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Graphitic carbon nitride/antimonene van der Waals heterostructure with enhanced photocatalytic CO_(2) reduction activity

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Journal of Materials Science & Technology 2022年第21期116卷 192-198页

作者： jinfeng zhang Junwei Fu Kai Dai Key Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationHuaibei Normal UniversityHuaibei 235000China School of Physics and Electronics Central South UniversityChangsha 410083China

Photocatalytic reduction of CO_(2) into valuable fuels is one of the potential strategies to solve the carbon cycle and energy *** carbon nitride(g-C_(3)N_(4)),as a typical two-dimensional(2D)semiconductor with a bandgap of∼2.7 eV,has attracted wide attention in photocatalytic CO_(2) ***,the performance of g-C_(3)N_(4) is greatly limited by the rapid recombination of photogenerated charge carriers and weak CO_(2) activation *** of van der Waals heterostructure with the maximum interface contact area can improve the transfer/seperation efficiency of interface charge *** metal antimony(Sb)nanosheet(antimonene)with high carrier mobility and 2D layered structure,is a good candidate material to construct 2D/2D Sb/g-C_(3)N_(4) van der Waals *** this work,the density functional theory(DFT)calculations indicated that antimonene has higher carrier mobility than g-C_(3)N_(4) *** charge transfer and in-plane structure distortion will occur at the interface of Sb/g-C_(3)N_(4),which endow stronger CO_(2) activation ability on di-coordinated N active *** ultrathin g-C_(3)N_(4) and antimonene nanosheets were prepared by ultrasonic exfoliation method,and Sb/g-C_(3)N_(4) van der Waals heterostructures were constructed by self-assembly *** photoluminescence(PL)and time-resolved photoluminescence(TRPL)indicated that the Sb/g-C_(3)N_(4) van der Waals heterostructures have a better photogenerated charge separation efficiency than pure g-C_(3)N_(4) ***-situ FTIR spectroscopy demonstrated a stronger ability of CO_(2) activation to^ (∗)COOH on Sb/g-C_(3)N_(4) van der Waals *** a result,the Sb/g-C_(3)N_(4) van der Waals heterostructures showed a higher CO yield with 2.03 umol g^(−1) h^(−1),which is 3.2 times that of pure g-C_(3)N_(4).This work provides a reference for activating CO_(2) and promoting CO_(2) reduction by van der Waals heterostructure.

关键词： Photocatalysis Carbon nitride Antimonene Van der Waals heterostructure CO_(2)activation

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A Singular Value Thresholding Based Matrix Completion Method for DOA Estimation in Nonuniform Noise

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Journal of Beijing Institute of Technology 2021年第4期30卷 368-376页

作者： Peiling Wang jinfeng zhang School of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China

Usually,the problem of direction-of-arrival(DOA)estimation is performed based on the assumption of uniform *** many applications,however,the noise across the array may be *** this situation,the performance of DOA estimators may be deteriorated greatly if the non-uniformity of noise is *** tackle this problem,we consider the problem of DOA es-timation in the presence of nonuniform noise by leveraging a singular value thresholding(SVT)based matrix completion *** from that the traditional SVT method apply fixed threshold,to improve the performance,the proposed method can obtain a more suitable threshold based on careful estimation of the signal-to-noise ratio(SNR)***,we firstly employ an SVT-based matrix completion method to estimate the noise-free covariance *** this basis,the signal and noise subspaces are obtained from the eigendecomposition of the noise-free cov-ariance ***,traditional subspace-based DOA estimation approaches can be directly ap-plied to determine the *** simulations are performed to demonstrate the effective-ness of the proposed method.

