POTENTIOMETRIC SOLID ELECTROLYTE OXYGEN SENSOR

摘要

Provided are: a detection electrode material for a potentiometric solid electrolyte oxygen sensor which can operate as an oxygen sensor suitably and which does not use platinum in the detection electrode and therefore can achieve a cost reduction; and a concentration cell type oxygen sensor and a lambda oxygen sensor which each use the detection electrode material. This potentiometric solid electrolyte oxygen sensor (1) is provided with: a detection electrode (10); an oxygen-ion conducting solid electrolyte (20) on which the detection electrode (10) is provided at a prescribed site; and a reference electrode (30) which is made of platinum and which is provided on the solid electrolyte (20) at a site that is present on the surface opposite to the surface where the detection electrode (10) is provided and that is exposed to the atmosphere. The detection electrode (10) is made of an oxide represented by BaxSr(1-x)FeO(3-δ) [wherein x is a value of 0.1 to 1.0 and δ is a value exceeding 0 and up to 0.5].