Construction of a novel heterostructure of Bi₂S₃/Sb₂S₃ nanorod with improved sodium storage performances

In this study, a rod-like heterogeneous Bi₂S₃/Sb₂S₃ was systematically engineered through a simple one-step hydrothermal method and subsequently used as an anode active material for sodium-ion batteries (SIBs). The Bi₂S₃/Sb₂S₃ heterostructure electrode exhibits a high initial discharge capacity of 972.2 mAh g⁻¹ and maintains a reversible capacity of 369.4 mAh g⁻¹ after 500 cycles at a current density of 1 A g⁻¹. The outstanding electrochemical performance of the Bi₂S₃/Sb₂S₃ electrode can be attributed to the synergistic contributions of the high capacity of Sb₂S₃ and the excellent stability of Bi₂S₃. Simultaneously, the abundant heterogeneous phase boundaries formed by Bi₂S₃ and Sb₂S₃ provide stable reaction interfaces, better structural integrity, and enhanced Na⁺ reaction kinetics. This work presents an opportunity to develop heterogeneous Bi₂S₃/Sb₂S₃ anode materials with excellent properties, holding promise for potential applications in SIBs.