Induced electronic modification of Pt nanoparticles deposited onto graphitic domains of carbon materials by UV irradiation

International audiencePlatinum nanoparticles deposited either by the photodeposition method or by the carbonyl chemical route are thought to be electronically modified onto carbon support. The deposition method is responsible for a controlled heterogeneous nucleation of platinum nanoparticles onto the substrate. By coupling results obtained from CO stripping experiments and X-ray photoelectron spectroscopy (XPS), there was a strong interaction between graphitic domains of carbonaceous supports and platinum nanoparticles. This phenomenon is at the origin of an increase of CO tolerance of the catalyst

Spectroelectrochemical Probing of the Strong Interaction between Platinum Nanoparticles and Graphitic Domains of Carbon

International audienc

Enhancement of activity of PtRu nanoparticles towards oxidation of ethanol by supporting on poly(diallydimethylammonium)-functionalized carbon nanotubes and modification with phosphomolybdate

A new concept of fabrication, immobilization, and distribution of bimetallic PtRu nanoparticles leading to enhancement of the electrocatalytic oxidation of ethanol is proposed. The approach utilizes poly diallyldimethylammonium chloride , PDDA, to functionalize multi walled carbon nanotubes MWCNTs and to produce a novel support for synthesized PtRu nanoparticles as well as further modification of the catalytic surfaces with ultra thin layers of phosphododecamolybdate PMo12O40 3 amp; 8722; . Remarkable increases of electrocatalytic currents measured under voltammetric and chronoamperometric conditions have been observed. Parallel experiments performed with use of commercial PtRu nanoparticles confirm existence of enhancement effects originating from application of PDDA modified MWCNTs and phosphomolybdat