Electrode for current-limited cell, cell including the electrode method for using the cell and a method of making the electrode
US5085743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1990 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | May 2, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The gas-sensing electrodes prepared according to this invention are specifically designed for cells which operate in a current-limited mode, i.e. at current densities well below 20 mA/cm.sup.2. Such cells are particularly useful to measure or detect a gaseous component of a gaseous environment or stream, provided the gaseous component can be electrochemically oxidized or reduced. In an alkaline, metal-oxygen cell for example, an electrode of this invention can be used as an oxygen cathode. The electrode is prepared by: PA1 (a) bringing an exposed face of a self-supporting, electrically-conducting sheet of fibrous or sintered-particle material having a thickness of at least about 30 .mu.m and a flexural strength of at least 2000 kPa into contact with an electrolyte containing ions of a catalytic metal, the electrolyte also being in contact with a counterelectrode, PA1 (b) applying a pulsed-D.C. current which tends to favor electroplating of metal and strong adherence of the plated metal to the electrically-conducting sheet, so that a continuous electrodeposited layer of catalytic metal is formed, and PA1 (c) applying a hydrophobic layer to the thus-plated face, this hydrophobic laye…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.