METHOD FOR APPLYING ELECTRODES TO CERAMIC ELECTROCHEMICAL GAS ANALYSERS

摘要

This specification discloses an electrochemical gas sensor having a zirconia substrate and electrodes each comprising a thin substantially continuous layer of platinum securely bonded to the substrate and a relatively thicker electrically conductive metal bonded to said thin layer. In one form the thicker metal comprises a layer of porous platinum bonded to said thin layer, the thin layer being from .08.mu.m and 1.5.mu.m to 500.mu.m thick. In an alternative form the thicker metal comprises a fine electrically platinum wire bonded to the thin layer by a similar thin layer of platinum applied over the wire. A method of applying the electrodes to the substrate is also disclosed.