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D_(K) SPACES AND CARLESON MEASURES

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Acta Mathematica Scientia 2022年第3期42卷 1103-1112页

作者： Dongxing li Hasi WULAN Ruhan zhao School of Financial Mathematics and Statistics Guangdong University of FinanceGuangzhou 510521China Department of Mathematics Shantou UniversityShantou 515063China Department of Mathematics SUNY BrockportBrockportNY 14420USA

We give some characterizations of Carleson measures for Dirichlet type spaces by using Hadamard *** also give a one-box condition for such Carleson measures.

关键词： DK space Hadamard product mean growth Carleson measure

Ruddlesden–Popper Perovskite for Stable Solar Cells

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Energy & Environmental Materials 2018年第4期1卷 221-231页

作者： Chao liang Dandan zhao Yan li Xiaojun li Shaomin Peng Guosheng Shao Guichuan Xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao 999078 China State Centre for International Cooperation on Designer Low-Carbon and Environmental Material(SCICDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Three-dimensional metal-halide perovskites have emerged as promising light harvesting materials for converting sunlight to electricity in the last few *** power conversion efficiency of 23.3%has been ***,the main challenge that currently limits the application of the perovskite solar cells is the long-term stability,which has ambient,thermal,and photo stability weaknesses.

关键词： low dimension perovskite solar cells Ruddlesden-Popper stability

Optimization of contact-mode triboelectric nanogeneration for high energy conversion efficiency

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Science China(Information Sciences) 2018年第6期61卷 78-86页

作者： Huamin CHEN Yun XU lin BAI Jian li Tong li Chen zhao Jiushuang ZHANG Guofeng SONG Institution of Semiconductors Chinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences

The rapid growth of flexible and wearable electronics makes it an urgent requirement to develop mobile and sustainable energy sources for these devices. Triboelectric nanogenerator(TENG) stands out for its outstanding performance. However, high output performance and energy conversion efficiency TENG still remains one of the most crucial barriers for practical applications. In this paper, we systematically analyze the relationship of maximum instantaneous output power and energy conversion efficiency with the material parameters, structural parameters and experimental parameters. Firstly, we obtain the explicit equations for the transferred charge, output voltage, output current and maximum instantaneous power from the contactmode model and governing equation. Then it is deeply studied how the material parameters, structure parameters and experimental condition can influence the output performance. Finally, the relationship of energy conversion efficiency with the TENG parameters is investigated to provide guidance for rational design of TENG. The high efficiency energy source could greatly promote the development of flexible electronics.

关键词： flexible electronics triboelectric nanogenerator output performance energy efficiency

Covalently integrated core-shell MOF@COF hybrids as efficient visible-light-driven photocatalysts for selective oxidation of alcohols

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Journal of Energy Chemistry 2020年第4期29卷 8-15页

作者： Guilong Lu Xiubing Huang Yang li Guixia zhao Guangsheng Pang Ge Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule&Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Laboratory of Industrial Chemistry Faculty of Chemistry and BiochemistryRuhr-Universitat BochumBochum 44780Germany State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012JilinChina

Building a covalently connected structure with accelerated photo-induced electrons and charge-carrier separation between semiconductors could enhance the photocatalytic *** this work,we report a facile and novel seed growth method to coat NH2-MIL-125 MOFs with crystalline and porous covalent organic frameworks(COFs)materials and form a range of NH2-MIL-125@TAPB-PDA nanocomposites with different thicknesses of COF *** introduction of appropriate content of COF could not only modify the intrinsic electronic and optical properties,but also enhance the photocatalytic activity ***,NH2-MIL-125@TAPB-PDA-3 with COF shell thickness of around 20nm exhibited the highest yield(94.7%)of benzaldehyde which is approximately 2.5 and 15.5 times as that of parental NH2-MIL-125 and COF,*** promoted photocatalytic performance of hybrid materials was mainly owing to the enhanced photo-induced charge carriers transfer between the MOF and COF through the covalent *** addition,a possible mechanism to elucidate the process of photocatalysis was ***,this kind of MOF-based photocatalysts possesses great potentials in future green organic synthesis.