关键词： direction-of-arrival estimation nonuniform noise matrix completion

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Emission Color Tuning with Polymer Molecular Weight for Dyes of 4-Dicyanomethylene-2-methyl-6-{4-[（2-hydroxy- ethyl）（methyl）amino]styryl}-4H-pyran

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Chinese Journal of Chemistry 2011年第9期29卷 1951-1954页

作者： zhang, jinfeng Wu, Jincai Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province State Key Labora- tory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 Chinan

A series of novel polylactide （PLA） polymers were synthesized initiated by 4-dicyanomethylene- 2-methyl-6-{4-[（2-hydroxyethyl）（methyl）amino]styryl}-4H-pyran （DCM） with Sn（Oct）2 as catalyst. The color and emi... 详细信息

关键词： color tuning emission polylactide polymer

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Monolayer MoSi_(2)_N(4-x) as promising electrocatalyst for hydrogen evolution reaction: A DFT prediction

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Journal of Materials Science & Technology 2022年第4期99卷 215-222页

作者： Wangwang Qian Zhe Chen jinfeng zhang Lichang Yin Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Center of Artificial Photosynthesis for Solar Fuels School of ScienceWestlake UniversityHangzhou 310024China Department of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000China

The density functional theory(DFT)calculations have been performed to investigate the catalytic properties of monolayer MoSi_(2)N_(4) for hydrogen evolution reaction(HER).The DFT results show that similar to the majority of other two-dimensional(2D)materials,the pristine MoSi_(2)N_(4) is inert for HER due to its weak affinity toward hydrogen,while monolayer MoSi_(2)N_(4-x)(x=0–0.25)exhibits the highly desirable HER catalytic activities by introducing surface nitrogen vacancy(NV).The predicted HER overpotential(0–60 mV)of monolayer MoSi_(2)N_(4-x) is lower than that(90 mV)of noble metal Pt,when the concentration of surface NV is lower than 5.6%.Electronic structure calculations show that the spin-polarized states appear around the Fermi level after introducing surface NV,thus making the surface NV on 2D MoSi_(2)N_(4) a quite suitable site for ***,the HER activity of MoSi_(2)N_(4-x) is highly dependent on the surface NV concentration,which can be further related to the center of Si-3p *** results demonstrate that the newly discovered 2D MoSi_(2)N_(4) can be served as a promising electrocatalyst for HER via appropriate defect engineering.

关键词： Hydrogen evolution reaction Electrocatalyst 2D material MoSi_(2)N_(4) Surface nitrogen vacancy

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Review on inorganic-organic S-scheme photocatalysts

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Journal of Materials Science & Technology 2023年第34期165卷 187-218页

作者： Jing Wang Zhongliao Wang Kai Dai jinfeng zhang Key Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationAnhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental RemediationHuaibei Normal UniversityHuaibeiAnhui 235000China

The inorganic-organic S-scheme heterojunction photocatalyst demonstrates exceptional light absorption capacity,high photogenerated charge separation efficiency,and remarkable redox ability,while also inheriting diverse advantages of both inorganic and organic *** paper provides a comprehensive review of recent advances in photocatalysis in relation to the inorganic-organic S-scheme heterojunction ***,the fundamental aspects and benefits of the S-scheme heterojunction photocatalyst are outlined,followed by a discussion of several synthetic techniques for producing the inorganic-organic S-scheme heterojunction photocatalyst,as well as various advanced characterization methods that can verify the S-scheme heterojunction photocatalyst in both steady-state and transient *** impact of the inorganic-organic S-scheme heterojunction photocatalyst is illustrated with examples in fields such as carbon dioxide reduction,water splitting for hydrogen production,hydrogen peroxide synthesis,nitrogen fixation,organic pollutant degradation,organic transformation,and ***,suggestions are presented for designing the inorganic-organic S-scheme heterojunction photocatalyst and enhancing its photocatalytic ***,the inorganic-organic Sscheme heterojunction photocatalyst has emerged as a prominent and promising technology in the field of photocatalysis.

