Activation of nanoparticle Pt-Ru fuel cell catalysts by heat treatment: A (super 195) Pt NMR and electrochemical study

Article Abstract:

(super 195)Pt NMR spectroscopic and electrochemical measurements are carried out on commercial Pt-Ru alloy nanoparticle samples to investigate the effect of high temperature annealing in different vacuum/gas-phase environments. The results suggest that optimizing the amount of surface Ru by heat treatment at temperatures near 200 degree Celsius, in a hydrogen atmosphere, is utilized to produce Pt-Ru alloy nanoparticles with high methanol oxidation activity.

Science & research, Research, Analysis, Nuclear magnetic resonance, Thermal properties, Alloys, Nanoparticles

---

Electronic alterations caused by ruthenium in Pt-Ru alloy nanoparticles as revealed by electrochemical NMR

Article Abstract:

A series of (super 195)Pt and (super 13)C NMR spectroscopic and electrochemical experiments on commercial Pt-Ru alloy nanoparticles is carried out and the results are compared with those on Pt-black samples having similar particle sizes. An analysis of the (super 13)C spin-lattice relaxation results indicates that Ru addition causes a reduction in the Fermi level local density of states of the clean metal surface atoms and the 2pi orbital of adsorbed CO.

Electrical & Electronic Equip, Electrical Equipment, Appliance, and Component Manufacturing, Usage, Nuclear magnetic resonance spectroscopy, Electronic equipment and supplies, Electronic equipment

---

Promotion of the electrochemical activity of a bimetallic platinum-ruthenium catalyst by oxidation-induced segregation

Article Abstract:

The incipient wetness impregnation technique is used for the formulation of a bimetallic PtRu/C catalyst and the catalytic activity of the alloy catalyst for electro-oxidation of methanol is investigated by cyclic voltammetry. It was observed that extensive oxidation treatment at elevated temperatures of [T.sub.0] > 600 K, caused deactivation of the electroactivity, which should be the result of excessive oxidation of the carbon support.

Platinum compounds

Similar abstracts:

• Abstracts: Size-controlled synthesis of gold nanoparticles from bulk gold substrates by sonoelectrochemical methods. Semiconductor-metal nanocomposites. Photoinduced fusion and photocatalysis of gold-capped TiO2(TiO2/Gold)
• Abstracts: Screening the reactivity of PtxRuyMoz catalysts toward the hydrogen oxidation reaction with the scanning electrochemical microscope
• Abstracts: Carbon nanotubes functionalized by N[O.sub.2]: Coexistence of charge transfer and radical transfer. Chemisorption of NO2 on carbon nanotubes
• Abstracts: Solvation dynamics at the water/zirconia interface: Molecular dynamics simulations. Electron-stimulated desorption of H(super +), H(sub 2)(super +), OH(super +), and H(super +)(H2O)(sub n) from water-covered zirconia surfaces
• Abstracts: Silicon surface passivation by organic mololayers: minority charge carrier lifetime measurements and Kelvin probe investigations

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.