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Optimizing the micropore-to-mesopore ratio of carbon-fiber-cloth creates record-high specific capacitance

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Journal of Energy Chemistry 2020年第8期29卷 210-216,I0008页

作者： ying zheng Ting Deng Wei Zhang Weitao zheng State Key Laboratory of Automotive Simulation and Control and School of Materials Science&EngineeringElectron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012JilinChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina IKERBASQUE Basque Foundation for ScienceBilbao 48013Spain

The application of commercial carbon fiber cloth(CFC) in energy storage equipment is limited by its low specific capacitance and energy density. By a simple one-step activation treatment, the specific surface area of CFCs with porous structure can be increased considerably from 3.9 up to 875 m^2/g and the electrochemical properties of CFCs can be improved by three orders of magnitude(1324 mF/cm^2). Moreover,the hydrophobicity of CFCs can be transformed into superhydrophilicity. However, the electrochemical performance of CFCs does not show a positive correlation with specific surface area but have a strong relationship with the hierarchical pore distribution forged by the annealing treatment. Only moderate micropore and mesoporous ratio enables optimizing the electrochemical performance of CFCs.

关键词： Pore distribution Hierarchical pores integration Supercapacitors Carbon fiber cloth Electrochemical performance

Recent Developments in Hydrodynamic Cavitation Reactors:Cavitation Mechanism,Reactor Design,and Applications

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Engineering 2022年第12期19卷 180-198页

作者： Haoxuan zheng ying zheng Jesse Zhu Department of Chemical and Biochemical Engineering University of Western OntarioLondonON N6A 3K7Canada

Hydrodynamic cavitation is considered to be a promising technology for process intensification,due to its high energy efficiency,cost-effective operation,ability to induce chemical reactions,and scale-up *** the past decade,advancements have been made in the fundamental understanding of hydrodynamic cavitation and its main variables,which provide a basis for applications of hydrodynamic cavitation in radical-induced chemical reaction ***,we provide an extensive review of these research efforts,including the fundamentals of hydrodynamic cavitation,the design of cavitation reactors,cavitation-induced reaction enhancement,and relevant industrial *** types of hydrodynamic cavitation reactors—namely,stationary and rotational—are *** design parameters of a hydrodynamic cavitation reactor and reactor performance at the laboratory and pilot scales are discussed,and recommendations are made regarding optimal operation and geometric *** commercial cavitation reactors that are currently on the market are reviewed here for the first *** unique features of hydrodynamic cavitation have been widely applied to various chemical reactions,such as oxidization reactions and wastewater treatment,and to physical processes,such as emulsion generation and component *** roles of radicals and gas bubble implosion are also thoroughly discussed.

关键词： Hydrodynamic cavitation Cavitation nuclei Hydroxyl radicals Stationary/rotational hydrodynamic cavitation reactor Reaction enhancement Cavitation application

Sustainable ammonia synthesis:An in-depth review of non-thermal plasma technologies

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Journal of Energy Chemistry 2024年第9期96卷 1-38页

作者： Vahid Shahed Gharahshiran ying zheng Department of Chemical and Biochemical Engineering Thompson Engineering BuildingWestern UniversityLondonON N6A 5B9Canada

Ammonia serves both as a widely used fertilizer and environmentally friendly energy source due to its high energy density,rich hydrogen content,and emissions-free ***,it offers convenient transportation and storage as a hydrogen *** dominant method used for large-scale ammonia production is the Haber-Bosch process,which requires high temperatures and pressures and is ***,non-thermal plasma offers an eco-friendly alternative for ammonia synthesis,gaining significant *** enables ammonia production at lower temperatures and pressures using plasma *** review provides insights into the catalyst and reactor developments,which are pivotal for promoting ammonia efficiency and addressing existing *** first,the reaction kinetics and mechanisms are introduced to gain a comprehensive understanding of the reaction pathways involved in plasma-assisted ammonia ***,the enhancement of ammonia synthesis efficiency is discussed by developing and optimizing plasma reactors and effective *** effect of other feeding sources,such as water and methane,instead of hydrogen is also ***,the challenges and possible solutions are outlined to facilitate energy-saving and enhance ammonia efficiency in the future.

