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Immobilization of NiS nanoparticles on N-doped carbon fiber aerogels as advanced electrode materials for supercapacitors

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Nano Research 2016年第9期9卷 2747-2759页

作者： Youfang zhang Lizeng Zuo longsheng zhang Jiajie Yan Hengyi Lu Wei Fan Tianxi Liu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University220 Handan RoadShanghai 200433China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University2999 North Renmin RoadShanghai 201620China

NiS nanoparticles (NPs) with excellent electrochemical capacitance have attracted considerable attention as cost-effective energy-storage materials for supercapacitors in recent years. Preventing the aggregation and increasing the conductivity of NiS NPs are key to fully realizing their excellent electrochemical properties. In this work, NiS/N-doped carbon fiber aerogel (N-CFA) nanocomposites were obtained easily through the combination of polymerization, carbonization, and a one-step solvothermal reaction. N-CFA derived from polydopamine (PDA)-coated cotton wool was used as a template for the construction of hierarchical NiS/N-CFA nanocomposites, in which NiS NPs are uniformly immobilized on the surface of N-CFA. In this nanostructured system, N-CFA containing abundant nanofibers not only provides active regions for the growth of NiS NPs to prevent their aggregation, but also offers short pathways for the transport of electrons and ions. The electrochemical properties of the obtained NiS/N-CFA nanocomposites were investigated by cyclic voltammetry, galvanostatic charge–discharge, and alternating current impedance measurements. The optimized NiS/N-CFA nanocomposite exhibits a high specific capacitance of 1,612.5 F·g1at a charge/discharge current density of 1 A·g1and excellent rate capacitance retention of 66.7% at 20 A·g1. The excellent electrochemical properties of NiS/N-CFA nanocomposites make these materials promising electrode materials for supercapacitors. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： NiS cotton wool carbon fiber aerogels N-doping supercapacitors

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Cation-πinteractions regulate electrocatalytic water oxidation over iridium single atoms supported on conjugated polymers

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Science China Chemistry 2024年第6期67卷 2063-2069页

作者： Jing Bai Yunxia Liu Ziwei Ma Shouhan zhang Guojie Chao Haiping Lin Elke Debroye longsheng zhang Tianxi Liu Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an710072China School of Physics and Information Technology Shanxi Normal UniversityXi’an710062China Department of Chemistry KU LeuvenCelestijnenlaan 200FLeuven3001Belgium

Designing cost-effective and high-performing metal catalysts is significant for many renewable energy conversion *** metal loading without sacrificing activity and durability is highly desired for the catalyst design,especially for those reactions where the noble metals deliver the best catalyzing ***-atom catalysts(SACs)with maximal metalatom utilization,homogeneous and tailorable active sites have emerged as promising catalyst candidates,where the local coordination structures of the metal atoms in SACs largely determine the reaction *** design strategies of constructing strong metal-support interactions can stabilize the individual metal atoms in SACs,but present obstacles to provide a flexible manipulation platform for elaborately tailoring the coordination structures to achieve performance optimization towards a specifically targeted ***,for the proof-of-concept study,we report a novel design of SAC with iridium(Ir)single atoms supported on conjugated polymer,in which the adsorption energies of reaction intermediates on Ir atoms and the reaction kinetics towards acidic water oxidation can be readily optimized through modulating the formed cation-πinteractions that can be tailored by adjusting the molecular structures of conjugated *** strategy establishes a general route to develop targeted SACs for various catalytic reactions.

关键词： conjugated polymers single-atom catalysts cation-πinteractions oxygen evolution reaction

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A Tri-Port MIMO Antenna Designed for Micro/Pico Cell Applications with Self-Decoupled Structure

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China Communications 2014年第11期11卷 1-6页

作者： WANG Han LIU longsheng zhang Zhijun State Key Laboratory of Information Science Department of Electronics Engineering Tsinghua University Beijing 100084 P. R. China

A tri-port MIMO antenna designed for Micro/Pico-Cell application is *** is based on printed elements with X-shaped arms,which are oriented to 0°,120° and240° in the azimuth *** arms of these elements are connected,with which a selfdecoupled structure is *** mutual coupling between adjacent elements is below-15 ***,it size is compact and bidirectional radiation patterns with around 4dBi Gain and 92° 3dB beam width is achieved,which can provide good pattern diversity and full azimuth coverage in real applications.

