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Gas Polarographic Oxygen Sensor Using the Pores of the Pt Cathode as a Gas Diffusion Barrier

A gas polarographic oxygen sensor using the pores of the Pt cathode as an oxygen diffusion barrier has been investigated in O2–N2 gas mixtures at 600°C. As expected, the pores of the cathode functioned as a gas diffusion barrier restricting the access of gaseous oxygen to the interface of the Pt cathode and a zirconia electrolyte; consequently, the limiting current was realized. The resulting current increased linearly with the oxygen concentration in the range of 3–25% in the ambient atmosphere when the voltage applied to the cell was held constant within a range of 0.6–2.4 V. In addition, the output current of the sensor was interpreted to be a mixed current of both an ohmic current proportional to the applied voltage and a current based on the diffusion restriction of gaseous oxygen.