Study of Electrochemical stability of Anthraquinone derivative as Anolyte for Aqueous Redox Flow Batteries

Abstract

Energy storage systems that are both cost-effective and highly efficient are essential for supplying a steady power supply from renewable resources. Redox-active organic molecules immersed in aqueous electrolyte can store energy in aqueous organic redox flow battery, a possible energy storage technology. This method has drawn a lot of interest as cost-effective and safe substitute for pricey commercial redox flow battery system. Here, we demonstrated a novel anolyte 4-((1, 4-dihydroxy-9, 10-dioxo-9, 10-dihydroanthracen-2-yl) diazenyl) benzoic acid) having low molecular mass, highly soluble in an alkaline aqueous media. It has presented an appropriate charge-discharge capacity in an ambient setting when combined with potassium ferrocyanide as a catholyte achieving a cell potential of 1.05V. This study can pay focus on incorporating water functionalities of azo-based compound for a suitable voltage.  The designed anolyte has achieved columbic efficiency 75%, with an average decay rate of 0.02% about 200 cycles. These results have shown remarkable electrochemical stability, long-term storage capacity in future redox flow battery.