CN203754427U - graphene generation device - Google Patents

Abstract

The utility model provides a graphite alkene generates device (1), it includes electrolysis trough (10), anchor clamps (18), at least one first electrode (11), at least one second electrode (12), graphite alkene material (13) and porous filling material (14). The electrolytic cell can be filled with an electrolyte (S), at least one second electrode being arranged opposite the first electrode. And the clamp clamps the first electrode and the second electrode. The graphene material may be disposed at the second electrode. The porous filler material may be disposed between the first electrode and the second electrode. The utility model discloses the porous filler material of accessible makes electrolyte can react with the graphite alkene material on the electrode uniformly. Therefore, the graphene generation device which can be produced at normal temperature, is low in cost, improves the efficiency and improves the overall production quality can be provided.

Description

Graphene generating device

technical field

The utility model is a generating device, in particular to a graphene generating device

Background technique

Graphene is a single-layer atom-thick carbon material, each carbon atom forms a bond with three adjacent atoms through ^sp2 mixing, and extends into a honeycomb two-dimensional structure. Moreover, graphene is also known for its good carrier mobility. Because of its excellent electrical properties, chemical stability, good thermal conductivity and high penetration rate, graphene has been widely used in Popular materials in fields such as semiconductors, touch panels or solar cells.

Generally, graphene can be produced by mechanical exfoliation, epitaxial growth, chemical vapor deposition (CVD) and chemical exfoliation. Among them, although the mechanical exfoliation method and the epitaxial growth method can generate graphene with better quality, neither of these two methods can synthesize graphene in large quantities.

Moreover, if the chemical vapor deposition method is used, the operating temperature is nearly a thousand degrees, and an expensive metal substrate is required, and the preparation process takes several hours to complete. The shortcomings of the above-mentioned methods all limit the production and subsequent application of graphene. The chemical exfoliation method is to generate graphene by redoxing graphite under the conditions of strong acid and strong oxidation. Although this method is suitable for mass production, the surface structure and size of the graphene it generates are not ideal.

In addition to the above-mentioned production methods, graphene can also be produced by electrochemical exfoliation. Its main principle of action is through the interaction between the electrolyte and the graphite surface, the surface layer of the graphite material of the anode is oxidized and peeled off. Although electrochemical exfoliation is known, the degree of exfoliation of the graphite raw material from the electrode cannot be controlled (maybe not completely exfoliated), and the space of the electrolytic cell cannot be used efficiently. However, compared with the above-mentioned other generation methods, the electrochemical exfoliation method can rapidly and economically produce graphene at room temperature. That is to say, if the generation efficiency and graphene yield of the chemical exfoliation method can be improved, the electrochemical The exfoliation method has become an economical and large-scale production method of graphene.

Therefore, how to provide a graphene generating device capable of producing at room temperature, with low cost, improved efficiency and improved overall production quality has become one of the important issues to be solved in this field.

Utility model content

The utility model proposes a graphene generating device capable of improving graphene output, generating efficiency and mass production.

A graphene generating device of the utility model comprises an electrolytic cell, a clamp, at least one first electrode, at least one second electrode, a graphene material and a porous filling material.

The electrolytic tank can be filled with electrolyte solution, and at least one second electrode is arranged opposite to the first electrode. And the clamp clamps the first electrode and the second electrode. Graphene material can be provided on the second electrode. A porous filling material may be disposed between the first electrode and the second electrode.

In one embodiment, it further includes a power supply, which is electrically connected to the first electrode and the second electrode respectively, and generates a potential difference between the first electrode and the second electrode.

In one embodiment, the first electrode and the second electrode have a potential difference between 5 volts and 100 volts.

In an embodiment, the potential difference may also be between 10 volts and 50 volts.

In one embodiment, it further includes a filter screen disposed between the porous filling material and the graphene material.

In one embodiment, the pore size of the porous filling material is between 5 μm and 1 mm.

In one embodiment, the porous filling material is a porous ceramic plate, sponge, foamed plastic, plastic mesh, zeolite, quartz wool or a combination thereof.

In one embodiment, the first electrode and the second electrode are made of graphite or metal.

In one embodiment, a liquid inlet unit and an exhaust unit are also included.

Based on the above, the utility model can interpose a porous filling material between the first electrode and the second electrode, and through the porous filling material, the electrolyte can evenly react with the graphene material on the electrode. Therefore, the utility model can achieve the purpose of providing a graphene generating device that can be produced at normal temperature, has low cost, improves efficiency and improves overall production quality.

