Superior adsorption and photoinduced carries transfer behaviors of dandelion-shaped Bi2S3@MoS2: experiments and theory

Abstract

The enhanced light-harvesting capacity and effective separation of photogenerated carriers in fantastic hierarchical heterostructures enjoy striking attention for potential applications in the field of solar cells and photocatalysis. A three-dimensional (3D) dandelion-shaped hierarchical Bi2S3 microsphere compactly decorated with wing-shaped few layered MoS2 lamella (D-BM) was fabricated via a facile hydrothermal self-assembly process. Especially, polyethylene glycol (PEG) has been proven as the vital template to form D-BM microsphere. Importantly, the as-prepared D-BM microsphere presents pH-dependent superior adsorption behavior and remarkable visible light photocatalytic activity for degradation of organic dyestuffs (Rhodamine B/RhB and Methylene blue/MB), far exceeding those for the pure Bi2S3 and MoS2. It is understandable that D-BM with high surface area possesses more active sites and promotes light utilization due to the unique porous structure with outspread wings. Besides, based on the experiments and theoretical calculations, the staggered type II band alignment of D-BM permits the charge injection from Bi2S3 to MoS2, subsequently accelerates the separation and restrains the recombination of carriers, leading to excellent photocatalytic activity, as well as the photoconductance and photoresponse performance (with Ilight/Idark ratio 567).

Surface Sulfur Vacancy Engineering of Metal Sulfides Promoted Desorption of Hydrogen Atoms for Enhanced Electrocatalytic Hydrogen Evolution

“…Figure a and Figure b respectively show the microstructure of as-synthesized pristine MoS 2 and V2MoS 2 by SEM. While pristine MoS 2 exhibits a typical microstructure with agglomerated microspheres (diameter of ∼3–5 μm), , V2MoS 2 is characterized by a highly dispersed, flake-shaped nanostructure with a reduced particle size. A gradual evolution of the microstructure is observed upon increasing the HCl concentration during hydrothermal synthesis (Figure S1).…”

Bi2S3 Nanowires: First-Principles Phonon Dynamics and Their Photocatalytic Environmental Remediation

“…As an eco-friendly nanomaterial, bismuth sulfide (Bi 2 S 3 ) with a narrow band gap (∼1.3 eV) has been intensively studied due to its potential applications in many fields such as renewable energy, environmental remediation, and so forth. 1−4 Bi 2 S 3 nanostructures have been synthesized, exhibiting improved electrical transport properties, 5 photocatalytic environmental remediation, 6,7 and gas sensing characteristics. 8,9 However, almost all previous synthetic methods required complicated and expensive equipment and can only be used under limited conditions and induce impurities in the obtained products.…”

Photocatalytic degradation of ammonia-nitrogen via N-doped graphene/bismuth sulfide catalyst under near-infrared light irradiation

“…The Bi 2 S 3 lattice belongs to an orthogonal crystal line. It is anisotropic and easy to form crystal structures with high aspect ratio under suitable growth conditions [8] . Its synthetic products mainly include nanowire [9] , nanorods [10] , nanodisk [11] , etc.…”