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Science Bulletin 2024年第2期69卷 209-217页

作者： Chuyang Jing Kuan Dai Dong Liu Wenran Wang Libao Chen Chunxiao Zhang weifeng wei State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Materials and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104China

High-voltage lithium metal batteries(LMBs)have been considered promising next-generation highenergy-density ***,commercial carbonate electrolytes can scarcely be employed in LMBs owing to their poor compatibility with metallic lithium.N,N-dimethylacrylamide(DMAA)-a crosslinkable solubilizer with a high Gutmann donor number-is employed to facilitate the dissolution of insoluble lithium nitrate(LiNO3)in carbonate-based electrolytes and to form gel polymer electrolytes(GPEs)through in situ *** Lit solvation structure of the GPEs is regulated using LiNO3 and DMAA,which suppresses the decomposition of LiPFe and facilitates the formation of an inorganic-rich solid electrolyte ***,the Coulombic efficiency(CE)of the LillCu cell assembled with a GPE increases to 98.5%at room temperature,and the high-voltage LillNCM622 cell achieves a capacity retention of 80.1%with a high CE of 99.5%after 400 *** bifunctional polymer electrolytes are anticipated to pave the way for next-generation high-voltage LMBs.

关键词： Crosslinked solubilizer Lithium nitrate Carbonate electrolytes Gel polymer electrolytes Lithium metal batteries

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田间机收元胡离散元模型参数标定与试验

中国农机化学报 2024年第4期45卷 32-38页

作者：刘珂魏伟锋朱纪跃李高伟高震南陕西理工大学机械工程学院陕西汉中723000 陕西省工业自动化重点实验室陕西汉中723000

为提高机收元胡所用离散元仿真模型参数准确性,通过物理试验与仿真试验结合的方法对元胡离散元参数进行标定。首先,采用物理试验确定元胡基本物性参数范围;其次,依据物理试验测定的参数范围进行休止角的显著性试验,得到对元胡休止角影... 详细信息

为提高机收元胡所用离散元仿真模型参数准确性,通过物理试验与仿真试验结合的方法对元胡离散元参数进行标定。首先,采用物理试验确定元胡基本物性参数范围;其次,依据物理试验测定的参数范围进行休止角的显著性试验,得到对元胡休止角影响由大到小的顺序为元胡间滚动摩擦系数、元胡与钢板间滚动摩擦系数、元胡间碰撞恢复系数;再通过最陡爬坡试验缩小显著性参数取值范围,并通过响应面试验建立休止角与显著因素的最优二阶回归方程;以物理试验休止角为目标获取最佳参数组合:元胡间滚动摩擦系数0.08、元胡与钢板间滚动摩擦系数0.32、元胡间碰撞恢复系数0.49。最后,在对比标定模型参数下仿真堆积体与实际堆积体,测得二者的休止角和堆体外形轮廓无明显差异,表明该最佳参数组合可作为元胡机收过程中离散元仿真模型参数。

关键词：元胡离散元模型参数标定休止角收获机械

In Situ Formed Tribofilms as Efficient Organic/Inorganic Hybrid Interlayers for Stabilizing Lithium Metal Anodes

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Nano-Micro Letters 2023年第12期15卷 320-333页

作者： Shaozhen Huang Kecheng Long Yuejiao Chen Tuoya Naren Piao Qing Xiaobo Ji weifeng wei Zhibin Wu Libao Chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083People’s Republic of China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083People’s Republic of China

The practical application of Li metal anodes(LMAs)is limited by uncontrolled dendrite growth and side ***,we propose a new friction-induced strategy to produce high-performance thin Li anode(Li@CFO).By virtue of the in situ friction reaction between fluoropolymer grease and Li strips during rolling,a robust organic/inorganic hybrid interlayer(lithiophilic LiF/LiC_(6)framework hybridized-CF_(2)-O-CF_(2)-chains)was formed atop Li *** derived interface contributes to reversible Li plating/stripping behaviors by mitigating side reactions and decreasing the solvation degree at the *** Li@CFO||Li@CFO symmetrical cell exhibits a remarkable lifespan for 5,600 h(1.0 mA cm^(-2)and 1.0 mAh cm^(-2))and 1,350 cycles even at a harsh condition(18.0 mA cm^(-2)and 3.0 mAh cm^(-2)).When paired with high-loading LiFePO4 cathodes,the full cell lasts over 450 cycles at 1C with a high-capacity retention of 99.9%.This work provides a new friction-induced strategy for producing high-performance thin LMAs.

