Faceted platinum nanocrystals supported on carbon nanotubes were prepared using NO2- as a crucial shape-controlling agent. The composites exhibit high electrochemical catalytic activity for oxygen reduction facilitated by the cooperation between the Pt{111} facets and atomic steps, and extremely high selectivity for the oxidation of glycerol to glyceraldehyde.

Tungsten trioxide microspheres of 2–4 m diameter have been prepared by controlled oxidation of tungsten carbide microspheres. These microspheres are characterized by XRD, SEM, and HRTEM. The microspheres are made of WO3 nanoparticles with an average diameter of around 15 nm. Platinum supported on these WO3 microspheres exhibits higher and stable electrocatalytic activity for methanol oxidation ...

The role of partially fluorinated carbon (CFx) supported platinum nanoparticles as proton exchange membrane fuel cell (PEMFC) electrodes in a hydrogen is investigated. CFx employed catalyst support via impregnation for oxygen reduction reaction (ORR) at various loadings to determine the optimal loading ORR and compared widely used (non-fluorinated) Vulcan Carbon (XC-72R). In half-cell testing, ...

Worldwide usage of platinum group metals is increasing, prompting new recovery technologies. Resting cells of Desulfovibrio desulfuricans reduced soluble Pd2+ to elemental, cell-bound Pd0 supported by pyruvate, formate, or H2 as the electron donor without biochemical cofactors. Pd reduction was O2 insensitive, opening the way for recycling and recovery of Pd under oxic conditions.

Stable and metastable metallic nanoparticles exhibit unique properties compared to the bulk, with potentially important applications for catalysis. This is in particular case AgPt alloy that can ordered L1$_1$ structure (alternation of pure Ag Pt (111) planes) nanometer size particles. However, such small systems, interfaces play an role. Therefore, support used elaborate ultrahigh vacuum exper...