关键词： Nitrogen fixation Ammonia synthesis NH_(3) Non-thermal plasma Ni Ru catalyst

Evaluation of Cr Concentration Effect on Displacement Cascades in Fe-Cr Alloys with Piecewise Potential

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Acta Mechanica Solida Sinica 2020年第2期33卷 239-250页

作者： Xinhua Yang ying zheng Jie Li Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment 1037 Luoyu RoadWuhan 430074China

A piecewise potential was constructed with combination of the concentration-dependent EAM(CD-EAM)potential and Ziegler-Biersack-Littmark(ZBL)potential,and the displacement cascades in random Fe-Cr binary alloys with a wide range of Cr concentration from 0 to 20%were simulated to evaluate the effect of Cr concentration on defect formation and evolution during the *** Cr concentration has little or no effect on the fraction of vacancy clusters,the number of surviving Frenkel pairs,or the self-interstitial and vacancy cluster sizes and a slight effect on the peak time and peak defect number,but a considerable effect on the Cr enrichment in the peak and surviving defects in the cascaded Fe-Cr *** the increase in Cr concentration,the Cr enrichment in the peak and surviving defects exhibits a *** higher enrichment degree in the surviving defects than in the peak defects shows more difficult recombination of Cr SIAs with vacancies.

关键词： Fe-Cr alloy Cr concentration Molecular dynamics Displacement cascades

Remarkably reducing carbon loss and H2 consumption on Ni–Ga intermetallic compounds in deoxygenation of methyl esters to hydrocarbons

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Journal of Energy Chemistry 2020年第2期29卷 194-208页

作者： Ning Zhao ying zheng Jixiang Chen Tianjin Key Laboratory of Applied Catalysis Science and Technology Department of Catalysis Science and EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China

Ni–Ga alloy(Ni/Ga atomic ratio of 8),Ni3Ga and Ni5Ga3 intermetallic compounds(IMCs)catalysts were prepared from Ni–Mg-Al-Ga layered double hydroxides(LDHs)for the deoxygenation of methyl esters to *** the alloy and IMCs,the presence of Ga reduced the surface Ni atom density,and the charge transfer from Ga to Ni increased the electron density of *** the deoxygenation of methyl laurate,the Ni catalyst gave a complete hydrogenolysis of methyl laurate to CH4at 330°C and 3.0 MPa,while the presence of Ga promoted the HDO pathway and suppressed C–C bond hydrogenolysis and *** Ni5Ga3 catalyst exhibited the best desired *** at 400°C,it gave the yield of C11 and C12 hydrocarbons of ~99%,and the selectivity to CH4(SCH4) was only 2.4%.In the deoxygenation of methyl octanoate and methyl palmitate,the Ni5Ga3 catalyst also gave the yield of hydrocarbons above95%.Reactivity evaluation and methyl propionate-TPD and TPSR results indicate that the C–OCH3 bond instead of the O–CH3 one was cleaved on both Ni and bimetallic Ni–Ga *** is highlighted that methanol,derived from the C–OCH3 bond hydrogenolysis,mainly decomposed to CO and H2 on IMCs,while it was converted to methane on metallic Ni and *** is of great significance that H2 could be yielded from the methyl ester *** short,the utilization of Ni–Ga IMCs can effectively reduce carbon loss and H2 consumption,all of which are ascribed to the geometric and electronic effects of Ga.

关键词： Ni–Ga intermetallic compounds Methyl ester Decarbonylation/decarboxylation Hydrodeoxygenation C–C bond hydrogenolysis Methanation

An M-Objective Penalty Function Algorithm Under Big Penalty Parameters

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Journal of Systems Science & Complexity 2016年第2期29卷 455-471页

作者： zheng ying MENG Zhiqing SHEN Rui Basic College Ningbo Dahongying University College of Economics and Management Zhejiang University of Technology

Some classical penalty function algorithms may not always be convergent under big penalty parameters in Matlab software,which makes them impossible to find out an optimal solution to constrained optimization *** this paper,a novel penalty function(called M-objective penalty function) with one penalty parameter added to both objective and constrained functions of inequality constrained optimization problems is *** on the M-objective penalty function,an algorithm is developed to solve an optimal solution to the inequality constrained optimization problems,with its convergence proved under some ***,numerical results show that the proposed algorithm has a much better convergence than the classical penalty function algorithms under big penalty parameters,and is efficient in choosing a penalty parameter in a large range in Matlab software.

