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Boosting K-ion kinetics by interfacial polarization induced by amorphous MoO_(3-x)for MoSe_(2)/MoO_(3-x)@rGO composites

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Journal of Materials Science & Technology 2022年第20期115卷 232-240页

作者： Jiangshao Yang Liwen Liu Daoyi Wang Jianming Tao Yanming Yang Jiaxin Li Yingbin Lin zhigao huang College of Physics and Energy Fujian Normal UniversityFuzhou 350117China Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center Fuzhou 350117China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China

Promoting interfacial reaction kinetics is highly desirable for achieving high-performances of anode material in alkali-ion ***,flower-like MoSe_(2)/MoO_(3-x)@r GO composites are fabricated by a facile solvothermal method involving a thermal-treatment at 800°*** evaluated as an anode material for potassium ion batteries,MoSe_(2)/MoO_(3-x)@r GO delivers 248.2 m A h g^(-1)after 50 cycles at 0.2 A g^(-1) with a capacity retention of 84.6%and 182.9 m A h g^(-1)after 150 cycles at 1.0 A g^(-1) with a capacity retention of almost 61.2%,superior to those of bare MoSe_(2)or MoSe_(2)@r GO *** from electrochemical measurements,the amorphous MoO_(3-x)containing oxygen vacancies could not only effectively buffer the self-aggregation of MoSe_(2)nanosheets but also provides lots of accessible active sites for potassium ion ***,the open channels in the amorphous MoO_(3-x) phase lead to easier ion hopping and smaller diffusion ***,the built-in electric field at the interface would be beneficial for electron transfer and K-ion migration across the hetero-junction ***,larger dielectric polarization induced by the high relative permittivity of amorphous MoO_(3-x) would reduce charge transfer resistance and enhance K-ion migration across electric *** work provides new insight into the enhanced performance of anode material coated by an amorphous layer with large relative permittivity.

关键词： Potassium ion batteries MoSe_(2) Amorphous Work function Heterojunction interface

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Scalable synthesized high-performance TiO_(2)-Si-C hybrid anode for lithium batteries

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Journal of Energy Chemistry 2023年第2期77卷 348-358,I0009页

作者： Liao Shen Chengjie Xu Jingguo Gao Jianming Tao Qiaobao Zhang Yue Chen Yingbin Lin zhigao huang Jiaxin Li College of Physics and Energy Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research CenterFujian Normal UniversityFuzhou 350117FujianChina Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou 350117FujianChina Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117FujianChina Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina

At present,developing a simple strategy to effectively solve the shackles of volume expansion,poor conductivity and interface compatibility faced by Si-C anode in lithium batteries(LIBs)is the key to its ***,low-cost nano-Si powders were prepared from Si-waste of solar-cells by sanding treatment,which can effectively reduce the commercialization cost for Si-C ***,micro-nano structured Gr@Si/C/TiO_(2) anode materials with graphite(Gr)as the inner core,TiO_(2)-doped and carbon-coated Si as the outer coating-layer,were synthesized at kilogram-scale per milling *** characterization results indicate that TiO_(2)-doped carbon layer can improve the interface compatibility with the electrolyte,further promote the reduction of electrode polarization,and finally enhance the battery performance for the Gr@Si/C/TiO_(2) ***,Gr@Si/C/TiO_(2) composites can output excellent LIB performance,especially with high initial coulombic efficiency(ICE)of 82.51%and large average reversible capacity of~810 mA h g^(-1) at 0.8 A g^(-1) after 1000 ***,Gr@Si/C/TiO_(2)‖NCM811 pouch full cells deliver impressive performance especially with high energy density of~489.3 W h kg^(-1) based on the total weight of active materials,suggesting its promising application in the high performance LIBs.

关键词： Lithium-ion batteries Si-C anodes Kilogram-scale preparation Interface compatibility Electrochemical mechanism

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基于刀路的模架快速报价方法

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模具工业 2024年第8期50卷 8-13页

作者：胡浩黄志高陈剑富张博金瑞民华中科技大学材料科学与工程学院湖北武汉430074

在模架成本构成中,加工费难以估算,其中又以型腔加工费用和孔加工费用占比最大,准确估算型腔加工费用和孔加工费用是给出精确模架报价的关键,使用NX二次开发技术,通过分析模架模型的加工刀路,按照加工顺序分别估算粗加工、二次粗加工、... 详细信息

在模架成本构成中,加工费难以估算,其中又以型腔加工费用和孔加工费用占比最大,准确估算型腔加工费用和孔加工费用是给出精确模架报价的关键,使用NX二次开发技术,通过分析模架模型的加工刀路,按照加工顺序分别估算粗加工、二次粗加工、半精加工与精加工的费用,并通过对模型中的孔类进行识别与分类,实现孔加工费用的估算,在此基础上开发模架报价软件。

