Progress in the preparation of nano-hydrogen storage alloys ZHANG Hongbing, LI Dao-huo, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 23,31 Micron-sized alloys have attracted the attention of hydrogen storage alloy researchers, and the current The preparation method only focuses on the ball milling method. This article summarizes the preparation methods of nano-hydrogen storage alloy particles and composite materials, and reviews the preparation methods of potential nano-hydrogen storage alloys from the perspective of nanomaterial preparation techniques.

The classification number is 029+.1 Document identification code Hydrogen storage alloy is a kind of functional material capable of reversibly storing a large amount of hydrogen 1. At present, the large-scale production of metal hydride nickel battery 1 using a hydrogen storage alloy as a negative electrode has produced a huge amount of Economic and social benefits. However, as a hydrogen storage medium, its performance has yet to be improved. The current practical hydrogen storage alloy density is only 12 mass fractions, the same below, while the magnesium-based is still the capacity hydrogen storage alloy river 82 is 7.6, Heqiao 4 is 3.61. can only be used at 3,1 or more, and Its hydrogen absorption and desorption kinetic properties are also very practical. The presence of metal oxide hydroxide on the surface of most hydrogen-absorbing alloys hinders the decomposition of hydrogen at the feed surface and the expansion of hydrogen to the bulk phase, usually. When required, it is called a complex activation process under warming hydrogen pressure, which seriously affects the practical application of some hydrogen storage alloys.

Due to the quantum size effect, the small size effect and the agricultural blood effect, nanomaterials exhibit many unique chemical properties. Has become a front-line field of many disciplines such as physical and chemical materials research and development of hydrogen storage alloys after nanometerization. Many new thermodynamic properties, such as significantly improved activation performance 5 have a higher hydrogen diffusion coefficient 7 and excellent hydrogen absorption and desorption Dynamic properties 79. For example, at 200, the lower micrometer 2 alloy hardly absorbs hydrogen, while the nanocomposite nanofluid 82 particles can quickly absorb 2 hydrogen atoms. 8. The nano-hydrogen storage alloy may be a magnesium-based high-capacity storage The practical application of hydrogen alloys and the dramatic improvement of the overall performance of hydrogen storage alloys 2315, etc., have reviewed the effects of the phase structure constituents of nanometal hydrides on the thermodynamic and kinetic properties of hydrogen storage alloys. This article hopes to review and prospect the preparation of nano-hydrogen storage alloys.

There are many ways to prepare nanomaterials. and. The preparation method of nano-materials has a great influence on its performance. At present, the preparation methods of nano-hydrogen storage alloys mainly focus on the mechanical grinding alloying method, and the breadth and depth of other preparation methods need to be further developed. In this paper, we briefly describe the preparation methods of existing and potential storage alloy nanoparticles and nanocomposite storage alloy materials, and try to summarize the preparation methods of nano-hydrogen storage alloys. It is hoped that the development of hydrogen storage alloys at home and abroad will be paid attention to the interest in researching nano-hydrogen-mediated gold dismantling methods and their effects on hydrogen storage media properties. 1 Preparation of Hydrogen Storage Alloy Nanoparticles Storage, Preparation of Alloy Nanoparticles Hydrogen storage gold nanostructured mortar base. The ideal nanoparticle should meet the requirements of 1 small particle size 2 no agglomeration; 3 narrow particle size distribution; 4 shape close to the ball type; 5 material composition can be controlled. Any preparation method that satisfies the above requirements can be applied in nanopreparation. Here are some methods for preparing hydrogen storage alloy nanoparticles.

The principle is that in the protective gas or protective liquid, the micron-sized alloy powder or the elemental powder that forms the gold is written into the ball mill for a long period of time. The alloy powder is crushed into nano-particles or nanosized particles are introduced. This method has the advantages of simple equipment and high efficiency. The vapor pressure of magnesium in mountains is high. Therefore, magnesium-based alloy synthesis + suitable for melting method, and mechanical grinding alloying method is its ideal synthesis method, Zhejiang University; Lei Yongquan, who studied the ball mill method to produce non-products meaning alloy scenery is considered that it is There are potential electrode alloys; research papers on foreign-made reagents for exchange of gold and immortality; non-characteristic properties of alloy nanoparticles; hydrogen absorption characteristics have been introduced into the hall; other series of hydrogen storage alloy ball milling methods There are also many preparations.

Such as knowledge, respectively, from the elemental metal and the as-cast alloy prepared by Ding Ru and 7 out of the 5 cis 52 nano-particles 6.2 Shan Xin is divided into 1 stop, elbow 8, Qiao Mi particles. The gold nanoparticle is worth mentioning the foot, using deuterium iron. Nickel oxide powder was prepared by mechanical alloying under a hydrogen atmosphere to prepare 6-nano-nanoparticles. The alloying of this fractionation method was obviously promoted by the gasification of the stomach. Preparation of hydrogen storage nanoparticles could be considered in this method.

