Selenide-doped bismuth sulfides (Bi2S3-xSex) and their hierarchical heterostructure with ReS2for sodium/potassium-ion batteries.

ABSTRACT

In this work, selenide-doped bismuth sulfides (Bi2S3-xSex) 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 Bi2S3-xSex to form a hierarchical heterostructure (Bi2S3-xSex@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.