Hierarchical WSe nanoflower as a cathode material for rechargeable Mg-ion batteries.

Transition metal dichalcogenides (TMDs) have emerged as a promising material in the energy field due to their unique structural arrangement. In this work, ordered flower-like WSe nanosheet was synthesized through simple one-step hydrothermal method, and its cathode application for rechargeable Mg-ion batteries was assessed. The WSe cathode exhibits a high reversible capacity above 265 mAh g at 50 mA g, excellent cycling life of 90% initial capacitance that can be ceaselessly harvested for 100 cycles at 50 mA g, and superior rate capability of 70% initial capacitance maintained even at the current density of 500 mA g. This work paves the way for the application of WSe cathode in Mg-ion and other rechargeable batteries.