Chemistry: electrical current producing apparatus – product – and – Having earth feature
Reexamination Certificate
2005-08-30
2005-08-30
Stinson, Frankie L. (Department: 1746)
Chemistry: electrical current producing apparatus, product, and
Having earth feature
C429S047000, C429S218100
Reexamination Certificate
active
06936370
ABSTRACT:
In a solid polymer fuel cell series, various circumstances can result in the fuel cell being driven into voltage reversal. For instance, cell voltage reversal can occur if that cell receives an inadequate supply of fuel (for example, fuel starvation). In order to pass current during fuel starvation, reactions other than fuel oxidation may take place at the fuel cell anode, including water electrolysis and oxidation of anode components. The latter may result in significant degradation of the anode. Such fuel cells can be made more tolerant to cell reversal by promoting water electrolysis over anode component oxidation at the anode. This can be accomplished by incorporating a catalyst composition at the anode to promote the water electrolysis reaction, in addition to the typical anode electrocatalyst for promoting fuel oxidation.
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Campbell Stephen A.
Gascoyne John M.
Knights Shanna D.
Ralph Thomas R.
Taylor Jared L.
Ballard Power Systems Inc.
Johnson Matthey Public Limited Company
McAndrews Held & Malloy Ltd.
Stinson Frankie L.
Wills Monique
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