关键词： MIMO antenna antenna diversity mutual coupling

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The Combined Effect of Plastic Particles Size and Concentration on Rotifers’ (Brachionus plicatilis) Performance

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Journal of Ocean University of China 2022年第2期21卷 509-519页

作者： SUI Yanming WANG Senyang MOHSEN Mohamed zhang longsheng SHEN Mengyan LIU Zhiquan NGUYEN Haidang zhang Shengmao LI Kaixing LV Linlan DONG Xuexing School of Marine and Biological Engineering Yancheng Institute of TechnologyYancheng 224002China Department of Animal Production Faculty of AgricultureAl-Azhar UniversityNasr CityCairo 11884Egypt CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China School of Life Sciences East China Normal UniversityShanghai 200241China Research Institute for Aquaculture No.1 Dinh Bang-Tu Son-Bac Ninh 16352Vietnam East China Sea Fishery Research Institute Chinese Academy of Fishery SciencesShanghai 200090China

The presence of microplastics in aquatic ecosystems is of increasing global ***-sized plastics,in particular,can penetrate the cell membrane and cause biological *** study evaluated the combined impacts of several polystyrene mi-crospheres’sizes and nominal concentrations on the overall performance changes of Brachionus *** animals were exposed to three microplastic sizes(0.08,0.5 and 6μm)and five nominal concentrations(0,0.5,2,8,32μg mL−1)for 20 *** results showed that the toxicological effect of particle size on rotifers did not significantly depend on the nominal *** interaction between the nominal concentration and size occurred only for body length and lorica ***,high nominal concentrations of microplastics that were close to nanometer size significantly impaired the overall vitality of rotifers,embodied in shortage of body type,delay in the arrival of maturity,reduction in the cumulative number of neonates,and the advance of the death *** comparison,fair-sized size(0.5 and 6μm)displayed non-significant damage except for individual *** notably,the net reproductive yield was only a third of what it was in the original environment,implying that there was not much fertility ***,with the development of rotifers,the adverse effects of polystyrene microsphere drive had become more and more serious.

关键词： microplastic zooplankton environmental stress life-history parameters

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The development of the region between the preexisting and nascent membranes during the first cleavage of Rana amurensis eggs

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Cell Research 1991年第1期 35-43页

作者： GAO QIRONG, KONGHUA zhang, longsheng HONG,CHENGTANG XU AND GUOYAN GU (formerly KUOYENKU)Shanghai Institute of Cell Biology, Academia Sinica

The region between the preexisting and nascentmembranes of a cleaving Rana egg is a dense protrusionregion of nearly 40μm wide at 180°***,thisregion differentiate,into an upper part,a strip withlong, branched and randomly distributed protrusionswhich are derived largely from the preexistingmembrane,and a lower part,a band with *** 4-and 8-cel1 stages,the strip is almost vanishedand microvilli in the band is *** nascentmembrane is smooth at the 180°stage,then a rough areaappears below the smooth region and quickly *** germ agglutinin which can bind to preexistingmembrane interrupts the development of the regionbetween the preexisting and nascent ***,Brij,having the property to increase the areaof nascent membrane,does not interrupt the developmentof the region between the preexisting and nascentmembranes.

关键词： Gleavaqe region between the preexisting and nascent membranes surface active agents wheat germ agglutinin Rana amurensis eggs.

