检索结果-南通市图书馆

Journal of Rare Earths 2004年第z1期22卷 235-241页

作者： zhang yanghuan Dept. of Functional Mat. Res. Central Iron and Steel Res. Inst. Beijing 100081 China Sch. of Mat. Inner Mongolia Univ. of Sci. Baotou 014010 China

Low-Co AB5-type Mm(NiCoMnAl)5Bx(x=0, 0.1, 0.2) electrode alloys were prepared by casting and rapid quenching. The effects of the rapid quenching on the lattice constants, microstructures and electrochemical characteristics of the alloys were investigated in detail. The obtained results show that the rapid quenching made lattice constants and cell volume increased. In a range of the quenching rate, rapid quenching can increase the discharge capacities of the alloys. However, the discharge capacity of the as-quenched alloy is lower than that of the as-cast alloy when quenching rate is more than a critical value. The cycle lives of the alloys increase monotonously with the increase of the quenching rate.

关键词： AB5-type electrode alloy Electrochemical characteristics Low-Co Microstructure Rapid quenching

Single phase A2B7-type La-Mg-Ni alloy with improved electrochemical properties prepared by melt-spinning and annealing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2019年第12期37卷 1305-1311页

作者： Yiming Li Zhuocheng Liu Guofang zhang yanghuan zhang Huiping Ren Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and Technology

La-Mg-Ni alloys were prepared by melt-spinning with different cooling rates and followed by *** of the cooling rate leads to refinement of the grains size and increasing of the abundance of *** is favorable to formation of the A2 B7-type phase and promotes the discharge capacity,cycling stability and high rate discharge ability of the as-spun *** constitution of the annealed alloys is found to be closely related to the microstructure of the as-spun alloys.A single phase A2 B7-type microstructure is obtained in the annealed alloy which is attributed to the lower abundance of the LaNis of the original alloy spun with lower cooling *** of the single phase A2 B7-type microstructure is also ascribed to the isolated and homogeneous distribution of the morphology of the as-spun *** single phase alloy presents higher discharge capacity and better cycling stability compared with other annealed alloys.

关键词： La-Mg-Ni electrode alloys Melt-spinning Annealing Single phase microstructure Electrochemical properties Rare earths

The variation of microstructures,spectral characteristics and catalysis effects of Fe^3+ and Zn^2+ co-doped CeO2 solid solutions

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2020年第3期38卷 241-249页

作者： Guofang zhang Yiming Li Xin Zhao Jianyi Xu yanghuan zhang School of Material and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China

Fe^3+and Zn^2+ions were doped into the lattice of CeO2 via the hydrothermal *** micro structure and spectra features were analyzed *** results show that the solid solubility of Fe^3+and Zn^2+ions in Ce1-x(Fe0.5Zn0.5)xO2 can be identified as x=*** cell volumes are decreased by increasing the doped *** TEM graphs prove that the grain size of the sample is about 10 nm,and the EDS result indicates that the doped contents are in accordance with that of the theory ***,the doping also causes the increasing concentrations of the defects and oxygen vacancies which are supported by the XPS,Raman,UV and PL *** samples exhibit better catalytic activities for improving the hydrogen storage properties and the electrochemical kinetics of the ball milled Mg2Ni based ***,the catalysis effects are improved by increasing the doped contents,which can be ascribed to the increasing contents of the oxygen vacancies,defects,the special electron transition states and the nature of the doped ions in CeO2-based solid solutions.

