Open AccessPhoto-oxidation of an organosulfur for photo-charging of lithium-ion batteries
Author(s) -
H. Shingu,
Hiroshi Uemachi,
Akihiko Fujiwara
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/625/1/012020
Subject(s) - organosulfur compounds , chemistry , intramolecular force , photochemistry , absorption spectroscopy , lithium (medication) , aqueous solution , absorption (acoustics) , redox , inorganic chemistry , organic chemistry , sulfur , materials science , medicine , physics , quantum mechanics , composite material , endocrinology
Polymers of organosulfur with S-S bonds are potential cathode materials for high-capacity lithium-ion batteries, and the photo-oxidation of organosulfurs can be applied in the future to the photo-charging of batteries. Herein, we present the photo-oxidation of dithiobiuret (DTB), a simple organosulfur molecule with two neighbouring tautomeric thiol/thione groups (-SH/>C=S) that can form a disulfide (S-S) bond by reversible intramolecular oxidative cyclization. Aqueous solutions of DTB with different pH values were irradiated by visible light from a halogen lamp. Photo-oxidation was confirmed by ultraviolet (UV) absorption spectroscopy, on comparison of the UV absorption spectra of DTB and chemically oxidized DTB. The rate of photo-oxidation depended on the pH of the DTB solution, and the highest photo-oxidation rate of ∼ 2.8 × 10 −3 min. −1 was observed at a pH of ∼ 3.1.