CaF2-doped LiBH4 reversible hydrogen storage material with high hydrogen storage quantity and preparation method thereof

A hydrogen storage material and hydrogen storage technology are applied in chemical instruments and methods, hydrogen, borane/diborane hydride, etc., to achieve the effect of improving the kinetic performance of hydrogen absorption and desorption

Inactive Publication Date: 2011-05-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that doping MgF in lithium borohydride 2 It can also improve the hydrogen absorption and desorption p

Method used

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  • CaF2-doped LiBH4 reversible hydrogen storage material with high hydrogen storage quantity and preparation method thereof
  • CaF2-doped LiBH4 reversible hydrogen storage material with high hydrogen storage quantity and preparation method thereof
  • CaF2-doped LiBH4 reversible hydrogen storage material with high hydrogen storage quantity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: CaF 2 Doped LiBH 4 preparation of

[0036] CaF 2 Powder and LiBH 4 The powder is mixed at a molar ratio of 1:6, ball milled at 1000rpm for 10 hours, filled into a stainless steel reactor, vacuumed to 1 Pascal at 450°C, maintained for 1 hour, and then filled with hydrogen at 90 atmospheres (purity 99.999%), CaF can be produced by maintaining hydrogen pressure for 10 hours 2 Doped LiBH 4 .

Embodiment 2

[0037] Example 2: CaF 2 Doped LiBH 4 Hydrogen release performance

[0038] CaF 2 Powder and LiBH 4 The powder was mixed at a molar ratio of 1:6, ball milled at 800rpm for 16 hours, filled into a stainless steel reactor, vacuumed at 450°C to 1 Pascal, maintained for 5 hours, and then filled with hydrogen at 90 atmospheres (purity 99.999%), CaF can be produced by maintaining hydrogen pressure for 10 hours 2 Doped LiBH 4 .

[0039] Reduce the pressure to 1atm, with 10 o Heating at a heating rate of C / min, measuring the amount of hydrogen released by a flow meter, after the completion of the hydrogen release, then filling with 90 atmospheres of hydrogen (purity 99.999%), repeating 3 times. figure 2 is the kinetic performance of the 1st, 2nd, and 3rd hydrogen desorption, it can be seen that CaF 2 Doped LiBH 4 The hydrogen release is completely reversible.

Embodiment 3

[0040] Example 3: CaF 2 Doped LiBH 4 Hydrogen absorption performance

[0041] CaF 2 Powder and LiBH 4 The powder was mixed at a molar ratio of 1:6, ball milled at 500rpm for 12 hours, filled into a stainless steel reactor, vacuumed at 450°C to 0.5 Pascal, maintained for 3 hours, and then filled with hydrogen at 90 atmospheres (purity 99.999%), CaF can be produced by maintaining hydrogen pressure for 15 hours 2 Doped LiBH 4 .

[0042] Decrease the pressure to 1atm and dehydrogenate. After the dehydrogenation is completed, fill in hydrogen at 90 atmospheres (purity 99.999%), and record the CaF 2 Doped LiBH 4 The pressure drop when absorbing hydrogen is converted into the amount of hydrogen absorbed. Repeat 2 times, image 3 is the kinetic performance of the first and second hydrogen absorption, it can be seen that CaF 2 Doped LiBH 4 The hydrogen uptake is completely reversible.

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PUM

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Abstract

The invention aims at providing a CaF2-doped LiBH4 reversible hydrogen storage material with high hydrogen storage quantity and a preparation method thereof, belonging to the hydrogen storage material modification technology. The hydrogen storage material comprises powdery CaF2 and LiBH4, the molar ratio of CaF2 to LiBH4 is 1:6, the hydrogen storage material can also comprise a catalyst TiF3, CeF3 or NbCl5, and the molar ratio of the catalyst to LiBH4 is 0.1-0.5:6. According to the invention, CaF2-doped LiBH4 with high hydrogen storage capability can be used as a hydrogen source, provides pure hydrogen for fuel cells and can be manufactured into a large-scale commercially applied portable and movable power source to be applied to electric automobiles, electronic products, military equipment and the like. CaF2 has low cost and abundant resources. By applying CaF2 to improve the hydrogen absorbing and releasing properties of LiBH4, the cost of hydrogen storage can be reduced, which is beneficial to commercialization.

Description

technical field [0001] The invention relates to a hydrogen storage material modification technology, especially the use of CaF 2 Doping improves LiBH 4 A hydrogen storage material with reversible hydrogen absorption and desorption properties and a preparation method thereof. Background technique [0002] After the 1970s, due to the increasingly important research and development of hydrogen energy, especially in the 21st century, the rapid development of fuel cell technology, the safe storage and transportation of hydrogen have received increasing attention. The range of hydrogen storage materials extends from transition metal alloys to coordination hydrides. Transition metal alloys, such as lanthanum-nickel intermetallic compounds, have the property of reversibly absorbing and releasing hydrogen. Usually, hydrogen storage alloys store hydrogen in atomic form in the interatomic space of hydrogen storage alloys to form metal hydrides. However, hydrogen storage alloys usual...

Claims

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Application Information

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IPC IPC(8): B01J20/04C01B3/00C01B6/21
CPCY02E60/324Y02E60/32
Inventor 刘宾虹原佩佩李洲鹏
Owner ZHEJIANG UNIV
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