High chemical activity of a perovskite surface: reaction of CO with Sr(3)Ru(2)O(7).

نویسندگان

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

Adsorption of CO at the Sr(3)Ru(2)O(7)(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 E(ads)=-0.7  eV. Above 100 K, this physisorbed CO replaces the surface O, forming a bent CO(2) 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 (-2.2  eV) energy confirm a strong reaction between CO and regular surface sites of Sr(3)Ru(2)O(7); likely, this reaction causes the "UHV aging effect" reported for this and other perovskite oxides.

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عنوان ژورنال:
  • Physical review letters

دوره 113 11  شماره 

صفحات  -

تاریخ انتشار 2014