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INFLUENCE OF RARE EARTH ON INTERGRANULAR CRACKING OF 9% Ni CAST STEEL

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Acta Metallurgica Sinica(English Letters) 1990年第5期3卷 375-378页

作者： zhang Wei LI longsheng CHENG Ji Dalian University of Technology,Dalian,China Lecturer,Dept.of Materials Engineering,Dalian University of Technology,Dalian 116023,China

The intergranular cracking of 9% Ni cast steel seems mainly to relate to the segregation of contaminates H,S and P along *** addition of rare earth may eliminate the seg- regation of these contaminates along grain bou... 详细信息

关键词： 9%Ni cast steel intergranular cracking rare earth

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大兴安岭南段毛登高分异碱长花岗岩成岩时代与地球化学特征

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岩石学报 2022年第3期38卷 855-882页

作者：季根源江思宏张龙升刘翼飞张莉莉中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室北京100037 自然资源实物地质资料中心廊坊065201 华北地质勘查局综合普查大队廊坊065201

毛登矿床位于内蒙古锡林浩特境内,是大兴安岭南段典型的钼铋锡铜矿床,产于阿鲁包格山杂岩体晚阶段侵位的碱长花岗岩和花岗斑岩以及下-中二叠统大石寨组火山角砾岩中。本文以碱长花岗岩为主要研究对象,开展了岩石地球化学、Sr-Nd-Hf同位... 详细信息

毛登矿床位于内蒙古锡林浩特境内,是大兴安岭南段典型的钼铋锡铜矿床,产于阿鲁包格山杂岩体晚阶段侵位的碱长花岗岩和花岗斑岩以及下-中二叠统大石寨组火山角砾岩中。本文以碱长花岗岩为主要研究对象,开展了岩石地球化学、Sr-Nd-Hf同位素、锆石U-Pb定年和微量元素地球化学研究,以探讨成岩时代、岩浆结晶的物理化学条件及其对成矿的制约。研究显示,碱长花岗岩锆石结晶年龄为140.5±0.8Ma,侵位于早白垩世。岩体高硅,富碱,贫钙、镁、铝,富集Rb、F、Th、Nd、Sm、Zr和Hf等元素,亏损Eu、Ba、Sr、P、Nb、Ti和轻稀土等元素,轻、重稀土分馏较小,具稀土四分组效应。碱长花岗岩锆石Ti温度为654~817℃,Ce^(4+)/Ce^(3+)值为0.1~19,岩浆氧逸度lg f(O 2)为-25.7~-18.6,表明原生岩浆为高温、低氧逸度的熔体。岩体具较高的εNd(t)值(-0.1~+2.9)和正的εHf(t)值(+4.0~+9.3)以及年轻的二阶段模式年龄(t Nd DM2=699~940Ma;t HfDM C=600~936Ma),表明岩浆源区来自含大量幔源组分的新生地壳的部分熔融。碱长花岗岩经历了高度分异演化和熔体-流体作用,具高F、低氧逸度特征,是毛登矿区钼、铋、锡、铜金属矿化形成的重要先决条件。

关键词：毛登矿床高分异花岗岩锆石微量元素 U-Pb年龄 Sr-Nd-Hf同位素

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The critical role of electrochemically activated adsorbates in neutral OER

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Science China Materials 2020年第12期63卷 2509-2516页

作者： longsheng zhang Haiyang Yuan Liping Wang Hui zhang Yijing Zang Yao Tian Yunzhou Wen Fenglou Ni Hao Song Haifeng Wang Bo zhang Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced MaterialsFudan UniversityShanghai 200438China Key Laboratory for Advanced Materials Key Laboratory for Advanced MaterialsCentre for Computational Chemistry and Research Institute of Industrial CatalysisEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesCAS Center for Excellence in Superconducting ElectronicsShanghai 200050China Key Laboratory of Systems Bioengineering School of Chemical Engineering and TechnologySynBio Research PlatformCollaborative Innovation Centre of Chemical Science and EngineeringTianjin UniversityTianjin 300072China

