121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-98
Subject Quantitative Analysis of Polybromide and Preparation of Simplified Zn-Br Battery System
Authors Joo-Hee Lim, KYUNGMI KIM, Junghyun Chae, Cheol-Woo Yi*
Department of Chemistry, Sungshin University, Korea
Abstract The zinc-bromine redox flow battery (RFB) using zinc-bromine redox couple has been received a great attention for a large-scale electrical energy storage (EES) system [1]. Even though Zn-Br RFB stores and releases a lot of electrical energy, the system is complicated. Moreover, the production of molecular bromine during operation of the system causes the self-discharge, corrosion of the system and so on. In order to reduce evolution of molecular bromine, various complexing agents have been significantly investigated [2, 3]. In this study, we prepared stable chemically complexed polybromide from the reaction of molecular bromine and quaternary ammonium bromide as complexing agents. Subsequently, we quantitatively analyzed the available bromine in the stable polybromide and prepared a simple electrochemical cell to obtain electrical energy from the polybromide in the complexed organic phase. We performed Raman spectroscopy to investigate the properties of prepared polybromide and attenuated total reflectance (ATR) spectroscopy was carried out with an internal standard to estimate the amount of available bromine in polybromide organic phase. The electrochemical cell is prepared without a separator and consists of zinc plate, graphite foil, polybromide as anode, cathode, and active material, respectively. The discharge capacities of the cell are 200 – 450 mAh/mL with stable polybromide, linearly correlating with the amount of available bromine in the polybromide organic phase. [References] [1] Wu, M.;Zhao, T.;Zhang, R.;Jiang, H.;Wei, L. Energy Technol., 2018, 6, 1. [2] Schneider, M.;Rajarathnam, G. P.;Easton, M. E.;Masters, A. F.;Maschmeyer, T.;Vassallo, A. RSC Adv., 2016, 6, 110548. [3] Easton, M. E.;Ward, A. J.;Chan, B.;Radom, L.;Masters, A. F.;Maschmeyer, T. Phys. Chem. Chem. Phys., 2016, 18, 7251.
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