Nanopattering in CeOx/Cu(111): A New Type of Surface Reconstruction and Enhancement of Catalytic Activity

作者：Senanayake Sanjaya D; Sadowski Jerzy T; Evans Jaime; Kundu Shankhamala; Agnoli Stefano; Yang Fan; Stacchiola Dario; Flege Jan I; Hrbek Jan; Rodriguez Jose A^*

来源：Journal of Physical Chemistry Letters, 2012, 3(7): 839-843.

DOI：10.1021/jz300159p

Our results indicate that small amounts of an oxide deposited on a stable metal surface can trigger a massive surface reconstruction under reaction conditions. In low-energy electron microscopy (LEEM) experiments, no reconstruction of Cu(111) is observed after chemisorbing oxygen or after reducing O/Cu(111) in a CO atmosphere. On the other hand, LEEM images taken in situ during the reduction of CeO2/CuO1-x/Cu(111) show a complex nonuniform transformation of the surface morphology. Ceria particles act as nucleation sites for the growth of copper microterraces once CuO1-x is reduced. Can this reconstructed surface be used to enhance the catalytic activity of inverse oxide/metal catalysts? Indeed, CeOx on reconstructed Cu(111) is an extremely active catalyst for the water gas shift process (CO + H2O -%26gt; H-2 + CO2), with the Cu microterraces providing very efficient sites for the dissociation of water and subsequent reaction with CO.

• 出版日期2012-4-5