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Journal of materials Science & Technology 2022年第24期119卷 209-218页

作者： Hui Wen Ziyu Yi Zhenyu Hu Rui Guo Xuanwen Liu school of materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China

Zeolite Imidazole Framework(ZIF)has the advantages of large specific surface area,high porosity,and easy functionalization,so it looked like one of the most promising energy storage and conversion materials.In the meantime,transition metal oxides and sulfides have been widely used in environmental and energy conversion applications.Hence,a NaOH-assisted thioacetamide etching strategy is,therefore,designed with the metal-organic framework as precursor to realize the hollow nanostructure of ZIF bimetallic sulfide(Sx-CoCd-350)with abundant sulfur vacancies for enhanced catalysts oxygen evolution reaction(OER)/hydrogen evolution reaction(HER)performance and capacitance performance of capacitor.The overpotential of S_(2)-CoCd-350 in the OER process is 355 m V at 50 m A cm^(-2),which is substantially lower than other reported ZIF-based catalysts.S_(2)-CoCd-350 has an overpotential of 84 m V at 10 m A cm^(-2)when employed as HER catalyst.Furthermore,the S_(2)-CoCd-350 electrode did not alter appreciably during a long-term durability test of more than 10 h.More impressively,S_(2)-Co Cd-350 matches the activated carbon(AC)electrode with excellent capacitance performance 1220μWh cm^(-2)energy density(at 3370μW cm^(-2))and 25,000μW cm^(-2)(at 700μWh cm^(-2))maximum power density.In addition,the assembled supercapacitor has excellent cycling stability.

关键词： Electrocatalyst OER/HER Supercapacitor Sulfur vacancies Hollow nanostructure

Scalable synthesis and electrochemical performance of mesoporous graphene from calcium carbonate by magnesiothermic reaction

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Progress in Natural Science:materials International 2022年第3期32卷 289-295页

作者： Tianli Han Benshuang Sun Qingkui Li Chengduo Wang school of materials Science and Engineering (Henan Province Industrial Technology Research Institute of resources and materials) Zhengzhou University

A novel scalable synthetic method of mesoporous graphene has been developed using the compressed mixture of Mg and excess CaCO3in a closed container. The generated solid oxide and unreacted CaCO3could act as mesopore-forming agents, and the closed container could prevent the carbon dioxide from CaCO3flow away. As a result, the graphenes with a large number of 2–30 nm mesopores and high utilization ratio of Mg achieved. The graphenes had high specific surface area and excellent electrochemical performance. In particular, the Mg utilization ratio was up to 53.3% in the preparation of graphene using 2:1 CaCO3/Mg at 700℃, which is superior to previous researches. The obtained mesoporous graphene exhibited high specific surface area of 743.7 m2g-1, large specific capacitance of 140 F g-1, and high capacitance retention rate of 64.3%.

关键词： Mesoporous graphene Scalable synthesis Magnesiothermic reaction Calcium carbonate Electrochemical performance

Leaching of lead from zinc leach residue in acidic calcium chloride aqueous solution

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International Journal of Minerals,Metallurgy and materials 2015年第5期22卷 460-466页

作者： Le Wang Wen-ning Mu Hong-tao Shen Shao-ming Liu Yu-chun Zhai school of materials and Metallurgy Northeastern University School of Resources and Materials Northeastern University at Qinghuangdao

A process with potentially reduced environmental impacts and occupational hazards of lead-bearing zinc plant residue was studied to achieve a higher recovery of lead via a cost-effective and environmentally friendly process. This paper describes an optimization study on the leaching of lead from zinc leach residue using acidic calcium chloride aqueous solution. Six main process conditions, i.e., the solution pH value, stirring rate, concentration of CaC12 aqueous solution, liquid-to-solid （L/S） ratio, leaching temperature, and leaching time, were inves- tigated. The microstructure and components of the residue and tailing were characterized using scanning electron microscopy （SEM） and X-ray diffraction （XRD）. On the basis of experimental results, the optimum reaction conditions were determined to be a solution pH value of 1, a stirring rate of 500 r·min-1, a CaC12 aqueous solution concentration of 400 g·L-1, a liquid-to-solid mass ratio of 7：1, a leaching tempera- ture of 80℃, and a leaching time of 45 min. The leaching rate of lead under these conditions reached 93.79%, with an iron dissolution rate of 19.28%. Silica did not take part in the chemical reaction during the leaching process and was accumulated in the residue.

