Binding hierarchical MoSe2 on MOF-derived N-doped carbon dodecahedron for fast and durable sodium-ion storage

Molybdenum diselenide (MoSe 2 ) has drawn a lot of attention for high-performance sodium ion batteries (SIBs) as anode material, for its high theoretical capacity as well as large interlayer distance. Nevertheless, the low capacity and the poor cycling stability greatly hinder their application. Herein, a facile strategy to improve the storage performance of sodium was proposed by the in-situ growth of MoSe 2 on zeolitic imidazolate framework-8 (ZIF-8)-derived nitrogen doped porous carbon dodecahedron (MoSe 2 /N-PCD). The N-PCD can provide a fast electron transfer route for the MoSe 2 , and the robust interface between MoSe 2 and N-PCD can relief the structure changes of the electrode during the sodiation/desodiation. When used as an anode for SIBs, the prepared MoSe 2 /N-PCD electrode displays a large initial specific capacity of 464 mA h g −1 at 0.2 A g −1 , and the capacity maintains at 437 mA h g −1 after 500 cycles. Furthermore, at a high current density of 2 A g −1 , the electrode can still show a capacity of 223 mA h g −1 after 1000 cycles (capacity retention∼83%). This work demonstrates an effective way to prepare high performance MoSe 2 based anode materials for sodium-ion battery. Improved sodium-ion storage performance of MoSe 2 was demonstrated by assembling MoSe 2 nanosheets on MOF-derived N-doped carbon dodecahedron (N-PCD).