<sub></sub>Mg<sub>2</sub>Cu<sub>x</sub>Fe<sub>1</sub>O<sub>3.5+x </sub>Mixed Metal Oxides as Ammonia Sensitive Material of Ammonia Sensors

Abstract

Mg2CuxFe1O3.5+xmixed metal oxides were found to be active catalysts for the selective oxidation of ammonia. In this paper, Mg2CuxFe1O3.5+xmixed metal oxides were prepared by co-precipitation method and calcined at 600°C for 12 h in an air atmosphere, then ammonia sensors have been made by screen-printed Mg2CuxFe1O3.5+xelectrode on the electrolyte (8moleYSZ) surface and sintered at 1126°C for 1h in an air atmosphere. The samples were characterized by XRD and ESEM. The performance of ammonia sensors were tested in different concentration of ammonia. It can be found that Mg2Cu0.25Fe1O3.75electrode showed a higher response value and good sensitivity to ammonia at 350°C, the value of sensitivity is 226.6mV/decsde. The influences of Cu content on the ammonia response performance of Mg2CuxFe1O3.5+xmixed metal oxides electrodes are discussed.