Simultaneous EIS and in situ microscope observationApplication to the scale electrodeposition

摘要

A new experimental device was presented to investigate the in situ scalernelectrodeposition through a transparent quartz crystal microbalance (QCM). A microscopernlens was set behind the transparent working electrode leading a 400 × 300 μm field of view tornbe observed from a 5 mm in diameter electrode. A potential corresponding to the current ofrnoxygen reduction was applied allowing the interfacial pH between the solution and thernelectrode surface to be increased. The pH enhancement promoted the scale deposition from arncarbonically pure water. The QCM led the current of oxygen reduction and the mass of thernelectrodeposit to be measured versus time. The original transparent electrode allowed thernCaCO3 vaterite and calcite crystal growth to be observed versus time. The image processingrnsoftware allowed the nuclei to be counted over time from 1 μm minimum size. As the kineticrnof coverage was perfectly defined, the electrochemical impedance and the microscopernobservation through the transparent electrode were measured simultaneously versus time.