CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yu Wang,Jing Feng,Zhen-Hua Ge
Bismuth sulfide-based thermoelectric materials have attracted considerable interest owing to their abundance of raw materials and non-toxicity. However, their poor electrical properties, particularly their conductivity, have limited their practical applications. In this work, a melting method and spark plasma sintering were employed to synthesize bulk Bi 2 S 3 materials. The dopant MoCl 5 was used to regulate the electrical properties of Bi 2 S 3 . The results showed that Mo can significantly enhance the conductivity of Bi 2 S 3 compared to other transition metals. The doped sample exhibited an almost two-orders-of-magnitude rise in conductivity relative to the Bi 2 S 3 sample in its pure form. Due to its superior conductivity, the Bi 2 S 3 +1 wt% MoCl5 sample achieved an excellent power factor of 550 μW m −1 K −1 which is the maximum ever reported in the Bi 2 S 3 system. Simultaneously, the ZT value of this sample approached 0.70 at 773 K, which is a six-fold improvement compared to the pristine sample. Density functional theory was applied to understand the electronic structure changes of the Mo-doped sample, which revealed that trace amounts of MoCl 5 doping could significantly boost the density of states in the vicinity of the conduction band and shift the Fermi level to the valence band, leading to a reduction in the bandgap and an increase in free electrons. This work offers new insights into the role of Mo elements in thermoelectric materials and provides a good strategy for augmenting the thermoelectric figures of merit of other n-type thermoelectric materials with inadequate electrical conductivity in the future.
研究领域:
材料科学
·
热电材料
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yi Ma,Pan Lv,Fang Duan,Jialiang Sheng,Shuanglong Lu,Han Zhu,Mingliang Du,Mingqing Chen
Reasonable design of heterojunctions is considered to be an effective way to construct highly efficient photocatalysts . In this work, Bi 2 S 3 /BiFeO 3 heterojunction nanofibers with tightly integrated interface were prepared by electrospinning technique and in-situ anion exchange method. Various characterizations were conducted to analyze the structure and morphology of Bi 2 S 3 /BiFeO 3 composites. The photocatalytic activities of the obtained Bi 2 S 3 /BiFeO 3 heterojunctions were evaluated by photodegradation of tetracycline hydrochloride (TC) under visible light irradiation. It can be found that Bi 2 S 3 /BiFeO 3 heterojunctions showed enhanced photocatalytic degradation performance, and their photocatalytic activities can be easily optimized by changing the amount of thioacetamide (TAA). When the amount of TAA was 0.1 mmol, the obtained Bi 2 S 3 /BiFeO 3 (TAA-2) sample exhibited the best photocatalytic performance, which was 5 and 6 times of pure BiFeO 3 and Bi 2 S 3 , respectively. Besides, the photocatalytic mechanism was systematically studied by monitoring the active species and radicals, and by performing the optical and photoelectrochemical tests. Accordingly, a direct Z-scheme charge migration mechanism for Bi 2 S 3 /BiFeO 3 heterojunctions was proposed. The enhanced photocatalytic performance of Bi 2 S 3 /BiFeO 3 heterojunctions can be attributed to the improved visible light response and efficient charge separation and transfer.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 8
·891
·
IF 2.654
Deqiang Zhao,Wenwen Wang,Wenjuan Zong,Shimin Xiong,Qian Zhang,Fangying Ji,Xuan Xu
The band gaps of bismuth vanadate (BiVO4) and bismuth sulfide (Bi2S3) are about 2.40 eV and 1.30 eV, respectively. Although both BiVO4and Bi2S3are capable of strong visible light absorption, electron–hole recombination occurs easily. To solve this problem, we designed a one-step hydrothermal method for synthesizing a Bismuth sulfide (Bi2S3)/Bismuth vanadate (BiVO4) heterojunction using polyvinylpyrrolidone K-30 (PVP) as a structure-directing agent, and 2-Amino-3-mercaptopropanoic acid (l-cysteine) as a sulfur source. The pH of the reaction solution was regulated to yield different products: when the pH was 7.5, only monoclinic BiVO4was produced (sample 