关键词：模架报价工时估算特征识别 NX二次开发加工工序

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Evolution of Weyl nodes in Ni-doped thallium niobate pyrochlore Tl_(2-x)Ni_(x)Nb_(2)O_(7)

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 104-111页

作者： Yuefang Hu Changming Yue Danwen Yuan Jiacheng Gao zhigao huang Zhong Fang Chen Fang Hongming Weng Wei Zhang Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China Department of Physics University of FribourgFribourg 1700Switzerland Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

The magnetic Weyl semimetal(WSM)is important for fundamental physics and potential applications due to its spontaneous magnetism,robust band topology,and enhanced Berry *** possesses many unique quantum effects,including a large intrinsic anomalous Hall effect,Fermi arcs,and chiral *** this work,using ab initio calculations,we propose that Nidoped pyrochlore Tl2Nb2O7is a magnetic WSM caused by the exchange field splitting on bands around its quadratic band crossing *** exchange field tuned by Ni 3d on-site Coulomb interaction parameter U drives the evolution of Weyl nodes and the resulting topological phase *** Weyl nodes can exist at generic points in the Brillouin zone and are hard to identify exactly,their creation and annihilation,i.e.,the change in their number,chirality,and distribution,have been consistently confirmed with a combined theoretical approach,which employs parity criterion,symmetry indicator analysis,and the Wilson loop of the Wannier *** find that Weyl nodes remain in a large range of U and are close to the Fermi level,which makes the experimental observation very *** think that this method and our proposal of magnetic WSM will be useful in finding more WSMs and add to the understanding of the topological phase transition.

关键词： magnetic Weyl semimetal pyrochlore topological phase transition Chern number anomalous Hall effect

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Excited-state regulation in eco-friendly ZnSeTe-based quantum dots by cooling engineering

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Science China Materials 2022年第6期65卷 1569-1576页

作者： Baoqiang Wu Shuangyi Zhao Mingshui Zhang zhigao huang Chen Chen Zhigang Zang Yue Wang MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsCollege of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044China School of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China

The production of high-quality eco-friendly quantum dots(QDs)is challenging because of the efficient yet elusive nonradiative recombination *** study examined the effects of cooling engineering on regulating the excited states to realize high-quality ZnSeTe core-shell *** presence of ultrafast hot-carrier trapping and band-edge carrier trapping is responsible for the poor emission efficiency in ZnSeTe *** above processes can be suppressed simultaneously by engineering the cooling process,and the underlying mechanisms are interrogated by combined electronic and spectroscopic *** engineered ZnSeTe QDs exhibited record-high efficiency(>90%)and stability that were comparable to those of the canonical CdSe *** on the achievement,the ZnSeTe QD-based white light-emitting diodes(WLEDs)showed excellent optical performance,including a high color-rendering index of 80 and an appropriate correlated color temperature of 7391 ***,the WLEDs could serve as light sources in ecofriendly visible light *** results highlight the feasibility of eco-friendly QDs for practical applications without environmental hazards.

关键词： eco-friendly quantum dot ZnSeTe carrier dynamics white light emission visible light communication

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Magnetism and work function of Ni-Cu alloys as metal gates

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Rare Metals 2012年第2期31卷 130-134页

作者： Cheng, Yanming Zheng, Yongping huang, Xu Zhong, Kehua Chen, zhigao huang, zhigao Department of Physics Fujian Normal University Fuzhou 350007 China

The magnetism and work function of pure Ni(001) and Ni-Cu slab alloys were investigated using first-principles methods based on density functional theory. The calculated results reveal that both magnetic moments and work functions of the alloys depend strongly on the surface orientation, but hardly on the distribution of doped Cu atoms for a given surface orientation. It is found that the doped Cu atoms have evident influence on the magnetic moment of Ni-Cu slabs, and the average magnetic moment of Ni atoms for Ni-Cu alloys decreases with increasing concentration of Cu atoms. Moreover, it is observed that the work function of Ni(001) is insensitive to the supercell thickness and the inner concentration of Cu atoms. In the meantime, the spin polarization is found to have an obvious role on the work function of the Ni-Cu alloys, which may give a new way to modulate the work function of the metal gate.

关键词： first principles magnetism work function

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Theoretical investigation on tunneling magnetoresistance in ferromagnetic/anti-ferromagnetic core/shell system

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Science China(Physics,Mechanics & Astronomy) 2012年第11期55卷 2038-2041页

作者： YANG YanMin huang zhigao College of Physics and Energy Fujian Normal UniversityFuzhou 350007China

Based on Monte Carlo simulations,the effect of structural configuration on the hysteresis behavior and tunneling magnetoresistance(TMR) of composite nanoparticles with ferromagnetic(FM) core/anti-ferromagnetic(AFM) shell is *** simulated results indicate that the coercive field(H c) of composites increases with the decreasing ratio of core-radius(r core) to shell-radius(r shell).When the ratio of r shell to r core is approaching 4:3,H c decreases with increasing AFM *** addition,TMR is found to increase with the decreasing ratio of r core to r shell,resulting from the enhancement of resistance changes in disordered AFM shell.

