ADVANCED FUNCTIONAL MATERIALS
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2020
·Vol. 30
·期 16
·1910732
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IF 16.836
Liang Cao,Xinghui Liang,Xing Ou,Xianfeng Yang,Yangzhong Li,Chenghao Yang,Zhang Lin,Meilin Liu
Regulating nanocrystal composition with multiphase compounds is considered an efficient approach to enhance electrochemical performance and structure stability. Nevertheless, the thorough understanding of significant reaction mechanisms and insight into the reason of enhanced performance is still urgent. In this work, the bimetallic sulfide Bi 2 S 3 /MoS 2 heterogeneous with abundant phase boundaries is successfully fabricated. The in situ investigation of Na + -storage mechanism confirms that enormous phase boundaries are self-generated by composition optimization and rational structural design. More importantly, the full understanding of abundant phase boundaries on the enhanced electrochemical properties is explicitly unraveled by combining theoretical analysis and experimental results. It confirms that the interior self-built-in electric-field induced by phase boundaries can enhance the reaction kinetics and boost the charge transfer. Besides, the Bi/Na 2 S interface is well-maintained by the homogeneously distributed phase boundaries, effectively improving the conversion/alloying reversibility and keeping integrity without agglomeration and pulverization. As expected, the Bi 2 S 3 /MoS 2 composite exhibits superior rate capability and long-cycling stability (323.4 mAh g −1 after long-term 1200 cycles at ultrahigh rate of 10 A g −1 ). This strategy of constructing sufficient phase boundaries sheds light on the enhancement of reversibility and stability for other advanced conversion/alloying-type anode materials.
研究领域:
材料科学
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电化学
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储能
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纳米材料
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电池技术
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Long-Gui Peng,Hui Wang,Jun Liu,Meng Sun,Fu-Rong Ni,Meng-Jie Chang,Hui-Ling Du,Jie Yang
A novel fibrous BiVO 4 /Bi 2 S 3 /MoS 2 heterojunction is facilely constructed by simple electrospinning and hydrothermal processes. Bi 2 S 3 was formed concurrently along with the hydrothermal synthesis of MoS 2 on to the porous structure of BiVO 4 fibers. The BiVO 4 /Bi 2 S 3 /MoS 2 (BBM) heterojunction is organized with MoS 2 nanosheets of several layers in thickness encapsulating both on the Bi 2 S 3 nanorod around 40 nm in diameter and fibrous BiVO 4 template. The BiVO 4 /Bi 2 S 3 /MoS 2 heterojunction shows significant enhancement of visible light absorption in the region of 500–800 nm and photocurrent of 3 times higher than that of pure BiVO 4 . By adjusting the precursor concentration of MoS 2 , the optimized BBM-2 sample presents 4.9 and 9.5 times higher of the photodegradation efficiency and apparent reaction rate constant respectively, than that of pure BiVO 4 fibers after 120 min under visible light irradiation . The present work will provide a new strategy to the design of Bi-contained nanofibrous heterojunctions with high photocatalytic activity for the applications in energy storage and conversion.
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DOI
高影响因子
ACS Applied Nano Materials
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2023
·
IF 5.9
Li Liu,Yang Gao,Qinghua Hu
Constructing heterogeneous interfaces on a nanoscale that can prominently improve the gas-sensing properties has been comprehensively reported. However, the effect of parallel heterostructures formed by unique synthetic means on nitrogen dioxide room-temperature sensing properties still needs to be clarified, which hinders the development of heterostructured hybrid materials in the field of gas sensing. In this study, large-sized MoS2 was parallel-wrapped on the surface of nanoscale Bi2S3 rods, and then, the Bi2S3/MoS2 nanocomposite aerogels were formed by freeze drying and calcination. The NO2 sensing performance of the hybrids and possible surface processes at room temperature have been investigated and deduced. The as-prepared nanocomposite aerogels (Bi2S3/MoS2-2) exhibited a larger specific surface area, a mass of active defect sites, and a higher charge density, thus possessing 15- and 20-times higher response than that of pristine MoS2 nanosheets and Bi2S3 nanorods, respectively. This study provides an efficient way to synthesize large-area parallel heterostructures between two bis-sulfides (Bi2S3 and MoS2), leading to excellent NO2 gas sensing performance.