Developing efficient electrocatalysts for the oxygen evolution reaction(OER)under neutral conditions is important for microbial electrolysis cells(MECs).However,the OER kinetics in neutral electrolytes at present are extremely sluggish,resulting in high overpotentials that greatly limit the energy conversion efficiencies of *** studies failed to probe the adsorbates on surface metal sites of catalysts at the atomic scale and elucidate their influence on the catalytic activities,which has impeded the rational design of efficient neutral OER catalysts with optimal surface ***,using in situ transmission electron microscopy(TEM),in situ X-ray photoelectron spectroscopy(XPS)and in situ low-energy ion scattering studies,we have identified,for the first time,that the electrochemically activated adsorbates on surface metal sites play a critical role in boosting the neutral OER activities of Ru-Ir binary oxide(RuxIryO2)*** adsorbate-activated RuxIryO2on a glassy carbon electrode achieved a low overpotential of 324 m V at10 m A cm-2in neutral electrolyte,with a 36-fold improvement in turnover frequency compared with that of Ir *** application in an MEC system,the resulting full cell showed a decreased voltage of 1.8 V,200 m V lower than the best value reported to date,facilitating efficient synthesis of poly(3-hydroxybutyrate)from bioelectrochemical *** functional theory(DFT)studies revealed that the enhanced OER activity of RuxIryO2catalyst arose from local structural distortion of adjacent adsorbate-covered Ru octahedra at the catalyst surface and the consequently decreased adsorption energies of OER intermediates on Ir active center.

关键词： electrocatalysis oxygen evolution reaction adsorbates neutral electrolytes

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塌方影响下凤岭隧道贯通施工技术及数值模拟研究

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隧道建设 2016年第4期36卷 465-473页

作者：张龙生翁贤杰江西交通咨询公司江西南昌330008

隧道即将贯通时遭遇塌方,会使贯通面临塌方可靠处理和贯通安全施工双重困难。为保障隧道贯通施工安全,避免塌方,依托江西省昌宁高速公路凤岭隧道在塌方影响下的贯通施工,通过分析研究隧道贯通施工处理过程中的重点和难点,提出综合物理... 详细信息

隧道即将贯通时遭遇塌方,会使贯通面临塌方可靠处理和贯通安全施工双重困难。为保障隧道贯通施工安全,避免塌方,依托江西省昌宁高速公路凤岭隧道在塌方影响下的贯通施工,通过分析研究隧道贯通施工处理过程中的重点和难点,提出综合物理探测、塌方段管棚注浆支护、贯通面合理确定、贯通段管棚注浆支护以及洞身短开挖强支护等系统化的技术方法,并采用三维数值模拟方法对施工过程中围岩、初期支护的应力和位移进行分析,验证施工处理技术的可行性。现场监测结果和处理效果证明,该系统化施工技术体系在塌方影响下的隧道贯通施工是安全有效的。

关键词：凤岭隧道塌方隧道贯通系统化处理技术数值模拟监测

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双壳型覆膜支撑剂DSCP的研制及现场试验

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石油钻探技术 2023年第1期51卷 91-97页

作者：张龙胜王维恒中国石化华东油气分公司石油工程技术研究院江苏南京210004

压裂深层页岩气井时,要求所用支撑剂具有良好的抗压强度和导流能力。为了寻找一种抗压强度高、导流能力好且价格适中的适用于高闭合压力油气井压裂的支撑剂,以酚醛树脂、多元醇聚合物和固化剂等为原材料,采用物理表面涂覆和化学改性相... 详细信息

压裂深层页岩气井时,要求所用支撑剂具有良好的抗压强度和导流能力。为了寻找一种抗压强度高、导流能力好且价格适中的适用于高闭合压力油气井压裂的支撑剂,以酚醛树脂、多元醇聚合物和固化剂等为原材料,采用物理表面涂覆和化学改性相结合的方法,按照一定质量比制备了双壳型覆膜支撑剂DSCP。DSCP内壳的主要成分为酚醛树脂,用于提高抗压强度;外壳的主要成分是惰性合成树脂,在进一步提高抗压强度的同时,提高支撑剂的导流能力。室内评价了DSCP的抗压强度、导流能力等性能,结果为,DSCP在压力69和86 MPa下的破碎率分别为1.21%和2.35%,在温度90℃、压力90 MPa下的导流能力为3.12 mD·cm,表明其具有良好的抗压强度和导流能力。现场试验表明,相较于使用陶粒压裂的水平井,在达到相同压裂规模和相当工艺参数的前提下,使用DSCP时支撑剂费用降低30%左右。研究结果表明,DSCP能够在高闭合压力井压裂中使用,具有较好的推广应用前景。

关键词：支撑剂双层覆膜导流能力研制性能评价现场试验

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