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Bi2S3 nanoparticles densely grown on electrospun-carbon-nanofibers as low-cost counter electrode for liquid-state solar cells
摘要： Dye-sensitized solar cells (DSSCs) counter electrode (CE) is needed to have both good electrical conductivity and high catalytic activity, and composite materials are better meet these two requirements. In this work, Bi2S3/carbon nanofiber (CNFs) composites are synthesized by simple electrospinning and hydrothermal methods, and after optimization of the content of Bi2S3, the large amount Bi2S3 nanoparticles are grown densely on CNFs without agglomeration. Bi2S3/CNFs composites are first introduced into DSSCs as CE. The optimized Bi2S3/CNFs composites are of great electrochemical performance and obtain a photoelectric conversion efficiency (PCE) of 7.64 %, which is better than common used Pt CE (7.12 %). Thus Bi2S3/CNFs CE has great prospects based on low cost and simple fabrication process to develop Pt-free CEs which could accelerate the large-scale application of DSSCs.
关键词： Counter electrode,Bi2S3 nanoparticles,Carbon nanofibers,Composite,Dye-sensitized solar cells
更新于2025-09-19 17:13:59
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Fabrication of Durable Ordered Ta2O5 Nanotube Arrays Decorated with Bi2S3 Quantum Dots
摘要： One of the most important challenges in the fabrication of ordered tantalum pentaoxide (Ta2O5) nanotube arrays (NTs) via the electrochemical method is the formation of nanotubes that adhere well to the Ta substrate. In this paper, we propose a new protocol that allows tight-fitting Ta2O5 nanotubes to be obtained through the anodic oxidation of tantalum foil. Moreover, to enhance their activity in the photocatalytic reaction, in this study, they have been decorated by nontoxic bismuth sulfide (Bi2S3) quantum dots (QDs) via a simple successive ionic layer adsorption and reaction (SILAR) method. Transmission electron microscopy (TEM) analysis revealed that quantum dots with a size in the range of 6–11 nm were located both inside and on the external surfaces of the Ta2O5 NTs. The effect of the anodization time and annealing conditions, as well as the effect of cycle numbers in the SILAR method, on the surface properties and photoactivity of Ta2O5 nanotubes and Bi2S3/Ta2O5 composites have been investigated. The Ta2O5 nanotubes decorated with Bi2S3 QDs exhibit high photocatalytic activity in the toluene degradation reaction, i.e., 99% of toluene (C0 = 200 ppm) was degraded after 5 min of UV-Vis irradiation. Therefore, the proposed anodic oxidation of tantalum (Ta) foil followed by SILAR decorating allows a photocatalytic surface, ready to use for pollutant degradation in the gas phase, to be obtained.
关键词： Bi2S3 quantum dots,ordered Ta2O5 nanotubes,heterogeneous photocatalysis
更新于2025-09-16 10:30:52
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WS2 quantum dots seeding in Bi2S3 nanotubes: A novel Vis-NIR light sensitive photocatalyst with low-resistance junction interface for CO2 reduction
摘要： Efficient photocatalysts sensitive to visible and near infrared lights have attracted increased concerns owing to the high utilization efficiency of solar energy. Herein, WS2 quantum dots (WS2 QDs) doped Bi2S3 nanotubes with smooth surface were constructed by seed-mediated strategy with WS2 QDs as seeds, which show sensitive response to Vis-NIR lights. In WS2@Bi2S3 structure, exposed S atoms in WS2 QDs combined Bi3+ ions to form Bi-S bonds, and enabled the S-sharing between WS2 and Bi2S3 unit cells. The perfect junction interface between WS2 and Bi2S3 is straight and smooth without any disordered atoms, endowing low resistance for fast electron transfer on the interface and efficient separation of electron-hole pairs. Compared with pristine Bi2S3 nanotubes, the WS2@Bi2S3 nanotubes display enhanced photocatalytic activity in CO2 reduction, with 38.2 μmol g-1 of methanol and 27.8 μmol g-1 of ethanol achieved at optimal WS2 loading content (4 wt%) under Vis-NIR light irradiation for 4 h. It is proposed that the low-resistance interface between WS2@Bi2S3 heterojunction and the regulated electron pathway along Bi2S3 nanotubes account for the high photocatalytic activity, which enables WS2@Bi2S3 a promising and unique photocatalyst, and indicates a new direction for light harvest.
