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Integration of urchin-like MnCo_(2)O_(4)@C core–shell nanowire arrays within porous copper current collector for superior performance Li-ion battery anodes

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Rare Metals 2024年第2期43卷 599-611页

作者： Xue-Ru Zhang Qiong wu Yong Zhang Xi-Fei Li Ting Xie yu-cheng wu Instrumental Analysis Center Hefei University of TechnologyHefei230009China Key Laboratory of Advanced Functional Materials and Devices of Anhui Province Hefei230009China School of Materials Science and Engineering Hefei University of TechnologyHefei230009China Institute of Advanced Electrochemical Energy Xi’an University of TechnologyXi’an710048China

Spinel MnCo_(2)O_(4) is a promising energy storage candidate as anode materials in lithium-ion batteries owing to synergistic effects of two intrinsic solid-state redox ***,low conductivity,poor rate capacity and rapid capacity fading have seriously impaired its practical *** overcome the inferiorities,urchin-like MnCo_(2)O_(4)@C core–shell nanowire arrays have been fabricated directly within a porous copper current collector via a facile hydrothermal method followed by a chemical vapor deposition carbonization *** a typical nanowire,the core is composed of interconnected MnCo_(2)O_(4)nanoparticles and the shell shows as a thin amorphous carbon *** integrated MnCo_(2)O_(4)@C/Cu structure could act as working anodes without using additives or polymer *** MnCo_(2)O_(4)@C/Cu possesses slightly longer Li-ion insertion/desertion pathway than that of MnCo_(2)O_(4)/Cu,the carbon shell could effectively prevent the pulverization of MnCo_(2)O_(4) and lower down charge transfer resistance and actively participate in Li-ion *** rearrangement of carbon atoms during lithiation/delithiation cycling could inhibit the formation of passive solid electrolyte interphase *** a result,the MnCo_(2)O_(4)@C/Cu electrode presents superior rate capacity(600 mAh·g^(−1) at 1 A·g^(−1)) and better stability(797 mAh·g^(−1) after 200 cycles at 100 mA·g^(−1)).The excellent reversible Li ion storage capacity,cycling stability and rate capacity endow MnCo_(2)O_(4)@C/Cu great potential as stable and high output integrated anode materials in Li-ion batteries.

关键词： MnCo_(2)O_(4)@C Urchin-like nanowire arrays Core-shell Integrated anode materials Lithium-ion batteries

Effects of different alloying elements M(M=Fe,Ni,Mn,Si,Mo,Cu,Y)on Cr_(2)0_(3)with Cl:a first-principles study

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Journal of Iron and Steel Research International 2021年第5期28卷 613-620页

作者： Ya-nan Niu Nan Dong Si Liu Jing Yang Pei-de Han yu-cheng wu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Shanxi Engineering Technology Research Center for Energy Materials and Analysis and Testing Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Using the first-principles methods,the effects of different alloying elements M(M=Fe,Ni,Mn,Si,Mo,Cu,Y)on Cr_(2)0_(3)with Cl adsorption are *** results show that the layer distance of all doped models has been widened to different degrees with Cl *** Mo or Y is doped into the passive film,the difference of layer distance is reduced to a certain *** interaction between alloying elements and Cl is studied by calculating the adsorption height,bond population and electron density *** results show that Mo and Y can inhibit Cl erosion and improve the corrosion resistance of passive ***,we investigate the CrMoFe and CrMoY co-doped system with Cl *** calculations point out that when Mo and Y are doped together in the passive film,the corrosion resistance of the system is more prominent than that of CrMo,CrY and CrMoFe co-doping systems.

关键词： Density functional theory Cr_(2)0_(3) Doping Cl Austenitic stainless steel

Direct chemical vapor deposition growth of graphene on Ni particles using solid carbon sources

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Rare Metals 2021年第8期40卷 2275-2280页

作者： Feng Zheng Ying Liu Cai-Li Zhang Jian Wang Nan Dong Pei-De Han Yan-Xia wu yu-cheng wu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Institute of New Carbon Materials Taiyuan University of TechnologyTaiyuan030024China

Graphene has attained a considerable amount of popularity as an attractive ultra-thin reinforcement for nickel(Ni)matrix composites in recent ***,its excellent reinforcement efficiency is suffered from the agglomeration of graphene nanosheets in manufacturing process and the poor bonding strength of graphene with Ni *** overcome these two problems,one of the efficient strategies is to in-situ grow graphene reinforcements on Ni particles for powder *** work aims to synthesize uniform graphene@Ni composite particles by using polymethyl methacrylate(PMMA)as the solid sources for chemical vapor deposition(CVD)*** results demonstrate that few-layer or multilayer graphene with different morphologies can be grown on the particles by controlling the PMMA content and annealed temperature,*** optimum condition for the formation of high-quality few-layer graphene is 1.0 mg·ml^(-1) PMMA and 900℃.A competition mechanism rises from the growth kinetic,and the spatial confinement effect has led to the formation of graphene with different microstructures and morphologies.