7.5); when the pH was 8.0 or 8.5, both Bi2S3and BiVO4were produced (samples 8.0 and 8.5); and when the pH was 9.0, only Bi2S3was produced (sample 9.0). In sample 8.0, Bi2S3and BiVO4were closely integrated with each other, with Bi2S3particles formed on the surface of concentric BiVO4layers, but the two compounds grew separately in a pH solution of 8.5. Visible-light photocatalytic degradation experiments demonstrated that the degradation efficiency of the Bi2S3/BiVO4heterojunction was highest when prepared under a pH of 8.0. The initial rhodamine B in the solution (5 mg/L) was completely degraded within three hours. Recycling experiments verified the high stability of Bi2S3/BiVO4. The synthesis method proposed in this paper is expected to enable large-scale and practical use of Bi2S3/BiVO4.Keywords:heterojunction;photocatalysis;hydrothermal method;bismuth vanadate;bismuth sulfide;pH value
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Wei Jin,Shenghai Yang,Chaobo Tang,Yun Li,Cong Chang,Yongming Chen
Traditional bismuthinite concentrate precipitation smelting has problems of low recovery of valuable metals (e.g., Bi, Cu, Mo, and Ag), high fuel consumption, and high cost of SO2 flue gas treatment. Therefore, in this study, an eco-friendly alkaline smelting process was proposed to extract metallic bismuth and recover valuable metals. The phase equilibrium composition of the Bi2S3-Na2CO3-C system was revealed by thermodynamic simulations at different temperatures and reductant contents. Based on reaction product characterizations and thermodynamic simulations, the following reaction mechanism and suitable bismuth extraction path were confirmed: Bi2S3 first reacted with Na2CO3 to form Bi2O3 and Na2S, and the intermediate (Bi2O3) was then reduced to metallic Bi by both C and CO. Under optimized conditions (Wbismuthinite/WNa2CO3/Wcoke = 200:300:20, 900 °C, 150 min), up to 96.56% Bi, 75.07% Pb, and 85.11% Ag were enriched in crude bismuth, respectively, while 93.57% Cu, 70.23% Fe, 96.63% Mo, and 94.34% W entered the salt slag. More than 99.9% W and Mo were recovered as Na2WO4 and Na2MoO4, respectively, from the salt slag by water leaching. In the leaching residue, chalcopyrite, pyrite, and elemental sulfur could be recovered by flotation.
研究领域:
冶金学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 30
·20512-20519
·
IF 3.9
Yang Shen,Baoqu Zhang,Zihan Yi,Lan Zhang,Jing Ling,Shibo Wang,Zhichao Sun,M. Zubair Iqbal,Xiangdong Kong
Catheter embolization is a minimally invasive technique that relies on embolic agents and is now widely used to treat various high-prevalence medical diseases. Embolic agents usually need to be combined with exogenous contrasts to visualize the embolotherapy process. However, the exogenous contrasts are quite simply washed away by blood flow, making it impossible to monitor the embolized location. To solve this problem, a series of sodium hyaluronate (SH) loaded with bismuth sulfide (Bi2S3) nanorods (NRs) microspheres (Bi2S3@SH) were prepared in this study by using 1,4-butaneglycol diglycidyl ether (BDDE) as a crosslinker through single-step microfluidics. Bi2S3@SH-1 microspheres showed the best performance among other prepared microspheres. The fabricated microspheres had uniform size and good dispersibility. Furthermore, the introduction of Bi2S3 NRs synthesized by a hydrothermal method as Computed Tomography (CT) contrast agents improved the mechanical properties of Bi2S3@SH-1 microspheres and endowed the microspheres with excellent X-ray impermeability. The blood compatibility and cytotoxicity test showed that the Bi2S3@SH-1 microspheres had good biocompatibility. In particular, the in vitro simulated embolization experiment results indicate that the Bi2S3@SH-1 microspheres had excellent embolization effect, especially for the small-sized blood vessels of 500–300 and 300 μm. The results showed the prepared Bi2S3@SH-1 microspheres have good biocompatibility and mechanical properties, as well as certain X-ray visibility and excellent embolization effects. We believe that the design and combination of this material has good guiding significance in the field of embolotherapy.
