Abstract
Formation of an interfacial structure at an electrochemically polished Bi(111) surface in 1wt.% 1-ethyl-3-methylimidazolium iodide+1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid mixture has been analysed using the high-resolution in situ electrochemical scanning tunneling microscopy, cyclic voltammetry and electrochemical impedance methods. At 22±1°C, a well-defined 2-dimensional superstructure has been demonstrated within the electrode potential (E) region from −0.7V to −0.3V (vs. Ag|AgCl in the same mixture of the ionic liquids), where a strong specific I− anion adsorption and coadsorption of counter-ions occurs. At E<−0.8V, the superstructure disappears as a result of desorption of the specifically adsorbed iodide anions from the Bi(111) surface. At E≥−0.2V, where Bi(111) surface oxidation process starts, the 2D-superstructure cannot be observed due to a quick atomic-scale roughening of the Bi(111) plane.
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