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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
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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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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