关键词： Lithium metal anode Organic/inorganic hybrid interlayers High current density Fluoropolymer grease Local desolvation environment

Fast ion diffusion alloy layer facilitating 3D mesh substrate for dendrite-free zinc-ion hybrid capacitors

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Journal of Energy Chemistry 2022年第10期31卷 565-574,I0014页

作者： Huaming Yu Quanyu Li Wen Liu Han Wang Xuyan Ni Qiwen Zhao weifeng wei Xiaobo Ji Yuejiao Chen Libao Chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina

Although aqueous zinc ion hybrid capacitors have advantageous integration of batteries and supercapacitors,they still suffer from the inherent problems of dendrite growth and interfacial side reactions on Zn ***,a universal fast zinc-ion diffusion layer on a three-dimensional(3 D)mesh structure model is demonstrated to effectively improve Zn plating/stripping *** fast ion diffusion alloy layer accelerates the Zn^(2+)migration in an orderly manner to homogenize Zn^(2+)flux and overcomes the defects of the commercial mesh substrate,effectively avoiding dendrite growth and side ***,the proof-of-concept silver-zinc alloy modified stainless steel mesh delivers superb reversibility with the high coulombic efficiency over 99.4%at 4 mA cm^(-2)after 1600 cycles and excellent reliability of over 830 h at 1 mA cm^(-2),Its feasibility is also evidenced in commercial zinc ion hybrid capacitors with activated carbon as the *** work enriches the fundamental comprehension of fast zinc-ion diffusion layer combined with a 3 D substrate on the Zn deposition and opens a universal approach to design advanced host for Zn electrodes in zinc ion hybrid capacitors.

关键词： Zinc-ion hybrid capacitors 3D metal mesh Flexible electrode Fast ion diffusion Alloy layer Zinc ion kinetics

Saturation Estimation with Complex Electrical Conductivity for Hydrate-Bearing Clayey Sediments:An Experimental Study

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Journal of Ocean University of China 2024年第1期23卷 173-189页

作者： XING Lanchang ZHANG Shuli ZHANG Huanhuan WU Chenyutong WANG Bin LAO Liyun wei wei HAN weifeng wei Zhoutuo GE Xinmin DENG Shaogui College of Control Science and Engineering China University of Petroleum(East China)Qingdao 266580China School of Water Energy and EnvironmentCranfield UniversityCranfield MK430ALUnited Kingdom Department of Alternative Energy PetroChina Research Institute of Petroleum Exploration&DevelopmentLangfang 065007China School of Geosciences China University of Petroleum(East China)Qingdao 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

Clays have considerable influence on the electrical properties of hydrate-bearing *** is desirable to understand the electrical properties of hydrate-bearing clayey sediments and to build hydrate saturation(S_(h))models for reservoir evaluation and *** electrical properties of tetrahydrofuran-hydrate-bearing sediments with montmorillonite are characterized by complex conductivity at frequencies from 0.01 Hz to 1 *** effects of clay and Sh on the complex conductivity were analyzed.A decrease and increase in electrical conductance result from the clay-swelling-induced blockage and ion migration in the electrical double layer(EDL),*** quadrature conductivity increases with the clay content up to 10%because of the increased surface site density of counterions in *** the in-phase conductivity and quadrature conductivity decrease consistently with increasing Sh from 0.50 to *** sets of models for Sh evaluation were *** model based on the Simandoux equation outperforms Archie’s formula,with a root-mean-square error(E_(RMS))of 1.8%and 3.9%,respectively,highlighting the clay effects on the in-phase *** fre-quency effect correlations based on in-phase and quadrature conductivities exhibit inferior performance(E_(RMS)=11.6%and 13.2%,re-spectively)due to the challenge of choosing an appropriate pair of frequencies and intrinsic uncertainties from two *** second-order Cole-Cole formula can be used to fit the complex-conductivity *** pair of inverted Cole-Cole parameters,i.e.,characteristic time and chargeability,is employed to predict S_(h) with an E_(RMS) of 5.05%and 9.05%,respectively.

