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Electrochemical Activation-Induced Structural Transformation in Ni(OH)_(2)/Ti_(3)C_(2)T_(x)/NF Systems with Enhanced Electrochemical Performance for Hybrid Supercapacitors

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Energy & Environmental Materials 2024年第4期7卷 277-284页

作者： Chuming Xu Lu dai Yiming Zhao Shuang Li Yapan Wu Xueqian Wu Gaixia Zhang Shuhui Sun Dongsheng Li College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China Hubei Three Gorges Laboratory Yichang 443007China Department of Electrical Engineering École de Technologie Supérieure(ÉTS)MontréalQuébec H3C 1K3Canada Institut National de la Recherche Scientifique(INRS) CentreÉnergie Matériaux TélécommunicationsVarennesQuébec J3X 1P7Canada

Exploring a novel strategy for large-scale production of battery-type Ni(OH)_(2)-based composites,with excellent capacitive performance,is still greatly ***,we developed a facile and cost-effective strategy to in situ grow a layer of Ni(OH)_(2)/Ti_(3)C_(2)T_(x)composite on the nickel foam(NF)collector,where Ti_(3)C_(2)T_(x)is not only a conductive component,but also a catalyst that accelerates the oxidation of NF to Ni(OH)_(2).Detailed analysis reveals that the crystallinity,morphology,and electronic structure of the integrated electrode can be tuned via the electrochemical activation,which is beneficial for improving electrical conductivity and redox *** expected,the integrated electrode shows a specific capacity of 1.09 C cm^(-2)at 1 mA cm^(-2)after three custom activation cycles and maintains 92.4%of the initial capacity after 1500 ***,a hybrid supercapacitor composed of Ni(OH)_(2)/Ti_(3)C_(2)T_(x)/NF cathode and activated carbon anode provides an energy density of 0.1 mWh cm^(-2)at a power density of 0.97 mW cm^(-2),and excellent cycling stability with about 110%capacity retention rate after 5000 *** work would afford an economical and convenient method to steer commercial Ni foam into advanced Ni(OH)_(2)-based composite materials as binder-free electrodes for hybrid supercapacitors.

关键词： electrochemical activation hybrid supercapacitors Ni(OH)_(2) Ti_(3)C_(2)T_(x)

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Metal-organic framework derived NiFe_(2)O_(4)/FeNi_(3)@C composite for efficient electrocatalytic oxygen evolution reaction

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International Journal of Minerals,Metallurgy and Materials 2023年第10期30卷 1914-1921页

作者： Fangna dai Zhifei Wang Huakai Xu Chuanhai Jiang Yuguo Ouyang Chunyu Lu Yuan Jing Shiwei Yao Xiaofei Wei School of Materials Science and Engineering China University of PetroleumQingdao 266580China

Reducing the cost and improving the electrocatalytic activity are the key to developing high efficiency electrocatalysts for oxygen evolution reaction(OER).Here,bimetallic NiFe-based metal-organic framework(MOF)was prepared by solvothermal method,and then used as precursor to prepare NiFe-based MOF-derived materials by *** effects of different metal ratios and pyrolysis temperatures on the sample structure and OER electrocatalytic performance were investigated and *** experimental results showed that when the metal molar ratio was Fe:Ni=1:5 and the pyrolysis temperature was 450℃,the sample(FeNi_(5)-MOF-450)exhibits a composite structure of Ni Fe_(2)O_(4)/FeNi_(3)/C and owns the superior electrocatalytic activity in *** the current density is 100 mA·cm^(-2),the overpotential of the sample was 377 mV with Tafel slope of 56.2 mV·dec^(-1),which indicates that FeNi_(5)-MOF-450 exhibits superior electrocatalytic performance than the commercial RuO_(2).Moreover,the long-term stability of FeNi_(5)-MOF-450 further promotes its development in *** work demonstrated that the regulatory methods such as component optimization can effectively improve the OER catalytic performance of NiFe-based MOF-derived materials.

