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Reversible hydrogen storage material and preparation method thereof

A technology of hydrogen storage material and deposition method, which is applied in the direction of metal material coating process, hydrogen production, ion implantation plating, etc., can solve the problem of high temperature and pressure of hydrogenation/dehydrogenation, poor reversibility of complex hydrides, kinetics, etc. Poor performance and other problems, to achieve the effect of low initial dehydrogenation temperature, good thermal stability, and fast dehydrogenation rate

Inactive Publication Date: 2015-03-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coordination hydrides obtained by these methods have problems such as poor reversibility, high addition / dehydrogenation temperature and pressure, poor kinetic properties, and poor thermal stability, especially at high addition / dehydrogenation temperatures. The problem of thermal decomposition

Method used

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  • Reversible hydrogen storage material and preparation method thereof
  • Reversible hydrogen storage material and preparation method thereof
  • Reversible hydrogen storage material and preparation method thereof

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preparation example Construction

[0016] A method for preparing a reversible hydrogen storage material, specifically comprising the following steps:

[0017] (1) Metal magnesium, zinc, and boron were co-deposited on silicon wafers in a hydrogen environment by physical vapor deposition, and the vacuum degree was 5.2x10 -4 Pa, a deposition rate of 2.5 nm / min yields metal borohydrides, Mg x Zn 1-x (BH 4 ) 2 , where x=0.05~0.95;

[0018] (2) Deposit metal palladium (Pd), platinum (Pt) or cobalt (Co) on the surface of the above-mentioned metal borohydride in a hydrogen-free vacuum environment by vacuum sputtering, and the vacuum degree is 1×10 -8 Pa, the deposition rate is 1.5nm / min, and the deposition thickness is 2-20nm to obtain a reversible hydrogen storage material, Mg x Zn 1-x (BH 4 ) 2 -M, where x=0.05-0.95, and M is one of Pd, Pt and Co.

Embodiment 1

[0020] Mg prepared as above 0.1 Zn 0.9 (BH 4 ) 2 and Mg 0.1 Zn 0.9 (BH 4 ) 2 -Pd (palladium layer thickness is 10nm) for hydrogen absorption and desorption cycle test. The maximum temperature of dehydrogenation is 982K, and the heating rate is 23K / s; the subsequent cycle hydrogenation temperature is normal temperature, the pressure is 1MPa, and the time is 7.5 hours. The results show that the Mg without palladium layer 0.1 Zn 0.9 (BH 4 ) 2 did not show the reversibility of the hydrogen storage performance, and no hydrogen was detected during the dehydrogenation process after subsequent cyclic hydrogenation, while Mg 0.1 Zn 0.9 (BH 4 ) 2 -Pd exhibits good hydrogenation reversibility. Depend on figure 1 The partial pressure of hydrogen during the hydrogen release process is also known. The hydrogen storage material is reversible, and the initial temperature of the three hydrogen releases hardly changes. SEM pictures show that the Mg without palladium layer 0.1 ...

Embodiment 2

[0022] Mg prepared as above 0.2 Zn 0.8 (BH 4 ) 2 and Mg 0.2 Zn 0.8 (BH 4 ) 2 -Pd (palladium layer thickness is 20nm) for hydrogen absorption and desorption cycle test. The highest temperature for dehydrogenation is 982K, and the heating rate is 23K / s; the temperature for subsequent cycle hydrogenation is normal temperature, the pressure is 1MPa, and the time is 6 hours. The results show that the Mg without palladium layer 0.2 Zn 0.8 (BH 4 ) 2 did not show the reversibility of the hydrogen storage performance, and no hydrogen was detected during the dehydrogenation process after subsequent cyclic hydrogenation, while Mg 0.2 Zn 0.8 (BH 4 ) 2 -Pd exhibits good hydrogenation reversibility. Mg without palladium layer 0.2 Zn 0.8 (BH 4 ) 2 After hydrogenation and dehydrogenation at 982K, most of the material has peeled off from the substrate, while Mg 0.2 Zn 0.8 (BH 4 ) 2 -Pd still exhibits a complete and continuous form. It shows that the presence of the pall...

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Abstract

The reversible hydrogen storage material is prepared by depositing a layer of metal on the surface of metal borohydride and has a chemical formula Mg<x>Zn<1-x>(BH4)2-M, wherein x=0.05-0.95 and M is one of Pd, Pt, and Co. The preparation method comprises the following steps: co-depositing magnesium, zinc, and boron onto a silicon sheet in a hydrogen atmosphere through a physical vapor deposition method so as to obtain a metal borohydride Mg<x>Zn<1-x>(BH4)2; and then depositing palladium, platinum, or cobalt onto the surface of the obtained metal borohydride in a vacuum hydrogen-free environment through a vacuum sputtering method so as to obtain the reversible hydrogen storage material. The prepared reversible hydrogen storage material has good thermal stability and reversibility, the hydrogenation condition of the material is mild, moreover the primary dehydrogenation temperature is greatly reduced, thus the material can be applied to hydrogen storage and transportation, and the storage and transportation may become high efficient and more safe. The material can also be used to manufacture hydrogen fuel cell.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrogen storage materials, in particular to a metal borohydride with palladium, platinum or cobalt as the surface layer and a preparation method thereof. Background technique [0002] The development of modern society relies heavily on fossil energy, and the global environmental pollution and energy crisis caused by its massive consumption are becoming increasingly serious. The development and utilization of new energy "hydrogen energy" is imminent. Whether hydrogen energy can be realized in the near future mainly depends on the development of hydrogen storage technology. Existing technologies include gaseous hydrogen storage, liquid hydrogen storage, and solid hydrogen storage materials. Gaseous hydrogen storage requires high pressure and heavy storage tanks, with poor safety and low weight density; liquid hydrogen storage requires high energy consumption to maintain low temperature and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/06C23C14/06C23C14/18
CPCY02E60/36
Inventor 吕晓娟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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