SO₂ Concentration Cell with Li₂O-B₂O₃-Li₂SO₄ Solid Electrolyte

Abstract

Crystallization of a glass with the composition of 33.9Li₂O-33.9B₂O₃-29Li₂SO₄-3.2Al₂O₃ was investigated by DTA and Dilatation methods. The electrical conductivity of the crystalline glass and the electromotive force (EMF) of the concentration cell made with the crystalline glass as the solid electrolyte were measured.
The results indicate that the glass-transition temperature is 650 K and the softening temperature of the crystalline glass is higher than 971 K.
The temperature dependencies of the specific conductivity are expressed as follows;
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\ oindentand their apparent activation energies for conduction are 100.8 kJ mol⁻¹(593∼833 K) and 35.9 kJ mol⁻¹(833∼943 K).
The concentration cells showed a stable Nernstian EMF corresponding to the partial pressure of SO₂ in a range of 43-800 ppm SO₂ in a stream containing 0.21 atm O₂. The response time of the cell was 150 to 900 s at 873 K.