关键词： metal-organic framework derivatives NiFe-based electrocatalysts electrocatalytic performance oxygen evolution reaction

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三元Fe-Co-Si合金中金属间化合物的生长特性研究

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西北工业大学学报 2008年第4期26卷 399-403页

作者：万小波代富平阮莹魏炳波西北工业大学应用物理系陕西西安710072

通过DSC热分析确定了三元Fe－32．29％Co－20．33％Si合金的固相面和液相面温度分别为1148K和1535K。采用熔融玻璃净化技术实现了该合金的深过冷与快速凝固，最大过冷度达378K（0．25TL）。当过冷度为98～378K时，合金凝固组织由α（Co... 详细信息

通过DSC热分析确定了三元Fe－32．29％Co－20．33％Si合金的固相面和液相面温度分别为1148K和1535K。采用熔融玻璃净化技术实现了该合金的深过冷与快速凝固，最大过冷度达378K（0．25TL）。当过冷度为98～378K时，合金凝固组织由α（Co，Fe）2Si和（Fe，Co）sSi3相组成。分析确定该合金熔体开始凝固时，首先析出亚稳的过饱和β（Co，Fe）。Si固溶体，随后发生脱溶转变析出第2相（Fe，Co）5Si3，亚稳的β（Co，Fe）2Si转变为稳定的α（Co，Fe）2Si。研究发现，随着过冷度的增大，β（Co，Fe）2Si枝晶生长速度呈指数增长趋势。

关键词：深过冷三元合金金属间化合物相组成枝晶生长

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Bioinspired Hemostatic Strategy via Pulse Ejections for Severe Bleeding Wounds

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Research 2024年第1期2023卷 281-299页

作者： Bitao Lu Enling Hu Weiwei Ding Wenyi Wang Ruiqi Xie Kun Yu Fei Lu Guangqian Lan Fangyin dai State Key Laboratory of Silkworm Genome Biology College of SericultureTextile and Biomass SciencesSouthwest UniversityChongqing 400715China Chongqing Engineering Research Center of Biomaterial Fiber and Modern Textile Chongqing 400715China Division of Trauma and Surgical Intensive Care Unit Research Institute of General SurgeryJinling HospitalMedical School of Nanjing UniversityNanjing210002 Jiangsu ProvinceChina Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong KongChina

Efficient hemostasis during emergency trauma with massive bleeding remains a critical challenge in prehospital ***,multiple hemostatic strategies are critical for treating large bleeding *** this study,inspired by bombardier beetles to eject toxic spray for defense,a shape-memory aerogel with an aligned microchannel structure was proposed,employing thrombin-carrying microparticles loaded as a built-in engine to generate pulse ejections for enhanced drug *** aerogels,after contact with blood,can rapidly expand inside the wound,offering robust physical barrier blocking,sealing the bleeding wound,and generating a spontaneous local chemical reaction causing an explosivelike generation of CO_(2) microbubbles,which provide propulsion thrust to accelerate burst ejection from arrays of microchannels for deeper and faster drug *** ejection behavior,drug release kinetics,and permeation capacity were evaluated using a theoretical model and experimentally *** novel aerogel showed remarkable hemostatic performance in severely bleeding wounds in a swine model and demonstrated good degradability and biocompatibility,displaying great potential for clinical application in humans.

关键词： wound sealing offering

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Implementation of LDA+ Gutzwiller with Newton's method

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Chinese Physics B 2017年第1期26卷 391-398页

作者： Jian Zhang Ming-Feng Tian Guang-Xi Jin Yuan-Feng Xu Xi dai Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China LCP Institute of Applied Physics and Computational Mathematics Beijing 100088 China CAEP Software Center for High Performance Numerical Simulation Beijing 100088 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

In order to calculate the electronic structure of correlated materials, we propose implementation of the LDA＋Gutzwiller method with Newton＇s method. The self-consistence process, efficiency and convergence of calculation are improved dramatically by using Newton＇s method with golden section search and other improvement *** compare the calculated results by applying the previous linear mix method and Newton＇s method. We have applied our code to study the electronic structure of several typical strong correlated materials, including SrVO3, LaCoO3, and La2O3Fe2Se2. Our results fit quite well with the previous studies.

