High chemical activity of a perovskite surface: Reaction of co with sr3ru2 o7

Bernhard Stöger, Marcel Hieckel, Florian Mittendorfer, Zhiming Wang, David Fobes, Jin Peng, Zhiqiang Mao, Michael Schmid, Josef Redinger, Ulrike Diebold

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Adsorption of CO at the Sr3Ru2O7(001) surface was studied with low-temperature scanning tunneling microscopy (STM) and density functional theory. In situ cleaved single crystals terminate in an almost perfect SrO surface. At 78 K, CO first populates impurities and then adsorbs above the apical surface O with a binding energy Eads=-0.7eV. Above 100 K, this physisorbed CO replaces the surface O, forming a bent CO2 with the C end bound to the Ru underneath. The resulting metal carboxylate (Ru-COO) can be desorbed by STM manipulation. A low activation (0.2 eV) and high binding (-2.2eV) energy confirm a strong reaction between CO and regular surface sites of Sr3Ru2O7; likely, this reaction causes the "UHV aging effect" reported for this and other perovskite oxides.

Original languageEnglish (US)
Article number116101
JournalPhysical review letters
Issue number11
StatePublished - Sep 12 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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