Fabrication of Bi2Se3/Mo3Se4 composite for efficient sodium storage

In this work, the Bi2Se3/Mo3Se4 composite is obtained through electrochemical activation of Bi2Se3/MoSe2 composite, which has been synthesized by an ordinary hydrothermal reaction closely followed by selenization process. The Bi2Se3/Mo3Se4 composite appears good electrochemical property as the negative electrode material for sodium ion batteries (the stable reversible capacity is 409 (346) mAh g−1 at 100 (1000) mA g−1). The outstanding electrochemical property can be attributed to the unique Bi2Se3/Mo3Se4 composite architecture, in which Bi2Se3 is responsible for offering a high capacity, and Mo3Se4 is responsible for improving electrochemcial stability. Moreover, the small particle sizes for Bi2Se3/Mo3Se4 resulting from the amorphous to crystalline transitions during cycling is also the cause of the increased stability of the electrode. The design of the Bi2Se3/Mo3Se4 composite provides a potential tactics to construct other metal selenides composites for sodium-ion battery anode. © 2022 Elsevier B.V.