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Tempura-like carbon/carbon composite as advanced anode materials for K-ion batteries

Journal of Energy Chemistry 2021年第8期30卷 589-598,I0012页

作者： hao-Jie Liang Zhen-Yi Gu Xue-Ying Zheng Wen-hao Li Ling-yun Zhu Zhong-Hui Sun yun-feng Meng Hai-Yue Yu Xian-Kun Hou Xing-Long Wu MOE Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal UniversityChangchun 130024China Key Laboratory of Preparation and Application of Environmental Friendly Materials(Jilin Normal University) Ministry of EducationChangchun 130103China Institute of New Energy for Vehicles Tongji University201804 ShanghaiChina CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology100190 BeijingChina Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringMOE Key Laboratory for Water Quality and Conservation of the Pearl River DeltaGuangzhou UniversityGuangzhou 510006China National&Local United Engineering Laboratory for Power Batteries Faculty of ChemistryNortheast Normal UniversityChangchun 130024China

Graphite as a promising anode candidate of K-ion batteries(KIBs)has been increasingly studied currently,but corresponding rate performance and cycling stability are usually inferior to amorphous carbon *** protect the layer structure and further boost performance,tempura-like carbon/carbon nanocomposite of graphite@pitch-derived S-doped carbon(G@PSC)is designed and prepared by a facile and low-temperature modified molten salt *** robust encapsulation structure makes their respective advantages complementary to each other,showing mutual promotion of electrochemical performances caused by synergy *** a result,the G@PSC electrode is applied in KIBs,delivering impressive rate capabilities(465,408,370,332,290,and 227 m A h g^(-1)at 0.05,0.2,0.5,1,2,and 5 A g^(-1))and ultralong cyclic stability(163 m A g^(-1)remaining even after 8000 cycles at 2 A g^(-1)).On basis of ex-situ studies,the sectionalized K-storage mechanism with adsorption(pseudocapacitance caused by S doping)-intercalation(pitch-derived carbon and graphite)pattern is ***,the exact insights into remarkable rate performances are taken by electrochemical kinetics tests and density functional theory *** a word,this study adopts a facile method to synthesize high-performance carbon/carbon nanocomposite and is of practical significance for development of carbonaceous anode in KIBs.

关键词： K-ion batteries Anode materials Carbon/carbon composite S doping Cyclic stability DFT calculation

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Enhancing oxygen reduction reaction of Pt-Co/C nanocatalysts via synergetic effect between Pt and Co prepared by one-pot synthesis

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Rare Metals 2023年第1期42卷 146-154页

作者： yun-feng Wu Ji-Wei Ma yun-Hui Huang School of Materials Science and Engineering Tongji UniversityShanghai201804China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Designing highly active and durable electrocatalysts towards oxygen reduction reaction(ORR)plays a paramount importance for proton exchange membrane fuel ***-based binary alloys Pt-M(M=3d-transition metals)possessing excellent electronic and geometric properties have received increasing interests as highly active ***,we report a series of Pt_(x)Co/C(x=1,2,3)catalysts by a facile one-pot soft-chemistry *** the acidic conditions,the mass activities of PtCo/C,Pt_(2)Co/C and Pt_(3)Co/C are 0.526,0.462 and 0.441 A·mgPt^(-1),which are 2.60,2.31 and 2.22 times higher than that of Pt/C(0.200 A·mgPt^(-1)),*** specific activities of PtCo/C,Pt_(2)Co/C and Pt_(3)Co/C are 706.59,679.41 and 801.83μA·cm^(-2),which are accordingly 2.89,2.76 and 3.28 times higher than that of Pt/C(244.75μA·cm^(-2)).Notably,Pt_(3)Co/C shows a remarkable *** 5000 cycles of the accelerated durability testing,the mass activity and specific activity of Pt_(3)Co/C catalyst are 2.47 and 3.80 times higher than that of the commercial Pt/C,*** improved ORR activity and durability can be ascribed to the synergistic interaction between Pt and Co.