关键词： LDA+Gutzwiller strongly correlated electrons Newton's method

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A novel ω-conotoxin Bu8 inhibiting N-type voltage-gated calcium channels displays potent analgesic activity

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Acta Pharmaceutica Sinica B 2021年第9期11卷 2685-2693页

作者： Jinqin Chen Xinhong Liu Shuo Yu Jia Liu Rongfang Chen Yunxiao Zhang Ling Jiang Qiuyun dai Beijing Institute of Biotechnology Beijing 100071China Key Laboratory of Magnetic Resonance in Biological System State Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsWuhan Center for Magnetic ResonanceInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China College of Life Science Hunan Normal UniversityChangsha 410081China University of Chinese Academy of Sciences Beijing 100049China

ω-Conotoxins inhibit N-type voltage-gated calcium(Ca_(v)2.2)channels and exhibit efficacy in attenuating neuropathic pain but have a low therapeutic ***,we synthesized and characterized a novelω-conotoxin,Bu8 from Conus bullatus,which consists of 25 amino acid residues and three disulfide ***8 selectively and potently inhibits depolarization-activated Ba^(2+ )currents mediated by rat Ca_(v)2.2 expressed in HEK293 T cells(IC_(50)=89 nmol/L).Bu8 is two-fold more potent thanω-conotoxin MVIIA,aω-conotoxin currently used for the treatment of severe chronic *** also displays potent analgesic activity in animal pain models of hot plate and acetic acid writhing but has fewer side effects on mouse motor function and lower toxicity in *** lower side effects may be attributed to its faster binding rate and higher recovery *** NMR structure demonstrates that Bu8 contains a small irregular tripleβ-*** structure-activity relationships of Bu8 Ala mutants and Bu8/MVIIA hybrid mutants demonstrate that the binding mode of Ca_(v)2.2 with the amino acid residues in loop 1 and loop 2 of Bu8 is different from that of *** study characterizes a novel,more potentω-conotoxin and provides new insights for designing Ca_(v)2.2 antagonists.

关键词： N-type calcium ion channel ω-conotoxin Bu8 Analgesic activity Structure-activity relationship

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Fossil bacteria in Xuanlong iron ore deposits of Hebei Province

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Science China Earth Sciences 2004年第4期47卷 347-356页

作者： dai Yongding, SONG Haiming & SHEN Jiying Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029, China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

Discovered in Early Proterozoic Xuanlong iron ore deposits are six genera of fossil iron bacteria, i. e. sphere (coenobium of) rod-shaped (monomer) Naumanniella, ellipsoid elliptical Ochrobium,sphere spherical Siderocapsa and chain spherical Siderococcus, chain rod-shaped Leptothrix and Lieskeella, and six genera of fossil blue bacteria, namely sphere spherical Gloeocapsa, Synechocystis and Globobacter, chain spherical Anabaena and Nostoc, and con-strictive septate tubular Nodularia. The biomineralized monomers and coenobia of the two cate-gories of bacteria, together with hematite plates made up the bacteria pelletal, bacteria silky, bacteria fibrous and clasty bacteria pelletal textural lamina. The bacteria pelletal laminae com-bined with other bacteria laminae to make up oncolite, stromatolite and laminate. The precipita-tion of iron oxide was accelerated due to iron and blue bacteria cohabiting on microbial film or mat. The Xuanlong iron ore deposits are microbial binding ore deposits of ocean source.

关键词： iron and blue bacteria, bacteria textural lamina, microbial ore deposits, Late Early Proterozoic.

