Ag_2O:SiO_2:V_2O_5 GLASS SYSTEM: A NOVEL REFERENCE ELECTRODE FOR SO_2 GAS SENSOR

摘要

Ag_2O:SiO_2:V_2O_5 glass system with 0.5≤ y ≥ 0.66 for fixed n = 9 is synthesized, structurally and electrically characterized with a view to have high glass transition temperature (T_g ≈ 500°C) which can be used as solid reference electrode in electrochemical SO_x gas sensor application. 10Ag_2O:40SiO_2:50V_2O_5 glass having T_g ≈ 502°C exhibits maximum bulk and electronic conductivity 3.67~*10~(-3) and 4.47~*10~(-2) S/cm, respectively at 450°C. The increase in conductivity is understood to be due to a mixed former effect. A few galvanic SO_x sensors fabricated utilizing optimized glass as reference and Ag+ conducting solid electrolyte responds to change in P_(sox) according to 2 electron cell reaction.