Potentiometric SO₂ gas sensor based on Ca²⁺ conducting solid electrolyte

Authors: Wang, L.; Kumar, R. V.

Source: Materials Science and Technology, Volume 19, Number 11, November 2003 , pp. 1478-1482(5)

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Abstract:

A new SO₂ sensor based on Ca²⁺ conductor CaO.0^.6MgO.6Al₂O₃ (CMA) with a Na₂SO₄auxiliary electrode and Pt/O₂ reference electrode has been fabricated and tested. In this design, both the electrodes are exposed to the same test gas thus eliminating the need to separate electrode chambers. Experimental results showed that the sensor response to SO₂ is rapid and stable and the 90% response time is about 1 min. The measured emf of the sensor is a linear function of the logarithm of partial pressure of SO₂ over a concentration range 1-1000 ppm and a temperature range 873-1073 K. In this cell, the CMA/Pt interface was sensitive to oxygen, while the Na₂SO₄/Pt interface was sensitive to SO₃.

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Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708303225008077

Publication date: 2003-11-01

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