Study On The Properties Of Storage Battery In Thionine-iron System

Abstract:Thionine (Th) is one kind of important photosensitive dyes. Exposed in sunlight, it can absorb photons and excite easily. Fe3+/Fe2+redox couple is suitable for battery, which has good reversibility, fast dynamic characteristics, non-pollution and cheap. Th-Fe (Ⅱ) system can be used to convert light energy to electric energy.The battery was built with ion exchange membrane technique. The battery electromotive force, cyclic voltammograms of thionine couple, and the performance of the battery were studied. The electromotive force experiment results show that under the concentration of thionine of0.5mmol·L-1, the concentration of Fe2+of0.01mol·L-1, the electromotive force of the battery is larger. When increasing the thionine concentration, the battery performance descends, as thionine can polymerize. The cyclic voltammograms experiment results indicate that the electrode reaction mechanism of thionine-iron system is very complicated. There are two pairs of redox peaks on cyclic voltammograms of thionine couple. A linear relationship with Ip-v1/2indicates that electrochemical reaction process of thionine solution is controlled by diffusion and mass transfer of stationary liquid layer near the surface of the electrode of the electrode.The charge-discharge experiments results of the thionine-iron system electric energy storage battery show that using different working electrodes, the charge-discharge characteristics are different. The battery shows good charge-discharge performance when used platinum net. The performance on storage battery in thionine-iron system was influenced by reasonable charge-discharge mechanism. When used large current for charging and small current for discharging, the coulomb efficiency is higher. Cycle charge-discharge experiment indicates that the battery has a good cycle performance. The solar energy battery performance in thionine-iron system was studied. The results show that the photocurrent of the battery was improved with increasing the concentration of thionine. The biggest photocurrent can be up to about3mA.