关键词： Proton exchange membrane fuel cells(PEMFCs) Pt_(x)Co/C catalysts Synergetic effect Oxygen reduction reaction(ORR) One-pot synthesis

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Particle deposition patterns on high-pressure turbine vanes with aggressive inlet swirl

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Chinese Journal of Aeronautics 2022年第3期35卷 75-89页

作者： Xing YANG Zihan hao Zhenping feng Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment Institute of TurbomachinerySchool of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China

Characteristics of particle migration and deposition were numerically investigated in presence of aggressive swirl at the turbine *** isolated effects of the inlet swirl were considered in detail by shifting the circumferential position of the swirl and by implementing positive and negative swirling *** were released from the turbine inlet and the resulting deposition on the vanes was determined by using the critical velocity model in a range of particle diameters from 1 to 25 *** show that the particles are more likely to move outwards to the boundary walls of the passage by the action of the swirling ***,this could be relieved by increasing the particle *** imbalance problem of the deposition is found between the adjacent vanes,which could introduce additional inlet non-uniformities towards the downstream rotor and thus accelerate performance degradation of the turbine ***,the negative swirl case has higher overall capture efficiency within the entire turbine than the positive swirl case for larger particles,and when the inlet swirl is shifted to the mid-passage of the turbine,more deposits could be produced in comparison with the case in which the swirl aims at the vane leading edge.

关键词： Combustor-turbine interaction Gas turbine Inlet swirl Numerical simulation Particle deposition

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Study of the Classical Cassie Theory and Wenzel Theory Used in Nanoscale

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Journal of Bionic Engineering 2021年第2期18卷 398-408页

作者： hao Li Xiaolei feng Kai Zhang School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao 266580China National Engineering Laboratory of Offshore Geophysical and Exploration Equipment China University of PetroleumShandong 266580China

Recently,there are hesitations in the application scope of the classical Cassie theory and Wenzel *** this paper,Molecular Dynamics(MD)simulations are used to study these two theories used in the nanoscale and find their *** effect of parameters including solid fractions(or roughness factors),arrangement of pillars(with same solid fractions),pillar height,and droplet size on contact angles was *** shows that the Cassie equation is suitable for droplets on uniform pillared surfaces including different solid fractions,arrangement of pillars and pillar height,when there is no meniscus of *** Wenzel equation is also suitable for droplets on uniform pillared surfaces including different roughness factors,arrangement of pillars and pillar ***,whether the droplet size has an influence on the contact angle depends on the pinned place of the contact *** the Wenzel state,the contact line is pinned although increasing the droplet size,resulting in increasing the contact angle,while the contact angle decreases to the initial value again when the droplet size increases enough to allow the contact line moving to the next *** results provide insights toward the wettability of droplets on surfaces in nanoscale.

关键词： wettability Cassie theory Wenzel theory nanoscale molecular dynamics simulations

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Stream cipher designs: a review

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Science China(Information Sciences) 2020年第3期63卷 80-104页

作者： Lin JIAO Yonglin hao Dengguo feng State Key Laboratory of Cryptology State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences

Stream cipher is an important branch of symmetric cryptosystems, which takes obvious advantages in speed and scale of hardware implementation. It is suitable for using in the cases of massive data transfer or resource constraints, and has always been a hot and central research topic in cryptography. With the rapid development of network and communication technology, cipher algorithms play more and more crucial role in information security. Simultaneously, the application environment of cipher algorithms is increasingly complex, which challenges the existing cipher algorithms and calls for novel suitable designs. To accommodate new strict requirements and provide systematic scientific basis for future designs, this paper reviews the development history of stream ciphers, classifies and summarizes the design principles of typical stream ciphers in groups, briefly discusses the advantages and weakness of various stream ciphers in terms of security and implementation. Finally, it tries to foresee the prospective design directions of stream ciphers.

关键词： stream cipher survey lightweight authenticated encryption homomorphic encryption

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Review on anti-loosening methods for threaded fasteners

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Chinese Journal of Aeronautics 2022年第2期35卷 47-61页

作者： hao GONG Jianhua LIU Huihua feng School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

Threaded fasteners naturally tend to loosen under vibration,impact,or alternating thermal *** anti-loosening methods or strategies are widely applied for preventing loosening,including a few anti-loosening designs and anti-loosening *** this review,a variety of influencing factors that improved the anti-loosening ability and helped guide the anti-loosening designs of threaded fasteners are ***,the anti-loosening structures are classified into two categories,that is,conventional and new-style anti-loosening *** former refers to widely used structures in engineering applications,while the latter refers to novel structures not available in the *** research on the evaluation and comparison of various conventional anti-loosening structures in terms of preventing loosening is summarized in detail and the newstyle anti-loosening structures from five different aspects are also surveyed based on different structural *** the future,the effects of combined factors on loosening should be considered to achieve optimal anti-loosening *** quantitative research on the mathematical relationship between the anti-loosening performance of conventional structures and structural parameters must be ***,novel structures with excellent abilities to prevent loosening are needed,and issues of difficulties in installation and disassembly,low strength at thread,large deformation,and temperature dependence also need to be addressed.

