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Method for reducing magnesium-based hydride hydrogen-release temperature by utilizing solid-solution doping of transition metal

A magnesium-based hydride, transition metal technology, applied in the direction of transition element hydride, alkali metal/alkaline earth metal/beryllium/magnesium hydride, chemical instruments and methods, etc., can solve problems such as low solid solubility, and achieve the preparation process. Simple, low hydrogen release temperature, low price effect

Active Publication Date: 2015-03-04
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

In fact, during the ball milling process, some transition metal atoms are most likely solid-dissolved into the MgH 2 lattice, its solid solution will inevitably affect the MgH 2 However, in the experimental study, due to the transition metal in MgH 2 The solid solubility in the matrix is ​​low, and people often ignore its role

Method used

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  • Method for reducing magnesium-based hydride hydrogen-release temperature by utilizing solid-solution doping of transition metal
  • Method for reducing magnesium-based hydride hydrogen-release temperature by utilizing solid-solution doping of transition metal
  • Method for reducing magnesium-based hydride hydrogen-release temperature by utilizing solid-solution doping of transition metal

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Embodiment 1

[0029] The raw material is commercially available magnesium hydride powder (MgH 2 , purity 99.8wt.%), transition metal powder titanium (Ti, purity 99.9wt.%); the two are mixed evenly with a mass ratio of 9:1, and 3g of the mixed raw material is put into a ball mill tank, and the ball and the mixed raw material The ratio is 30:1, the ball milling time is 6 hours, and the ball milling speed is 120rpm. During the ball milling process, in order to prevent the temperature in the tank from being too high, stop for 5 minutes every 55 minutes of ball milling. MgH obtained after ball milling 2 -10wt.%Ti composite system has a particle size of several hundred nanometers, compared to pure MgH under the same ball milling conditions 2 system (see figure 1 (a)), the particle size is obviously fine and evenly distributed (see figure 1 (b)); The ball milled product is made of β-MgH 2 、TiH 1.97 , Mg, Ti multiphase composition (see figure 2 (b)); Calculate the β-MgH in the composit...

Embodiment 2

[0033] The raw material is commercially available magnesium hydride powder (MgH 2 , purity 99.8wt.%), transition metal powder nickel (Ni, purity 99.9wt.%); the two are mixed evenly with a mass ratio of 9:1, and 3g of mixed raw materials are put into a ball mill tank. Other process parameters and implementation Example 1 is the same. MgH obtained after ball milling 2 The particle size of -10wt.%Ni composite system has reached hundreds of nanometers (see figure 1 (c)); The ball milled product is made of β-MgH 2 , Mg, Ni multiphase composition (see figure 2 (c)); Calculate the β-MgH in the composite system by refining the XRD spectrum 2 The lattice constant (see Table 1), and pure MgH under the same ball milling conditions 2 Compared with the system, the β-MgH in the composite system 2 The lattice constant of the phase increases, indicating that some Ni atoms are solid-dissolved into β-MgH 2 In the matrix, resulting in its lattice expansion; DSC analysis results sho...

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Abstract

The invention belongs to the technical field of hydrogen storage, and especially relates to a method for reducing magnesium-based hydride hydrogen-release temperature by utilizing solid-solution doping of a transition metal. According to the method, a mechanical ball milling process is utilized for together ball milling of MgH2 and a less amount of a transition metal Ti or Ni, and a MgH2-Ti and MgH2-Ni hydrogen-storage composite system is finally obtained. The composite system prepared by using the method is granular, the granule dimension is in the level of several hundred nanometer, partial Ti or Ni atoms are dissolved in a MgH2 matrix in the form of a solid solution during ball milling, and thus the crystal lattice of the MgH2 matrix is deformed and the thermodynamic stability is reduced. Compared with a pure MgH2 system under same ball milling conditions, the initial hydrogen-release temperature of the ball-milling composite system is substantially reduced, the solid-solution doping of Ti and Ni causes the initial hydrogen-release temperature of the MgH2 matrix to respectively reduced by 61.14 DEG C and 135.84 DEG C, and the hydrogen-release performance of the magnesium-based hydride is effectively improved. The employed raw materials are easily obtained, and the material preparation method is maturely developed, also is convenient to operate and controllable in process, and is an effective method for reducing the hydrogen-release temperature of the magnesium-base hydride.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage, and in particular relates to a hydrogen storage material modification technology, in particular to a method for reducing the hydrogen release temperature of magnesium-based hydrides by solid-solution doping with transition metals. Background technique [0002] With the increasing energy crisis and environmental pollution, the development of clean and renewable energy has become the focus of global attention. Hydrogen energy has attracted much attention because of its clean and pollution-free, wide-ranging sources, and high energy density. Providing safe, efficient and economical hydrogen storage technology is the key to the large-scale application of hydrogen energy. Among many hydrogen storage materials, magnesium-based hydrides (MgH 2 ) is considered as a metal hydride hydrogen storage material with great development potential due to its high hydrogen storage capacity (7.6wt%), light...

Claims

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Application Information

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IPC IPC(8): C01B6/02C01B6/04C01B3/04
CPCC01B3/0078C01B6/04C01P2002/72C01P2004/03C01P2004/62C01P2004/80Y02E60/32Y02E60/36
Inventor 张健孙立芹毛聪李妮
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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