Electrochemical Characterization of Clean Shape-Controlled Pt Nanoparticles Prepared in Presence of Oleylamine/Oleic Acid

A collection of shape-controlled Pt nanoparticles has been prepared using two different and previously described methodologies, both using oleylamine/oleic acid as capping material/solvent. A new decontamination protocol is presented to effectively clean the surface of the different nanoparticles thus allowing a full exposure of their surface area and consequently to make the most of their surface structure dependent reactivity. Subsequently, the clean shape-controlled Pt nanoparticles have been electrochemically characterized and their electrocatalytic properties evaluated towards some surface structure reactions of interest. The results indicate that the full characterization of the surface structure cannot be done exclusively by the available microscopy techniques, since it is very difficult to determine the presence of surface defects. Additional surface characterization probes, such as those provided by electrochemical surface sensitive reactions, have been used to assess the surface structure of the samples.This work has been financially supported by the MICINN (Feder) of Spain and Generalitat Valencia through Projects CTQ2013-44083-P and PROMETEOII/2014/013, respectively

Cathodic Corrosion: A Quick, Clean, and Versatile Method for the Synthesis of Metallic Nanoparticles**

A simple and effective method for the synthesis of nanoparticles is reported based on extreme cathodic polarization of a metal, formation of cation-stabilized metal anions, and their agglomeration (see picture). The improved catalytic activity of these nanoparticles in the oxidation of carbon monoxide as well as methanol is shown using platinum.<br/

Electrocatalytic enhancement of formic acid oxidation reaction by acetonitrile on well-defined platinum surfaces

Catalysis and Surface Chemistr

Metal Deposition for Surface Characterization of Pt Nanoparticles

Abstract not Available.</jats:p

Mimicking the Microbial Oxidation of Elemental Sulfur with a Biphasic Electrochemical Cell

&lt;p&gt;The lack of an artificial system that mimics elemental sulfur (S&lt;sub&gt;8&lt;/sub&gt;) oxidation by microorganisms inhibits a deep mechanistic understanding of the sulfur cycle in the biosphere and the metabolism of sulfur-oxidizing microorganisms. In this article, we present a biphasic system that mimics biochemical sulfur oxidation under ambient conditions using a liquid|liquid (L|L) electrochemical cell and gold nanoparticles (AuNPs) as an interfacial catalyst. The interface between two solvents of very different polarity is an ideal environment to oxidise S&lt;sub&gt;8&lt;/sub&gt;, overcoming the &lt;a&gt;incompatible solubilities &lt;/a&gt;of the hydrophobic reactants (O&lt;sub&gt;2&lt;/sub&gt; and S&lt;sub&gt;8&lt;/sub&gt;) and hydrophilic products (H&lt;sup&gt;+&lt;/sup&gt;, SO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;2–&lt;/sup&gt;, SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2–&lt;/sup&gt;, &lt;i&gt;etc.&lt;/i&gt;). The interfacial AuNPs provide a catalytic surface onto which O&lt;sub&gt;2&lt;/sub&gt; and S&lt;sub&gt;8&lt;/sub&gt; can adsorb. Control over the driving force for the reaction is provided by polarizing the L|L interface externally and tuning the Fermi level of the interfacial AuNPs by the adsorption of aqueous anions.&lt;/p&gt;</jats:p

Mimicking the Microbial Oxidation of Elemental Sulfur with a Biphasic Electrochemical Cell

The lack of an artificial system that mimics elemental sulfur (S8) oxidation by microorganisms inhibits a deep mechanistic understanding of the sulfur cycle in the biosphere and the metabolism of sulfur-oxidizing microorganisms. In this article, we present a biphasic system that mimics biochemical sulfur oxidation under ambient conditions using a liquid|liquid (L|L) electrochemical cell and gold nanoparticles (AuNPs) as an interfacial catalyst. The interface between two solvents of very different polarity is an ideal environment to oxidise S8, overcoming the incompatible solubilities of the hydrophobic reactants (O2 and S8) and hydrophilic products (H+, SO32–, SO42–, etc.). The interfacial AuNPs provide a catalytic surface onto which O2 and S8 can adsorb. Control over the driving force for the reaction is provided by polarizing the L|L interface externally and tuning the Fermi level of the interfacial AuNPs by the adsorption of aqueous anions.</p

Electrochemical Characterization of Pt Nanoparticles Supported on SWNTs

Abstract not Available.</jats:p