Structure of the (bi)carbonate adlayer on Cu(100) electrodes

Authors: Reihaneh Amirbeigiarab, Alexander Bagger, Jing Tian, Jan Rossmeisl,* and Olaf M. Magnussen*


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(Bi)carbonate adsorption on Cu(100) in 0.1 M KHCO3  has been studied by in situ scanning tunneling microscopy. Coexistence of different ordered adlayer phases with (sqrt(2) , 6 sqrt(2))R45° and (4 , 4) unit cells was observed in the double layer potential regime. The adlayer is rather dynamic and undergoes a reversible order-disorder phase transition at 0 V vs. the reversible hydrogen electrode. Density functional calculations indicate that the adlayer consists of coadsorbed carbonate and water molecules and is strongly stabilized by liquid water in the adjacent electrolyte.