关键词： Photocatalysis S-scheme Inorganic-organic hybrid Application

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Numerical modeling investigation on turbulent oscillatory flow over a plane rough bed composed by randomly arrayed particles

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Acta Oceanologica Sinica 2018年第7期37卷 62-68页

作者： ZHOU Zhibo zhang jinfeng zhang Qinghe LIU Run State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China Center for Ocean Hydrodynamics Research Tianjin Research Institute for Water Transport Engineering Ministry of Transport Tianjin 300456 China

A three-dimensional numerical model is established to simulate the turbulent oscillatory boundary layer over a fixed and rough bed composed by randomly arrayed solid spheres based on the lattice Boltzmann method and the large eddy simulation *** equivalent roughness height,the location of the theoretical bed and the time variation of the friction velocity are investigated using the log-fit *** time series of turbulent intensity and Reynolds stress are also *** equivalent roughness height of cases with Reynolds numbers of 1×10^4–6×10^4 is approximately 2.81 d（grain size）.The time variation of the friction velocity in an oscillatory cycle exhibits sinusoidal-like *** friction factor depends on the relative roughness in the rough turbulent regime,and the pattern of solid particles arrayed as the rough bed in the numerical simulations has no obvious effect on the friction factor.

关键词： turbulence oscillatory boundary layer lattice Boltzmann method large eddy simulations equivalent roughness height friction factor

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Optimization on the Impeller of a Low-specific-speed Centrifugal Pump for Hydraulic Performance Improvement

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Chinese Journal of Mechanical Engineering 2016年第5期29卷 992-1002页

作者： PEI Ji WANG Wenjie YUAN Shouqi zhang jinfeng National Research Center of Pumps and Pumping System Engineering and TechnologyJiangsu University

In order to widen the high-efficiency operating range of a low-specific-speed centrifugal pump, an optimization process for considering efficiencies under 1.0Qd and 1.4Qd is proposed. Three parameters, namely, the blade outlet width b2, blade outlet angle β2, and blade wrap angle φ, are selected as design variables. Impellers are generated using the optimal Latin hypercube sampling method. The pump efficiencies are calculated using the software CFX 14.5 at two operating points selected as objectives. Surrogate models are also constructed to analyze the relationship between the objectives and the design variables. Finally, the particle swarm optimization algorithm is applied to calculate the surrogate model to determine the best combination of the impeller parameters. The results show that the performance curve predicted by numerical simulation has a good agreement with the experimental results. Compared with the efficiencies of the original impeller, the hydraulic efficiencies of the optimized impeller are increased by 4.18% and 0.62% under 1.0Qd and 1.4Qd, respectively. The comparison of inner flow between the original pump and optimized one illustrates the improvement of performance. The optimization process can provide a useful reference on performance improvement of other pumps, even on reduction of pressure fluctuations.

关键词： low-specific-speed centrifugal pump optimization optimal Latin hypercube sampling surrogate model particle swarm optimization algorithm numerical simulation

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饲料磷水平对虎龙杂交斑生长、骨矿化及肝脏、血液相关生理生化指标的影响

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中山大学学报（自然科学版）（中英文） 2025年第1期64卷 147-157页

作者：周智愚邓银生张金枫梁程锦吴小易海南大学/海南省热带水生生物技术研究重点实验室海南海口570228 海南大学/南海海洋资源利用国家重点实验室海南海口570228

本文旨在探究饲料不同磷(P)水平对虎龙杂交斑生长、骨矿化及肝脏、血液相关生理生化指标的影响。实验设计了7组以干物质计,其等能(以每100 g计)、等蛋白、等脂分别为1421.2 kJ、47%、8%的实验饲料,饲料中磷的实测值分别为1.05%、1.10%、... 详细信息

本文旨在探究饲料不同磷(P)水平对虎龙杂交斑生长、骨矿化及肝脏、血液相关生理生化指标的影响。实验设计了7组以干物质计,其等能(以每100 g计)、等蛋白、等脂分别为1421.2 kJ、47%、8%的实验饲料,饲料中磷的实测值分别为1.05%、1.10%、1.20%、1.37%、1.52%、1.59%和1.70%,相应缩写为P1.05、P1.10、P1.20、P1.37、P1.52、P1.59及P1.70,每组3个平行。实验鱼[初始体质量(12.14±0.05)g]每日表观饱食投喂两次(8:00和16:30),养殖周期为6周。分析结果显示,P1.05组体质量增长率(WG)、特定生长率(SGR)和肥满度(CF)均极显著高于其他实验组(P0.05)。随着饲料磷水平升高,P1.05组血浆及肝脏碱性磷酸酶(ALP)、甘油三酯(TG)含量高于其他实验组,而全鱼灰分以及血浆、肝脏总胆固醇(TC)含量呈现相反趋势。P1.05组血浆钙(Ca)含量在各实验组中最高,而磷含量最低,脊椎骨Ca、P含量在P1.05组均低于其他实验组。P1.05组肝脏胰岛素样生长因子1(igf-1)基因表达水平显著高于其他实验组(P<0.05)。综上所述,在本实验条件下,w=1.05%饲料磷水平已满足虎龙杂交斑幼鱼生长的需要,过高磷水平则会导致实验鱼生长下降。