关键词： Metal organic frameworks Covalent organic frameworks Core-shell structure Photocatalyst Selective alcohol oxidation

Investigation and Modeling of Austenite Grain Evolution for a Typical High-strength Low-alloy Steel during Soaking and Deformation Process

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 996-1010页

作者： Ming-Jie zhao liang Huang Chang-Min li Jia-Hui Xu Xu-Yang li Jian-Jun li Peng-Chuan li Chao-Yuan Sun State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China China National Erzhong Group Deyang Wanhang Die Forging Co.LTD Deyang 618000China

The final mechanical properties of components greatly depend on their grain size. It is necessary to study the grain evolution during different thermomechanical processes. In the study, the real-time austenite grain evolution of a high-strength low-alloy(HSLA) steel during the soaking process is investigated by in situ experiments. The effects of different deformation parameters on the dynamic recrystallization(DRX) kinetic behaviors are investigated by hot compression experiments. Based on the observations and statistics of the microstructures at different thermomechanical processes, a unified grain size model is established to evaluate the effects of soaking parameters and deformation parameters on the austenite grain evolution. Also, the DRX kinetic model and critical strain model are established, which can describe the effects of the soaking process on the DRX kinetics process well. The established grain size model and DRX kinetic model are compiled into the numerical simulation software using Fortran language. The austenite grain evolution of the material under different deformation conditions is simulated, which is consistent with the experimental results. It indicates that the established model is reliable, and can be used to simulate and predict the grain size during different thermomechanical processes accurately.

关键词： High-strength steel Grain growth Dynamic recrystallization Grain size model Numerical simulation

Computational study of transition metal single-atom catalysts supported on nitrogenated carbon nanotubes for electrocatalytic nitrogen reduction

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Nano Research 2023年第1期16卷 325-333页

作者： Yanyang Qin Yan li Wenshan zhao Shenghua Chen Tiantian Wu Yaqiong Su School of Chemistry Xi'an Key Laboratory of Sustainable Energy Materials ChemistryState Key Laboratory of Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'an 710049China Department of Chemistry Tsinghua UniversityBeijing 100084China

Developing efficient and stable catalysts for the electrocatalytic N_(2)reduction reaction(NRR)shows promise in nitrogen ***,we proposed active and stable single-atom catalysts(SACs)toward NRR,where transition metals are anchored on nitrogenated carbon nanotubes(NCNTs).Among the screened nine common transition metals(Ti,V,Cr,Mn,Fe,Mo,Ru,Rh,and Ag)on(4,4)NCNTs,we found Mo-NCNT possesses the most excellent NRR catalytic activity and selectivity with a low overpotential of 0.29 ***,the NRR performance of Mo-NCNT was further engineered by controlling the nanotube diameter,where the lowest overpotential is 0.18 V at a diameter of 9.6Å.In addition,we found a linear scaling relation between*NNH and*NH_(2)on the studied catalysts with the exception of(2,2)and(3,3)Mo-NCNTs,owing to their extremely unstable *** attribute the outstanding NRR performance of Mo-NCNT to the moderate adsorption of N_(2)due to the slightly low d-band center of Mo,and the charge donating and accepting capacity of *** work has provided a deeper insight into designing highefficiency and stable NRR SACs supported by NCNTs.

关键词： nitrogen reduction single-atom catalysts density functional theory(DFT) carbon nanotubes nitrogen doping

Technical factors affecting the performance of anion exchange membrane water electrolyzer

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International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2259-2269页

作者： Xun Zhang Yakang li Wei zhao Jiaxin Guo Pengfei Yin Tao ling Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Institute of New-EnergySchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China School of Materials Science and Engineering Tianjin Chengjian UniversityTianjin 300384China

