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Updated: May 21, 2025
A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
Published on: February 13, 2017
New Thermoelectricity Utilization System Based on Aqueous Organic Redox Flow Battery Involving the
Jinghua Huang1, Mingbao Huang1, Jinan Li1
1Guangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, P.R. China.
Abstract:
New energy technology is in urgent demand for waste heat harvesting and utilization for energy saving and renewable energy development. Herein, an aqueous organic redox flow battery (AORFB) with designed tripyridinium-triazine radicals ((TPyTz)··4+)/(TPyTz)·5+) as the negative redox couple is constructed as a thermoelectricity utilization system. The electrochemical test indicates that the (TPyTz)··4+/(TPyTz)·5+ couple shows an interesting potential change about 27 mV accompanied by system temperature varying from 298 K to 343 K. Nuclear magnetic resonance and electron paramagnetic resonance spectra approve that the population of high-energy (TPyTz)··4+ triplet state increases with temperature rise. This shifts the potential of the (TPyTz)··4+/(TPyTz)·5+ couple to a much more negative position. While the 2,2,6,6-tetramethylpiperidin-1-oxyl derivative (TPABPy)Cl3 is used as the positive electrolyte with no temperature-dependent potential change, the AORFB established by these two couples displays a thermally induced potential change from 1.39 V to 1.42 V.
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