High Specific Capacity and Mechanism of Mof-73 Based Cathode for Aqueous Zinc-Ion Batteries

Rechargeable aqueous zinc-ion batteries (AZIBs) are promising devices for large-scale energy storages due to their high safety and low cost. Up to now, many cathode materials have been reported for AZIBs. Nevertheless, existing cathode materials still suffer from their limited specific capacity and unsatisfied cycle performance. In this work, a Mn-based metal-organic framework (MOF), MOF-73, is studied as a novel cathode for AZIBs for the first time, in particular, their electrochemical behaviours and zinc storage mechanism are investigated in detail. Results show MOF-73 possesses a high capacity with a voltage plateau ~1.47 V and can induce deposition of manganese ion to form manganese based compounds, which can co-contribute a high-specific capacity of 875 mA h g -1 . This work sheds light on the electrochemical zinc storage behaviors of MOFs while holding great promise to explore novel promise MOFs as cathodes for AZIBs