Method for generating a shell of noble metal overlaid on a...

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide

Reexamination Certificate

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C502S325000, C502S339000, C502S344000, C502S347000, C502S317000, C502S326000

Reexamination Certificate

active

08058204

ABSTRACT:
An electrocatalyst is described. The electrocatalyst includes a core of a non-noble metal or non-noble metal alloy; and a continuous shell of a noble metal or noble metal alloy on the core, the continuous shell being at least two monolayers of the noble metal or noble metal alloy. Methods for making the electrocatalyst are also described.

REFERENCES:
patent: 7053021 (2006-05-01), Zhong et al.
patent: 2006/0039857 (2006-02-01), Adcock
patent: 1358596 (2002-07-01), None
patent: 2005-240088 (2005-09-01), None
patent: 99/07502 (1999-02-01), None
Zhang, J., Platinum Monolayer on Nonnoble Metal-Noble Metal Core-Shell Nanoparticle Electrocatalysts for O2 Reduction, The Journal of Physical Chemistry, 2005, 109, pp. 22701-22704, published on Web Nov. 11, 2005.
Szu-Han Wu et al., “Synthesis and Characterization of Nickel Nanoparticles by Hydrazine Reduction in Ethylene Glycol”, Science Direct, Academic Press, Journal of Colloid and Interface Science, pp. 282-286, 2003.
Dan V. Goia, “Preparation and Formation Mechanisms of Uniform Metallic Particles in Homogeneous Solutions”, Journal of Materials Chemistry, pp. 451-458, 2004.
P. Saravanan et al., “Submicron Particles of Co, Ni and Co-Ni Alloys”, Bulletin of Materials Science, vol. 24, No. 5, pp. 515-521, Oct. 2001.
Zhang, et al., Platinum Monolayer on Nonnoble Metal—Noble Metal Core—Shell Nanoparticle Electrocatalysts for O2 Reduction, 2005 American Chemical Society, Publication Date Nov. 11, 2005, 5 pages.

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