E. Itabashi, S. Ikeda
Sep 1, 1970
Citations
0
Influential Citations
34
Citations
Journal
Journal of Electroanalytical Chemistry
Abstract
Summary In aqueous thiocyanate solution containing tetraethylammonium ions nickel-(II) gave a catalytic polarographic current which appears as a maximum wave in the potential region where the reduction wave of nickel(II) in thiocyanate solution reaches its limiting plateau. The characteristics of this catalytic wave have been investigated by d.c. polarography, i—t curve analysis, a.c. polarography and controlled potential electrolysis method. The catalytic current has been studied as a function of concentration of nickel(II), NaSCN, and Et 4 NClO 4 . The effect of mercury height, stirring, pH, surfactant, and temperature on the catalytic wave has been described. The, controlled potential electrolysis for the nickel(II)-thiocyanate system indicated that the thiocyanate ion is reduced to cyanide and sulphide ions. A mechanism which involves a rapid adsorption equilibrium between the bulk and adsorbed nickel(II)-thiocyanate complexes and the catalytic reduction of thiocyanate ion with the electroreduced active metallic nickel has been proposed. The role of tetraethylammonium ions on the catalytic wave is also discussed.