关键词： lead metallurgy hydrometaUurgy leach residue zinc calcium chloride leaching rate

High-entropy chemistry stabilizing spinel oxide(CoNiZnXMnLi)_(3)O_(4)(X=Fe,Cr)for high-performance anode of Li-ion batteries

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Rare Metals 2022年第4期41卷 1265-1275页

作者： Kang-Hui Tian Chan-Qin Duan Qun Ma Xing-Long Li Zhi-Yuan Wang Hong-Yu Sun Shao-Hua Luo Dan Wang Yan-Guo Liu school of materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Dielectric and Electrolyte Functional materials Qinhuangdao 066004China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China

High entropy oxides(HEOs),as a new type of single-phase multielement solid solution materials,have shown many attractive features and promising application prospect in the energy storage fleld.Herein,six-element HEOs(CoNiZnFeMnLi)_(3)O_(4) and(CoNiZnCrMnLi)_(3)O_(4) with spinel structure are successfully prepared by con-ventional solid-phase method and present outstanding lithium storage performances due to the synergy effect of various electrochemically active elements and the entropy stabilization.By contrast,(CoNiZnFeMnLi)_(3)O_(4) delivers higher initial discharge specific capacity of 1104.3 mAh·g^(−1),better cycle stability(84%capacity retention after 100 cycles at 100 mA·g^(−1)) and rate performance(293 mAh·g^(−1)at 2000 mA·g^(−1))in the half-cell.Moreover,the full-cell assembled with(CoNiZnFeMnLi)_(3)O_(4) and LiCoO_(2)provides a reversible specific capacity of 260.2 mAh·g^(−1)after 100 cycles at 500 mA·g^(−1).Ex situ X-ray diffraction reveals the electrochemical reaction mechanism of HEOs(CoNiZnFeMnLi)_(3)O_(4),and the amorphous phase and the large amount of oxygen vacancies were obtained after the initial discharge process,which are responsible for the excellent cycle and rate performance.This research puts forward fresh insights for the development of advanced energy storage materials for high-performance batteries.

关键词： High entropy oxides Spinel structure Anode Lithium-ion batteries

Influence of Sc Addition on Precipitation Behavior and Properties of Al-Cu-Mg Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 948-960页

作者： Xiangbin Han Shuangbao Wang Bo Wei Shuai Pan Guizhen Liao Weizhou Li Yuezhou Wei school of resources Environment and MaterialsGuangxi UniversityNanning 530004China Key Laboratory of LCR materials and Devices of Yunnan Province National Center for International Research On Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China

In this study, the Al-5.10Cu-0.65 Mg alloys without and with 0.2 wt% Sc addition were prepared to unveil the effect of Sc on the precipitate behavior and properties by atomic-scale scanning transmission electron microscopy. The results show that addition of Sc is able to significantly suppress the formation of the peak-hardening θ’ and S precipitates but in favor of stabilizing Guinier–Preston–Bagaryatsky(GPB) zones during isothermal aging at 180 ℃. The generation of unique GPB precursors dictating the evolution of the subsequent peak-hardening GPB zones is highly correlated with the insufficient vacancies and dragging effect of Sc to Cu in the Al-Cu-Mg-Sc alloy, thereby restricting the nucleation of θ′ and S precipitates owing to the decreased available Cu solutes. In property, 0.2 wt% Sc addition can not only enhance the corrosion resistance but also the electrical conductivity of the peak-hardening alloy. In addition, the peak-hardening Al-Cu-Mg-Sc alloy is also featured with increased strength without losing the ductility compared to its solid solution state. Further analyses indicate that the improved properties are essentially attributed to the formation of densely distributed strain-free GPB zones and smaller precipitate-free zones. The obtained results could provide a potential design strategy of high-performance alloys by Sc addition.

关键词： Al alloy Micro-alloying Precipitation Atomistic mechanism Transmission electron microscopy

Shape Control,Crystalline Conversion and Pseudocapacitance Properties of Mn3O4:Effects of Yb3+Doping

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Chinese Journal of Structural Chemistry 2018年第9期37卷 1440-1445页

作者：尤俊华郭耀祖赵耀倪志远郭瑞 school of materials Science and Engineering Shenyang University of Technology school of materials Science and Engineering Northeastern University School of Resources and Materials Northeastern University at Qinhuangdao

We report a facile method for the synthesis of manganese oxide（Mn3O4） nanorods via the direct reaction of MnCl2 and H2 O2 by doping Yb3＋ ions at room temperature and air atmosphere. The Mn3O4：Yb3＋ samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, cyclic voltammetry（CVs）, electrochemical impedance spectroscopy（EIS）, and charging-discharging test（CD）. The results show that trace Yb3＋ doping（6 at%） could effectively induce crystalline transformation of Mn3O4 from cubic system（space group Fd-3 m） to tetragonal system（space group I41/amd） and incite the morphology changing from irregular particles to uniform nanorods. When Yb3＋ doping amount is 3%, the capacitance of Mn3O4 reaches the maximum, 246 F/g, which is related to the morphology change and the corresponding decrease of impedance.