Description of drawings

Fig. 1 is a schematic perspective view of a first embodiment of a graphene generating device of the present invention.

FIG. 2 is a schematic side view of the embodiment of FIG. 1 .

Fig. 3 is a bar graph of the quantity ratio-yield of the graphene generating device of the present invention and the known electrochemical stripping process.

Fig. 4 is a bar chart of the thickness distribution-proportion of the graphene generating device of the present invention and the known electrochemical stripping process.

Fig. 5 is a schematic side view of a second embodiment of the graphene generating device of the present invention.

【Symbol Description】

1: Graphene generating device

10, 10a: Electrolyzer

11, 11a: first electrode

12, 12a: second electrode

13, 13a: graphene material

14, 14a: Porous filling material

15: Power supply

16, 16a: liquid inlet unit

17a: filter screen

18, 18a: fixture

S: Electrolyte

Detailed ways

A graphene generating device according to a preferred embodiment of the present invention will be described below with reference to related drawings, wherein the same elements will be described with the same reference symbols.

Please refer to FIG. 1 to FIG. 4 first. FIG. 1 is a schematic perspective view of a first embodiment of a graphene generating device of the present invention. FIG. 2 is a schematic side view of the embodiment of FIG. 1 . Fig. 3 is the yield-bar graph of the graphene generating device of the present invention and the known electrochemical exfoliation process. Fig. 4 is a bar chart of the thickness distribution-proportion of the graphene generating device of the present invention and the known electrochemical stripping process.

The graphene generating device 1 of the first embodiment of the present invention includes an electrolytic cell 10 , at least one first electrode 11 , at least one second electrode 12 , a graphene material 13 , a porous filling material 14 and a fixture 18 .

The electrolytic cell 10 of this embodiment has a housing body, which can be filled with the electrolyte S. As shown in FIG. The electrolyte S in this embodiment can be a graphene solution.

Please specifically refer to FIG. 1 and FIG. 2 , at least one second electrode 12 is disposed opposite to the first electrode 11 , and the first electrode 11 and the second electrode 12 can form an electrode module. In addition, the first electrode 11 in this embodiment is an inert electrode made of graphite or metal. The second electrode 12 of the present embodiment can also be made of graphite material or metal, and the graphite material or metal material here can be made of materials such as natural graphite, artificial graphite, copper, stainless steel, platinum, etc., but not in these Materials are limited.

In addition, the graphene material 13 of this embodiment can be disposed on the second electrode 12 . Moreover, the arrangement of the graphene material 13 here may cover the second electrode 12 partially or completely. The graphene material 13 here can be any carbon material with graphitization arrangement, such as natural graphite and artificial graphite.

The porous filling material 14 may be disposed between the first electrode 11 and the second electrode 12 . In detail, the porous filling material 14 can also be arranged between the graphene material 13 and the second electrode 12, so, through this configuration, the porous filling material 14 provided in this embodiment can avoid the second electrode 12 and the graphene material 13 The problem of contact causing a short circuit. Moreover, the distance between the first electrode 11 and the second electrode 12 can also be adjusted by using different porous filling materials 14 (the separation distance is the thickness of the porous filling material 14 ) to adjust the overall reaction speed. In short, through the configuration of this embodiment, more than one electrode module can be stacked in the electrolytic cell 10 more effectively, and the overall output can be effectively improved.

In addition, the electrolyte S is evenly guided to the surfaces of the first electrode 11 and the second electrode 12 by using the holes thereon, and an electrochemical reaction is generated. Finally, the gas generated in the electrochemical reaction is discharged through the holes on it. It is supplemented that, through the pores of the porous filling material 14, the surface of the graphene material 13 can uniformly react with the electrolyte solution S, and the depth of the reaction can be controlled between 1 mm and 30 mm, preferably limited to Between 1mm and 10mm, the thickness of the exfoliated graphene product can be controlled.

Moreover, the porous filling material 14 of this embodiment can be selected from porous ceramic plates, sponges, foamed plastics, plastic nets, zeolite, quartz wool or combinations thereof, but not limited to these materials. In addition, the optional porous filling material 14 in this embodiment may have a pore size ranging from 5 μm to 1 mm.

