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• W2020887095 abstract "Trivalent cerium ions in CeO2 are the key active species in a wide range of catalytic and electro-catalytic reactions. We employed ambient pressure X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy to quantify simultaneously the concentration of the reactive Ce3+ species on the surface and in the bulk of Sm-doped CeO2(100) in hundreds of millitorr of H2–H2O gas mixtures. Under relatively oxidizing conditions, when the bulk cerium is almost entirely in the 4+ oxidation state, the surface concentration of the reduced Ce3+ species can be over 180 times the bulk concentration. Furthermore, in stark contrast to the bulk, the surface’s 3+ oxidation state is also highly stable, with concentration almost independent of temperature and oxygen partial pressure. Our thermodynamic measurements reveal that the difference between the bulk and surface partial molar entropies plays a key role in this stabilization. The high concentration and stability of reactive surface Ce3+ over wide ranges of temperature and oxygen partial pressure may be responsible for the high activity of doped ceria in many pollution-control and energy-conversion reactions, under conditions at which Ce3+ is not abundant in the bulk." @default.
• W2020887095 created "2016-06-24" @default.
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• W2020887095 date "2012-05-07" @default.
• W2020887095 modified "2023-09-29" @default.
• W2020887095 title "Highly Enhanced Concentration and Stability of Reactive Ce³⁺ on Doped CeO₂ Surface Revealed In Operando" @default.
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• W2020887095 doi "https://doi.org/10.1021/cm300574v" @default.
• W2020887095 hasPublicationYear "2012" @default.
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