A lithium-containing graphene oxide three-dimensional framework hydrogen storage material and its preparation method
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A technology of three-dimensional skeleton and hydrogen storage materials, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as inability to store hydrogen well, achieve the effects of enhancing chemical stability, preventing oxidation, and increasing yield
Active Publication Date: 2016-09-14
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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The graphene layer alone is not very good at storing hydrogen
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Embodiment 1
[0050] The method for preparing lithium-containing graphene oxide three-dimensional framework hydrogen storage material in this embodiment includes the following steps:
[0051] 1). Preparation of graphene oxide sheets and connection monomers;
[0052] 2) Using the graphene sheets obtained in step 1) and connecting monomers to prepare a three-dimensional graphene oxide skeleton;
[0053] 3) Using lithium naphthalene and the three-dimensional graphene oxide obtained in step 2) to react to prepare a graphene oxide framework material intermediate;
[0054] 4) Use carbon dioxide to react with the graphene oxide framework material intermediate obtained in step 3) to prepare lithium-containing graphene oxide three-dimensional framework hydrogen storage materials; the reaction process of (step 3) and 4) is as follows Figure 4 Shown)
[0055] among them:
[0056] Step 1) Using the Hummers method to prepare graphene oxide sheets, the thickness of the obtained graphene oxide sheets is 0.5-1.5nm, ...
Embodiment 2
[0066] The difference between this embodiment and embodiment 1 is that the linking agent of this embodiment is 4,4'-diphenylbutadiyne (diboric acid);
[0067] Step 1) Use 4-ethynylphenylboronic acid pinacol ester as raw material to prepare linking agent through coupling reaction and hydrolysis reaction (the process is as Figure 5 Shown), specifically including the following steps:
[0068] a) Take tetramethylethylenediamine (TMEDA), cuprous iodide and nickel chloride to dissolve nickel chloride and dissolve it in acetone (the ratio of each component is 4:1:1);
[0069] b) Add 4-ethynylphenylboronic acid pinacol ester to the solution obtained in a), and the mixture is stirred for 8-15 hours and then recrystallized in acetonitrile;
[0070] c), the crystalline product of step b) and NaIO 4 Dissolve in a mixed solvent of tetrahydrofuran (THF) and water, stir at 15-35°C for 1-3 hours;
[0071] d). Add 0.8-1.2mol / L hydrochloric acid to the solution obtained in step c), and stir and react f...
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Abstract
The invention discloses three-dimensional frame hydrogen storage material containing lithium oxidized graphene, which comprises an oxidized graphene lamella and a bridging agent; lithium element is doped on the bridging agent; the bridging agent monomer is 4, 4'-(acetylene radical-1,2-2 radical) bi ( diphenyl boric acid) or 4,4'- diphenyl diacetylene (hypoboric acid); two ends of the bridging agent are connected with the oxidized graphene lamella. The invention further discloses a preparation method for the hydrogen storage material; the preparation method comprises the following steps: firstly, the oxidized graphene lamella and the bridging monomer are prepared; then the oxidized graphene lamella and the bridging monomer are adopted to prepare an oxidized graphene three-dimensional frame; then naphthalene lithium and the oxidized graphene three-dimensional frame are adopted to prepare the intermediate of the oxidized graphene framework material; lastly, carbon dioxide and the intermediate are adopted to prepare the three-dimensional frame hydrogen storage material containing lithium oxidized graphene. According to the invention, the oxidized graphene interlayer is inserted into the bridging agent to form an oxidized graphene three-dimensional frame structure, the layer distance of the structure is adjusted to the optimal hydrogen storing distance, so that the hydrogen storing performance is improved greatly.
Description
Technical field [0001] The invention belongs to the field of hydrogen storage materials, and relates to a graphene-based hydrogen storage material, in particular to a lithium-containing graphene oxide three-dimensional framework hydrogen storage material. Background technique [0002] Hydrogen energy is an ideal new energy source and energy-containing energy source, and the key to restricting its practicality and scale is hydrogen storage. The current focus of hydrogen storage research will focus on the development and comprehensive evaluation of new, efficient and safe hydrogen storage materials. If the problem of hydrogen storage can be solved, clean, pollution-free, and zero-emission hydrogen fuel-powered vehicles will eventually replace traditional vehicles that burn oil and natural gas, which will cause revolutionary progress in the automotive industry. Therefore, there is a huge market demand for the development of efficient hydrogen storage materials. [0003] Carbon adsor...
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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30
CPCY02C20/40
Inventor 魏东山周丽娜赵晗黎静武永刚史浩飞
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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