Sacrificial-template-free synthesis of core-shell C@Bi2S3 heterostructures for efficient supercapacitor and H2 production applications

Abstract

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 Bi2S3 nanorod core@ amorphous carbon shell heterostructure remains an important challenge. In this study, C@Bi2S3 core-shell heterostructures with enhanced supercapacitor performance were synthesized via sacrificial- template-free one-pot-synthesis method. The highest specific capacities of the C@Bi2S3 core shell was 333.43 F g−1 at a current density of 1 A g−1. Core-shell-structured C@Bi2S3 exhibits 1.86 times higher photocatalytic H2 production than the pristine Bi2S3 under simulated solar light irradiation. This core-shell feature of C@Bi2S3 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.

Hydrogen production and photocatalytic activity of g‐C3N4/Co‐MOF (ZIF‐67) nanocomposite under visible light irradiation

“…The formed heterojunction interfaces are believed to make available the migration of photo‐induced h + to the ZIF‐67 by leaving the e − in the CB of g‐C 3 N 4 under visible light irradiation, which can be restraining the change of charge recombination and gather freer e − in the CB of g‐C 3 N 4. Generally, in the photocatalytic procedure, most of the photogenerated e − and h + will recombine inside the catalyst, and partial holes transferred to the catalyst surface will directly decompose dyes/react with the adsorbed H 2 O to produce (•OH) radicals to contribute in dye degradation . The remaining e − will react with O 2 to form • O 2 − and then react with protons to form HOO.…”

g-C3N4/CuO and g-C3N4/Co3O4 nanohybrid structures as efficient electrode materials in symmetric supercapacitors

“…2(a) at 575 cm À1 and 665 cm À1 , respectively. 12 The peak at 537 cm À1 in Fig. 2(b) is the stretching vibrational band of Cu-O bond in monoclinic CuO crystal.…”

“…However the pseudo capacitive behavior in transition metal oxides (TMO), sulphides and conducting polymers arises due to the fast and reversible redox process between the electroactive material and electrolyte molecule (faradaic process). [11][12][13][14][15] Thus TMO with pseudocapacitive nature can be suitably coupled with g-C 3 N 4 layer structure to mitigate the limitations of bare g-C 3 N 4 electrodes. 16 The commonly used transition metal oxides are ruthenium oxide, 17 manganese dioxide, 18 tungsten oxide, 19 nickel oxide, 20 etc.…”

Solar‐Inspired Water Purification Based on Emerging 2D Materials: Status and Challenges

“…2D V 2 O 5 including V 2 O 5 ‐based nanocomposite also had many reported on photocatalyst degradation fields . It usually has an orthorhombic crystal structure, consisting of a zigzag double chain of VO 5 cones based on a square, bonded to corner‐shared bridge oxygen atoms .…”