A mixed-potential-type $ NO_{2} $ sensor based on a layered-structure $ Bi_{2} %$ W_{2} %$ O_{9} $ sensing electrode

Abstract Layered-structure $ Bi_{2} %$ W_{2} %$ O_{9} $ powders synthesized by conventional solid-state reaction and treated by ball milling have been used to create an electrode for a mixed-potential-type $ NO_{2} $ sensor with yttria-stabilized zirconia as an oxygen ion conductor. This sensor was...
Ausführliche Beschreibung

Abstract Layered-structure $ Bi_{2} %$ W_{2} %$ O_{9} $ powders synthesized by conventional solid-state reaction and treated by ball milling have been used to create an electrode for a mixed-potential-type $ NO_{2} $ sensor with yttria-stabilized zirconia as an oxygen ion conductor. This sensor was found to provide good sensitivity to $ NO_{2} $ at 500 °C, thanks to the grain refinement induced by ball milling. The electromotive force generated was linear to the logarithm of $ NO_{2} $ concentration in the range of 30–500 ppm, with analysis of the impedance spectroscopy revealing a similar linear correlation between the conductance of the electrode and the logarithm of $ NO_{2} $ concentration. The influence of $ CO_{2} $ was also examined and found to have little effect on the sensitivity of the sensor. Ausführliche Beschreibung