Aqueous Zn–Mn flow batteries (Zn–Mn FBs) are a potential candidate for large-scale energy storage due to their high voltage, low cost, and environmental friendliness. However, the unsatisfactory performance due to the sluggish MnO 2 reduction reaction (MnRR) kinetics leads to low discharge voltage. . Recently, rechargeable aqueous zinc-based batteries using manganese oxide as the cathode (e. Despite their potential, achieving high energy density in Zn||MnO 2 batteries remains challenging. . A battery includes a cathode compartment, a catholyte solution disposed within the cathode compartment, an anode compartment, an anolyte solution disposed within the anode compartment, a separator disposed between the cathode compartment and the anode compartment, and a flow system configured to. . Zinc–manganese dioxide (Zn–MnO 2) batteries, pivotal in primary energy storage, face challenges in rechargeability due to cathode dissolution and anode corrosion. This review summarizes cathode-free designs using pH-optimized electrolytes and modified electrodes/current collectors. For. . Manganese dioxide (MnO 2), as a cathode material for AZIBs, has garnered significant interest owing to advantages such as the low cost of manganese, stable structure, simple synthesis process, and abundant raw materials. Additionally, it exhibits high specific capacity and tunable cycling. .
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