检索结果-南通市图书馆

Progress in preparation of rare earth metals and alloys by electrodeposition in molten salts

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2016年第11期35卷 811-825页

作者： Wei Han Mei Li mi-lin zhang Yong-De Yan Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University

Rare earth（RE） metals and their alloys have attracted considerable practical interests due to their functional properties. Because of their negative deposition potentials, RE metals cannot be electrochemically deposited from aqueous media. Using molten salt as medium provides a unique opportunity for the electrowinning and electrorefining of high-purity RE metals, as well as for the electrochemical formation of their alloys and intermetallic compounds. Certainly, the electrochemical behaviors of RE metals and their alloys have been investigated in a number of different molten salts comprising all-fiuorides,all-chlorides and mixed chloride-fiuoride media. Based on the results, RE and their alloys were produced by molten salt electrolysis. In this paper, the developments of preparation of RE metals and their alloys by electrolysis in molten salts in recent years were systematically summarized on both the local and international levels. Attention was paid mainly to the electrodeposition of RE metals and their alloys, including RE-Mg, RE-Al, RE-Ni, RE-Co,RE-Cu, RE-Fe and RE-Zn alloys.

关键词： Electrochemical formation Molten salts Electrolysis Rare earth Alloys

Preparation and characterization of LiAl_xMn_(2-x)O_4 for a supercapacitor in aqueous electrolyte

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,Metallurgy and Materials 2009年第1期16卷 112-118页

作者： Yun Xue Ye Chen mi-lin zhang Yong-de Yan College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

LiAlxMn2-xO4 （0≤x≤0.5） was synthesized by high temperature solid-state reaction. The structure and morphology of LiAlxMn2-xO4 were investigated by X-ray diffraction and scanning electron microscopy （SEM）. The results indicate that all samples show spinel phase. The polyhedral particles turn to club-shaped, then change to small spherical, and finally become agglomerates with increasing Al content. The supercapacitive performances of LiAlxMn2-xO4 were studied by means of galvanostatic charge-discharge, cyclic voltammetry, and alternating current （AC） impedance in 2 mol·L^-1 （NH4）2SO4 aqueous solution. The results show that LiAlxMn2-xO4 represents rectangular shape performance in the potential range of 0-1 V. The capacity and cycle performance can be improved by doping Al. The composition of x=0.1 has the maximum special capacitance of 160 F·g^-1, which is 1.37 times that of LiMn2O4 electrode. The capacitance loss of LiAlxMn2-xO4 with x=0.1 is only about 14% after 100 cycles.

关键词： supercapacitor electrode materials aqueous electrolyte spinel

Electrochemical co-reduction of holmium and magnesium ions in eutectic LiCl-KCl salts

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第4期41卷 1394-1402页

作者： Ji Wang Mei Li Wei Han Zhi-Yixiong Liu Xiao-Guang Yang Yang Sun mi-lin zhang Key Laboratory of Superlight Materials and Surface Technology College of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Institute of Nuclear Energy and Safety Harbin Engineering UniversityHarbin 150001China

The electrochemical co-reduction of Ho(Ⅲ)and Mg(Ⅱ)ions was investigated on Mo electrode in eutectic LiCl–KCl salts at temperature of 773 K using various electrochemical *** voltammogram(CV)and square wave voltammogram exhibit three reduction peaks corresponding to the reduction of Ho(Ⅲ)on pre-deposited Mg electrode,whose potentials are more positive than that of Ho on Mo electrode because of the formation of Mg-Ho intermetallic compounds by co-reduction of Ho(Ⅲ)and Mg(Ⅱ)***,chronopotentiometry and open-circuit chronopotentiometry were used to explore the electrochemical formation of Mg–Ho ***–Ho alloys were produced by galvanostatic electrolysis at the current of 1.5 A for different electrolysis ***_(5)Mg_(24),HoMg_(2) and HoMg intermetallic compounds were acquired and characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM)coupled with energy-dispersive spectroscopy(EDS).The results indicate that Mg–Ho intermetallic compounds,Ho_(5)Mg_(24),HoMg_(2) and HoMg,could be prepared by molten salts electrolysis.

