Direct observation of hydrogen spillover in Ni-loaded Pr-doped ceria

Vaneet Sharma, Peter Crozier, Renu Sharma, James Adams

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


In situ studies on reduction processes in praseodymium-doped ceria and nickel-loaded doped ceria nanoparticles have been investigated using environmental transmission electron microscopy. The presence of pit-like defects on the oxide nanoparticles resulted in amorphization during reduction. Hydrogen-spillover in nickel-loaded praseodymium-doped ceria (PDC) was directly observed. Localized reduction of ceria in a H 2 atmosphere was observed and attributed to gas-nickel-ceria interactions at the three-phase boundary. The spatial extent of the localized reduction zones was experimentally determined. The spillover mechanism is discussed in terms of surface diffusion properties of atomic hydrogen and oxygen species.

Original languageEnglish (US)
Pages (from-to)2-8
Number of pages7
JournalCatalysis Today
Issue number1
StatePublished - Jan 17 2012


  • Hydrogen-spillover
  • In situ
  • Pr-doped ceria
  • Reduction zone
  • TEM

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)


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