Selenide-doped bismuth sulfides (Bi2S3-xSex) and their hierarchical heterostructure with ReS2for sodium/potassium-ion batteries
Jinyi Lin, Shengjun Lu, Yufei Zhang, Yufei Zhang, Lingxing Zeng, Yi Zhang, Yi Zhang, Haosen Fan
Abstract
In this work, selenide-doped bismuth sulfides (Bi 2 S 3-x Se x ) was successfully prepared through Se doping Bi 2 S 3 Se to improve the electronic conductivity and increase the interlayer spacing. Then the anisotropic ReS 2 nanosheet arrays were grown on the surface of Bi 2 S 3-x Se x to form a hierarchical heterostructure (Bi 2 S 3-x Se x @ReS 2 ). 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 .