The clamp 18 can sandwich the first electrode 11 and the second electrode 12 , that is to say, the first electrode 11 and the second electrode 12 of this embodiment are thus fixed and arranged between the clamps 18 . Therefore, through the setting of the clamp 18, the graphene material 13 of this embodiment can be fixed and confined between the porous material 14 and the second electrode 12, thus enabling the graphene material 13 to react completely, and can reach a peeling degree of 80%. .

In addition, the graphene generating device 1 of this embodiment may further include a power supply 15 , which is electrically connected to the first electrode 11 and the second electrode 12 respectively, and generates a potential difference between the first electrode 11 and the second electrode 12 . And the power supply 15 can provide direct current or alternating current.

In addition, the graphene generating device 1 of this embodiment may further include a liquid inlet unit 16 and an exhaust unit (not shown in the figure). The liquid inlet unit 16 is used to replenish the electrolyte S, and the exhaust unit is used to discharge the gas generated during the reaction.

During actual operation, the first electrode 11, the second electrode 12 and the porous filling material 14 are installed in the electrolytic cell 10 in sequence. Next, the electrolyte S is guided through the pores of the porous filling material 14 to make the electrolyte S contact the graphene material 13 on the second electrode 12 .

The first electrode 11 and the second electrode 12 have a potential difference. During the reaction, the potential difference will cause the electrolyte S to be electrolyzed to generate hydrogen and oxygen. These gases can overflow through the porous medium. And the potential difference in this embodiment can be between 5 volts and 100 volts. Preferably, the potential difference can also be between 10 volts and 50 volts.

When the gas is generated, the graphite monolayer or multilayer on the surface of the first electrode 11 will expand and peel off to become graphene flakes or graphene powder. The exfoliated graphene will remain in the electrolytic cell 10 . Finally, the exfoliated graphene was vacuum-dried to obtain the product.

The following will illustrate the possible collocation manners of this embodiment.

For example, the graphene material in this embodiment can be graphite powder, combined with the porous filling material 14 of alumina. The average pore diameter of alumina may be 5 μm, and the thickness of the porous filling material 14 in this embodiment is 5 mm, that is to say, the distance between the first electrode 11 and the second electrode 12 in this embodiment is 5 mm. The electrolyte is 0.25M sulfuric acid dissolved in 300ml (the operating temperature can be between room temperature and 40°C). The applied potential difference is 10V, the current is about 2A, and about 50mg of graphene powder can be generated when the reaction time is 8 hours.

It should be added that the pore size of the porous filling material 14 in this embodiment will be selected based on the replenishment speed of the electrolyte S and the gas dissipation speed. In addition, the stripping speed, properties and yield of graphene can also be changed by adjusting the concentration of electrolyte S, the type of electrolyte, the type of solvent and the potential difference.

Moreover, the graphene generating device 1 of this embodiment may also include a filtration and product separation module in other implementation manners. In order to realize the purpose of the continuous process, the exfoliated product of the graphene generating device 1 of the present embodiment can filter the unexfoliated coarse-grained graphite particles through the microporous screen of the module for filtering and separating the product, and obtain suitable graphite particles by screening. After the size of the product (generally thin-layer graphene below 10nm), a large amount of deionized water is used to remove the residual electrolyte, or other ionic solutions that can dissolve and replace residual ions are used to remove the residual electrolyte.

Please then refer to Fig. 3 and Fig. 4, Fig. 3 is the yield-bar graph through the graphene generating device of the present utility model and the known electrochemical stripping process. Fig. 4 is a bar chart of the thickness distribution-proportion of the graphene generating device of the present invention and the known electrochemical stripping process. FIG. 4 is a schematic diagram of the thickness distribution of graphene below 500 mesh in FIG. 3 .

And the diagram drawn in the figure is only a schematic diagram of one embodiment of the present invention, and its porous filling material is a porous ceramic plate, and 0.25M sulfuric acid can be used as its electrolyte. The data may be fine-tuned according to different porous filling materials and electrolytes, but the overall effects of the various embodiments are similar.

Therefore, it is known that the peak value of the main yield of electrochemical peeling falls below 500 mesh (mesh), and the peak value of the generated thickness is 10 to 20 nm. In the graphene generating device of the present invention, the peak value of the main output of graphene will fall below 500 mesh, and most of the generated thickness will fall in the interval of 5-10 nm. The 5-10nm graphene product is actually used and screened out for subsequent processing. That is to say, through the graphene generating device of the present invention, the output of available graphene in the product can be greatly increased, so as to achieve the purpose of improving efficiency and improving overall production quality.