关键词： Ce1-x(Fe0.5Zn0.5)xO2 solid solutions Hydrothermal method Hydrogen storage Catalysis Rare earths

Enhanced hydrogen storage performance of Mg-Cu-Ni system catalyzed by CeO2 additive

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2020年第9期38卷 983-993,I0003页

作者： Yi Yin Bo Li Zeming Yuan Yan Qi yanghuan zhang Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China

In this paper,the as-cast Mg85Cu5Ni10 alloy and Mg85Cu5Ni10-x wt%CeO2(x=0,4,8)alloys were prepared successfully by vacuum induction smelting and ball *** microstructure,hydrogen absorption/desorption kinetics and thermodynamics performances of the alloys were studied in *** results show that the Mg85Cu5Ni10 alloys with CeO2 additive have faster hydrogenation/dehydrogenation kinetics and better thermodynamic *** dehydrogenation activation energy is reduced to 81.211 kJ/mol from 119.142 by adding 8 wt%***2 contributes to producing structural defects,nanocrystallines,grain boundaries,partial amorphous,lattice dislocations and cracks which are favorable to provide more hydrogen diffusion channels during hydriding/dehydriding ***,CeO2 additive weakens the bond energy of *** micro structural changes caused by CeO2 additive improve the hydrogen storage performance of Mg85Cu5Ni10 markedly.

关键词： Mg-Cu-Ni alloy CeO2 additive Ball milling Dehydrogenation activation energy Thermodynamic property

Catalytic effect comparison of TiO_(2) and La_(2)O_(3) on hydrogen storage thermodynamics and kinetics of the as-milled La-Sm-Mg-Ni-based alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第6期9卷 2063-2077页

作者： yanghuan zhang Xin Wei Wei zhang Zeming Yuan Jinliang Gao Huiping Ren Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyNo.7 Aerding RoadKun DistrictBaotou 014010China Department of Functional Material Research Central Iron and Steel Research InstituteNo.76 Xueyuannan RoadHaidian DistrictBeijing 100081China Weishan Cisri-Rare Earth Materials Co. Ltd.Jining 277600China

In this investigation,mechanical grinding was applied to fabricating the Mg-based alloys La_(7)Sm_(3)Mg_(80)Ni_(10)+5 wt.%M(M=None,TiO_(2),La_(2)O_(3))(named La_(7)Sm_(3)Mg_(80)Ni_(10)-5 M(M=None,TiO_(2),La_(2)O_(3))).The result reveals that the structures of as-milled alloys consist of amorphous and *** particle sizes of the added M(M=TiO_(2),La_(2)O_(3))alloys obviously diminish in comparison with the M=None specimen,suggesting that the catalysts TiO_(2)and La_(2)O_(3)can enhance the grinding ***’s more,the additives TiO_(2)and La_(2)O_(3)observably improve the activation performance and reaction kinetics of the *** time required by releasing 3 wt.%hydrogen at553,573 and 593 K is 988,553 and 419 s for the M=None sample,and 578,352 and 286 s for the M=TiO_(2)composite,and 594,366,301 s for the La_(2)O_(3)containing alloy,*** absolute value of hydrogenation enthalpy change|△H|of the M(M=None,TiO_(2),La_(2)O_(3))alloys is 77.13,74.28 and 75.28 kJ/***,the addition of catalysts reduces the hydrogen desorption activation energy(E_(a)^(de)).

关键词： Mg-based alloy Ball milling Catalysts Hydrogen storage kinetics

Structure and electrochemical hydrogen storage behaviors of Mg-Ce-Ni-Al-based alloys prepared by mechanical milling

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2020年第10期38卷 1093-1102,I0003页

作者： yanghuan zhang Pengpeng Wang Wei zhang Wengang Bu Yan Qi Shihai Guo Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China

The influences of milling time and Ce content on the electrochemical property and micro structure of asmilled Mg1-xCexNi0.9Al0.1(x=0,0.02,0.04,0.06,0.08)+50 wt%Ni alloys were investigated *** as-milled alloys have an outstanding activation *** cycle stability conspicuously grows up with milling time and Ce proportion *** capacity retention rate at 100 th cycle of x=0.02 alloy augments from 47% to 63% when prolonging milling time from 5 to 30 h and it grows from55% to 82% for the 30 h milled alloy with Ce content growing from 0 to *** discharge capacity of x=0.02 alloy grows up invariably with milling time prolonging,while that of the 30 h milled alloys has the maximal value of 578.4 mAh/g with Ce content ***,the electrochemical kinetic properties of alloys significantly improve with milling duration extending,while they have the maximal values with Ce proportion varying.