关键词： Anti-loosening designs Anti-loosening structures Bolted joints Loosening failure Preload test

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Angle-Dependent Irradiation of C_(4) in Femtosecond Laser Pulses

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Chinese Physics Letters 2012年第7期29卷 71-74页

作者： WANG Zhi-Ping ZHANG feng-Shou ZHU yun XIE Guan-hao School of Science Jiangnan UniversityWuxi 214122 The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875

We study the angle-dependent irradiation of linear C_(4) in the strong femtoeecond laser pulses with the help of time-dependent local density approximation applied to valence electrons,coupled non-adiabatically to molecular dynamics of *** is found that the excitation of C_(4) including the electrons and ions has a strong relation to the angle between the laser polarization and the internuclear axis of *** ionization yield decreases when theangle ranges from 0 to π/2.A clear suppression in the ionization yield is found when the laser polarization is perpendicular to the internuclear axis of C_(4).We track the dynamic motion of ionized C_(4) even in the relaxation *** shows that the ionized C_(4) keeps on oscillating without fragmenting after the irradiation in different cases,while it is more excited when the laser polarization is along the internuclear ***,it is found that the change of the ELF takes place mainly in the xy plane and xz plane and the electron ejection mainly comes from the middle two atoms for the θ =0 case.

关键词： polarization Femto Angle

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The Equilibrium Coefficient Kp and Petroleum Exploration:Design of the New Generation of Petroleum Exploration Instrument

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Acta Geologica Sinica(English Edition) 2000年第3期74卷 685-691页

作者： feng Weiheng feng yun Shanghai Gamma Ray Technology Shanghai 201108

The main reason why the application of nuclear technology in petroleum exploration has not yet been accepted by most exploration workers is that they are not clear about the homologous distribution features of oil and gas fields and radioactive radiation. The authors hold that the disequilibrium of uranium, radium and radon as a natural radioactive series is the basic feature in the use of this technology in petroleum exploration. The invention Gamma-ray Spectral Measurement of the Equilibium Coefficient Kp and Its Embodiment of the senior author now can readily solve that problem and replace the impedient measure of normalization of uranium and potassium to thorium that had to be proposed before. Application of this impedient measure has some limitations. In areas where the surface is covered by beach or river sands, thorium minerals such as monazite may be concentrated by placering. This could result in local thorium highs that would yield local uranium and potassium lows after normalization to thorium, and these would constitute false anomalies.

关键词： petroleum deposit reducing environment in-situ measurement gamma-ray spectrometer equilibrium coefficient

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Density-functional-theory formulation of classical and quantum Hooke's law

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Science China(Technological Sciences) 2014年第4期57卷 692-698页

作者： HU hao LIU feng Department of Materials Science and Engineering University of Utah

A fundamental property of solid materials is their stress state. Stress state of a solid or thin film material has profound effects on its thermodynamic stability and physical and chemical properties. The classical mechanical stress （σ^M） originates from lat- tice strain （e）, following Hooke＇s law： σ^M=Cε, where C is elastic constant matrix. Recently, a new concept of quantum electronic stress （o-QE） is introduced to elucidate the extrinsic electronic effects on the stress state of solids and thin films, which follows a quantum analog of classical Hooke＇s law： ~QE=E（An）, where E is the deformation potential of electronic states and An is the variation of electron density. Here, we present mathematical derivation of both the classical and quantum Hooke＇s law from density functional theory. We further discuss the physical origin of quantum electronic stress, arising purely from electronic excitation and perturbation in the absence of lattice strain （g=0）, and its relation to the degeneracy pressure of electrons in solid and their interaction with the lattice.

关键词： stress in the solid quantum electronic stress quantum Hooke's law density functional theory

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Antibacterial property,corrosion and discoloration resistance of pure copper containing Zn or Ni

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Rare Metals 2022年第12期41卷 4041-4046页

作者： yun Jiang Wen-Jing Zhang Xu-Jun Mi Guo-Jie Huang hao-feng Xie Xue feng Li-Jun Peng Zhen Yang State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.LtdBeijing 100088China GRIMAT Engineering Institute Co. LtdBeijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

This study focused on the effects of Zn and Ni addition on the antibacterial properties and corrosion resistance of copper *** antimicrobial properties of copper and copper alloys were evaluated using Escherichia coli... 详细信息

关键词： corrosion resistance alloys

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