Ig. Casella et M. Gatta, Electrochemical and XPS characterization of composite modified electrodes obtained by nickel deposition on noble metals, ANALYT CHEM, 72(13), 2000, pp. 2969-2975
A chemically modified electrode composed of nickel oxyhydroxide film deposi
ted on noble metals (i.e., gold or platinum) was characterized in an alkali
ne medium by cyclic voltammetry and XPS (X-ray photoelectron spectroscopy)
techniques. The nickel was deposited on the gold substrate in an alkaline m
edium by various strategies: cycling the potential between -0.1 and 0.65 V
vs SCE, in potentiostatic conditions at potentials comprised between 0.0 an
d 0.55 V and by simple immersion of the electrode in non-deaerated 0.2 M Na
OH solutions containing 3 mM K2Ni(CN)(4). The effects of several experiment
al parameters such as applied potentials, pH, tetra-cyanonickelate concentr
ation, electrode substrate, etc., on the nickel film formation and growth w
ere evaluated. The electroactivity of the resulting composite gold-nickel e
lectrode was investigated in an alkaline medium toward the oxidation of car
bohydrates using arabinose as a model compound.