关键词： Mg-based alloy Ce substituting Mg Mechanical milling Electrochemical property Rare earths

Structure and Electrochemical Hydrogen Storage Properties of as-Milled Mg-Ce-Ni-Al-Based Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 630-642页

作者： yanghuan zhang Zhenyang Li Wei zhang Wengang Bu Yan Qi Shihai Guo Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China Department of Functional Material Research Central Iron and Steel Research InstituteNo.76 Xueyuannan RoadHaidian DistrictBeijing 100081China

At room temperature,crystalline Mg-based alloys,including Mg2 Ni,MgNi,REMg12 and La2 Mg17,have been proved with weak electrochemical hydrogen storage *** improving their electrochemical property,the Mg is partially substituted by Ce in Mg-Ni-based alloys and the surface modification treatment is performed by mechanical coating *** milling is utilized to synthesize the amorphous and nanocrystalline Mg1-xCexNi0.9Al0.1(x=0,0.02,0.04,0.06,0.08)+50 wt%Ni hydrogen storage *** effects made by Ce substitution and mechanical milling on the electrochemical hydrogen storage property and structure have been *** shows that the as-milled alloys electrochemically absorb and desorb hydrogen well at room *** as-milled alloys,without any activation,can reach their maximal discharge capacities during first *** maximal value of the 30-h-milled alloy depending on Ce content is 578.4 mAh/g,while that of the x=0.08 alloy always grows when prolonging milling *** maximal discharge capacity augments from337.4 to 521.2 mAh/g when milling duration grows from 5 to 30 *** cycle stability grows with increasing Ce content and milling ***,the S100 value augments from 55 to 82%for the alloy milled for 30 h with Ce content rising from 0 to 0.08 and from 66 to 82%when milling the x=0.08 alloy mechanically from 5 to 30 *** alloys’electrochemical dynamics parameters were measured as well which have maximum values depending on Ce content and keep growing up with milling duration extending.

关键词： Mg-Ni-based alloy Ce substituting Mg Surface modification Mechanical milling Electrochemical performance

Electrochemical hydrogen storage characteristics of La_(0.75-x) M_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1)(M=Zr,Pr;x=0,0.1) alloys prepared by melt spinning

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2012年第5期31卷 -页

作者： zhang yanghuan YANG Tai CAI Ying HOU Zhonghui REN Huiping ZHAO Dongliang Key Laboratory of Integrated Exploitation of Baiyun Obo Mutti-Metal Resources Inner Mongolia University of Science and Technology Baotou 014010 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China

In order to ameliorate the electrochemical hydrogen storage performances of La-Mg–Ni system A_2B_7-type electrode alloys, the partial substitution of M (M = Zr, Pr) for La was performed. The melt spinning technology was used to fabricate the La_(0.75-x)M_xMg_0.25Ni_3.2Co_0.2Al_0.1 (M = Zr, Pr; x = 0, 0.1) electrode alloys. The influences of the melt spinning and substituting La with M (M = Zr, Pr) on the structures and the electrochemical hydrogen storage characteristics of the alloys were investigated. The analysis of XRD, SEM, and TEM reveals that the as-cast and spun alloys have a multiphase structure composed of two main phases (La, Mg)_2Ni_7 and LaNi_5 as well as a residual phase LaNi_2 . The as-spun (M = Pr) alloy displays an entire nanocrystalline structure, while an amorphous-like structure is detected in the as-spun (M = Zr) alloy, implying that the substitution of Zr for La facilitates the amorphous formation. The electrochemical measurements exhibit that the substitution of Pr for La clearly increases the discharge capacity of the alloys; however, the Zr substitution brings on an adverse impact. Meanwhile, the M (M = Zr, Pr) substitution significantly enhances its cycle stability. The melt spinning exerts an evident effect on the electrochemical performances of the alloys, whose discharge capacity and high rate discharge ability (HRD) first mount up and then fall with the growing spinning rate, whereas their cycle stabilities monotonously augment as the spinning rate increases.