关键词： WS2 quantum dots,Bi2S3 nanotube,photocatalytic reduction of CO2,seed-mediated,heterojunction interface
更新于2025-09-12 10:27:22
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Rapid Biofilm Elimination on Bone Implants Using Near‐Infrared‐Activated Inorganic Semiconductor Heterostructures
摘要： Bacterial infections often cause orthopedic surgery failures. It is hard for the immune system and antibiotics to clear bacteria adhered to implants after they form a mature biofilm, and a secondary surgery is required to remove the infected implants. To avoid this, a hybrid coating of Bi2S3@Ag3PO4/Ti is prepared to eliminate biofilm using near-infrared (NIR) light. Bi2S3 nanorod (NR) arrays are prepared on titanium (Ti) implants through hydrothermal methods, and Ag3PO4 nanoparticles (NPs) are loaded on Bi2S3 NR arrays using a stepwise electrostatic adsorption strategy. The introduction of Ag3PO4 NPs enhances the photocatalysis performances of Bi2S3, and the hybrid coating also exhibits good photothermal effects. After 808 nm light irradiation for 15 min, it shows superior bactericidal efficiency of 99.45% against Staphylococcus aureus, 99.74% against Escherichia coli in vitro, and 94.54% against S. aureus biofilm in vivo. Bi2S3@Ag3PO4/Ti also shows good cell viability compared to pure Ti. This NIR-activated-inorganic hybrid semiconductor heterojunction coating is biocompatible and could be employed to eliminate biofilm effectively, which makes it a very promising strategy for the surface modification of bone implant materials.
关键词： Bi2S3@Ag3PO4 nanorod arrays,biofilm elimination,bone implants,near-infrared photocatalysts,heterostructures
更新于2025-09-11 14:15:04
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Controlled Growth of BiSI Nanorod-Based Films Through a Two-Step Solution Process for Solar Cell Applications
摘要： Pb-based hybrid perovskite solar cells, despite their advantages, face challenges in commercialization. In recent years, Bi-based chalcohalides are being considered as potential alternative candidates, however, their current device efficiency remains unsatisfactory. Herein, a two-step solution method is developed and applied to the fabrication of BiSI films. The method consists of the formation of Bi2S3 (step I) and its conversion to BiSI (step II). The Bi2S3 was fabricated by a thiol-amine solution process and the BiSI conversion was achieved by chemical reaction between the as-formed Bi2S3 and BiI3. It was found that the formation of BiSI was highly dependent on the Bi:S molar ratio of the Bi2O3-thiourea solution and the number of times of step I. The as-fabricated BiSI film had an optical band gap of 1.61 eV and exhibited nanorod morphology. In addition, the electronic structure is explored and discussed for solar cells applications.
