NO2 adsorption behaviour on LaFeO3 electrodes of YSZ-based non-nernstian electrochemical sensors

Abstract

X-ray photoelectron spectroscopy (XPS) was\ud used to examine the NO2 adsorption behaviour on the LaFeO3 and Pt electrodes of planar yttria stabilized zirconia non-Nernstian gas sensors. The electrochemical sensors\ud were exposed to the same gas atmosphere containing 1000 ppm NO2 at 650°C. XPS of the as-prepared sensors and sensors after exposure to NO2 revealed bonded\ud nitrogen peaks on the surface of the semiconducting oxide but no nitrogen peaks on the Pt electrode. Therefore, NO2\ud adsorption on a LaFeO3 electrode plays an important role in the NO2 detection mechanism

Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties

“…ABO 3 perovskite-type oxides, with A = rare earth and B = transition metal ion [1], have been extensively studied for various advanced technological applications, such as catalysts [2,3], fuel cells [4], Li-O 2 batteries [5], magnetic materials [6], electrode [7], and gas sensors [8][9][10][11]. This is because that the ABO 3 perovskite structure is usually with structural defects due to fluctuations between the two stable oxidation states of iron; which causes the electrical balance by insertion in the lattice of O 2 − from environmental O 2 or the occurrence of oxygen vacancies [12], ABO 3 perovskite-type oxides always show superior properties in many applications.…”