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DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Dan Han,Wei Mo,Ning Yang,Lei Zuo,Qinghua Sun,Xianghua Zeng
Two-dimensional Bi2S3 is considered a better photocatalyst when combined with CdS. To deeply understand electronic structures between CdS and Bi2S3, CdS@Bi2S3 core–shell nanorods (NRs) were synthesized with a two-step hydrothermal method, and CdS@Bi2S3–MoS2 composites were obtained with MoS2 nanoparticles decorated on the surface of CdS@Bi2S3 NRs. Then, the energy band alignments in CdS@Bi2S3–MoS2 were constructed from XPS and UPS measurements, and dual z-scheme CdS@Bi2S3–MoS2 heterostructures were confirmed from charge transfer with electron spin resonance (ESR) signals of •O2– and •OH. Finally, the photocatalytic hydrogen activities were carried out with the prepared samples. The results showed that the optimized CdS@Bi2S3 core–shell NRs have a hydrogen production rate of 4.29 mmol·h–1·g–1, which is 8.4 times higher than that of the pure CdS nanorods, and the optimized CdS@Bi2S3–MoS2 heterostructure has a hydrogen production rate of 8.72 mmol·h–1·g–1, which is 17 times higher than that of the pure CdS NRs. The enhanced photocatalytic activity can be ascribed to the dual z-scheme heterostructure and full-spectrum absorption; the former is favorable for the efficient separation of the photogenerated electron–hole pairs, and the latter is beneficial to the production of more photogenerated carriers. The studies will be helpful to understand the electronic structures of Bi2S3 and the related heterostructures.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 20
·17688-17702
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IF 2.22
Liu Jun,Hui Qian,Chang Meng-Jie,Cui Wen-Na,Xi Tong,Wang Lin-Da,Sun Meng,Yuan Bin,Ni Fu-Rong
Herein, novel fibrous Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 is constructed by a simple one-step methodology for photocatalytic degradation of RhB dyes. Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 hybrid fibers were facilely prepared by direct hydrothermal growth of MoS 2 nanosheets on electrospun Bi 4 Ti 3 O 12 nanofiber surface, during which rod-like Bi 2 S 3 was formed by in-situ ion exchange reaction between BTO and S source. The MoS 2 nanosheets with several-layer thickness uniformly are coated both on the BTO and Bi 2 S 3 surface. Remarkable enhancement of visible light absorption and photo-generated charge separation in Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 are achieved compared with the bare BTO nanofibers. By changing the weight ratio of Mo/S and the precursor dosage of MoS 2 , the optimized BM-150/250 sample presents 2.3 and 4.1 times higher of the photodegradation efficiency and apparent reaction rate constant, respectively, than that of pure BTO fibers after 120-min irradiation under visible light. The system pays an efficient pathway to establish ternary composite fibers providing high photocatalytic activity for other electrospun Bi-contained nanofibers.
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高影响因子
Biomaterials Science
·
2024
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IF 5.8
Yuhong Guo,Binbin Guo,Zhaopeng Liu,Jian Li,Liming Gao,Hong Jiang,Jidong Wang
A novel photoelectrochemical (PEC) cytosensor for the ultrasensitive detection of circulating tumor cells (CTCs) was developed. The bio-inspired reduced graphene oxide (rGO) honeycomb film photoelectrode was fabricated via a “breath figure” method, followed by the self-assembly of a Bi2S3–MoS2 heterojunction. The resulting Bi2S3–MoS2 heterojunction-modified rGO honeycomb film was employed as a sensing matrix for the first time. Compared to the smooth rGO film, the significant enhanced photocurrent of the photoelectrode under visible light was attributed to its improved visible light absorption, increased surface area and enhanced separation efficiency of photo-generated electron–hole pairs, which met the requirements of the PEC sensor for detecting larger targets. By virtue of the photocurrent decrease due to the steric hindrance of MCF-7 cells, which were captured by an aptamer immobilized on the surface of the photoelectrode, a cytosensor for detecting CTCs was achieved, showing a wide linear range of 10–1 × 105 cells per mL and a low detection limit of 2 cells per mL. Furthermore, MCF-7 cells in human serum were determined by this PEC biosensor, exhibiting great potential in the clinical detection of CTCs.
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DOI
PubMed
高影响因子
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