关键词： Algorithm constrained optimization problem M-objective penalty function stability.

Annotating the Literature with Disease Ontology

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Chinese Journal of Electronics 2017年第6期26卷 1261-1268页

作者： YANG Li ZHOU Yanhong zheng ying School of Computer and Communication Engineering Changsha University of Science and Technology School of Computer Science and Technology Huazhong University of Science and Technology

With the rapid growth of inquiry in biomedicine concerning diseases, the recognition of diseases becomes especially important. But only the recognition of the biomedical concepts in literature is not enough,annotations and normalizations of the concepts with normalized Metathesaurus get even more important. This paper proposes a system to annotate the literature with normalized Metathesaurus. First, a two-phase Conditional random fields(CRFs) is used to recognize the disease mentions, including the location and identification. Then, the paper adapts the Disease ontology(DO) to annotate the diseases recognized for normalization by computing the similarity between disease mentions and concepts. According to the similarities, the disease mentions are denoted as disease concepts and instances distinctively. The experiments carried out on the Arizona disease corpus show that our system makes a good achievement and outperforms the other works.

关键词： Text mining Disease ontology Annotation CRFs Dictionary Similarity

[Y(IO3)3(H2O)2]n: a New Rare Earth Iodate Featuring the Circle-shaped I4O12 Polyiodate Anion and Three-order Nonlinear Optical Property

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Chinese Journal of Structural Chemistry 2020年第7期39卷 1307-1313页

作者： CHEN Jing-Jing zheng Yu-ying College of Material Science and Engineering Fuzhou UniversityFuzhou 350108China

A new layered yttrium iodate[Y(IO3)3(H2O)2]n(1)has been prepared from the hydrothermal reaction of Y(NO3)3?6H2O with I2O5 at 170℃,and its structure was determined by X-ray single-crystal diffraction *** belongs to the triclinic system,space group P1 with a=7.355(5),b=7.515(5),c=9.413(7)?,α=79.65(2)o,β=85.18(3)o,γ=71.870(19)o,Z=2,V=486.2(6)?3.1 was further characterized by FTIR,powder X-ray diffraction(PXRD)and UV-Vis *** 1,the Y centers in a monocapped trigonal prism environment are bound by IO-3 anion and unique circle-shaped I4O12 polyiodate anion to generate a wave-like 2-D *** adjacent layers are further linked with each other by hydrogen bonds to form a quasi-3-D supramolecular network.1 exhibits a reverse saturation absorption and a self-defocusing effect with the nonlinear absorption coefficientβbeing–0.66×10-5 mW-1,which stems mainly from the electron transition from O-2p to I-5p orbital within iodates upon theoretical calculation.

关键词： rare earth iodate hydrothermal synthesis three-order nonlinear optical theoretical calculation

Quasi-3-D Gadolinium Iodate Constructed from Infinite Polyiodate: Structure, Green-emission and UV Light-driven Degradation on Organic Dye

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Chinese Journal of Structural Chemistry 2020年第7期39卷 1323-1330页

作者： CHEN Jing-Jing zheng Yu-ying College of Material Science and Engineering Fuzhou UniversityFuzhou 350108China

A new gadolinium iodate has been synthesized via hydrothermal method,and its structure was determined as[Gd(H2O)(IO3)2(IO3H2O)]n(1)by X-ray single-crystal *** 2-D layer is built from the linkage of Gd2O16I4 dimer viaμ2/μ3-bridged iodates,and the quasi-3-D network is generated via weak I···O bonds and hydrogen ***,powder X-ray diffraction(PXRD)and UV-Vis spectra were conducted to characterize the as-synthesized ***,1 exhibits green emission,which might be assigned to electronic transfer within iodate *** UV adsorption of 1 hints its UV light-driven photocatalytic property,and as expected,it exhibits photocatalytic activity for the degradation of rhodamine *** calculation was conducted to give structure/property correlation.

关键词： rare earth iodate hydrothermal synthesis luminescence DFT calculation