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- W2078391655 abstract "Recent surface chemistry experiments help explain the operation of an exhaust gas NOx sensor that uses a platinum–gold alloy electrode to selectively remove oxygen but not NO from an interior chamber. The electrode surface must dissociate O2 for removal by electrochemical pumping, but must be at least 100 times less active for dissociating NO. In ultrahigh vacuum studies on stepped platinum single crystals, NO dissociation is strongly suppressed by surface gold coverages as low as 0.4 monolayer (ML), as well as by co-adsorbed oxygen and NO, probably because the dissociation process requires a special ensemble of several unoccupied Pt atoms. Oxygen dissociation is much less affected by surface modifications. In general, the surface composition of an alloy is very different from its bulk composition and depends on gas composition. By considering the energetics of the Pt–Au system we argue that under all conditions of interest for sensor operation the ensembles of free Pt atoms required for NO dissociation are strongly disfavored. A surface chemistry-based explanation is also suggested for the ammonia interference reported for this NOx sensor." @default.
- W2078391655 created "2016-06-24" @default.
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- W2078391655 date "2003-11-01" @default.
- W2078391655 modified "2023-10-13" @default.
- W2078391655 title "A surface-science-based model for the selectivity of platinum–gold alloy electrodes in zirconia-based NOx sensors" @default.
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- W2078391655 doi "https://doi.org/10.1016/s0925-4005(03)00483-0" @default.
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