CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Ye Zhang,Yiguo Xu,Jia Guo,Xiuwen Zhang,Xinling Liu,Yushuang Fu,Feng Zhang,Chunyang Ma,Zhe Shi,Rui Cao,Han Zhang
Mixed-dimensional van der Waals heterojunctions have attracted a great deal of attention due to their excellent photoelectric conversion capability, which have been widely applied for self-powered photoelectrochemical (PEC)-type devices as the growing demands of clean energy, environmental governance and protection, and the underwater communications. In this work, 0D Bismuth quantum dots (Bi QDs) encapsulated 2D g-C 3 N 4 nanosheets (g-C 3 N 4 @Bi) mixed-dimensional heterojunctions were prepared and spined on ITO-coated polyethylene terephthalate (PET) substrate for working as self-powered PEC-type photodetector (PD). Density functional theory calculations evidenced the successful construction of a type II van der Waals heterojunction between g-C 3 N 4 and Bi as well as its enhanced optoelectronic characteristics. Benefiting from the superior properties of g-C 3 N 4 @Bi, the as-prepared PD exhibits a high photocurrent of 5.02 μA cm −2 , a responsivity of 2843.14 μA W −1 , and a specific detectivity of 2.25 × 10 11 Jones at 0 V. Furthermore, the PD exhibits self-powered capability after 1000 cycles of bending, and the stable and repeatable ON/OFF signals can be detected over 90 days, indicating the excellent long-term stability and the potential of g-C 3 N 4 @Bi-based PD in practical applications.
研究领域:
材料科学
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光电子学
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能源与环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Jun Xiao,Weiyi Yang,Qi Li
Bi quantum dots were deposited onto rutile TiO 2 nanoparticles by a one-pot, solvent-thermal process to create the Bi/TiO 2 (rutile) heterojunction photocatalyst. Due to the specific semimetal property of Bi, a metal to semiconductor transition occurred for Bi quantum dots, which endowed them with the hole trapping capability to enhance the charge carrier separation in rutile TiO 2 and eliminate the need of sacrificial agents for the consumption of photogenerated holes in photocatalytic reduction process. The Bi/TiO 2 (rutile) heterojunction photocatalyst demonstrated an efficient photocatalytic bromate reduction under visible light illumination without the addition of sacrificial agents in the reaction solution, and it could be easily regenerated for reuse. Different with previously reported noble/transition metal modifications as the electron trapping center, this study demonstrated a novel material design strategy of the introduction of hole trapping centers to create photocatalysts with strong photocatalytic reduction capabilities, which could be readily adopted for a broad range of technical applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
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2020
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IF 6.289
Jing Wang,Kehui Xue,Ren He,Tianli Yang,Yi Peng,Ying Yan,Yuanlan Wang,Hui Wang,Wenlei Wang
It is imperative to find an environmentally friendly method to design photocatalysts for CO 2 reduction. In this work, ultrafine Bi 6 O 7 FCl 3 nanotubes were synthesized and used as a template to realize the reverse growth of Bi-quantum-dots at the interface of Bi@Bi 6 O 7 FCl 3 -X (X = 20/60/90) nanotube. The facile construction of the (012) plane on Bi quantum dots, with a diameter of approximately 2 nm, was achieved by electron beam irradiation. [Bi 6 O 7 ] 4+ cations and [Cl 4 ] 4− anions were first generated through the hydrothermal reaction, and the interaction between the anions and cations resulted in the [Bi 6 O 7 Cl 4 ] unit intermediate, in which the negatively charged [Cl 4 ] 4− separated the [Bi 6 O 7 ] 4+ layers from each other. In addition, F atoms, with a strong electronegativity, entered the [Cl 4 ] 4− layers, replacing a portion of the Cl atoms to form a new [FCl 3 ] 4− layer. The binding energy of Bi was reduced by 0.16 eV, as shown by the XPS results. The photocatalytic activity of Bi@Bi 6 O 7 FCl 3 -X (X = 20/60/90) was determined by the production of CO from CO 2 . After 4 h of monitoring, the CO production rate of Bi@Bi 6 O 7 FCl 3 –90 was 15.79 μmol·g −1 ·h −1 , which was 6.29 times that of Bi 6 O 7 FCl 3 . After 5 cycles, the CO production rate of Bi@Bi 6 O 7 FCl 3 -90 remained at approximately 61.07 μmol·g −1 .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC COMMUNICATIONS
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2024
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IF 1.8
Haiyan Xu,Yuanyuan Huang,Yinchun Liang,Nan Wang,Dejun Dong,Mengke Wang,Weichun Huang,You Zi,Zhanping Yang
Herein, we present an efficient synthesis method utilizing Bi quantum dots (QDs) as catalysts for the photochemical oxidative coupling of thiols to disulfides under mild conditions. The protocol offers low catalyst loading, simplicity in reaction setup as well as high efficiency. Aromatic thiols and aliphatic thiols are successfully transformed into disulfides with good to quantitative yields, demonstrating tolerance to various substituents and heterocycles. Additionally, the protocol extends to the synthesis of asymmetric disulfides and allows for gram-scale synthesis.
研究领域:
催化
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有机化学
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纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）