Feasibility of potentiometric oxygen gas sensor based on perovskite and sodium titanate measuring electrode

Joel Ramirez-Salgado (1) , Pierre Fabry (1)

1 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces

A new solid potentiometric sensor for the oxygen gas detection using NASICON as solid electrolyte is proposed and tested in the range 300–700 °C for a feasibility study. The measuring electrode is a mixture of Na₂Ti₃O₇–Na₂Ti₆O₁₃ and La_1−xSr_xMnO_3±δ (LSM) as mixed electronic and ionic conductors. A system based on Ni-NiO/Na₂Ti₃O₇–Na₂Ti₆O₁₃ is used as solid internal reference. A linear relationship was observed between the sensor output and the logarithm of oxygen concentration. The response is in good agreement with the theoretical Nernstian equation in a large range (10⁻² to 10⁻¹⁶ atm). A very fast response was observed.

Mots clés: Oxygen sensor; NASICON; Na₂Ti₃O₇–Na₂Ti₆O₁₃; La_1−<i>x</i>Sr_<i>x</i>MnO_3±<i>δ</i>

Domaines: Matériaux

Joel Ramirez-Salgado, Pierre Fabry. Feasibility of potentiometric oxygen gas sensor based on perovskite and sodium titanate measuring electrode. Sensors and Actuators B: Chemical, 2002, 82 (1), pp. 34-39. ⟨10.1016/S0925-4005(01)00986-8⟩. ⟨hal-00418199⟩