Mn-MOFs derived manganese-based oxide by regulating atmosphere as zinc-ion battery cathode

Manganese-based cathode materials have been widely developed and applied in aqueous zinc-ion batteries (ZIBs). Metal–organic frameworks exhibit remarkable advantages and promising application prospects in the realm of energy conversion and storage applications. Generating oxygen vacancies and nitrogen doping by calcining MOFs is an efficient approach to enhance the zinc storage capabilities of manganese oxides. Herein, δ-MnO₂ as the manganese source reacts with H₃BTC at room temperature to form Mn-MOF, and calcined in air and nitrogen atmospheres to create Mn₂O₃/CC-A and MnO/CC-N, respectively. At a current density of 0.2 A/g, MnO/CC-N has an average discharge specific capacity of 211 mAh/g, which capacity retention rate is 88.5%. Additionally, Mn₂O₃/CC-A and MnO/CC-N have good rate performance, as their specific capacity is higher than the initial specific capacity when the current density is restored to 0.2 A/g. This work provides an effective strategy for developing water-based zinc-ion batteries with high specific capacity and good stability.