Electrochemicla behaviour of the Cr(II)/Cr(III) couple on silver, silver amalgam and silver based mercury film electrodes

L.M. YUDI; A.M. BARUZZI; V.M. SOLÍS

SPRINGER

Lugar: Berlin; Año: 1988 vol. 18 p. 417 - 417

he electrocatalytic activity of silver, mercury, silver-based mercury films, and silver amalgam electrodes for the reduction of Cr(III) ions in acidic solutions is analysed. An enhancement in the activity of the last two electrodes is observed when they are pretreated with high cathodic current polarization or ultrasonic waves. These effects can be explained by the formation of an unstable highly reactive amalgam. The electrocatalytic enhancement is not observed when the same electrode pretreatments are applied to sitting-drop mercury or silver electrodes.