold Microspheres: Preparation and Electrochemical Characterization,ADVANCED FUNCTIONAL MATERIALS, Issue 4 2007Z. Li Abstract A straightforward method to synthesize quasi-monodisperse gold microspheres from a commercial gold plating solution is reported. The size and the surface roughness of the obtained particles can easily be tuned. In particular, raspberry-like particles with a high active surface area are obtained. The microspheres are assembled on indium tin oxide (ITO) electrodes using the layer-by-layer technique and the overall electroactive surface area is increased, as characterized by cyclic voltammetry. The as-prepared products were characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), cyclic voltammetry, and light microscopy. [source] Nanoporous Pt-Ru Networks and Their Electrocatalytical Properties,ADVANCED MATERIALS, Issue 18 2007K. Koczkur A one-step, reproducible and controllable method to directly grow nanoporous platinum-ruthenium networks is demonstrated. The synthesized nanoporous PtRu networks not only possess a huge active surface area, but also exhibit superior activity towards the electrochemical oxidation of CO and methanol compared to a bare Pt surface. [source] Polarization curves for an alkaline water electrolysis at a small pin vertical electrode to produce hydrogen,AICHE JOURNAL, Issue 9 2010Ph. Mandin Abstract During two-phase electrolysis for hydrogen production, according with alkaline,water electrolysis process, there are bubbles which are created at electrodes which imply a great hydrodynamic acceleration in the normal earth gravity field and then a quite important electrical properties and electrochemical processes disturbance, for both transport and reaction. This disturbance can lead to the modification of the local current density and to anode effects for example. In this work, a model experimental set-up is studied. The vertical pine electrode of small electro active surface area is surrounded with a large surface counter electrode. The hydrogen production is performed at the working electrode and effort is focused here upon the global electrochemical cell electrical performances. The polarization curves intensity vs. applied voltage are experimentally measured and presented for different factors such as: the electro active species concentration, nature and counter electrode diameter factors. © 2010 American Institute of Chemical Engineers AIChE J, 2010 [source] | ||||||||||