TY - JOUR
T1 - High chemical activity of a perovskite surface
T2 - Reaction of co with sr3ru2 o7
AU - Stöger, Bernhard
AU - Hieckel, Marcel
AU - Mittendorfer, Florian
AU - Wang, Zhiming
AU - Fobes, David
AU - Peng, Jin
AU - Mao, Zhiqiang
AU - Schmid, Michael
AU - Redinger, Josef
AU - Diebold, Ulrike
N1 - Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/9/12
Y1 - 2014/9/12
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.113.116101
DO - 10.1103/PhysRevLett.113.116101
M3 - Article
AN - SCOPUS:84912004234
SN - 0031-9007
VL - 113
JO - Physical review letters
JF - Physical review letters
IS - 11
M1 - 116101
ER -