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- W2313063721 abstract "Abstract An electrochemical cell employing a YSZ electrolyte and two Au electrodes was utilized as a model system for investigating the mechanisms responsible for impedancemetric NO x (NO and NO 2 ) sensing. The cell consists of two dense Au electrodes on top of a porous/dense YSZ bilayer structure (with the additional porous layer present only under the Au electrodes). Both electrodes were co-located on the same side of the cell, resulting in an in-plane geometry for the current path. The porous YSZ appears to extend the triple phase boundary and allows for enhanced NO x sensing performance, although the exact role of the porous layer is not completely understood. Impedance data were obtained over the frequency range of 0.1 Hz to 1 MHz, and over a range of oxygen (2 to 18.9%) and NO x (10 to 100 ppm) concentrations, and temperatures (600 to 700 °C). Data were fit with an equivalent circuit, and the values of the circuit elements were obtained for different concentrations and temperatures. Changes in a single low-frequency arc were found to correlate with concentration changes, and to be temperature dependent. In the absence of NO x , the effect of O 2 on the low-frequency resistance could be described by a power law, and the temperature dependence described by a single apparent activation energy at all O 2 concentrations. When both O 2 and NO x were present, however, the power law exponent varied as a function of both temperature and concentration, and the apparent activation energy also showed dual dependence. Adsorption mechanisms are discussed as possibilities for the rate-limiting steps." @default.
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- W2313063721 date "2006-01-01" @default.
- W2313063721 modified "2023-09-27" @default.
- W2313063721 title "Impedance Analysis of Electrochemical NOx Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell" @default.
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- W2313063721 doi "https://doi.org/10.1557/proc-0972-aa12-02" @default.
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