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A method for preparing noble metal aerogels based on ligand self-assembly

A noble metal and aerogel technology, applied in aerosol preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low mass transfer speed of low-dimensional noble metal nanomaterials and the utilization of noble metal atoms Low efficiency and other problems, to achieve the effect of electrocatalytic hydrogen evolution with high catalytic activity, wide application range and mild reaction conditions

Active Publication Date: 2021-05-25
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of low-dimensional noble metal nanomaterials such as slow mass transfer rate and low utilization rate of noble metal atoms, and to provide a preparation method of noble metal airgel with simple preparation method and mild reaction conditions

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  • A method for preparing noble metal aerogels based on ligand self-assembly
  • A method for preparing noble metal aerogels based on ligand self-assembly
  • A method for preparing noble metal aerogels based on ligand self-assembly

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Embodiment 1

[0036] 1. (a) Dissolve 50 mg (0.07 mmol) of glutamic acid derivative 1 in 15 mL of tetrahydrofuran, and add 500 μL of platinum nanowire ethanol solution under stirring at room temperature (according to the document J.Am.Chem.Soc.2013, 135 , prepared by the method disclosed in 9480-9485, wherein the Pt nanowire is composed of a nanobeam formed by a single nanowire with a diameter of 1-3 nm and a length of 3-5 μm), and then placed in a light-proof condition at 30-40 ° C After stirring for 12 hours, the obtained black product was repeatedly centrifuged and washed 3 to 5 times with tetrahydrofuran.

[0037] (b) Dissolve 50mg (0.07mmol) of glutamic acid derivative 1 in 15mL of tetrahydrofuran, add the black product after centrifugation and washing in step (a) under the condition of stirring at room temperature, and then stir at 30-40°C under the condition of avoiding light After 12 hours, the black product obtained was repeatedly centrifuged and washed 3 to 5 times with tetrahydrof...

Embodiment 2

[0043] The functionalized Pt-L1 nanomaterial was prepared according to the method of Example 1. 25 mg of functionalized Pt-L1 nanomaterials were ultrasonically dispersed in 0.3 mL of toluene, heated at 50 °C for 5 min, and then naturally cooled to room temperature to form a stable gel, which was passed through supercritical CO 2 After drying, Pt airgel was obtained.

Embodiment 3

[0045] 1. (a) Dissolve 60 mg (0.07 mmol) of glutamic acid derivative 2 in 15 mL of tetrahydrofuran, and add 500 μL of platinum nanowire ethanol solution under stirring at room temperature (according to the document J.Am.Chem.Soc.2013, 135 , prepared by the method disclosed in 9480-9485, wherein the Pt nanowire is composed of a nano-beam formed by a single nanowire with a diameter of 1-3 nm and a length of 3-5 μm), and then in the dark Stirring at 30-40°C for 12 hours under the condition, the obtained black product was repeatedly centrifuged and washed 3-5 times with tetrahydrofuran.

[0046](b) Dissolve 60mg (0.07mmol) of glutamic acid derivative 2 in 15mL of tetrahydrofuran, add the black product after centrifugation and washing in step (a) under the condition of stirring at room temperature, and then stir at 30-40°C under the condition of avoiding light After 12 hours, the black product obtained was repeatedly centrifuged and washed 3 to 5 times with tetrahydrofuran.

[004...

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Abstract

The invention discloses a method for preparing noble metal airgel based on ligand self-assembly. Glutamic acid derivatives are grafted on the surface of noble metal nanomaterials, and a stable gel is formed through the self-assembly of functionalized noble metal nanomaterials in different solvents. Glue, after drying to obtain noble metal airgel, the structural formula of the above-mentioned glutamic acid derivative is or wherein x, y, z each independently represent an integer of 7-13. The preparation method of the noble metal airgel of the present invention is simple and the conditions are mild, and the regulation of the gelation behavior can be realized by adjusting the length of the ligand linking arm and the number of action sites, and the adjustment of the ratio of the functionalized noble metal nanomaterial to the solvent can realize the material Density control. The noble metal airgel prepared by the method of the invention has high activity for electrocatalytic hydrogen evolution.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer materials, and in particular relates to a method for preparing noble metal airgel by self-assembly of functional ligand molecules. Background technique [0002] Since the 20th century, people's research on nanomaterials has gradually deepened, and more and more noble metal nanomaterials have been applied in the field of electrocatalysis. In the electrocatalytic process, most of the research is devoted to improving the scale and morphology of noble metal materials. Due to the large size, the surface active sites inside the noble metal catalyst are not easily exposed, and the slow mass transfer rate greatly reduces the utilization rate of the noble metal, which greatly reduces the advantage of the large specific surface area of ​​nanomaterials. [0003] Noble metal aerogels have become the focus of aerogel research because they have both the inherent photoelectric and catalytic pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00C25B1/04C25B11/054C25B11/085B01J35/00B01J23/42
CPCB01J13/0095C25B1/04C25B11/04B01J23/42B01J35/23Y02E60/36
Inventor 严军林郑岩李娜杨丹刘静
Owner SHAANXI NORMAL UNIV
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