研究领域:
医学材料学
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介入放射学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chao Gu,Gang Liu,Xinmei Liu,Limin Dong,Dongbo Wang,Yuewu Huang,Jingzhou Zhang,Zhitao Yang,Mingyang Wu,Liancheng Zhao
In the present study, we report the growth of nanorod-shaped bismuth sulfide on the surface of layered graphene, forming a bismuth sulfide/graphene heterostructure. The distinctive architecture significantly amplifies its ion adsorption capacity, thereby endowing the material with outstanding electrochemical performance. The specific capacitance of the Bi 2 S 3 electrode is determined to be 232.1 C g −1 at a current density of 1 A g −1 . In contrast, the specific capacity could reach 528.9 C g −1 when Bi 2 S 3 is incorporated with graphene (Bi 2 S 3 /Gr-2). Furthermore, the Bi 2 S 3 /Gr-2 demonstrates an impressive cycling life retention rate of 85.5 % during a stability test of 10,000 cycles at a high current density (10 A g −1 ). In contrast, the pure Bi 2 S 3 only achieves a retention rate of 67.4 %. In a hybrid supercapacitor system, the positive electrode consists of Bi 2 S 3 /Gr, while activated carbon (AC) serves as the negative electrode. The optimal energy density values can reach up to 39.36 Wh kg −1 at a power density of 800.09 W kg −1 , while maintaining excellent stability with a capacity retention rate of 97.5 % after undergoing 10,000 cycles at high current density. This study emphasizes the importance of advanced electrode materials for electrochemical energy storage and the conclusions，which offer crucial insights into the development of metal sulfides/graphene composite materials and their electrochemical performance.
研究领域:
材料科学
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能源存储与转换
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产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
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IF 3.674
Xu Yan,Ziyang Wu,Peipei Yang,Yanli Mao,Biao Liu,Yong Zhao,Hao Shen,Dongliang Wang
In this article, novel Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction was synthesized by a facile ion-exchange method with thioacetamide as sulfur source. Multiple techniques were employed to analyze the structure and chemical composition of prepared samples. The photocatalytic performance of the Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction samples was investigated by the photodegradation of methyl orange under visible light. The Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction of S/BOI-2 sample presented the highest activity constant among all samples. Additionally, the photocatalytic mechanism is proposed according to the trapping experiments and electron spin resonance (ESR) results.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2017
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IF 7.504
Yidan Wang,Wei Tian,Liang Chen,Fengren Cao,Jun Guo,Liang Li
The rational design of semiconductor photoanodes with sufficient light absorption, efficient photogenerated carrier separation, and fast charge transport is crucial for photoelectrochemical (PEC) water splitting. Incorporating a small-band-gap semiconductor to a large-band-gap material with matched energy band position is a promising route to improve the light harvesting and charge transport. Herein, we report the fabrication of a three-dimensional heterojunction with uniform Bi2S3 nanorods on WO3 nanoplates by hydrothermal process and chemical bath deposition. The seed layer strategy was used to assist the growth of Bi2S3 nanorods for perfect interface contact between WO3 and Bi2S3. The as-prepared WO3/Bi2S3 composite exhibited a much enhanced photocurrent (5.95 mA/cm2 at 0.9 V vs reversible hydrogen electrode), which is 35 and 1.4 times higher than those of pristine WO3 and WO3/Bi2S3 composite without a seed layer, respectively. In addition, higher incident photon-to-current conversion efficiency (68.8%) and photoconversion efficiency (1.70%) were achieved. The enhancement mechanism was investigated in detail, and the sufficient light absorption, efficient charge transport, and high carrier density simultaneously contribute to the improved PEC activity. These findings will open up new opportunities to develop other highly efficient heterostructures as photoelectrodes for PEC applications.
研究领域:
材料科学
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能源科学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Shuai Wang,Weidong Xue,Yuan Fang,Yongqing Li,Liuliu Yan,Wenjian Wang,Rui Zhao
Oxygen evolution reaction (OER) is the key to achieve highly efficient hydrogen production during water splitting. Herein, flexible nanorods-integrated succulent-like Bi 2 S 3 /Ni 3 S 2 /NF heterostructure has been prepared by a facile solvothermal method and applied for OER. We highlight the unique nonequivalent sp 3 hybridization of P-region metal based sulfides, which makes a possibility of electronic inductive effect and enhanced electrocatalytic performance. The Bi 2 S 3 /Ni 3 S 2 /NF catalyst shows low overpotential 268 mV at 10 mA cm −2 and low Tafel slope of 82 mV dec −1 . Long-term stability evaluated at high current density suggests that succulent-like Bi 2 S 3 /Ni 3 S 2 could be a promising alternative to noble-metal based electrocatalysts for water oxidation reaction in alkaline medium.
