SPE COMPOSITE MICRODISK ELECTRODES USED IN ORGANIC ELECTROSYNTHESIS

An SPE composite microdisk electrode is made by pressing a microdisk e lectrode on a piece of SPE membrane. It has a small ohmic drop and sho ws good reproducibility and some well-developed cyclic voltammograms a nd steady-state polarization curves are obtained. The electrochemical behavior of nitrobenzene and ferrocene at different microelectrode/SPE membrane interfaces is investigated. It is found that electroactive c ompounds in the vicinity of the interface diffuse from the bulk soluti on to the electrode surface through the SPE membrane. This technique i s suitable for investigating the electrochemical behavior of gases at the metal/SPE interface or organic electroactive compounds poorly solu ble in aqueous solution without addition of supporting electrolyte.