Iridium-Based Small Mercury Electrodes

摘要

A method of the preparation of small (63. 5 micrometers radius, approx 60 micrometers thick) mercury electrodes based on an iridium disk support is described. The electrodes are of hemispherical shape and are relativey durable, and the potential range for their use overlaps with that for hanging mercury drop electrodes. In situ microscopic observations combined with electrochemical measurements indicate that the amount of mercury required to attain complete coverage is equivalent to approx 50% of that required to form a regular hemisphere of the radius of the iridium base. The most durable electrodes were those with the amount of deposited mercury sufficient to form such a regular hemisphere. Some cyclic linear scan and stripping experiments are described to present the behavior of this type of electrode. Keywords: Microelectrodes, Iridium, Voltammetry.