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Article Abstract
Halogen redox couples offer distinct merits due to high redox potential and low cost, but they usually suffer from poor reversibility. Here, we report highly reversible [BrCl]/Br and [BrCl]/Cl redox couples via harnessing interhalogen chemistry within nanoporous Ketjenblack (KB) carbon as a host for zinc-based aqueous batteries. The tunable halogen reactions are facilitated by controllable coordinating chemistry of [ZnClBr] in a hydrated deep eutectic solvent electrolyte comprising ZnCl, ZnBr, and choline chloride (CHClNO). In an optimized electrolyte, the KB electrode delivers a high discharge capacity of 535 mAh g or 214 mAh g when the stored [BrCl] is counted at 100 mA g, with an average discharge voltage of ~1.6 V, and a record high energy density of 788 Wh kg or 315 Wh kg, when considering the mass of [BrCl] as well. Benefiting from the interhalogen coordination chemistry and KB pore host, the pouch cell delivers an areal capacity of 2.3 mAh cm at 0.5 mA cm, storing an energy density of ~80 Wh kg based on the mass of both electrodes. This work offers a new strategy to enhance the reversibility of static aqueous halogen batteries for energy storage applications.
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