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- W1995264967 abstract "Abstract We present an extension of the first-principles model for the steady state response of electrochemical (e.g. zirconia) gas sensors. In earlier work, it was assumed that only one electrochemical reaction couples the electrical and the chemical parts of the sensing system; i.e. in an O 2 /CO/CO 2 gas mixture, the emf is due to the reaction O ads + v 0 2+ (oxide) + 2e − (electrode) O 0 that changes the concentration of charged oxygen vacancies, v 0 2+ (oxide); while CO ads , indirectly affects the emf by chemically reacting and changing the concentration of O ads , the adsorbed oxygen atoms on the metal electrode. However, CO may additionally react directly with oxygen in the metal oxide: CO ads + O 0 (oxide) CO 2ads + v 0 2+ (oxide)+ 2e − (electrode). In this paper, the model is extended to also include this reaction. For certain values of the parameters, it is shown that this additional reaction produces new features in the sensor emf versus gas-redox ratio relationship in good agreement with the experimental results. This generalized model reveals a rich diversity of sensor behavior and provides insights that can be useful in developing improved gas sensors. With appropriate modifications, the formalism is readily adaptable to resistive type of gas sensors." @default.
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- W1995264967 date "1996-10-01" @default.
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- W1995264967 title "Steady state model of electrochemical gas sensors with multiple reactions" @default.
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- W1995264967 doi "https://doi.org/10.1016/s0925-4005(97)80103-7" @default.
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