关键词： gas hydrate complex electrical conductivity hydrate-bearing clayey sediment hydrate saturation Simandoux equation frequency dispersion Cole-Cole formula

Heteroatom Structural Engineering Enables Ethenylene-Bridged Bisisoindigo-Based Copolymers to Exhibit Unique n-Type Transistor Performance

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CCS Chemistry 2024年第2期6卷 473-486页

作者： Yuchai Pan weifeng Zhang Yankai Zhou Xuyang wei Hao Luo Jinbei wei Liping Wang Gui Yu Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190 School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049 School of Material Science and Engineering University of Science and Technology BeijingBeijing 100083

Herein,we report three novel electron-deficient aromatics,ethenylene-bridged bisisoindigos 3,3′-((3E,3′E)-((E)-ethene-1,2-diyl)bis(1-(4-decyltetradecyl)-2-oxoind-oline-6-yl-3-ylidene))bis(1-(4-decyltetradecyl)-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one)(NCCN),3,3′-((3E,3′E)-((E)-ethene-1,2-diyl)bis(1-(4-decyltetradecyl)-7-fluoro-2-oxoindoline-6-yl-3-ylidene))bis(1-(4-decyltetradecyl)-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one)(NFFN),and(3E,3″E)-6,6″-((E)-ethene-1,2-diyl)bis(1,1′-bis(4-decyltetradecyl)-[3,3′-bipyrrolo[2,3-b]pyridinylidene]-2,2′(1H,1′H)-dione)(NNNN),and their derived donor–acceptor(D–A)copolymers,namely poly[3,3′-((3E,3′E)-((E)-ethene-1,2-diyl)bis(1-(4-decyltetradecyl)-2-oxoindoline-6-yl-3-ylidene))bis(1-(4-decyltetradecyl)-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one-6-yl)]-alt-[5,6-difluoro-4,7-di[(thiophen-2-yl)-5-yl)]benzo[c][1,2,5]thiadiazole](PNCCN-FBT),poly[3,3′-((3E,3′E)-((E)-ethene-1,2-diyl)bis(1-(4-decyltetradecyl)-7-fluoro-2-oxoindoline-6-yl-3-ylidene))bis(1-(4-decyltetradecyl)-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one-6-yl)]-alt-[5,6-difluoro-4,7-di[(thiophen-2-yl)-5-yl)]benzo[c][1,2,5]thiadiazole](PNFFNFBT),and poly[(3E,3″E)-6′,6‴-((E)-ethene-1,2-diyl)bis(1,1′-bis(4-decyltetradecyl)-[3,3′-bipyrrolo[2,3-b]pyridinylidene]-2,2′(1H,1′H)-dione-6-yl)]-alt-[5,6-difluoro-4,7-di[(thiophen-2-yl)-5-yl)]benzo[c][1,2,5]thiadiazole](PNNNN-FBT),in which 5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole(FBT)acts as the electron-donating *** ethenylene-bridging unit reduces the steric hindrance of the three *** of heteroatoms,such as fluorine and sp2-nitrogen atoms,endows them with multiple CH···F,CH···N,and N···S intramolecular hydrogen bonds/nonbinding interactions,resulting in increasing backbone planarity from NCCN,NFFN,to NNNN,and thus from PNCCN-FBT,PNFFN-FBT,to *** found that all copolymers formed an improved molecular packing in the 1-chloronaphthalene(CN)-processed thin film compared with the 1,2-d

关键词： D-A copolymers bisisoindigos heteroatom structural engineering n-type field-effect transistors electron mobilities

Zeolite-confined Fe-site Catalysts for the Hydrogenation of CO_(2) to Produce High-value Chemicals

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Chemical Research in Chinese Universities 2024年第1期40卷 78-95页

作者： HAN Xiaoyang XIA Huicong TU weifeng wei Yifan XUE Dongping LI Minhan YAN Wenfu ZHANG Jia-Nan HAN Yi-Fan College of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001P.R.China State Key Laboratory of Coking Coal Resources Green Exploitation Zhengzhou UniversityZhengzhou450001P.R.China Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou450001P.R.China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry and College of Chemistry Jilin UniversityChangchun130012P.R.China State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai200237P.R.China

Zeolite-confined Fe-site catalysts(ZFCs)have emerged as superior materials for sustainably producing high-value chemicals through CO_(2) hydrogenation,owing to their adaptable framework,customizable composition,and thermal *** excel in activating,adsorbing,and converting CO_(2) with remarkable efficiency and consistency in *** has sparked a surge in research interest in recent *** review delves into the latest advancements in CO_(2) catalytic hydrogenation to olefins,alcohols,aromatics,and other liquid hydrocarbons,examining the synthesis,modification tactics,and the correlation between structure and performance across various ***,it underscores the pivotal factors affecting performance and sheds light on the mechanisms behind selectivity control in the CO_(2) hydrogenation process facilitated by *** conclude,it presents pressing challenges and strategic recommendations to inspire the development of high-performance,durable ZFCs for CO_(2) hydrogenation applications.

