Abstract
A technique is described for characterizing the response behaviour of nernstian gas sensors to sinusoidal pressure modulation in the frequency range 0.1–1000 Hz. Relaxation times down to 0.2 ms could be resolved for first-order kinetics. For ceria-based oxygen sensors the shape of the spectra indicated diffusion-controlled kinetics and provided additional information when compared with electrochemical impedance spectra. Fast relaxation times down to 2.5 ms were found at 1173 K in air for Pt electrodes. The pressure modulation technique avoided corrosion effects which might be induced by alternating currents and thus made it possible to characterize the kinetics of carbonate-based CO 2 sensors. Relaxation times were determined down to 4.5 ms at 973 K in air for Pd electrodes.
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