Additives to the gas supply of fuel cells with circulating...

Details Additives to the gas supply of fuel cells with circulating... Additives to the gas supply of fuel cells with circulating...

2006-10-31

2006-10-31

Ruthkosky, Mark (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S010000

Reexamination Certificate

active

07128990

ABSTRACT:
In a gas diffusion electrode the electrolyte must penetrate the pares of the electrode structure to a certain extent to establish the optimum interface between gas and liquid electrolyte, but it should not reach the gas-side of the electrodes. The best equilibrium of the so-called three phase zone (porous current collector-reaction gas-liquid electrolyte) is achieved by adequate wetproofing the porous structure with a polymeric substance as repellency agent. The polymeric substance serves also as a binder. During operation of the electrodes, the wetproofing material may lose its hydrophobicity for various reasons and the result is a penetration into the pores structures, reducing the interface between liquid and gas, notice by a loss of performance. By adding small amounts of wetproofing agents to the gases supplied to the electrodes, the original three-phase condition is maintained, or, if it is already partially degenerated, means and methods for its re-establishment are described. The invention claims substances and techniques for such maintenance and regeneration processes.

REFERENCES:
patent: 4457986 (1984-07-01), Bindra et al.
patent: 5108849 (1992-04-01), Watkins et al.
patent: 5532071 (1996-07-01), Pal et al.
patent: 5599638 (1997-02-01), Surampudi et al.
patent: 6045933 (2000-04-01), Okamoto
patent: WO 2001/00524 (2001-01-01), None

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