Grafting and Solubilization of Redox‐Active Organic Materials for Aqueous Redox Flow Batteries

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Abstract
This study concerns the development of sustainable design strategies of aqueous electrolytes for redox flow batteries using redox‐active organic materials. A green spontaneous grafting reaction occurs between a redox‐active organic radical and an electrochemically activated structural modifier at room temperature through a simple mixing step. Then, a physical mixing method is used to formulate a structured aqueous electrolyte and enables aqueous solubilization of the organic solute from below 0.5 to 1.5 m beyond the conventional dissolution limit. The as‐obtained concentrated mixture can be readily used as catholyte for a redox flow battery. A record high discharge cell voltage (1.6 V onset output voltage) in aqueous non‐hybrid flow cell is attained by using the studied electrolytes.

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