Methods of conditioning direct methanol fuel cells

Details Methods of conditioning direct methanol fuel cells Methods of conditioning direct methanol fuel cells

2005-11-08

2005-11-08

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S006000, C429S047000

Reexamination Certificate

active

06962760

ABSTRACT:
Methods for conditioning the membrane electrode assembly of a direct methanol fuel cell (“DMFC”) are disclosed. In a first method, an electrical current of polarity opposite to that used in a functioning direct methanol fuel cell is passed through the anode surface of the membrane electrode assembly. In a second method, methanol is supplied to an anode surface of the membrane electrode assembly, allowed to cross over the polymer electrolyte membrane of the membrane electrode assembly to a cathode surface of the membrane electrode assembly, and an electrical current of polarity opposite to that in a functioning direct methanol fuel cell is drawn through the membrane electrode assembly, wherein methanol is oxidized at the cathode surface of the membrane electrode assembly while the catalyst on the anode surface is reduced. Surface oxides on the direct methanol fuel cell anode catalyst of the membrane electrode assembly are thereby reduced.

REFERENCES:
patent: 5415888 (1995-05-01), Banerjee
patent: 2004/0185328 (2004-09-01), Lin et al.

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