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Cu-doped Bi/Bi_(2)WO_(6) catalysts for efficient N_(2) fixation by photocatalysis

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1412-1422页

作者： Xiaojing Li chunran zhao Junfeng Wang Jiayu Zhang Ying Wu Yiming He Department of Materials Science and Engineering Zhejiang Normal UniversityJinhua 321004China Key Laboratory of Solid State Optoelectronic Devices of Zhejiang province Zhejiang Normal UniversityJinhua 321004China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China

In this paper,Cu-doped Bi_(2)WO_(6)was synthesized via a solvothermal method and applied it in photocatalytic N_(2)immobilization.Characterization results showed the presence of a small amount of metallic Bi in the photocatalyst,indicating that the synthesized photocatalyst is actually Bi/Cu-Bi_(2)WO_(6)composite.The doped Cu had a valence state of+2 and most likely substituted the position of Bi^(3+).The introduced Cu did not affect the metallic Bi content,but mainly influenced the energy band structure of Bi_(2)WO_(6).The band gap was slightly narrowed,the conduction band was elevated,and the work function was reduced.The reduced work function improved the transfer and separation of charge carriers,which mainly caused the increased photoactivity.The optimized NH_(3)generation rates of Bi/Cu-Bi_(2)WO_(6)reached 624 and 243μmol·L^(-1)·g^(-1)·h^(-1)under simulated solar and visible light,and these values were approximately 2.8 and 5.9 times higher those of Bi/Bi_(2)WO_(6),respectively.This research provides a method for improving the photocatalytic N_(2)fixation and may provide more information on the design and preparation of heteroatom-doped semiconductor photocatalysts for N_(2)-to-NH_(3)conversion.

关键词： Bi_(2)WO_(6) Cu doping work function photocatalytic N_(2)fixation charge separation

Decoration of CdMoO_(4) micron polyhedron with Pt nanoparticle and their enhanced photocatalytic performance in N_(2) fixation and water purification

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 1949-1961页

作者： Xujie Ren Junfeng Wang Shude Yuan chunran zhao Lin Yue Zhihao Zeng Yiming He Department of Materials Science and Engineering Zhejiang Normal UniversityJinhua 321004China Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province Zhejiang Normal UniversityJinhua 321004China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

This study aimed to prepare and apply a novel Pt/CdMoO_(4) composite photocatalyst for photocatalytic N2 fixation and tetracycline degradation. The Pt/CdMoO_(4) composite was subjected to comprehensive investigation on the morphology, structure, optical properties, and photoelectric chemical properties. The results demonstrate the dispersion of Pt nanoparticles on the CdMoO_(4) surface. Close contact between CdMoO_(4) and Pt was observed, resulting in the formation of a heterojunction structure at their contact region. Density functional theory calculation and Mott-Schottky analysis revealed that Pt possesses a higher work function value than CdMoO_(4), resulting in electron drift from CdMoO_(4) to Pt and the formation of a Schottky barrier. The presence of this barrier increases the separation efficiency of electron-hole pairs, thereby improving the performance of the Pt/CdMoO_(4) composite in photocatalysis. When exposed to simulated sunlight, the optimal Pt/CdMoO_(4) catalyst displayed a photocatalytic nitrogen fixation rate of 443.7 μmol·L‒^(1)·g‒^(1)·h‒^(1), which is 3.2 times higher than that of pure CdMoO_(4). In addition, the composite also exhibited excellent performance in tetracycline degradation, with hole and superoxide species identified as the primary reactive species. These findings offer practical insights into designing and synthesizing efficient photocatalysts for photocatalytic nitrogen fixation and antibiotics removal.

关键词： photocatalytic N2 fixation Pt CdMoO4 tetracycline degradation Schottky barrier

Facile preparation of Ag_(2)S/KTa_(0.5)Nb_(0.5)O_(3) heterojunction for enhanced performance in catalytic nitrogen fixation via photocatalysis and piezo-photocatalysis

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Green Energy & Environment 2023年第6期8卷 1630-1643页

作者： Lu Chen Junfeng Wang Xiaojing Li Jiayu Zhang chunran zhao Xin Hu Hongjun Lin Leihong zhao Ying Wu Yiming He Department of Materials Science and Engineering Zhejiang Normal UniversityYingbin Road 688Jinhua321004China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityYingbin Road 688Jinhua321004China College of Geography and Environmental Sciences Zhejiang Normal UniversityJinhua321004China

