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An SOx (x = 2, 3) sensor using ?-alumina/Na2SO4 couple

Akila, R and Jacob, KT (1989) An SOx (x = 2, 3) sensor using ?-alumina/Na2SO4 couple. In: Sensors and Actuators, 16 (4). pp. 311-323.

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Official URL: http://dx.doi.org/10.1016/0250-6874(89)85002-4


A solid-state sensor for SOx (x = 2, 3) species has been designed using ?-alumina as the solid electrolyte and Na2SO4 as the auxiliary electrode. The measured e.m.f. of the cell Pt, O?2 + SO?2 + SO?3|Na2SO4short parallel?-aluminashort parallelNa2SO4|SO?3 + SO?2 + O?2, PT in the temperature range 700 K to 1150 K agrees well with values calculated using the Nernst equation. The sodium sulphate acts both as a protective covering, preventing direct access of the gaseous SOx species to the ?-alumina electrolyte, and as an auxiliary electrode, converting chemical potentials of SOx species and O2 into an equivalent sodium potential. The open-circuit e.m.f. varies non-linearly with temperature for fixed composition of inlet gas mixtures containing SO2, O2 and Ar. The response time (t0.99) of the cell varies between 1.9 ks at 750 K and 0.06 ks at 1100 K. The e.m.f. response is faster when the partial pressure of SOx at the electrode is increased than when it is decreased.

Item Type: Journal Article
Publication: Sensors and Actuators
Publisher: Elsevier science
Additional Information: Copyright of this article belongs to Elsevier science.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 13 Oct 2010 09:34
Last Modified: 13 Oct 2010 09:34
URI: http://eprints.iisc.ac.in/id/eprint/33099

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