Method for deposition of a catalyst

Details Method for deposition of a catalyst Method for deposition of a catalyst

2005-01-25

2005-01-25

Talbot, Brian K. (Department: 1762)

Coating processes

Electrical product produced

Fuel cell part

C501S101000

Reexamination Certificate

active

06846510

ABSTRACT:
The invention relates to a method for deposition of a catalyst, in particular a method for coating a membrane electrode unit (MEA) for a fuel cell. Said method requires no external electrical field as usual for conventional galvanic techniques. The support for the catalytic layer is first capacitively charged (pseudocapacitance). When brought into contact with an electrolyte solution, comprising the catalyst in the form of dissolved metal salt ions, an in-situ reduction (deposition) of the metal salt ions to give metallic catalyst occurs at the site of contact.

REFERENCES:
patent: 3296102 (1967-01-01), Worsham et al.
patent: 4186110 (1980-01-01), Jalan et al.
patent: 4407905 (1983-10-01), Takeuchi et al.
patent: 5767036 (1998-06-01), Freund et al.
patent: 6277261 (2001-08-01), Divisek et al.
patent: 01307445 (1989-12-01), None
patent: WO 9913128 (1999-03-01), None
New Preparation Technique and Characterisation . . . by Löffler et al. (Scripta mater. 44(2001).
“Ein Neues Verfahren Zur Kupferätzung . . . ” by W. Faul et al. (Galvanotechnik No. 9, vol. 65(1974).
“Active Carbon” by Bansai et al. (New York, 1988).

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