In this work, a novel heterojunction composite Ag_(2)S/KTa_(x)Nb_(1-x)O_(3)was designed and synthesized through a combination of hydrothermal and precipitation procedures. The Ta/Nb ratio of the KTa_(x)Nb_(1-x)O_(3)and the Ag_(2)S content were optimized. The best 0.5% Ag_(2)S/KTa_(0.5)Nb_(0.5)O_(3)(KTN) sample presents an enhanced photocatalytic performance in ammonia synthesis than KTN and Ag_(2)S. Under simulated sunlight, the NH_(3)generation rate of 0.5% Ag_(2)S/KTN reaches 2.0 times that of pure KTN. Under visible light, the reaction rate ratio of the two catalysts is 6.0.XRD, XPS, and TEM analysis revealed that Ag2S was intimately decorated on the KTN nanocubes surface, which promoted the electron transfer between the two semiconductors. The band structure investigation indicated that the Ag_(2)S/KTN heterojunction established a type-Ⅱ band alignment with intimate contact, thus realizing the effective transfer and separation of photogenerated carriers. The change in charge separation was considered as the main reason for the enhanced photocatalytic performance. Interestingly, the Ag_(2)S/KTN composite exhibited higher NH3generation performance under the combined action of ultrasonic vibration and simulated sunlight. The enhanced piezo-photocatalytic performance can be ascribed that the piezoelectric effect of KTN improved the bulk separation of charge carriers in KTN. This study not only provides a potential catalyst for photocatalytic nitrogen fixation but also shows new ideas for the design of highly efficient catalysts via semiconductor modification and external field coupling.

关键词： Photocatalytic nitrogen fixation Ag_(2)S/KTa_(0.5)Nb_(0.5)O_(3) Type-II heterojunction Piezo-photocatalysis Charge separation

One-step preparation of MoO_(x)/ZnS/ZnO composite and its excellent performance in piezocatalytic degradation of Rhodamine B under ultrasonic vibration

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Journal of Environmental Sciences 2023年第3期125卷 1-13页

作者： Song Zheng Xiaojing Li Jiayu Zhang Junfeng Wang chunran zhao Xin Hu Ying Wu Yiming He Department of Materials Science and Engineering Zhejiang Normal UniversityJinhua 321004China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China

This paper synthesized a new type of ternary piezoelectric catalyst MoO_(x)/ZnS/ZnO (MZZ)by a one-step method.The catalytic degradation of Rhodamine B (RhB) solution (10μg/g,pH=7.0) shows that the composite catalyst has excellent piezoelectric catalytic activity under ultrasonic vibration (40 k Hz).The piezoelectric degradation rate of the optimal sample reached 0.054 min^(-1),which was about 2.5 times that of pure ZnO.X-ray diffraction(XRD),X-ray photoelectron spectroscopy (XPS),Raman,transmission electron microscopy(TEM),scanning electron microscopy (SEM),and electrochemical impedance spectroscopy(EIS) technologies were used to analyze the structure,morphology,and interface charge transfer properties of the MZZ piezocatalysts.The results showed that the composite catalyst may have a core-shell structure.ZnS is coated on the surface of ZnO,while MoO_(x)adheres to the surface of ZnS.This structure endowed MZZ larger specific surface area than ZnO,which benefits the RhB adsorption.More importantly,the formed heterojunction structure between ZnS and ZnO promotes the separation of positive and negative charges induced by the piezoelectric effect.MoO_(x)species may act as a charge trap to further promote more carriers to participate in the reaction.In addition,MoO_(x)may also be beneficial in adsorbing dyes.Active species capture experiments show that superoxide radicals and holes are the main active species in piezoelectric catalytic reactions on MZZ catalysts.

关键词： ZnO ZnS MoO_(x) Piezocatalytic Rhodamine B Core-shell structure

Efficient preparation of a four-photon cluster state with homodyne measurement via cross-Kerr nonlinearity

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Science China(Physics,Mechanics & Astronomy) 2011年第3期54卷 479-483页

作者： zhao chunran YE Liu School of Physics & Materials Science Anhui University Hefei 230039 China School of Physics & Electronic Information Huaibei Normal University Huaibei 235000 China

A scheme is proposed for generating a multiphoton entangled cluster state among four modes. The scheme only uses Kerr medium, beam splitter and homodyne measurements on coherent light fields, which can be efficiently made in quantum optical laboratories. The photon in the signal mode is prepared in a superposition state of the vacuum state and one-photon state while the probe beam is initially set in a coherent state superposition. The strong probe mode interacts successively with multiple signal-mode photons, each causing a conditional phase rotation in the probe mode. Subsequent momentum quadrature homodyne measurement of the probe mode will project the photons in the signal mode into the desired entangled states. It is shown that under certain conditions, the four-photon cluster state can be generated with high fidelity and high success probability, and the scheme is feasible by current experimental technology.