关键词： Mn3O4 Yb^3＋ shape control crystalline conversion pseudocapacitor

Preparation of ultrafine silica from potash feldspar using sodium carbonate roasting technology

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International Journal of Minerals,Metallurgy and materials 2016年第8期23卷 966-975页

作者： Jia-nan Liu Xiao-yi Shen Yan Wu Jun Zhang Yu-chun Zhai school of Metallurgy Northeastern University School of Resources and Materials Northeastern University at Qinhuangdao

A novel process was developed for the preparation of ultrafine silica from potash feldspar. In the first step, potash feldspar was roasted with Na_2CO_3 and was followed by leaching using Na OH solution to increase the levels of potassium, sodium, and aluminum in the solid residue. The leaching solution was then carbonated to yield ultrafine silica. The optimized reaction conditions in the roasting process were as follows： an Na_2CO_3-to-potash feldspar molar ratio of 1.1, a reaction temperature of 875°C, and a reaction time of 1.5 h. Under these conditions, the extraction rate of SiO_2 was 98.13%. The optimized carbonation conditions included a final solution p H value of 9.0, a temperature of 40°C, a CO_2 flow rate of 6 m L/min, a stirring intensity of 600 r/min, and an ethanol-to-water volume ratio of 1：9. The precipitation rate and granularity of the SiO_2 particles were 99.63% and 200 nm, respectively. We confirmed the quality of the obtained ultrafine silica by comparing the recorded indexes with those specified in Chinese National Standard GB 25576―2010.

关键词： potash feldspar sodium carbonate roasting silica optimization

Microstructure, mechanical properties and magnetic properties of FeCoNiCuTiSi_x high-entropy alloys

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Science China(Technological Sciences) 2020年第3期63卷 459-466页

作者： QU HuaiZhi GONG MingLong LIU FengFang GAO BingYu BAI Jing GAO QiuZhi LI Song school of materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China

The microstructure, mechanical properties and magnetic properties of FeCoNiCuTiSi_x(x=0, 0.05, 0.1, 0.2, 0.4 and 0.5) highentropy alloys were studied in detail in the present paper. The crystal structure changes from FCC+Laves to FCC+BCC+Laves phases, as the Si content increases. Cu is more segregated with the increase in Si content, which can be explained from a thermodynamic point of view. The FeCoNiCuTi high-entropy alloy has good compression mechanical properties, and the fracture strength, fracture strain, and Vickers hardness are 1584.2 MPa, 3.3% and 483.2 HV, respectively. However, the plasticity of the alloy decreases slightly as the Si content increases. The highest fracture strength obtained in this study is 1841.7 MPa at x=0.1.

关键词： high-entropy alloys microstructure properties mechanical properties magnetic properties

First-principles calculations of electronic and magnetic properties of CeN:The LDA +U method

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Chinese Physics B 2013年第10期22卷 460-462页

作者：郝爱民白静 School of Resources and Materials Northeastern University at Qinhuangdao

Electronic and magnetic properties of CeN are investigated using first-principles calculations based on density func- tional theory （DFT） with the LDA ＋ U method. Our results show that CeN is a half-metal. The majority-spin electron band structure has metallic intersections, whereas the minority-spin electron band structure has a semiconducting gap straddling the Fermi level. A small indirect energy gap occurs between X and W. The calculated magnetic moment is 0.99 μb per unit cell.

关键词： first-principles calculations strongly correlated system electronic structure magnetic properties

Electrolyte perspective on stabilizing LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)cathode for lithium-ion batteries

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稀有金属：英文版 2023年第2期42卷 387-398页

作者： Xiao-Feng Zhu Xiu Li Tian-Quan Liang Xin-Hua Liu Jian-Min Ma school of resources Environment and MaterialsGuangxi UniversityNanning530004China school of materials and Energy University of Electronic Science and Technology of ChinaChengdu611731China school of Transportation Science and Engineering Beihang UniversityBeijing102206China

Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is regarded as the promising cathode for lithium-ion batteries(LIBs).However,the challenges such as safety issues and poor cycling performance have seriously hindered its commercial applications.In order to overcome these difficulties,there has been extensive research and development of electrolyte modifications for high-energy-density LIBs with Ni-rich cathodes.Herein,this review introduces the research progress based on solvent additives,salt type additives and other electrolytes for LIBs with NCM811cathode materials and discusses how they control the interface stability.In particular,some recommendations for further modification of enhancing electrolyte stability and improving NCM811 electrochemical properties are summarized and proposed,which put forward new design rules for the screening and customizing ideal electrolyte additives for high performance NCM811 cathode-based LIBs.

关键词： Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) Interface Electrolyte additives Cathode electrolyte interphase(CEI) Electrolyte