关键词： A_2B_7-type electrode alloy element substitution melt spinning electrochemical performance

Electrochemical Performance of Nanocrystalline and Amorphous Mg–Nd–Ni–Cu-Based Mg_2Ni-type Alloy Electrodes Used in Ni-MH Batteries

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2014年第6期27卷 1088-1098页

作者： yanghuan zhang Haitao Wang Xiaoping Dong Wengang Bu Zeming Yuan Guofang zhang Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute College of Quality and Technical Supervision Hebei University

Nanocrystalline and amorphous Mg2Ni-type（Mg24Ni10Cu2）100–xNdx（x = 0, 5, 10, 15, 20） alloys were prepared by melt-spinning technology. The structures of as-cast and spun alloys were characterised by X-ray diffraction,scanning electron microscopy and transmission electron microscopy. Electrochemical performance of the alloy electrodes was measured using an automatic galvanostatic system. The electrochemical impedance spectra and Tafel polarisation curves of the alloy electrodes were plotted using an electrochemical work station. The hydrogen diffusion coefficients were calculated using the potential step method. Results indicate that all the as-cast alloys present a multiphase structure with Mg2 Ni type as the major phase with Mg6 Ni, Nd5Mg41 and Nd Ni as secondary phases. The secondary phases increased with the increasing Nd content. The as-spun Nd-free alloy exhibited nanocrystalline structure, whereas the as-spun Nd-doped alloys exhibited nanocrystalline and amorphous structures. These results suggest that adding Nd facilitates glass formation of Mg2Ni-type alloys. Melt spinning and Nd addition improved alloy electrochemical performance, which includes discharge potential characteristics, discharge capacity, electrochemical cycle stability and high-rate discharge ability.

关键词： Mg2Ni-type alloy Nd addition Melt spinning Structure Electrochemical performance

A comparison study of hydrogen storage properties of as-milled Sm_5Mg_(41) alloy catalyzed by CoS_2 and MoS_2 nano-particles

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第10期34卷 1851-1858页

作者： Zeming Yuan Bangwen zhang yanghuan zhang Shihai Guo Xiaoping Dong Dongliang Zhao InstrumentalAnalysis Center Inner Mongolia University of Science and Technology Baotou 014010 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Baotou 014010China Department of Mechanical Engineering Hebei University Baoding 071002 China

The influences of the catalysts of CoS2 and MoB2 nano-particles on microstructure and hydrogen stor-age behaviors of as-milled SmsMg41 alloy have been compared in this work. The SmsMg41 ＋ 5 wt.% M （M = COS2, MoS2） alloys were prepared by milling the mechanical ground as-cast SmsMg41 alloy powders （particle size ≤75 μm） with 5 wt.% CoS2 or MoS2 nano-particles （particle size ≤ 30 nm）, respectively. The results demonstrate that the CoS2 and MoS2 nanoparticles are embedded into the alloy surface, which is nanostructure containing some crystal defects, such as dislocation, grain boundary and twin etc. Those microstructures play a beneficial role in reducing the total potential barrier that the hydrogen absorption or desorption reactions must overcome, hence improving the hydrogen storage kinetics of the alloys. The as-milled alloys are composed of SmsMg41 and SmMg3 phases, and ball milling refines their crys-tal grains. The MgH2 and Sm3H7 phases appear after hydrogenation, while Mg and Sm3H7 phases exist after dehydrogenation. The dehydriding activation energy of M = CoS2 and MoS2 alloys are 101.67 and 68.25 kJ/mol H2 respectively. The initial hydrogen desorption of M = CoS2 and MoS2 alloys are 252.9 ℃ and 247.8 ℃.The hydrogenation and dehydrogenation enthalpy changes of M = MoS2 alloy are a little smaller than that of MzCoS2 alloy. Therefore, the catalyst MoS2 can improve the as-milled SmsMg41 alloy in hydrogen storage property more effectively than C0S2.

关键词： SmsMg41 alloy CoS2 and MoS2 catalyst Milling Activation energy Hydrogen storage kinetics