关键词：测量模式 Kerr非线性多光子零差高效制备真空状态信号模式簇

Achieving 500X Acceleration for Adversarial Robustness Verification of Tree-Based Smart Grid Dynamic Security Assessment

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 800-802页

作者： Chao Ren chunran Zou Zehui Xiong Han Yu zhao-Yang Dong Niyato Dusit Nanyang Technological University Singapore 639798Singapore Nanjing University of Aeronautics and Astronautics Nanjing 211106China Singapore University of Technology and Design Singapore 487372Singapore

Dear Editor,This letter presents a novel and efficient adversarial robustness verification method for tree-based smart grid dynamic security assessment(DSA).Based on tree algorithms technique,the data-driven smart gri... 详细信息

关键词： Smart smart Dynamic

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碳纤维铝基复合材料制备及合金化研究现状

铸造技术 2024年第5期45卷 494-502页

作者：金瑛栋郝景莹赵春然董占远王成伟康烁杨玲玲董书琳李广龙沈阳工业大学材料科学与工程学院辽宁沈阳110870 抚顺煤矿电机制造有限责任公司辽宁抚顺113122 阳泉华盛矿用设备厂有限公司山西阳泉045008

碳纤维铝基复合材料具有优异的抗拉性能、耐磨性和抗疲劳性能等特点,广泛应用于飞行器、军工用品、汽车等领域。针对目前碳纤维铝基复合材料制备成形困难和界面结合性能差等问题,本文论述了近年来国内外各种碳纤维铝基复合材料制备工艺... 详细信息

碳纤维铝基复合材料具有优异的抗拉性能、耐磨性和抗疲劳性能等特点,广泛应用于飞行器、军工用品、汽车等领域。针对目前碳纤维铝基复合材料制备成形困难和界面结合性能差等问题,本文论述了近年来国内外各种碳纤维铝基复合材料制备工艺,分析了各种制备工艺的特点,总结了基体合金化对界面反应和润湿性的影响。同时,对碳纤维铝基复合材料的未来发展进行了展望。

关键词：铝基复合材料碳纤维制备工艺合金化

驱动场相位涨落对开放四能级系统的影响(英文)

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光子学报 2006年第10期35卷 1602-1607页

作者：朱孟正赵春然尹新国淮北煤炭师范学院物理系安徽淮北235000

考虑驱动场相位存在涨落,给出了开放四能级系统的稳态解析解,通过它分析了该系统由于驱动场相位涨落引起的有限线宽对增益、色散和粒子数差的影响.分析显示:线宽的变化不能改变无反转激光系统的特性;线宽的增大必须提高抽运阈值;相对来... 详细信息

考虑驱动场相位存在涨落,给出了开放四能级系统的稳态解析解,通过它分析了该系统由于驱动场相位涨落引起的有限线宽对增益、色散和粒子数差的影响.分析显示:线宽的变化不能改变无反转激光系统的特性;线宽的增大必须提高抽运阈值;相对来说退出速率很小时,线宽对增益、色散和粒子数差的影响较弱;当线宽不为零时该系统仍能获得无吸收高色散.

关键词：无反转激光开放系统相位涨落非相干抽运速率

纪念尼尔斯·玻尔获得诺贝尔物理学奖100周年

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物理通报 2023年第6期 153-156页

作者：张珍珍薛莉赵春然淮北师范大学物理与电子信息学院安徽淮北235000

100年前,丹麦科学家尼尔斯·玻尔由于对原子结构理论的贡献获得了诺贝尔物理学奖.在当前的教材中,对波尔的描述大都集中在玻尔模型上,但纵观玻尔的一生,就会发现玻尔留给后人的财富不仅在科研成就中,也在于他伟大的人格和精益求精的科... 详细信息

100年前,丹麦科学家尼尔斯·玻尔由于对原子结构理论的贡献获得了诺贝尔物理学奖.在当前的教材中,对波尔的描述大都集中在玻尔模型上,但纵观玻尔的一生,就会发现玻尔留给后人的财富不仅在科研成就中,也在于他伟大的人格和精益求精的科研精神.

关键词：物理学家物理学史诺贝尔物理学奖量子理论