ABSTRACT OF THE DISCLOSUREThis specification discloses an electrochemicalgas sensor having a zirconia substrate and electrodeseach comprising a thin substantially continuous layerof platinum securely bonded to the substrate and arelatively thicker electrically conductive metal bondedto said thin layer. In one form the thicker metalcomprises a layer of porous platinum bonded to saidthin layer, the thin layer being from .08µm and 1.5µmto 500µm thick. In an alternative form the thickermetal comprises a fine electrically platinum wirebonded to the thin layer by a similar thin layer ofplatinum applied over the wire. A method of applyingthe electrodes to the substrate is also disclosed.
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