关键词： Electrochemical formation Co-reduction MgHo alloys Galvanostatic electrolysis

Preparation of Mg-Li alloys by electrolysis in molten salt at low temperature

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第3期18卷 329-332页

作者： mi lin zhang Yong De Yan Zhi Yao Hou Lu An Fan Zeng Chen Ding Xiang Tang College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

A new technology for preparation of low cost Mg-Li alloys was studied. The alloys were prepared by electrolysis in molten LiCl-KCl （weight ratio is 1：1） electrolyte with Mg rod severing as the consumed cathode. Main factors that affect current efficiency were investigated, and optimal electrolysis parameters were obtained. Mg-Li alloys with low lithium Content （about 25%） were prepared by the unique method of a higher post-thermal treatment temperature after electrolysis at low temperature. The results showed that the electrolysis can be carried out at low temperature, which resulted in reducing preparation cost due to energy saving. The new technology for the oreoaration of Mg-Li alloy by electrolysis in molten salt was laroved to be feasible.

关键词： Mg-Li alloys Molten salt electrolysis Low temperature Current efficiency

Recovery and separation of rare earth elements by molten salt electrolysis

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,Metallurgy and Materials 2021年第6期28卷 899-914页

作者： Tai-qi Yin Yun Xue Yong-de Yan Zhen-chao Ma Fu-qiu Ma mi-lin zhang Gui-ling Wang min Qiu Yantai Research Institute&Graduate School Harbin Engineering UniversityYantai 264006China College of Science Heihe UniversityHeihe 164300China Zhongkexin Engineering Consulting(Beijing)Co. LtdBeijing 100039China

With the increasing demand of rare earth metals in functional materials,recovery of rare earth elements(REEs)from secondary resources has become important for the green economy *** salt electrolysis has the advantages of low water consumption and low hazardous waste during REE *** review systematically summarizes the separation and electroextraction of REEs on various reactive electrodes in different molten *** also highlights the relationship between the formed alloy phases and electrodeposition parameters,including applied potential,current,and ion ***,the feasibility of using LiF–NaF–KF electrolyte to recover REEs is evaluated through thermodynamic *** related to REE separation/recovery the choice of electrolyte are discussed in detail to realize the low-energy and high current efficiency of practical applications.

关键词： rare earth element molten salt reactive electrode electrochemical separation

Molten salt synthesis and supercapacitor properties of oxygen-vacancy LaMnO3-δ

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第4期29卷 173-181页

作者： Ya-Li Song Zi-Chang Wang Yong-De Yan mi-lin zhang Gui-ling Wang Tai-Qi Yin Yun Xue Fan Gao min Qiu Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbinEngineering UniversityHarbin 150001HeilongjiangChina College of Science Heihe UniversityHeihe 164300HeilongjiangChina

Due to the unique structure of perovskite materials,their capacitance can be improved by introducing oxygen *** this paper,the LaMnO3-δ material containing oxygen vacancy was synthesized by molten salt method in KNO3-NaNO3-NaNO2 *** La-Mn-O crystal grows gradually in molten salt with the increase of *** was confirmed that LaMnO3-δ with perovskite structure and incomplete oxygen content were synthesized by molten salt method and presented a three-dimensional ***3-δ stores energy by redox reaction and adsorption of OH-in electrolyte *** comparison with the stoichiometric LaMnO3 prepared by the sol-gel method,LaMnO3-δ prepared by molten salt method proffered higher capacitance and better *** galvanostatic charge-discharge curve showed specific capacitance of 973.5 F/g under current density of 1 A/g in 6 M *** capacitance of LaMn03-δ was 82.7%under condition of 5 A/g compared with the capacitance at the current of 1A/g,and the specific capacitances of 648.0 and 310.0 F/g were obtained after 2000 and 5000 cycles of galvanostatic charging-discharging,*** salt synthesis method is relatively simple and suitable for industrial scale,presenting a promising prospect in the synthesis of perovskite oxide materials.

