NICKEL NET SUPPORTED CERMET DIAPHRAGMS AND DISTANCE-FREE ELECTRODE - DIAPHRAGM SANDWICHES FOR ADVANCED ALKALINE WATER ELECTROLYSIS
Thin nickel nets pretreated by cold-rolling are then covered by sieve printing by a "green" coating (0.1 mm thickness) on each side consisting of a finely ground mixture of BaTio-3 and NiO (ratio: proprietary) and an organic binder which can be easily vapourized upon heating. Sintering under reductive atmosphere (H-2O/H-2 - mixtures) at the appropriate sintering temperature for the oxide ceramic results in formation of a cermet coating which is highly flexible, adhering tightly to the supporting nickel net and not affected by vulneration of the surface. It insulates the nickel net perfectly, and net together with cermet form a flexible sheet. By sieve printing, "green" electrode layers consisting of NiO pasted together with a volatile organic binder can be applied on green nickel net-backed cermet-diapghrams. Reductive sintering results in formation of porous nickel structure and in tight connection between the cermet and the porous nickel layer which may serve as an electrode. For high current-density electrolyzers it is advisable to structure the electrode layers like perforated plate electrodes + this measure decreases the surface specific resistance of the (porous electrode) / unit.
Bibliographic Reference: EUR 10291 EN (1985) MF, 39 P., BFR 150, BLOW-UP COPY BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989125013300 / Last updated on: 1987-02-01
Available languages: en