关键词：虎龙杂交斑饲料磷水平生长骨矿化

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S-scheme Porous g-C_(3)N_(4)/Ag_(2)MoO_(4)Heterojunction Composite for CO_(2)Photoreduction

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Chinese Journal of Structural Chemistry 2022年第6期41卷 15-22页

作者： Zhongliao Wang Ruilian Liu jinfeng zhang Kai Dai Key Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationAnhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental RemediationSchool of Physics and Electronic InformationHuaibei Normal UniversityHuaibei 235000China

Utilizing solar energy to achieve artificial photosynthesis of chemical fuel is prevalent in tackling excessive CO_(2)emission and fossil fuel *** charge recombination and weak redox capability aggravate the CO_(2)photoreduction *** tailored morphology and constructing matched heterostructure are two significant schemes to ameliorate the CO_(2)photoconversion efficiency of g-C_(3)N_(4)-based ***,a novel S-scheme ultrathin porous g-C_(3)N_(4)(UPCN)/Ag_(2)MoO_(4)(AMO)composite was designed by in-situ growing tetragonalα-AMO nanoparticles(NPs)(5-30 nm)on UPCN nanosheets(NSs).The S-scheme charge transfer route endows UPCN/AMO with fast charge separation and strong redox capability,demonstrated by X-ray photoelectron spectroscopy(XPS),photoelectrochemical tests,steady-state and time-resolved photoluminescence(PL)spectra,and DFT *** UPCN/AMO composite exhibits elevated CO_(2)photoreduction performance with CO and CH_(4)yield rates of 6.98 and 0.38μmol g^(-1)h^(-1),which are 3.5 and 2.9 folds higher than that of pristine UPCN,***,the CO_(2)photoreduction intermediates are analyzed,and the CO_(2)photoreduction mechanism is *** work provides a reference for various g-C_(3)N_(4)-based composites applied in artificial photosynthesis.

关键词： S-scheme g-C_(3)N_(4) Ag_(2)MoO_(4) heterojunction CO_(2)photoreduction

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Template synthesis of silver indium sulfide based nanocrystals performed through cation exchange in organic and aqueous media

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Nano Research 2021年第7期14卷 2321-2329页

作者： Na Gao Rubo zhang Bingkun Chen jinfeng zhang Xiaoling zhang Andrey L.Rogach School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China School of Life Science Beijing Institute of TechnologyBeijing 100081China Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong SARChina

Heavy-metal-free silver based I-III-VI semiconductor nanocrystals(NCs),including ternary silver indium sulfide(AgInS_(2))and derivative quaternary silver indium zinc sulfide(i.e.,AgInZn_(2)S_(4))NCs,possess advantages of low toxicity,and size-tunable band gaps approaching near-infrared spectral range,which make them candidates for use in optoelectronic and biological ***,we report syntheses of AgInS_(2) based NCs starting from In_(2)S_(3) template,which have been performed both in organic and aqueous phase through cation *** a result,ternary silver indium sulfide and quaternary silver indium zinc sulfide NCs are obtained in both organic and aqueous media,and confirmed to be orthorhombic AgInS_(2) NCs and hexagonal AgInZn_(2)S_(4) NCs,***,the aqueous AgInZn_(2)S_(4) NCs with red emission and low cytotoxicity are explored for the cancer cell imaging.

关键词： template synthesis silver indium sulfide based nanocrystals cation exchange organic and aqueous media

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