Material for gaseous diffusion electrode
US4576861A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1985 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Jan 30, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31544
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A material for use as a gaseous diffusion electrode is provided. The material has improved durability resulting in long life. the material comprises a composite of a first layer of polytetrafluoroethylene (PTFE) containing a filler of a powdered electroconductive substance and a second layer of PTFE in bonded laminar contact with the first layer. The second layer preferably contains no electroconductive filler. The first and second layers are bonded together under pressure to form an intermediate composite and this intermediate composite is stretched, to produce the material of the invention which is a composite layered product of expanded PTFE having nodes interconnected by fibrils, one layer containing electroconductive material and the second layer preferably containing no electroconductive material. A catalytic substance can be incorporated onto or into at least the first layer by either deposition or by a filler of catalytic powder for use as the gas diffusing electrode of the invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.