Sacrificial-template-free synthesis of core-shell C@BiS heterostructures for efficient supercapacitor and H production applications.

Core-shell heterostructures have attracted considerable attention owing to their unique properties and broad range of applications in lithium ion batteries, supercapacitors, and catalysis. Conversely, the effective synthesis of BiS nanorod core@ amorphous carbon shell heterostructure remains an important challenge. In this study, C@BiS core-shell heterostructures with enhanced supercapacitor performance were synthesized via sacrificial- template-free one-pot-synthesis method. The highest specific capacities of the C@BiS core shell was 333.43 F g at a current density of 1 A g. Core-shell-structured C@BiS exhibits 1.86 times higher photocatalytic H production than the pristine BiS under simulated solar light irradiation. This core-shell feature of C@BiS provides efficient charge separation and transfer owing to the formed heterojunction and a short radial transfer path, thus efficiently diminishing the charge recombination; it also facilitates plenty of active sites for the hydrogen evolution reaction owing to its mesoporous nature. These outcomes will open opportunities for developing low-cost and noble-metal-free efficient electrode materials for water splitting and supercapacitor applications.