ELECTROCATALYTIC OXIDATION OF HYDRAZINES AT A 4-PYRIDYL HYDROQUINONE SELF-ASSEMBLED PLATINUM-ELECTRODE AND ITS APPLICATION TO AMPEROMETRIC DETECTION IN CAPILLARY ELECTROPHORESIS

4-Pyridyl hydroquinone on a platinum electrode adsorbs through the pyr idine nitrogen forming stable self-assembled layers. The electrocataly tical oxidation of hydrazines was performed by the modified electrode. The overpotential of hydrazines was decreased markedly at the self-as sembled monolayer (SAM) electrode. The mechanism of hydrazine oxidatio n was also investigated. Amperometric detection of hydrazine under zer o potential (vs Ag\AgCI\sat. KCl) was exhibited by the SAM electrode u sed as an electrochemical detector in a flow system. (C) 1998 Elsevier Science S.A. All rights reserved.