Abstract

The mixed potential sensor coupling La-doped Ba 2 In 2 O 5 (BLIO) and tin-doped indium oxide (ITO) as the electrolyte and sensing electrode, respectively, was investigated to detect the reducing gases such as CO. The fabricated planar ITO‖BLIO‖Pt sensor exhibited a fast response to low-level CO concentrations from ∼100 to ∼400 ppm above 600°C. The sensor signal was not affected by changes of oxygen concentrations from ∼4 to ∼21 vol % and methane (<300 ppm). The advantage of utilizing BLIO as the electrolyte is to have a better chemical compatibility and stability at the interface of the ITO-sensing electrode and BLIO solid electrolyte.

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