Abstract
The Nernstian behaviour of zirconia oxygen sensors incorporating composite electrodes has been described in the low temperature (<600°C) range. The composite electrodes consisting of a semiconducting metal oxide and platinum lower the operating temperature of oxygen sensors to about 300–350°C, well below that achievable with conventional metal or metal oxide electrodes. Complex impedance measurements made as a function of Pt/metal oxide ratio show that both the electrode resistance and the time constant go through a minimum when plotted against Pt content in the composite.
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