Gas diffusion electrodes

• US 5,242,765 A
• Filed: 06/23/1992
• Issued: 09/07/1993
• Est. Priority Date: 06/23/1992
• Status: Expired due to Fees

• Current Assignee: LUZ Electric Fuel Israel Limited
• Original Assignee: LUZ Electric Fuel Israel Limited
• Inventors: Goldstein, Jonathan R., Naimer, Neal, Sassen, Jonathan, Khasin, Eric E.
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US07/903,115
• Time in Patent Office: 441 Days
• Field of Search: 429/40, 429/42, 429/27, 429/209, 429/212, 429/217, 427/115, 29/623.5, 204/280, 204/294
• US Class Current: 429/405
• CPC Class Codes: H01M 4/86 Inert electrodes with catalytic activity, e.g. for fuel cells
• CPC Class Codes: H01M 4/96 Carbon-based electrodes
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y10T 29/49115 including coating or impregnating

Abstract

The invention provides a gas diffusion electrode containing a fiber reinforced composite structure in a layer thereof, the structure comprising structurally intact fibers precoated with sinterable polymeric material, which material is heat sintered, whereby the fibers are bonded to each other and to other components of the structure by the sintered polymeric material, while maintaining their individual fibrous structure and strength.

Claims

1. A gas diffusion electrode containing a fiber reinforced composite structure in a layer thereof, said structure comprising structurally intact fibers precoated with sinterable polymeric material, which material is heat sintered, whereby said fibers are bonded to each other and to other components of said structure by said sintered polymeric material, while maintaining their individual fibrous structure and strength.

2. A gas diffusion electrode according to claim 1, wherein said layer is an active layer.

3. A gas diffusion electrode according to claim 1, wherein said layer is a blocking layer.

4. A gas diffusion electrode according to claim 3, wherein said polymeric material is hydrophobic.

5. A gas diffusion electrode according to claim 1, wherein said electrode is part of a metal-air battery.

6. A gas diffusion electrode according to claim 1, wherein said electrode is part of a hydrogen-oxygen fuel cell.

7. A gas diffusion electrode according to claim 1, wherein said electrode is part of an electrosynthesis cell.

8. A gas diffusion electrode according to claim 1, wherein said fibers have a length of between about 100 and 5000 microns and a diameter of between about 5 and 500 microns.

9. A gas diffusion electrode according to claim 1, wherein said intact fibers are carbon fibers, coated with a fluoropolymer.

10. A gas diffusion electrode according a claim 1, wherein said intact fibers are fluoropolymer fibers, coated with a different fluoropolymeric material, said material having a lower sintering temperature than said fibers.