電解液内におけるイオン輸送現象のMRIタギング計測

抄録

In order to improve the performance of electrochemical devices (e.g. electrolysis system, secondary battery), further understanding of ion transport phenomena is a crucial issue. In the electrochemical devices, the ions are transported by concentration diffusion, migration, and convection of electrolyte. While the concentration diffusion has been estimated experimentally in previous studies, the convection induced by transport of solvent ions has not been understood. This is because that the flow field structure of the actual electrolysis system is highly complex and velocity measurement of the actual system was difficult. In this paper, velocity distribution measurement within an operating electrolysis system was carried out by using magnetic resonance imaging (MRI) tagging method which is non-invasive and effective for visualization of fluid motion. And we structured two types of experimental cells to extract the effect of convection on the ion transport phenomena. As a result, the convection near the electrodes was visualized in three dimensions under constant voltage electrolysis, and importance of detailed understanding of convection behavior during the electrolysis process was suggested.