Stability of Vanadium Electrolytes in the Vanadium Redox Flow Battery

Autor: Wen-Sheng Chang, Chih-Hsing Leu, Shu-Yuan Chuang, Hsiao-Hsuan Hsu, Kan-Lin Hsueh, Chun-Hsing Wu, Yi-Ray Chen
Rok vydání: 2013
Předmět:
Zdroj: MRS Proceedings. 1492:25-31
ISSN: 1946-4274
0272-9172
DOI: 10.1557/opl.2013.471
Popis: The stability of the negative electrode electrolyte affects the efficiency and capacity of energy storage in the vanadium redox flow battery (VRFB) system. To explore the stability of vanadium electrolytes, the study prepared five types of V(II) electrolytes that were exposed to air in a fixed open area and monitored the charge state of vanadium ions over time by UV/Visible spectrophotometer. This study succeeded in preparing pure V(II) electrolytes. Five characteristics are found in the UV/Visible spectra, respectively, during the oxidation process from V(II) electrolytes to V(III) electrolytes and V(III) electrolytes to V(IV) electrolytes. The experimental results show that the oxidation rate of a solution of 1 M V(II) electrolytes to V(III) electrolytes and 1 M V(III) electrolytes to V(IV) electrolytes under an atmosphere of air is 4.79 and 0.0089 mol/h per square meter. The oxidation rates of 0.05-1 M V(II) electrolytes to V(III) electrolytes are approximately 96-538 times than that of V(III) electrolytes to V(IV) electrolytes.
Databáze: OpenAIRE
Externí odkaz: