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Nanoceria – Energetics of Surfaces, Interfaces and Water Adsorption
Author(s) -
Hayun Shmuel,
Shvareva Tatiana Y.,
Navrotsky Alexandra
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04648.x
Subject(s) - calorimetry , adsorption , enthalpy , anhydrous , water vapor , chemistry , standard enthalpy of formation , oxide , energetics , standard enthalpy change of formation , thermodynamics , materials science , organic chemistry , physics
The surface and interface enthalpies of CeO 2 were studied by high temperature oxide melt solution calorimetry combined with water adsorption calorimetry. The surface enthalpies of the hydrated and anhydrous surfaces are 0.86 ± 0.02 and 1.16 ± 0.02 J/m 2 , respectively. The water adsorption enthalpies are similar for nano and bulk ceria; for the nano ceria the integral adsorption enthalpy for chemisorbed water relative to water vapor is −59.82 ± 0.74 kJ/mol with coverage of 8.79 ± 0.39 H 2 O /nm 2 and for the bulk it is −61.69 ± 1.26 kJ/mol with coverage of 8.15 ± 0.66 H 2 O /nm 2 . The interfacial enthalpy is 0.81 ± 0.14 J/m 2 . The obtained energies are in good agreement with reported data from atomistic simulations and less direct experimental determinations.