The adsorption process of sulfate on well defined Cu(111) single crystal electrodes from a 5 mM H2SO4 soln. was studied by in-situ IR reflection absorption spectroscopy (IRAS) and electrochem. scanning tunneling microscopy (EC-STM). The well known formation of a Moire-like structure upon adsorption of sulfate on Cu(111) imaged by STM is supplemented by IR measurements of the initial stages of sulfate adsorption. Sulfate adsorption starts at a potential noticeably lower (more cathodic) than the potential of first Moire formation. In this potential region the adsorbed sulfate is very mobile on the surface and difficult to image by STM. Adsorption rate and sulfate coverage are strongly dependent on the electrode potential. The slow adsorption process leading to the Moire structure is compared to a fast adsorption process by applying potential steps. With the latter method no or only barely ordered sulfate adlayers were obsd. As can be shown by the IRAS measurements the satn. coverage, however, is not strongly affected by the adsorption rate. [on SciFinder(R)]     «

The adsorption process of sulfate on well defined Cu(111) single crystal electrodes from a 5 mM H2SO4 soln. was studied by in-situ IR reflection absorption spectroscopy (IRAS) and electrochem. scanning tunneling microscopy (EC-STM). The well known formation of a Moire-like structure upon adsorption of sulfate on Cu(111) imaged by STM is supplemented by IR measurements of the initial stages of sulfate adsorption. Sulfate adsorption starts at a potential noticeably lower (more cathodic) than the p...     »

CAN 139:186373 66-4 Surface Chemistry and Colloids Institut fuer Physikalische und Theoretische Chemie der Universitaet Bonn, Bonn, Germany. Journal 0161-6374 14808-79-8 (Sulfate) Role: PEP (Physical, engineering or chemical process), PRP (Properties), PYP (Physical process), PROC (Process) (sulfate adsorption and adsorbate structure on Cu(111) electrodes); 7440-50-8 (Copper) Role: PEP (Physical, engineering or chemical process), PYP (Physical process), PROC (Process) (sulfate adsorption and adsorbate structure on Cu(111) electrodes)     «

CAN 139:186373 66-4 Surface Chemistry and Colloids Institut fuer Physikalische und Theoretische Chemie der Universitaet Bonn, Bonn, Germany. Journal 0161-6374 14808-79-8 (Sulfate) Role: PEP (Physical, engineering or chemical process), PRP (Properties), PYP (Physical process), PROC (Process) (sulfate adsorption and adsorbate structure on Cu(111) electrodes); 7440-50-8 (Copper) Role: PEP (Physical, engineering or chemical process), PYP (Physical process), PROC (Process) (sulfate adsorption and ad...     »