The limiting current for reduction of ferricyanide ion at nickel: The importance of experimental conditions

摘要: Steady state, hydrodynamic voltammetry is a well established technique to measure the rate of mass transport an electroactive species to, or from, solid surface electrode in aqueous electrolyte. Limiting current measurements during reduction ferricyanide (hexacyanoferrateIII) ion at nickel rotating disc (RDE) are critically considered, and accuracy quantitatively assessed. The importance pretreatment, type indifferent electrolyte, effect sunlight considered. values can show large deviations from predicted by Levich equation for laminar flow polished RDE when unsuitable conditions employed, despite appearance well-defined limiting plateaux. Using appropriate pretreatment experimental procedures, averaged coefficients currents be obtained, which close smooth RDE.