Bi2S3 nanorod-stacked hollow microtubes self-assembled from bismuth-based metal–organic frameworks as advanced negative electrodes for hybrid supercapacitors

Abstract

Bismuth sulfide (Bi₂S₃) with a lamellar structure has emerged as a promising negative electrode material for supercapacitors (SCs) due to its high theoretical specific capacity. Meanwhile, the improvement of electrochemical properties strongly depends on the size, shape and morphologies of Bi₂S₃ nanomaterials. Herein, the hierarchical Bi₂S₃ nanorod-stacked hollow microtubes are self-assembled through a facile self-sacrificing template strategy from bismuth-based metal–organic framework microprisms. Benefiting from the unique structures with a large specific surface area (54.3 m² g⁻¹), the as-prepared Bi₂S₃ exhibits an ultrahigh specific capacity (532 C g⁻¹ at 1 A g⁻¹) as a negative electrode for SCs, outperforming other reported Bi₂S₃ materials.