Nitrogen oxides sensor cell

Recent Developments in Electrochemical Solid Polymer Electrolyte Sensor Cells for Measuring Carbon Monoxide and Oxides of Nitrogen... 

Amperometric gas sensors are - electrochemical cells that produce a - current signal directly related to the concentration of the - analyte by - Faraday s law and the laws of - mass transport. The schematic structure of an amperometric gas sensor is shown in Fig. 1. The earliest example of this kind of sensor is the - Clark sensor for oxygen. Since that time, many different geometries, membranes, and electrodes have been proposed for the quantification of a broad range of analytes, such as CO, nitrogen oxides, H2S, O2, hydrazine, and other vapors. 

Figure 9.4 shows a cross-sectional view of a laminated-type sensor for atmospheric nitrogen oxides based on YSZ, acting as an oxidation-catalyst electrode (Ono et al., 2004). The cell was fabricated by firing YSZ sheet on which the oxidation-catalyst platinum anode and the platinum counterelectrode were screen-printed. The porosity of the electrode is adjusted by adding resin powder into each electrode paste. 

Liquid Electrolyte Sensors The construction of amperometric cells with liquid electrolytes for gas analysis does not differ principally from those for measurements in liquids. Differences can be found in the utilized membranes, electrolytes and electrode materials. Gases as carbon monoxide or nitrogen oxide can be determined only with catalytically activated... 

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