关键词： tunneling magnetoresistance nano-particle arrays Coulomb blockade effect spin-dependent scattering Monte Carlosimulation

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Hydrogen induced room-temperature ferromagnetism in Co-doped ZnO: first-principles and Monte Carlo study

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Chinese Science Bulletin 2014年第26期59卷 3232-3238页

作者： Jian-Min Zhang zhigao Chen Kehua Zhong Guigui Xu zhigao huang College of Physics and Energy Fujian Normal University Fujian Provincial Key Laboratory of Quantum Manipulation andNew Energy Materials

The structural stability, vibrational and magnetic properties of hydrogen doped ZnO:Co have been studied by first-principles calculations based on density functional theory. Bond-center(BC) sites were identified to be most stable sites for hydrogen, the corresponding vibrational frequencies including anharmonic contributions were calculated. Its magnetic properties were investigated as well. The calculated results reveal that hydrogen could induce the change of electronic transfer, leading to a decrease of magnetic moment. However, the magnetic coupling between Co atoms is greatly strengthen. The results simulated by Monte Carlo method indicate that hydrogen can induce the Curie temperature to increase from 200 to 300 K.

关键词：蒙特卡罗法钴掺杂第一性原理氧化锌铁磁性第一原理计算氢室温

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Surface modification of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 with Cr_2O_3 for lithium ion batteries

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Rare Metals 2012年第2期31卷 140-144页

作者： Li, Xiaowei Lin, Yingbin Liin, Ying Lai, Heng huang, zhigao Physics Department Fujian Normal University Fuzhou 350007 China

Cr 2 O 3-coated LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode materials were synthesized by a novel method. The structure and electrochemical properties of prepared cathode materials were measured using X-ray diffraction (XRD), scanning electron microscopy (SEM), charge-discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The measured results indicate that surface coating with 1.0 wt% Cr 2 O 3 does not affect the LiNi 1/3 Co 1/3 Mn 1/3 O 2 crystal structure (α-NaFeO 2 ) of the cathode material compared to the pristine material, the surfaces of LiNi 1/3 Co 1/3 Mn 1/3 O 2 samples are covered with Cr 2 O 3 well, and the LiNi 1/3 Co 1/3 Mn 1/3 O 2 material coated with Cr 2 O 3 has better electrochemical performance under a high cutoff voltage of 4.5 V. Moreover, at room temperature, the initial discharging capacity of LiNi 1/3 Co 1/3 Mn 1/3 O 2 material coated with 1.0 wt.% Cr 2 O 3 at 0.5C reaches 169 mAh·g 1 and the capacity retention is 83.1% after 30 cycles, while that of the bare LiNi 1/3 Co 1/3 Mn 1/3 O 2 is only 160.8 mAh·g 1 and 72.5%. Finally, the coated samples are found to display the improved electrochemical performance, which is mainly attributed to the suppression of the charge-transfer resistance at the interface between the cathode and the electrolyte.

关键词： lithium ion batteries LiNi 1/3 Co 1/3 Mn 1/3 O 2 Cr 2 O 3 coating

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Nano-crystalline FeOOH mixed with SWNT matrix as a superior anode material for lithium batteries

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Journal of Energy Chemistry 2014年第4期23卷 513-518页

作者： Mingzhong Zou Weiwei Wen Jiaxin Li Yingbin Lin Heng Lai zhigao huang College of Physics and Energy Fujian Normal University State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences

Nano-crystalline FeOOH particles （5-10 nm） have been uniformly mixed with electric matrix of single-walled carbon nanotubes （SWNTs） for forming FeOOH/SWNT composite via a facile ultrasonication method. Directly using the FeOOH/SWNT composite （containing 15 wt% SWNTs） as anode material for lithium battery enhances kinetics of the Li＋ insertion/extraction processes, thereby effectively improving re- versible capacity and cycle performance, which delivers a high reversible capacity of 758 mAh.g-1 under a current density of 400 mA.g-1 even after 180 cycles, being comparable with previous reports in terms of electrochemical performance for FeOOH anode. The good electrochemical performance should be ascribed to the small particle size and nano-crystalline of FeOOH, as well as the good electronic conductivity of SWNT matrix.

关键词： FeOOH/SWNT composite electrochemical properties energy storage lithium batteries anode material

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