Platinum-impregnated hydrous tin oxide catalysts

Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or... – Electrode structure or composition

Reexamination Certificate

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C429S525000, C429S527000, C429S528000, C429S530000

Reexamination Certificate

active

07897293

ABSTRACT:
A chemical composition is provided having the formula:in-line-formulae description="In-line Formulae" end="lead"?M—SnOx.yH2Oin-line-formulae description="In-line Formulae" end="tail"?M is a platinum group metal and x and y are positive numbers. The hydrous platinum tin oxide may be used in the cathode of a fuel cell as a catalyst for oxygen reduction.

REFERENCES:
patent: 5922487 (1999-07-01), Watanabe et al.
Hawley's Condensed Chemical Dictionary, 11thedition, pp. 611 and 349-350, 1987.
Gardner et al, “Characterization Study of Silica-Supported Platinized Tin Oxide Catalysts Used for Low-Temperature CO Oxidation: Effect of Pretreatment Temperature”, The Journal of Physical Chemistry, 1991, pp. 835-838, vol. 95, No. 2. American Chemical Society.
Katayama et al, “Electrooxidation of Methanol on a Platinum-Tin Oxide Catalyst”, The Journal of Physical Chemistry, 1980, pp. 376-381, vol. 84, No. 4, American Chemical Society.
Ugarte et al, “Low-Platinum Tin-Oxide Electrocatalyst for Pem Fuel Cell Cathodes”, 202nd Electrochemical Society Meeting, Oct. 20-25, 2002, Salt Lake City.
Ugarte et al, “Low-Platinum Tin-Oxide Electrocatalyst for Pem Fuel Cell Cathodes”, 202nd Electrochemical Society Meeting, Oct. 20-25, 2002, Salt Lake City, UT.
Swider-Lyons et al, “Low-Platinum Hydrous Metal Oxides for PEMFC Cathodes”, NRL DOE review, May 19, 2003, pp. 1-5.
Watanabe et al., “Preparation of Dispersed Platinum on Conductive Tin Oxide and Its Catalytic Activity for Oxygen Reduction,” J. Electrochem. Soc., 130(1). (Jan. 1983).

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