Study on Organic Redox Flow Battery Mechanism using TEMPO and FMN-Na Solutions

Abstract

Among numerous energy storage technologies, redox flow battery is one of the promising technologies that can be used to supply reliable continuation of electricity to electricity grids with a scale up to MW or MWh. In this paper, the process mechanism and optimization of redox flow battery using organic solution such as Riboflavin-5’-phosphate sodium salt dihydrate (FMN-Na) as anolyte and 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) as catholyte were investigated. Sodium and chloride ions in salt feed were moved respectively to anolyte and catholyte by electrochemical reaction of electrolytes during the charge process and return to the feed during the discharge process. The study was carried out by given electric current with different voltage to graphite electrode range 1,5-10,5 volts and TEMPO concentration 0,02-0,08 M. The result shows that the optimum voltage is 7,5 volts with the concentration of TEMPO 0,06 M. The result also confirms the role of TEMPO solutions in the cathode. In addition to that, the FTIR and SEM analysis to the sedimentation generated during the process also revealed the change of the anolyte and catholyte after charging process.Keywords: Organic; Flow Battery; TEMPO; FMN-Na; energy storage

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Self-Discharging and Corrosion Problems in Vanadium Redox Flow Battery

“…Previously, several redox flow battery researches have been done in Indonesia (Silitonga et al, 2021;Kumara et al, 2022;Kusumah et al, 2019). In this work, metallic BPP will be evaluated based on the materials widely available in the market.…”

“…Therefore, the novelty of this study is mainly on the identification of possible spontaneous chemical reaction within anolyte tank as a potential of self-discharging reaction. Other researchers (Thaller, 1974;Rychcik & Skyllas-Kazacos, 1988;Silitonga et al, 2021;Kumara et al, 2022;Kusumah et al, 2019;Hendriana et al, 2020;Rahmana et al, 2009;Chen et al, 2017;Blanc et al, 2010;Wikipedia., 2022;Kim, 2019;Povar et al, 2019;Wagman et al, 1982;Jiang et al, 2016;Di Blasi et al, 2014;Kabtamu et al, 2017;Tang et al, 2014;Liu et al, 2011;Richards et al, 2012) have not identified this spontaneous reaction. Further investigation is needed to mitigate this possible self-discharging reaction in VRFB.…”