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

Abstract

Molybdenum diselenide (MoSe2) 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 MoSe2 on zeolitic imidazolate framework-8 (ZIF-8)-derived nitrogen doped porous carbon dodecahedron (MoSe2/N-PCD). The N-PCD can provide a fast electron transfer route for the MoSe2, and the robust interface between MoSe2 and N-PCD can relief the structure changes of the electrode during the sodiation/desodiation. When used as an anode for SIBs, the prepared MoSe2/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 MoSe2 based anode materials for sodium-ion battery.