Heterogeneous catalysts containing late transition metals dispersed across metal oxide supports are found in present and emerging technologies such as fuel cells, solar cells, chemical production and environmental cleanup.  A fundamental understanding of the bond energies between supported metal nanoparticles and oxide supports should give insight into catalytic reactivity, selectivity and sinter resistance, but experimental data is rare.  Here we measure copper adsorption and adhesion energies on CeO2-x(111) surfaces (x = 0-0.2) at 100 and 300K by adsorption microcalorimetry.  We use ion scattering spectroscopy to monitor copper nanoparticle morphology and x-ray photoelectron spectroscopy to monitor copper and ceria oxidation state.  These data show copper adsorbs as neutral atoms on CeO2-x(111) at all temperatures.  At 100 K, copper grows with a higher particle density, and at low copper doses we measure the energy of isolated copper adatoms on terrace sites.  Data at higher coverage give the Cu energy versus Cu particle size.

Energies of Cu adatoms and Cu nanoparticles on CeO<sub>2</sub>(111) surfaces studied by Cu adsorption microcalorimetry

248th National Meeting (2014)

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Energies of Cu adatoms and Cu nanoparticles on CeO2(111) surfaces studied by Cu adsorption microcalorimetry

Energies of Cu adatoms and Cu nanoparticles on CeO₂(111) surfaces studied by Cu adsorption microcalorimetry