THE ELECTROCHEMISTRY OF NITROGEN-CONTAINING COMPOUNDS AT PLATINUM SINGLE-CRYSTAL ELECTRODES .1. HYDRAZINE BEHAVIOR ON PLATINUM BASAL PLANES IN SULFURIC-ACID-SOLUTIONS

The electrochemical behaviour of hydrazine on platinum single crystal electrodes with basal orientations has been studied in 0.5 M H2SO4 by means of cyclic voltammetry. Experiments have been performed in 10(-5)-10(-2) M hydrazinium sulphate, showing that its electro-oxidation is a structure-sensitive process. Adsorption experiments at open circuit and at controlled potential conditions led only to stable irreversibly adsorbed species on Pt(110). Adsorption of neutral hydrazine species takes place on Pt(100) and Pt(111) in a reversible way, apparently without net charge transfer, thus modifying the voltammetric behaviour for the adsorption-desorption processes of H(UPD) and possible anionic species.