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海带(Laminaria japonica)丝状体遗传多样性的比较研究

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生物多样性 1999年第3期7卷 197-201页

作者：王莹戴继勋河南职业技术师范学院青岛海洋大学

采用垂直板式聚丙烯酰胺凝胶电泳技术对分别来自中国青岛与日本北海道海带（Ｌａｍｉｎａｒｉａｊａｐｏｎｉｃａ）丝状体的６种酶系统（乙醇脱氢酶、谷氨酸脱氢酶、异柠檬酸脱氢酶、乳酸脱氢酶、山梨醇脱氢酶和超氧化物歧化酶）进行了... 详细信息

采用垂直板式聚丙烯酰胺凝胶电泳技术对分别来自中国青岛与日本北海道海带（Ｌａｍｉｎａｒｉａｊａｐｏｎｉｃａ）丝状体的６种酶系统（乙醇脱氢酶、谷氨酸脱氢酶、异柠檬酸脱氢酶、乳酸脱氢酶、山梨醇脱氢酶和超氧化物歧化酶）进行了检测，发现存在２２个基因位点，分析了不同来源海带丝状体的遗传多样性与遗传分化程度。结果表明：日本北海道海带丝状体的预期杂合度、每个位点有效等位基因数等遗传参数均大于中国青岛海带丝状体。对日本北海道海带丝状体与中国青岛海带丝状体的遗传相似系数和遗传距离进行了计算分析，显示两者发生了遗传分化。日本北海道海带丝状体的遗传多样性高于中国青岛海带丝状体。研究结果还发现在中国青岛海带丝状体的Ｉｄｈ、Ｌｄｈ和Ｓｄｈ中，以及日本北海道海带丝状体的Ａｄｈ、Ｇｄｈ、Ｉｄｈ、Ｌｄｈ、Ｓｄｈ和Ｓｏｄ中存在着不同迁移率的不等距双带酶，可能由特殊基因控制，并集中在第３个基因位点上。

关键词：海带聚丙烯酰胺凝胶电泳遗传多样性丝状体

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Controllable Subspaces of Open Quantum Dynamical Systems

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Communications in Theoretical Physics 2008年第1期49卷 61-64页

作者： ZHANG Ming dai Hong-Yi GONG Er-Ling XIE Hong-Wei HU De-Wen College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China College of Science National University of Defense Technology Changsha 410073 China

This paper discusses the concept of controllable subspace for open quantum dynamical systems. It is constructively demonstrated that combining structural features of decoherence-free subspaces with the ability to perform open-loop coherent control on open quantum systems will allow decoherence-free subspaces to be controllable. This is in contrast to the observation that open quantum dynamical systems are not open-loop controllable. To a certain extent, this paper gives an alternative control theoretical interpretation on why decoherence-free subspaces can be useful for quantum computation.

关键词： quantum dynamical systems controllability decoherence-free subspace

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Intercalation-deintercalation design in MXenes for high-performance supercapacitors

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Nano Research 2022年第4期15卷 3213-3221页

作者： Zhenjiang Li Jun dai Yiran Li Changlong Sun Alan Meng Renfei Cheng Jian Zhao Minmin Hu Xiaohui Wang School of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266061China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China State Key Laboratory Base of Eco-chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

MXene is a new intercalation pseudocapacitive electrode material for supercapacitor *** fast ion diffusion is significantly essential for MXene to achieve excellent electrochemical *** expansion of interlayer void by traditional spontaneous species intercalation always leads to a slight increase in capacitance due to the existence of species sacrificing the smooth diffusion of electrolyte ***,an effective intercalation-deintercalation interlayer design strategy is proposed to help MXene achieve higher *** cation intercalation leads to the expansion of interlayer *** electrochemical cation extraction,intercalated cations are deintercalated mostly,leaving a small number of cations trapped in the interlayer silt and serving as pillars to maintain the interlayer space,offering an open,unobstructed interlayer space for better ion migration and ***,a preferred surface with more-O terminations for redox reaction is created due to the reaction between cations and-OH *** a result,the processed MXene delivers a much improved capacitance compared to that of the original Ti_(3)C_(2)T_(x)electrode(T stands for the surface termination groups,such as-OH,-F,and-O).This study demonstrates an improvement of electrochemical performance of MXene electrodes by controlling the interlayer structure and surface chemistry.

关键词： MXene electrochemical ion intercalation−deintercalation interlayer design supercapacitor energy storage

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