研究领域:
材料科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2024
·
IF 7.6
Cuilu Xi,Jiang Xu,Haonan Chen,Jiawen Wang,Xinna Zhang,Yinyan Li,Gongxun Bai,Hui Xu,Zhen Xiao,Shiqing Xu
Among numerous polluting compounds, the organic dyes and antibiotics are two servious factors causing water pollution. Hence, it is urgent to find a fast and safe way to degrade waste water in a sustainable approach. Here, ferroelectric heterostructure based on 2D Bi 2 MoO 6 nanosheets and Bi 2 S 3 nanorods has been prepared by a two-step solvothermal method for the reduction of organic dyes and antibiotics. Due to the energy band balance between Bi 2 S 3 and Bi 2 MoO 6 , the formed type-II heterostructure can populate charge transfer at the junction and effectively inhibit electron-hole recombination. Under ultrasonic stimulation, catalytic active sites of a Bi 2 MoO 6 /Bi 2 S 3 heterostructure for pollutant degradation can be generated through rapid charge transfer activation, thus enhancing the catalytic degradation effect of organic dyes and antibiotics. The Bi 2 MoO 6 /Bi 2 S 3 heterostructure not only has good degradation effect, but also shows better stability. This work opens up new avenues for designing highly-efficient catalysts, which is of importance for wastewater degradation and energy-saving applications.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Peng Qin,Shun-Hui Liu,Chong-Yu Wang,Xin Kang,Fengdong Qu,Zhen-Hua Ge,Xuetao Gan
Bismuth sulfide (Bi2S3) has significant potential for gas sensing applications, but its performance is often limited by insufficient active surface sites and suboptimal response efficiency. This study aims to overcome these challenges by developing a halogen-doped Bi2S3 nanostructure sensor array for detecting key gases associated with food spoilage. Halogen doping (Cl, Br, and I) substantially enhances the electronic structure and surface activity of Bi2S3, improving both its selectivity and adsorption properties for target gases. Theoretical calculations reveal that halogen doping not only introduces primary adsorption sites on Bi2S3 nanomaterials but also facilitates electron transfer between gas molecules and the material. The sensor array exhibits excellent sensitivity and accuracy in detecting NH3, H2S, and CO gases, achieving an estimation error of only 0.8% for NH3 concentration when combined with machine learning algorithms. Furthermore, the array successfully distinguishes 18 different gas concentrations and classes, achieving a classification accuracy of 97.8%. The study also investigates the impact of humidity on sensor performance, revealing that Bi2S3–Cl nanorods maintain high NH3 adsorption properties under humid conditions. Practical application in beef freshness detection confirms the sensor array’s potential for real-world use, offering innovative solutions for food quality monitoring.
研究领域:
材料科学
·
食品科学
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Physics
·
2018
·Vol. 14
·期 1
·1-12
·
IF 1.892
Chen Ye,Wang Dongyang,Zhou Yuling,Pang Qiantao,Shao Jianwei,Wang Guangtao,Wang Jinfeng,Zhao Li-Dong
Recently, bismuth sulfide (Bi 2 S 3 ) has attracted much attention in the thermoelectric community owing to its abundance, low cost, and advanced properties. However, its poor electrical transport properties have prevented Bi 2 S 3 devices from realizing high thermoelectric performance. In this work, our motivation is to decrease the large electrical resistivity, which is recognized as the origin of the low ZT value in undoped Bi 2 S 3 . We combined melting and spark plasma sintering (SPS) in a continuous fabrication process to produce Bi 2 S 3- x Se x ( x = 0, 0.09, 0.15, 0.21) and Bi 2 S 2.85- y Se 0.15 Cl y ( y = 0.0015, 0.0045, 0.0075, 0.015, 0.03) samples. Our results show that Se alloying at S sites can narrow the band gap and activate intrinsic electron conduction, leading to a high power factor of ~ 2.0 μW·cm -1 ·K -2 cat room temperature in Bi 2 S 2.85 S 0.15 , about 100 times higher than that of undoped Bi 2 S 3 . Moreover, our further introduction of Cl atoms into the S sites resulted in a second-stage optimization of carrier concentration and simultaneously reduced the lattice thermal conductivity, which contributed to a high ZT value of ~ 0.6 at 723 K for Bi 2 S 2.835 Se 0.15 Cl 0.015 . Our results indicate that high thermoelectric performance could be realized in Bi 2 S 3 with earth-abundant and low-cost elements.
研究领域:
材料科学
·
热电学
·
固体物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）