In the process of liquid phase synthesis of nanoparticles, it is possible to increase its stability by adding; to form a layer of protective layer on the surface of nanoparticles, so that nanoparticle 1 produces cocoon repulsion force, preventing the adhesion and aggregation of nanoparticles, unfortunately, this This method was not found in the research paper of the preparation of hydrogen storage alloy nanoparticles by liquid 1 protection ball milling method.

However, the ball milling method has the characteristics of high energy consumption and high energy consumption in villages and structural wringing.

1.2 Chemical Synthesis In recent years, there have been reports of the formation of various metals, compounds and deposits, and alloy nanodensives. This method has the characteristics of low cost, simple operation and large-scale industrialization. The main methods are 1 starting from the metal organic compounds, the synthesis of metal hydrides and hydrogen storage alloy nanoparticles 1 and so on with Ding 4 Xi and Fu as reagents. Magnesium 1 pick and take, magnesium, this won the 2 than the clothes up to 100200,85,1 or so. Although dilute can be directly reacted with magnesium, but in this synthesis, dilute and hydrogen, uranium are essential 18.81 Cas and other magnesium magnesium reacts at room temperature to generate magnesium and the latter decomposed into ultra-fine magnesium in vacuum. Powder 1371 In this method, magnesium is refined and lanthanum can be recycled. Dingya found that the obtained magnesium powder particles are uniformly hooked and have a regular shape with an average particle size of 6,1. Vacuum decomposition is the key to obtaining nanoparticles.

Preparation of gold hydride nanoparticles.

This kind of simple and practical method of incorporation, in the early 1980s, 3, Cambodia, such as the use of the use of 00; a redundant 1 benefits as a catalyst, under the pressure of 4070 from the industrial synthesis of the basic diameter of 501 River 822 which The oxime acts as a phase transfer agent to convert the lanthanum metal magnesium into oxime magnesium. After changing the catalyst concentration and various reaction parameters in the reaction system, yttrium and bond, etc., at room temperature 60, catalytically synthesize a 51-state nanoparticle with a basic diameter of 15 and progressively add soluble linear polyphenylene into the reaction solution. Ethylene to protect the primary metal hydride, inhibiting the microchemical 3 other chemical methods for synthesis of hydrogen storage alloy nanoparticles.

Such as the use of alkali metal reduction to obtain nano magnesium powder. The use of particles have an effect 34 in the vacuum is called high temperature molten magnesium vapor and solvent vapor rapid co-condensation is another method for the preparation of nano-magnesium 251.

1.3 The pulsed electrochemical deposition method tyrants tyrants and retrenches, and vigorously wins and screams Hao You. Correcting, retrieving, and immersing parameters are as follows. Temperature sinking density, so that the sinking process has a high rate of nucleation rate growth characteristics.

In order to obtain nanoparticles. This method has the characteristics of low cost, simple process control and suitable for large-scale production, and has also been used for large-scale production. This method is used to synthesize 1 and gold out of other hydrogen alloy nano-particle nano-scale films and nano-base bulks. = 1.4 Rapid Solidification Rapid Solidification is a commonly used method of refining metal particles in metal materials studies. One furnace and the other are under test or gas protection. The rapid solidification technology has become an important method for refinement of hydrogen storage alloys before the preparation of hydrogen storage alloy nanoparticles. Due to the limitations of cost and cooling rate, its application scope and prospects are not optimistic. 1.5 Gas Condensation Method This is a method of preparing nanoparticles using thousands of methods. Its original helium is in inert gas such as human. In active gases, 2,14, and 3, the metal alloy or compound is heated to vaporize and then condensed in a gaseous medium to form nano-sized particles, and the nano-base bulk material may also be pressed out in situ. The nanoparticles prepared by this method have uniform particle size distribution and less impurity content, and can prepare high melting point metals and their alloys.

However, this method of milling is too low cost and too high. This method was used to synthesize 2, about 1 scoop under hydrogen atmosphere and helium atmosphere. , Heart = 5085 nanometer particles, 61. This method is used to synthesize mutated nano-particles.

1.6 cluster beam deposition method 1; deposition of an alloy cluster generated by an ultrasonic cluster beam generator onto a specific substrate to prepare a nano-alloy thin film 3 Nano-hydrogen storage alloy thin film prepared by the method has composition and can precisely control the nano-particles The features such as less defects provide good conditions for the research and structural integrity of hydrogen storage alloy nanoparticles.

2 Preparation of Nanocomposite Hydrogen Storage Alloys Nanocomposite main source of hydrogen-exchanged gold. The characteristics of two kinds of primary flash 1 hydrogen storage alloys can be divided into surface characteristics and bulk properties. For example, the ability to decompose hydrogen is resistant, the ability to corrode is the surface property, and the hydrogen diffusion rate of oxygen storage is the bulk property. Only the alloy with the best performance of the bulk phase is the most perfect unalloy. Thus, there is a composite material that combines the advantages of the two alloys with excellent gastric performance and excellent physical properties of the bulk phase.