关键词： Graphene Ni particles Solid carbon sources Growth mechanism

Tailoring strength and ductility of high-entropy CrMnFeCoNi alloy by adding Al

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Rare Metals 2022年第3期41卷 1015-1021页

作者： Xin Xian Zhi-Hong Zhong Li-Jing Lin Zhi-Xiong Zhu Chang Chen yu-cheng wu School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

High-entropy alloys with high strength and acceptable ductility at both room and elevated temperatures for high-temperature structural applications are desired. In this paper, CrMnFeCoNi alloy with outstanding ductility but low strength was selected as baseline alloy to study the formation of hard phase to strengthen this ductile alloy by adding Al into it. The results indicate that there is a phase structure transition from fcc to bcc when adding enough Al into CrMnFeCoNi. The yield strength and hardness increase with the content of Al increasing, due to the formation of hard bcc phase in the ductile CrMnFeCoNi *** CrMnFeCoNiAl alloy with a bcc structure shows a high yield strength and adequate ductility at elevated temperatures. At 400 and 500℃, the yield strength and ductility of CrMnFeCoNiAl alloy are 975.59 MPa and6.39%and 989.48 MPa and 9.15%, respectively. An example of tailoring the strength and ductility of high-entropy alloy is demonstrated in this paper.

关键词： High-entropy alloys Structure transition Strength Ductility

Train probe for beam diagnostics of the SC200 superconducting cyclotron

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Nuclear Science and Techniques 2020年第10期31卷 95-104页

作者： Le-Xing Hu Kai-Zhong Ding yun-Tao Song yu-cheng wu Kai Yao Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Hefei CAS Ion Medical and Technical Devices Co. LtdHefei 230088China

The SC200 proton therapy system commissioned by the Hefei CAS Ion Medical and Technical Devices Co.,Ltd.(HFCIM;Hefei,China)and the Joint Institute for Nuclear Research(JINR;Dubna,Russia)has made significant progress.A main radial beam diagnostic system(MRBDS)equipped with a new type of train probe was developed to satisfy the requirements of beam *** this paper,the detailed design of the mechanical structure and electronics system of the MRBDS is *** electronics system,which includes hardware and software components,was tested and *** results show that measurement errors can be significantly reduced by the designed calibration *** repeatability of the mechanical structure was also verified,and the experimental results indicate that the unidirectional repeatability of the positioning is better than 0.3 ***,the MRBDS was used to measure the phase lag of the particles in the beam,and the results showed a high degree of agreement with theoretical calculations,which proved the applicability and high efficiency of the MRBDS.

关键词： Train probe Beam diagnostic Cyclotron Measurement and calibration Commissioning

Chloride Assisted Growth of Aluminum Nitride Nanobelts and Their Enhanced Dielectric Responses

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Chinese Journal of Chemical Physics 2008年第6期21卷 586-590页

作者： Ting Xie Min ye Zhi Jiang Yong Qin yu-cheng wu Guo-wen Meng Li-de Zhang Institute of Tribology Hefei University of Technology Hefei 230009 China Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

Aluminum nitride （AlN） nanobelts were successfully synthesized in high yield through a chloride assisted vapor-solid process. X-ray diffraction, transmission electron microscopy, and selected area electronic diffraction demonstrate that the as-prepared nanobelts are pure, structurally uniform and single crystalline, and can be indexed to hexagonal wurtzite structure. The micro observations show that there exist no defects in the obtained nanobelts. The growth direction of the nanobelts is along [0001]. The frequency spectra of the relative dielectric constant and of the dielectric loss were measured in the frequency range of 50 Hz to 5 MHz. Analysis of these spectra indicates that the interface in samples has great influence on the dielectric behavior of samples. As compared with AlN micropowders, AlN nanobelts have much higher relative dielectric constant, especially at low frequencies at room temperature.