关键词： BiSI,bismuth chalcohalides,solution process,solar cells,thiol-amine,Bi2S3
更新于2025-09-11 14:15:04
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Optimization Algorithms of Neural Networks for Traditional Time-Domain Equalizer in Optical Communications
摘要： Herein we report an e?ective Ru(NH3)6 3+/Ru(NH3)6 2+-mediated photoelectrochemical-chemical-chemical (PECCC) redox cycling ampli?cation (RCA) strategy toward enhanced triple signal ampli?cation for advanced split-type PEC immunoassay application. Speci?cally, alkaline phosphatase (ALP) label was con?ned via a sandwich immunorecognition to convert 4-aminophenyl phosphate to the signal reporter 4-aminophenol (AP), which was then directed to interact with Ru(NH3)6 2+ as a redox mediator and tris (2-carboxyethyl) phosphine (TCEP) as reducing agent in the detection bu?er. Upon illumination, the system was then operated upon the oxidation of Ru(NH3)6 2+ by the photogenerated holes on the Bi2S3/BiVO4 photoelectrode, starting the chain reaction in which the Ru(NH3)6 2+ was regenerated by Ru(NH3)6 3+-enabled oxidization of AP to p-quinoneimine, which was simultaneously recovered by TCEP. Exempli?ed by interleukin-6 (IL-6) as the analyte, the Ru(NH3)6 3+/Ru(NH3)6 2+-mediated, AP-involved PECCC RCA coupled with ALP enzymatic ampli?cation could achieve triple signal ampli?cation toward the ultrasensitive PEC IL-6 immunoassay. This protocol can be extended as a general basis for other numerous targets of interest. Besides, we believe this work could o?er a new perspective for the further exploration of advanced RCA-based PEC bioanalysis.
关键词： photoelectrochemical-chemical-chemical (PECCC) redox cycling ampli?cation (RCA),triple signal ampli?cation,Bi2S3/BiVO4 photoelectrode,Ru(NH3)6 3+/Ru(NH3)6 2+-mediated,PEC immunoassay
更新于2025-09-11 14:15:04
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Precisely photothermal controlled releasing of antibacterial agent from Bi2S3 hollow microspheres triggered by NIR light for water sterilization
摘要： Microbial contamination in water has evoked worldwide attention owing to their greatest threats to the public safety. In this work, the sea urchin-like Bi2S3 hollow microspheres have been synthesized by a hard template-assisted polyol method using ZnS composite microspheres as sacri?ced template on the large scale, which shows good biocompatibility and photothermal conversion properties. Thermal-sensitive biocompatible 1-tetradecanol (TD) combined antibacterial agents (Linalool) were loaded into the hollow cavity of the sea urchin-like Bi2S3 hollow microspheres to form TD/Linalool@Bi2S3 composites. The Bi2S3 in the TD/Linalool@Bi2S3 composites can convert the absorbed NIR energy into heat energy under the irradiation of near infrared (NIR) light, which would make the temperature to reach the melting point of the TD and Linalool can be released at same time. Thus, the antibacterial agent Linalool can be precisely controlled releasing from the formed TD/Linalool@Bi2S3 composites, which provided rapid and e?ective killing outcome in vitro for Gram-negative Escherichia coli (E. coli) and Gram-positive Stahylococcus aureus (S. aureus). Additionally, the as-prepared TD/Linalool@Bi2S3 composites exhibited superior antibacterial ability as compared to antibacterial agent treatment or photothermal therapy (PTT) alone, which can be attributed to the synergistic e?ects of the NIR light driven photothermal killing and antibacterial agent releasing. It endowed that the designed TD/Linalool@Bi2S3 composites is a promising antibacterial platform for cleaning the microbial contaminated water environment, which is of great strategic signi?cance and remains a formidable challenge for practical applications.
