High-hydrogen-storage-capacity lithium borohydride/graphene (LiBH4/RGO) composite hydrogen storage material and preparation method thereof

A hydrogen storage material and technology for hydrogen storage, applied in the production of hydrogen and other directions, can solve the problem of high hydrogen desorption temperature and achieve the effect of wide application

Inactive Publication Date: 2012-10-10
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved in the present invention is to overcome existing LiBH 4 The hydrogen desorption temperature is too high and other disadvantages, to provide a LiBH 4 Preparation of LiBH by homogeneous dispersion in RGO with tunable pore size and high specific surface area 4 / RGO high hydrogen storage composite hydrogen storage material

Method used

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  • High-hydrogen-storage-capacity lithium borohydride/graphene (LiBH4/RGO) composite hydrogen storage material and preparation method thereof
  • High-hydrogen-storage-capacity lithium borohydride/graphene (LiBH4/RGO) composite hydrogen storage material and preparation method thereof
  • High-hydrogen-storage-capacity lithium borohydride/graphene (LiBH4/RGO) composite hydrogen storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A LiBH 4 / RGO high hydrogen storage capacity composite hydrogen storage material, including 30wt% LiBH 4 material and 70wt% RGO material, the surface of RGO material has dense pores, LiBH 4 The material is evenly dispersed in the pores of the RGO material. RGO is prepared by a chemical redox method. RGO has a pore size of 2~10nm and a 2540m 2 / g specific surface area.

[0025] The aforementioned LiBH 4 Preparation method of RGO composite hydrogen storage material with high hydrogen storage capacity:

[0026] 1) Synthesized graphene (RGO) with controllable pore size and specific surface area by chemical redox method

[0027] Graphite oxide (GO) was prepared by a modified Hummers method. First weigh 0.5g graphite, 0.25gKNO 3 , placed in a 500mL three-neck flask, add 12mL concentrated H 2 SO 4 , and magnetically stirred for 30 min in an ice-bath environment. Then slowly add 1.5g KMnO 4 , stirred at 35°C for 24h, then slowly added 150mLH 2 O, stirred for 12h. ...

Embodiment 2

[0036] A LiBH 4 / RGO high hydrogen storage capacity composite hydrogen storage materials, including 30wt% LiBH 4 material and 70wt% RGO material, the surface of RGO material has dense pores, LiBH 4 The material is evenly dispersed in the pores of the RGO material. RGO is prepared by a chemical redox method. RGO has a pore size of 2~10nm, and 2540m 2 / g specific surface area.

[0037] The aforementioned LiBH 4 Preparation method of RGO composite hydrogen storage material with high hydrogen storage capacity:

[0038] 1) The preparation method of RGO is the same as in Example 1

[0039] 2) Preparation of RGO-doped LiBH by high-speed ball milling 4

[0040] Under the protection of argon atmosphere and anhydrous and oxygen-free conditions, the mass ratio of RGO and LiBH was 70:30. 4 After mixing evenly (the amount of about 0.1g) was placed in a sealed ball mill jar, and mechanically ball milled at room temperature for 4.5h (planetary ball mill QM-1SP2). Wherein, the rotat...

Embodiment 3

[0042] A LiBH 4 / RGO high hydrogen storage capacity composite hydrogen storage materials, including 60wt% LiBH 4 material and 40wt% RGO material, the surface of RGO material has dense pores, LiBH 4 The material is evenly dispersed in the pores of the RGO material. RGO is prepared by a chemical redox method. RGO has a pore size of 2~10nm and a 2540m 2 / g specific surface area.

[0043] The aforementioned LiBH 4 Preparation method of RGO composite hydrogen storage material with high hydrogen storage capacity:

[0044] 1) The preparation method of RGO is the same as in Example 1

[0045] 2) Preparation of RGO-doped LiBH by melt infiltration method 4

[0046] Under the protection of argon atmosphere and anhydrous and oxygen-free conditions, the RGO and LiBH 4 Mix evenly according to the mass ratio of 40:60, place it in a stainless steel reactor, and then fill it with H with an initial pressure of 100atm 2 , and then according to LiBH 4 The theoretical melting point is 2...

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Abstract

The invention relates to the field of the modification of hydrogen storage materials and provides a high-hydrogen-storage-capacity lithium borohydride / graphene (LiBH4 / RGO) composite hydrogen storage material and a preparation method thereof. According to the preparation method, the LiBH4 is uniformly dispersed into pore channels of the RGO which is prepared through a chemical redox method by adopting a melt infiltration method or a high-speed ball milling method under the protective atmosphere of inert gas. In the composite material, the RGO which is prepared through the chemical redox method has the pore diameter of 2-10 nm, the pore volume of 0.08-1.9 cm<3> / g and the specific surface area of 800-2540 m<2> / g, and the mass percent of the LiBH4 is 10-80 wt%. According to the LiBH4 / RGO composite hydrogen storage material provided by the invention, the initial hydrogen generation temperature is lower than 100 DEG C, the hydrogen generation volume at the temperature below 500 DEG C is 5-18 wt%, and the LiBH4 / RGO composite hydrogen storage material can be applied to the fields of hydrogen supply sources of fuel cells, hydrogen energy source vehicles and the like.

Description

technical field [0001] The invention relates to the field of modification of hydrogen storage materials, and provides a LiBH with high capacity and low temperature dehydrogenation 4 / RGO composite hydrogen storage material with high hydrogen storage capacity and its preparation method. Background technique [0002] The rapid development of the economy has led to an increasing demand for energy in the world, but the fossil energy that is currently the main energy source is depleting day by day, and the extensive use of fossil energy has caused serious environmental pollution and climate anomalies, so the development of new clean energy is a concern of all countries in the world major issues. Hydrogen energy has become a new type of clean energy with great development potential in the 21st century due to the advantages of high thermal efficiency in the combustion process, no exhaust gas emissions, and the product is water. It is used in many fields (especially electric vehicl...

Claims

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Application Information

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IPC IPC(8): C01B3/02
Inventor 陈智栋齐中清许娟曹剑瑜王文昌
Owner CHANGZHOU UNIV
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