The formed palladium oxide is easily reduced to palladium in a hydrogen atmosphere and is an ideal hydrogen storage alloy and surface material. The storage, intercalation, and bread crumb layers, such as nanoscale 1st, etc., were added to the 1st order 82 ss. 3, 1 nanopowder with 1 nanometer, and the synergetic powders absorbed hydrogen very quickly even at room temperature.

2 Nanoparticles Due to their large specific surface area and high surface energy, coupled with the agglomeration phenomenon in nanopowder, they can be directly used to prepare bulk materials for nano-particles. The compacted density of the bulk is low. 5 The contact performance between particles is not it is good. Can not give full play to the advantages of nano-materials. The nano-particles and micron-sized sub-micron powders are mixed to obtain the nano-composite materials or gradient village materials, and the performance can fully exert the superiority of the nano-materials performance, and can also reduce the cost of the materials. It is a pity that this kind of nanocomposite material is prepared. To date, we have not yet discovered nanocomposites. The prospects for and prospects for Alloy 3 The hydrogen storage alloy particles and the compound must be used as the basis for the preparation of nanometer alloys. In addition to the mechanical grinding and alloying method, most of the hydrogen storage alloy research workers attach great importance to it. Other preparation methods mostly occur in the field of nanometer preparation. The hydrogen storage performance of the prepared nano hydrogen storage alloy is very limited, as long as the nanoscale storage is enhanced. The Preparation Method of Hydrogen Alloy Village Material and Its Energy Performance Research. It is entirely possible to explore the new whisker fields for hydrogen alloy research and continue to expand its applications. Chemical and electrochemical methods for preparing nano-hydrogen alloys have advantages of low cost, simple operation, easy mass production, easy control of components, etc. The characteristics are worthy of enhanced application research. The methods of gas-phase condensation and cluster deposition are to study the properties of nano-hydrogen storage alloys. Effective reference paragraph 1 Jizhe Yuelin 2q Liao Shijian, Zhang Shuangqing, Yu Shuwen. Active magnesium and active magnesium hydride together 22 Liao Shijian, Zhang Shuangqing. The Hydrogenation Performance of Magnesium Hydride Synthesized by Gallium Magnesium Vacuum Pyrolysis, Journal of Chemical Journal, 1992, 850.

26 Shen Wenwen, Wang Genshi, Zhang Yunshi, et al. Research on the Synthesis and Hydrogen Absorption Properties of 3 State Hydrogen Storage Compounds, 35. Chemical Journal of Chinese Universities, 1980 2 Shen Yuwen, Zhou Zuoxiang, Wang Genshi, et al. The new trend of inorganic synthetic chemistry inorganic solid chemistry. RE, 198,17.

28 Lu Shuqin, Wu Duoen, Shen Yuwen, et al. Chemical synthesis and properties of Yuan alloy 1314. Chinese Journal of Rare Earths, 1988, 6 2 Shen Weiwen, Wang Genshi, Zhou Zuoxiang, et al. Chemical synthesis of titanium-nickel intermetallic compound and its role in hydrogen storage at the cathode. Chemical Journal of Colleges and Universities, 1983, 3q Shen Xiaowen, Wang Genshi, Song Deqi, et al. Preparation of FeTi from Ilmenite Powder and Study on Its Hydrogen Absorption Properties . Chemical Journal of Chinese Universities, 1983 31 Shen Yuwen, Zhang Yunshi, Yuan Huatang. The new synthetic method for hydrogen storage materials was studied by the displacement and diffusion method. College chemistry 32 Shen Yuwen, Zhang Yunshi, Chen Shengchang, et al. A new method for the synthesis of lithium aluminum hydride. Chemical Journal of Chinese Universities, 19823197.

35 weeks, Lei Yongquan, et al. Gas atomization of hydrogen storage alloys, 1 1 1 丁; 5 activation properties. Is a journal. 1996.8857, Information Window China International Powder and Bulk Material Industry Technology and Equipment Exhibition March 21, 2001 23rd Shanghai Everbright Convention & Exhibition Center Caobao Road No. 78 Organizer China Mining Association Undertaker Shanghai New Presence Exhibition Service Co., Ltd. Supporting Unit National Chemical Powder Engineering Design Center Station Exhibitor Scope 8,6, Chong, 1. Mining Metallurgical Abrasive Silicate Coal Pharmaceutical Chemicals and Food Industry Powder Manufacturing and Processing Solid Bulk Material Handling and Environmental Protection Equipment, Including Crushing and Screening Classification Solid-liquid separation, mixing and kneading, selection of materials, coating, drying, feeding, forming, sintering, gold dust collection, conveying, environmental protection, and other equipment. Tear, 1 to take, grinding 2 factory automation testing and laboratory equipment testing control equipment laboratory equipment automatic control energy-saving system auxiliary design and processing systems. Condition toiy 3. Engineering materials powder wide products, including wear-resistant materials, filter materials, screen surface, new materials, functional powders and various powder new products. 1 咕 士 士 士 士 13 161 161 161 13161 powdered address Shanghai Pudong Avenue 2123, Longzhu Square 50 Postal code 200135

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