关键词： LaMnO3-δ Perovskite oxide KNO3-NaNO3-NaNO2 melt Supercapacitor Molten salt synthesis

Electrochemical behavior and underpotential deposition of Sm on reactive electrodes(Al,Ni,Cu and Zn)in a LiCl-KCl melt

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,Metallurgy and Materials 2020年第12期27卷 1657-1665页

作者： Tai-qi Yin Lang Chen Yun Xue Yang-hai Zheng Xue-peng Wang Yong-de Yan mi-lin zhang Gui-ling Wang Fan Gao min Qiu College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China College of Science Heihe universityHeihe 164300China Geely Automobile Research Institute Ningbo 315336China

Sm extraction from a LiCl-KCl melt was carried out by forming alloys on various electrodes,including Al,Ni,Cu,and liquid Zn,and the electrochemical behaviors of the resultant metal products were investigated using different electrochemical *** Sm metal deposition via the conventional two-step reaction process was not noted on the inert electrode,underpotential deposition was observed on the reactive electrodes because of the latter's depolarization *** depolarization effects of the reactive electrodes on Sm showed the order Zn>Al>Ni>***-M(M=Al,Ni,Cu,Zn)alloys were deposited by galvanostatic and potentiostatic *** products were fully characterized by X-ray diffractometry(XRD)and scanning electron microscopy(SEM)-energy dispersive spectrometry(EDS),and the stability of the obtained M-rich compounds was ***,the relationship between the electrode potential and type of Sm-M intermetallic compounds formed was assessed on the basis of the observed electrochemical properties and electrodeposits.

关键词： electrodeposits depolarization effect reactive electrodes samarium alloys

Transfer RNA-derived small RNA serves as potential non-invasive diagnostic marker and a novel therapeutic target for acute pancreatitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第1期31卷 152-156页

作者： Jing zhang Chun-lin Ou Department of Immunology School of Basic MedicineCentral South UniversityChangsha 410000Hunan ProvinceChina Department of Pathology Xiangya HospitalCentral South UniversityChangsha 410008Hunan ProvinceChina

Transfer RNA(tRNA)-derived fragments,a new type of tRNA-derived small RNA(tsRNA),can be cleaved from tRNA by enzymes to regulate target gene expression at the transcriptional and translational *** are not only degradation fragments but also have biological functions,including those in immune inflammation,metabolic disorders,and cell *** dysregulation is closely associated with multiple diseases,including various cancers and acute pancreatitis(AP).AP is a common gastrointestinal disease,and its incidence increases *** development is associated with tsRNAs,which regulate cell injury and induce inflammation,especially pyroptosis and ***,serum tRF36 has the potential to serve as a non-invasive diagnostic biomarker and leads to pancreatic acinar cell ferroptosis causing inflammation to promote *** show the characteristics of tsRNAs and their diagnostic value and function in AP,and discuss the potential opportunities and challenges of using tsRNAs in clinical applications and research.

关键词： Transfer RNA derived small RNAs Acute pancreatitis Liquid biopsy Biomarker Cell pyroptosis Ferroptosis

Electrodeposition of quarternary Mg-Zn-Li-Ca alloys from molten salts

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

Transactions of Nonferrous Metals Society of China 2013年第3期23卷 861-865页

作者：曹鹏张密林韩伟颜永得陈丽军哈尔滨工程大学教育部超轻材料与表面技术重点实验室哈尔滨150001

Direct electrodeposition of quarternary Mg-Zn-Li-Ca alloys on a molybdenum electrode from LiCl-KCl-MgCl2-ZnCl2-CaCl2 melts at 943 K was *** voltammograms（CVs） show that the deposition potential of Li shifts in a positive direction after adding MgCl2,ZnCl2 and *** measurements indicate that the codepositon of Mg,Li,Zn,and Ca occurs at current densities lower than-1.55 A/cm2.X-ray diffraction（XRD） indicates that Mg-Zn-Li-Ca alloys with different phases were prepared via galvanostatic *** microstructures of typical phase of Mg-Zn-Li-Ca alloys were characterized by optical microscopy（OM） and scanning electron microscopy（SEM）.The analysis of energy dispersive spectrometry（EDS） shows that elements of Mg and Ca distribute homogeneously in the Mg-Zn-Li-Ca ***,element Zn mainly locates at the edges of the domain.

关键词： Mg-Zn-Li-Ca alloys electrolysis cyclic voltammetry molten salt