A new simple preparation of platinum-nickel alloy nanoparticles and their characterization as an electrocatalyst for methanol oxidation

A new simple preparation of platinum-nickel alloy nanoparticles and their characterization as an... Pt-Ni alloy nanoparticles were produced by casting 2 or 10 mM H2PtCl6 solutions on a Ni column. The apparent particle size for the resultant Pt-Ni alloys increased with the concentration of the H2PtCl6 solution, while the content of Pt in the alloy decreased. The potential sweeps of 5 cycles in an H2SO4 aqueous solution for Pt-Ni (2 mM)/Ni and Pt-Ni (10 mM)/Ni electrodes led to electrochemical behavior similar to a polycrystalline Pt electrode, suggesting the formation of a few thin Pt layers on each Pt-Ni alloy surface. In electrochemical measurements, both Pt-Ni/Ni electrodes showed more negative onset potential of methanol oxidation and slower degradation of oxidation current of methanol than the polycrystalline Pt electrode. X-ray photoelectron spectroscopy of both Pt-Ni/Ni electrodes showed the shift of Pt4f peaks to a higher binding energy, suggesting that the increase in the d vacancy in the balance band 5d orbital of Pt contributed to the improved electrocatalytic activity and durability of the Pt-Ni/Ni electrodes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

A new simple preparation of platinum-nickel alloy nanoparticles and their characterization as an electrocatalyst for methanol oxidation

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Publisher
Springer Journals
Copyright
Copyright © 2006 by VSP
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry; Catalysis
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856706777973754
Publisher site
See Article on Publisher Site

Abstract

Pt-Ni alloy nanoparticles were produced by casting 2 or 10 mM H2PtCl6 solutions on a Ni column. The apparent particle size for the resultant Pt-Ni alloys increased with the concentration of the H2PtCl6 solution, while the content of Pt in the alloy decreased. The potential sweeps of 5 cycles in an H2SO4 aqueous solution for Pt-Ni (2 mM)/Ni and Pt-Ni (10 mM)/Ni electrodes led to electrochemical behavior similar to a polycrystalline Pt electrode, suggesting the formation of a few thin Pt layers on each Pt-Ni alloy surface. In electrochemical measurements, both Pt-Ni/Ni electrodes showed more negative onset potential of methanol oxidation and slower degradation of oxidation current of methanol than the polycrystalline Pt electrode. X-ray photoelectron spectroscopy of both Pt-Ni/Ni electrodes showed the shift of Pt4f peaks to a higher binding energy, suggesting that the increase in the d vacancy in the balance band 5d orbital of Pt contributed to the improved electrocatalytic activity and durability of the Pt-Ni/Ni electrodes.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jan 1, 2006

References

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