关键词： Zeolite-confined Fe-site catalyst CO_(2) hydrogenation Modification strategy High-value chemical

Improvement of Ductility of Powder Metallurgy Titanium Alloys by Addition of Rare Earth Element

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Journal of Materials Science & Technology 2006年第4期22卷 465-469页

作者： Yong LIU Lifang CHEN weifeng wei Huiping TANG Bin LIU Baiyun HUANG State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Northwest Institute of Nonferrous Metals Research Xi＇an 710016 China

Ti-4.5Al-6.0Mo-1.5Fe, Ti-6Al-1Mo-1Fe and Ti-6Al-4V alloys were prepared by blended elemental powder metallurgy （PM） process, and the effects of Nd on the microstructures and mechanical properties were investigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and X-ray diffraction （XRD）. It was found out that the addition of Nd increased the density of sintered titanium alloys slightly by a maximum increment of 1% because small amount of liquid phase occurred during sintering. The addition of Nd shows little effect on the improvement of tensile strength, while the elongation is significantly improved. For example, the elongation of ***-6.0Mo-1.5Fe can be increased from 1% without addition of Nd to 13% at a Nd content of 1.2 wt pct.

关键词： Powder metallurgy titanium alloy Mechanical properties Microstructure Rare earth element

Hierarchically porous Ni monolith@branch-structured NiCo2O4 for high energy density supercapacitors

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Progress in Natural Science:Materials International 2016年第3期26卷 276-282页

作者： Mengjie Xu Rongjun Xu Ying Zhao Libao Chen Boyun Huang weifeng wei State Key Laboratory of Powder Metallurgy Central South University

A variety of NiCo2O4nanostrucutures ranging from nanowire to nanoplate and branched structures were successfully prepared via a simple hydrothermal process. The experimental results show that NiCo2O4with branched structures possesses the best overall electrochemical performance. The improvement of energy density was explored in terms of hierarchically three-dimensional（3D） metal substrates and a high specific area capacitance, and area energy density is obtained with hierarchically porous Ni monolith synthesized through a controlled combustion procedure.

关键词： Supercapacitors NiCo2O4 nanostructures Porous Ni monolith Energy density

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艾灸治疗排卵障碍性疾病的作用机制研究概述

环球中医药 2024年第3期17卷 551-557页

作者：付雅琪魏伟峰胡小芳河南中医药大学第一临床医学院郑州450000 河南中医药大学第一附属医院普罗门诊

排卵障碍包括稀发排卵及无排卵,是生殖医学科的常见病种。中医认为本病根本责之肾虚,治疗以补肾为主。笔者查阅相关资料,发现艾灸对本病的治疗有其独特疗效,其起效机制包含以下五个方面:(1)调节生殖激素、甲状腺激素、肾上腺皮质激素水... 详细信息

排卵障碍包括稀发排卵及无排卵,是生殖医学科的常见病种。中医认为本病根本责之肾虚,治疗以补肾为主。笔者查阅相关资料,发现艾灸对本病的治疗有其独特疗效,其起效机制包含以下五个方面:(1)调节生殖激素、甲状腺激素、肾上腺皮质激素水平,改善内分泌紊乱;(2)调控氧化应激及颗粒细胞凋亡,改善因卵巢功能衰退导致的排卵障碍;(3)调节卵泡液中细胞因子的表达,促进颗粒细胞的分裂及卵母细胞的发育成熟;(4)改善卵巢血液微循环,缓解卵泡缺氧;(5)改善卵巢组织形态,恢复卵巢排卵功能。本文从艾灸治疗排卵障碍性疾病的实验研究与临床研究两方面出发,总结近年来艾灸治疗本病的作用机制的一手文献,并分析目前研究优势及不足点,以期为未来临床应用提供理论基础和应用思路。

关键词：艾灸排卵障碍下丘脑-垂体-卵巢轴甲状腺激素氧化应激颗粒细胞凋亡炎症因子卵巢动脉血流

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