关键词： Water sterilization,Bi2S3 hollow microspheres,Antibacterial,NIR light responsive,Precisely controlled delivery
更新于2025-09-11 14:15:04
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MoS2/Bi2S3 heterojunctions-decorated carbon-fiber cloth as flexible and filter-membrane-shaped photocatalyst for the efficient degradation of flowing wastewater
摘要： Traditional powder/film-shaped photocatalysts suffer some serious limitations (such as recycling difficulty or high-cost) in the degradation of flowing wastewater. Herein, we report a novel filter-membrane-shaped photocatalyst by constructing MoS2/Bi2S3 heterojunctions on carbon-fiber cloth (CF/MoS2/Bi2S3 cloth). CF/MoS2/Bi2S3 cloth consists of carbon-fibers (diameter: ~ 15 μm) which are decorated with numerous MoS2 nanosheets (thickness: ~ 2 nm) and Bi2S3 nanorods (length: 500 ~ 600 nm), and it exhibits a broad-spectrum photoabsorption from ultraviolet to near-infrared region (> 1200 nm). Under visible-light irradiation, CF/MoS2/Bi2S3 cloth (area: 4 × 4 cm2) exhibits the highest photocurrent (~ 1.44 mA cm-2) and can photocatalytically remove 95.1% rhodamine B (RhB), 91.8% methylene blue (MB), 74.5% tetracycline (TC) and 75.5% hexavalent chromium (Cr(VI)) after 100 min, better than those by CF/MoS2 cloth (37.0% RhB, 39.9% MB, 29.6% TC, 21.6% Cr(VI)) and CF/Bi2S3 cloth (26.9% RhB, 27.4% MB, 20.9% TC, 25.9% Cr(VI)). Importantly, when flexible CF/MoS2/Bi2S3 cloth (diameter: 10 cm) is used as the filter-membrane to degrade the flowing wastewater (rate: ~ 1 L h-1), the removal efficiency of RhB increases from 19.7% at 1st to 94.6% at 8th filtering/degrading grade. Thus, CF/MoS2/Bi2S3 cloth has excellent potential as a novel filter-membrane-shaped photocatalyst to degrade the flowing wastewater.
关键词： MoS2/Bi2S3,carbon-fiber cloth,flowing wastewater,filter-membrane,photocatalysis
更新于2025-09-11 14:15:04
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Exfoliation behavior of van der Waals strings: case study of Bi <sub/>2</sub> S <sub/>3</sub>
摘要： The family of crystals constituting covalently bound strings, held together by van der Waals forces, can be exfoliated into smaller entities, similar to crystals made of van der Waals sheets. Depending on the anisotropy of such crystals, and the spacing between their strings in each direction, van der Waals sheets or ribbons can be obtained after the exfoliation process. In this work, we demonstrate that ultra-thin nanoribbons of bismuth sulfide (Bi2S3) can be synthesized via a high power sonication process. The thickness and width of these ribbons are governed by the van der Waals spacings around the strings within the parent crystal. The lengths of the nanoribbons are initially limited by the dimensions of the starting bulk particles. Interestingly, these nanoribbons change stoichiometry, composition and are elongated when the duration of agitation increases, due to Ostwald ripening. An application of the exfoliated van der Waals strings is presented for optical biosensing using photoluminescence of Bi2S3 nanoribbons, reaching detection limits of less than 10 nM L-1 in response to bovine serum albumin. The concept of exfoliating van der Waals strings could be extended to a large class of crystals for creating bodies ranging from sheets to strings, with optoelectronic properties different from that of their bulk counterparts.
关键词： bio-sensing,photo luminescence,van der Waals strings,bismuth sulfide,liquid phase exfoliation,Bi2S3,Ostwald ripening
更新于2025-09-10 09:29:36
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The synthesis of Bi2S3/2D-Bi2WO6 composite materials with enhanced photocatalytic activities
摘要： Bi2S3/2D-Bi2WO6 composite materials which combined 2D-Bi2WO6 with Bi2S3 nanoparticles were prepared via ion exchange method. The mass ratio of Bi2S3 nanoparticle could be modulated by changing the quantity of thioacetamide (TAA). For Bi2S3/2D-Bi2WO6 composite materials, Bi2S3 nanoparticles dispersed on the surface of Bi2WO6 nanosheets. The photocatalytic activity was evaluated by photodegradation rhodamine B (RhB) under visible light. RhB was photodegraded nearly completely by BWS-2, while only 67% was photodegraded by Bi2WO6 nanosheet after 5 hours’ visible light irradiation. Based on the optical and electrochemical measurements, Bi2S3/2D-Bi2WO6 composite materials have prolonged carriers’ lifetime, improved carriers’ separation efficiency and decreased carriers’ recombination efficiency. These results endow Bi2S3/2D-Bi2WO6 composite materials with high photocatalytic activities.
关键词： Bi2S3/2D-Bi2WO6,ion exchange method,photocatalytic activities,visible light,composite materials
更新于2025-09-10 09:29:36