▎ 摘　　要

There has been increasing interest in aqueous Zn-ion batteries (ZIBs) because of their absolute safety, but it remains challenging to develop cathode materials with a high rate capability and cycling stability. Herein, we report a one-step strategy to construct a unique two-dimensional (2D) hierarchical structure of Mn2O3@graphene. Mn2O3 nanosheets are vertically grown on few-layered graphene via a fast one-step molten salts method. Benefiting from the unique 2D hierarchical structure with high electronic and ionic conductivity, as well as the synergetic effect between Mn2O3 and graphene, the Mn2O3@graphene here displays extraordinary electrochemical performance in ZIBs. In particular, it shows a record high reversible discharge capacity of 850.3 mA h g(-1) at a current density of 300 mA g(-1). Moreover, a high reversible capacity of 125 mA h g(-1) after 5000 cycles at a high current density of 7000 mA g(-1) (88.8 mA h g(-1) at 30000 mA g(-1)) can be achieved. These excellent electrochemical performances of Mn2O3@graphene are found to be superior to those of most electrode materials previously reported.