关键词： Aluminum nitride Nanobelt Chloride assisted growth Dielectric property

Entropy versus enthalpy in hexagonal-close-packed highentropy alloys

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Rare Metals 2022年第8期41卷 2906-2920页

作者： Xin-Wei Yang Xiao-Hui Shi Hui-Jun Yang Jun-Wei Qiao Peter KLiaw yu-cheng wu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China School of Materials Science and Engineering University of TennesseeKnoxville37996USA School of Materials Science and Engineering Hefei University of TechnologyHefei230000China

The addition of hexagonal-close-packed(hcp)non-rare-earth elements Zr,Ti and Co,to the 10-component hep rare-earth-based high-entropy alloys(HEAs)with a composition of ScYLaNdGdTbDyHoErLuX(X=Zr,Co and Ti)was *** enthalpy of mixing between elements was found to have a significant effect on the formation of *** addition of Co combines with elements that had a strong chemical affinity to form intermetallic compounds by the effect of *** was added with all elements with poor chemical affinity and exhibited rejection to form a phase *** were the two terminal manifestations of the role of enthalpy over *** of Zr was soluble in the matrix under the action of entropy,while the other part had a greater affinity for Sc than the other elements to form a precipitate under the action of *** was the result of the local balance between the effect of enthalpy and *** solid solution of the elements had different degrees of strengthening effect,among which Zr had the most excellent strengthening effect from 185 to 355 MPa,so the solid solution strengthening model and precipitation strengthening model were proposed to predict the strength of the alloy with the addition of Zr effectively.

关键词： High-entropy alloys Hexagonal close-packed(hcp) Phase formation rule Configuration entropy Mechanical properties

Structure and tribological properties of Si/a-C:H(Ag)multilayer film in stimulated body fluid

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Chinese Physics B 2020年第11期29卷 412-419页

作者： Yan-Xia wu yun-Lin Liu Ying Liu Bing Zhou Hong-Jun Hei Yong Ma Sheng-Wang yu yu-cheng wu Institute of New Carbon Materials Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials(Taiyuan University of Technology) Ministry of EducationTaiyuan 030024China

Si/a-C:H(Ag)multilayer films with different modulation periods are prepared to test their potential applications in human *** composition,microstructure,mechanical and tribological properties in the simulated body fluid are *** results show the concentration of Ag first decreases and then increases with the modulation period decreasing from 984 nm to 250 *** the C content has an opposite variation ***,the concentration of Ag plays a more important role than the modulation period in the properties of the multilayer *** a-C:H sublayer of the film with an appropriate Ag concentration(8.97 at.%)(modulation period of 512 nm)maintains the highest sp3/sp2 ratio,surface roughness and hardness,and excellent tribological property in the stimulated body *** appropriate number of Ag atoms and size of Ag atom allow the Ag atoms to easily enter into the contact interface for load bearing and *** work proves that the Ag nanoparticles in the a-C:H sublayer plays a more important role in the tribological properties of the composite-multilayer film in stimulated body fluid condition.

关键词： Si/a-C:H(Ag)multilayer film modulation periods Ag concentration tribological properties

Anti-oxidation characteristics of Cr-coating on surface of Ti-45Al-8.5Nb alloy by plasma surface metallurgy technique

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Chinese Physics B 2020年第12期29卷 386-395页

作者： Bing Zhou Ya-Rong Wang Ke Zheng Yong Ma Yong-Sheng Wang Sheng-Wang yu yu-cheng wu Institute of New Carbon Materials Taiyuan University of TechnologyTaiyuan 030024China

TiAl-based alloys have received extensive attention recently due to their excellent properties. However, the weak oxidation resistance at temperatures higher than 800℃ can limit their further high-temperature structural *** improve the oxidation resistance of a high-Nb-content γ-TiAl alloy(Ti-45 Al-8.5 Nb, in units of at.%), a chromium(Cr)coating is prepared by using the plasma surface alloying technique, separately, at 800℃ and 1000℃. The x-ray diffraction(XRD) patterns reveal that an oxide surface layer consisting of Cr2O3, Al2O3, and TiO2 is produced on the Cr-coated Nb containing γ-TiAl substrates during the initial oxidation. However, the Cr2O3 is dominated in the oxide surface layer after being isothermally oxidized for 300 h. The oxidation kinetic curves are composed of a parabolic law stage(≤ 90 h) and a biquadratic law stage(≥ 90 h), fit by weight–gain curves. Due to diffusion in the fabrication process and oxidation process,the Cr-coated specimens have an adhesion force after being isothermally oxidized, specifically 69 N for a specimen after oxidation for 300 h. These results demonstrate that the Cr coating enhances the oxidation resistance and adhesion of a Ti-45 Al-8.5 Nb alloy, which may provide a new feasible scheme for designing oxidation protection layers.

关键词： titanium aluminum alloy coating isothermal oxidation plasma surface alloying technique