Selenide-doped bismuth sulfides (Bi₂S_3-xSe_x) and their hierarchical heterostructure with ReS₂for sodium/potassium-ion batteries

In this work, selenide-doped bismuth sulfides (Bi₂S_3-xSe_x) was successfully prepared through Se doping Bi₂S₃ Se to improve the electronic conductivity and increase the interlayer spacing. Then the anisotropic ReS₂ nanosheet arrays were grown on the surface of Bi₂S_3-xSe_x to form a hierarchical heterostructure (Bi₂S_3-xSe_x@ReS₂). The doping and construction of heterostructure processes can greatly improve the electrochemical conductivity of electrode materials and relieve the volume expansion during the continuous charge/discharge processes. While applied as SIBs anode, the specific capacity of 330 mAh g^-1 was maintained after 450 cycles at the current density of 1.0 A g^-1. It can also keep 200 mAh g^-1 specific capacity after 900 cycles at 1.0 A g^-1 for the anode of PIBs. This heterogeneous engineering and doping dual strategies could provide a good idea for the synthesis of new bimetallic sulfides with outstanding battery performance for SIBs and PIBs.