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1 Polish Journal of Chemistry

1 1998

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The electrochemical scanning tunneling microscopy of the polycrystalline nickel oxidation in sulphuric acid solutions

Błaszczyk T., Kaźmierczak D., Krzyczmonik P., Scholl H.

Polish Journal of Chemistry

1998

Vol. 72, nr 9

2134-2143

A home-made Electrochemical Scanning Tunneling Microscope/Scanning Tunneling Microscope (ESTM/STM) has been used for investigations of the anodic oxidation of polycrystalline nickel, being controlled by cyclic voltammetry and coulometry. A surface fragment with a(+/-)10% accuracy at the scale of 4800 nm x 4800 nm and 100 nm x 100 nm was observed. The best compact and relatively smooth layers of nickel oxides have been obtained in a concentrated (c=10.0 mol dm(-3)) sulphuric acid solution. In a diluted electrolyte (c=0.1 mol dm(-3)), the formation of the NiO-x islands is possible.