Anion exchange membrane(AEM)electrolysis is a promising membrane-based green hydrogen production ***,AEM electrolysis still remains in its infancy,and the performance of AEM electrolyzers is far behind that of well-developed alkaline and proton exchange membrane ***,breaking through the technical barriers of AEM electrolyzers is *** the basis of the analysis of the electrochemical performance tested in a single cell,electrochemical impedance spectroscopy,and the number of active sites,we evaluated the main technical factors that affect AEM *** factors included catalyst layer manufacturing(e.g.,catalyst,carbon black,and anionic ionomer)loadings,membrane electrode assembly,and testing conditions(e.g.,the KOH concentration in the electrolyte,electrolyte feeding mode,and operating temperature).The underlying mechanisms of the effects of these factors on AEM electrolyzer performance were also *** irreversible voltage loss in the AEM electrolyzer was concluded to be mainly associated with the kinetics of the electrode reaction and the transport of electrons,ions,and gas-phase products involved in *** on the study results,the performance and stability of AEM electrolyzers were significantly improved.

关键词： hydrogen production anion exchange membrane water electrolyzer catalyst membrane electrode assembly

Functionalization of PEG-PM PC-based polymers for potential theranostic applications

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Frontiers of Materials Science 2021年第2期15卷 280-290页

作者： Ning CHEN Sidi li Xueping li lixia LONG Xubo YUAN Xin HOU Jin zhao Tianjin Key Laboratory of Composite and Functional Materials Tianjin 300350China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China

The synergistic effect of polyethylene glycol(PEG)and poly(2-methacry-loyloxyethyl phosphorytcholine)(PMPC)can effectively reduce the protein absorption,which is beneficial to ***,PEG-PMPC-based polymers have rarely been used as nanocarriers in the theranostic field due to their limited modifiability and weak interaction with other ***,a plain method was proposed to endow them with the probable ability of loading small active agents,and the relationship between the structure and the ability of loading hydrophobic agents was explored,thus expanding their ***,mPEG-PMPC or 4-arm-PEG-PMPC polymer was synthesized by atom transfer radical polymerization(ATRP)using mPEG-Br or 4-arm-PEG-Br as the *** a strong hydrophobic segment,poly(butyl methacrylate)(PBMA),was introduced and the ability to load small hydrophobic agents was further *** results showed that linear mPEG-PMPC-PBMA could form micelles 50-80 nm in size and load the hydrophobic agent such as Nile red *** contrast,star-like 4-arm-PEG-PMPC-PBiyiA,a monomolecular micelle(10-20 nm),could hardly load any hydrophobic *** work highlights effective strategies for engineering PEG-PMPC-based polymers and may facilitate the further application in numerous fields.

关键词： polyethylene glycol poly(2-methacryloyloxyethyl phosphorylcholine) atom transfer radical polymerization self-assembly monomolecular micelles

The mystic role of high-entropy designs in rechargeable metal-ion batteries:A review

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Journal of Energy Chemistry 2024年第11期98卷 441-471页

作者： Yicheng lin Shaohua Luo Wei zhao Qi Sun Jun Cong Pengwei li Pengyu li Shengxue Yan School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004HebeiChina Department of Chemistry and Bioscience Aalborg University9220 AalborgDenmark

Rechargeable metal-ion batteries, such as lithium-ion batteries(liBs) and sodium-ion batteries(SIBs),have raised more attention because of the large demand for energy storage solutions. Undoubtedly, electrode materials and electrolytes are key parts of batteries, exhibiting critical influence on the reversible capacity and span life of the metal-ion battery. Nonetheless, researchers commonly express concerns regarding the stability of both electrodes and electrolytes. Given its commendable stability attributes,high-entropy materials have garnered widespread acclaim and have been applied in many fields since their inception, notably in energy storage. However, while certain high-entropy designs have achieved substantial breakthroughs, some have failed to meet anticipated outcomes within the high energy density energy storage materials. Moreover, there is a lack of comprehensive summary research on the corresponding mechanisms and design principles of high-entropy designs. This review examines the current high-entropy designs for cathodes, anodes, and electrolytes, aiming to summarize the design principle,potential mechanisms, and electrochemical performance. We focus on their structural characteristics,interface characteristics, and prospective development trends. At last, we provide a fair evaluation along-side succinct development suggestions.

关键词： High-entropy materials Energy storage materials Electrodes Electrolytes Interface