The electrochemical properties of Ni(111) prepared and characterized by surface analytical techniques have been examined in alkaline media by cyclic voltammetry using an ultra high vacuum (UHV) - electrochemical cell transfer system designed and built in this laboratory. Prior to the transfer, the Ni(111) surface was exposed to saturation coverages of CO in UHV in an attempt to protect the surface from possible contamination with other gases during the transfer and to prevent the surface from undergoing spontaneous oxidation upon contact with the electrolyte. On the basis of the results obtained it was concluded that: Ni(111) surfaces displaying c(4×2) LEED patterns after exposure to saturation coverages of CO at room temperature react with water and/or adventitious O2 immediately prior to contact with the electrolyte. Temperature programmed desorption of such exposed surfaces yields CO2 and water as the only products suggesting that the layer consists of some form of hydrated carbonate denoted as reacted c(4×2)CO/Ni(111). The reacted c(4×2)CO/Ni(111) appears to protect the surface from spontaneous oxidation upon contact with the electrolyte.
|Number of pages||9|
|Journal||Proceedings - The Electrochemical Society|
|Publication status||Published - 1990 Dec 1|
|Event||Proceedings of the Symposium on Nickel Hydroxide Electrodes - Hollywood, FL, USA|
Duration: 1989 Oct 16 → 1989 Oct 18
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