Moreover, compared with the known electrochemical stripping process, the graphene generating device of the present utility model has at least the following advantages. First, the voltage used in the utility model is low, the operating temperature is normal temperature, and the thickness of the product will be concentrated in the industry. The required standard and device structure are simple and easy to operate, so the utility model can be applied and meets the requirements of mass production.

Finally, please refer to FIG. 5 , which is a schematic side view of a second embodiment of the graphene generating device of the present invention.

Similarly, the graphene generating device 1a of this embodiment includes an electrolytic cell 10a, at least one first electrode 11a, at least one second electrode 12a, a graphene material 13a, a porous filling material 14a and a fixture 18a. And this embodiment also includes a liquid inlet unit 16a.

There are two differences from the previous embodiments, one of which is that the graphene generating device 1a of this embodiment has two sets of electrodes, and each set of electrodes includes a first electrode 11a and a second electrode 12a. That is to say, the first electrode 11 a and the second electrode 12 a of the present invention are not limited to one set, and multiple sets can be combined in parallel in a modular manner.

In addition, the graphene generating device of this embodiment further includes a filter screen 17a, which is arranged between the porous filling material 14a and the graphene material 13a. The purpose of setting the filter screen 17a on the first electrode 11a is to prevent the unreacted graphite of the first electrode 11a from entering the porous filling material 14a, so that the pores of the porous filling material 14a will not be blocked. Moreover, the degree of diffusion of the electrolyte can be enhanced by the filter screen 17a.

In addition, the filter screen 17a of this embodiment can also be arranged between the second electrode 12a and the porous filling material 14a, and the purpose of setting the filter screen 17a here is to prevent the graphene material 13a on the second electrode 12a from entering the porous filling material 14a . In short, the overall efficiency of the device can be improved by disposing the filter screen 17a on the surface of the porous filling material 14a.

For example, the graphene material 13a of this embodiment can be graphite powder, and the porous filling material 14a is a sponge with an average pore diameter of about 1mm and a thickness of 10mm (the first electrode 11a and the second electrode 12a of this embodiment The spacing is 10mm). Filter screen 17a can be nylon mesh (its mesh size is about 300um), by applying voltage 20V to first electrode 11a and second electrode 12a, electric current is about 10A, and total reaction time is 8 hours, and electrolytic solution is dissolved in 300ml The 0.25M sulfuric acid solution is mixed with 30ml of potassium hydroxide (30wt%), and the operating temperature can be between room temperature and 40°C. In this configuration, the yield of graphene is about 500mg.

To sum up, by sandwiching the porous filling material between the first electrode and the second electrode, fixing the graphene material between the second electrode and the porous filling material through the clamp, and then matching the porous filling material, the electrolyte can be uniform. The ground reacts with the graphene material on the electrode. Therefore, the utility model can achieve the purpose of providing a graphene generating device that can be produced at normal temperature, has low cost, improves efficiency, improves overall production quality, and reduces electrode short circuit.

Although the technical content of the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any modifications and changes made by those skilled in the art without departing from the spirit of the present utility model should be included in the Within the scope of the utility model, therefore, the protection scope of the utility model should be regarded as defined by the claims.

Claims (9)

1. a Graphene generating apparatus, is characterized in that, comprising:

One electrolyzer, fills an electrolytic solution;

One fixture;

At least one the first electrode;

At least one the second electrode, is oppositely arranged with described the first electrode, and sandwiched described the first electrode of described fixture and described the second electrode;

One grapheme material, is arranged on described the second electrode; And

One porous packing material, is arranged between described the first electrode and described the second electrode.

2. device as claimed in claim 1, is characterized in that, also comprises a power supply unit, and it is electrically connected with described the first electrode and described the second electrode respectively, and makes described the first electrode and described the second electrode produce a potential difference.

3. device as claimed in claim 2, is characterized in that, described the first electrode and described the second electrode have a potential difference, and described potential difference is between 5 volts to 100 volts.

4. device as claimed in claim 3, is characterized in that, described potential difference is between 10 volts to 50 volts.

5. device as claimed in claim 1, is characterized in that, also comprises a filter screen, and it is arranged between described porous packing material and described grapheme material.

6. device as claimed in claim 1, is characterized in that, the pore size of described porous packing material is between 5 μ m to 1mm.

7. device as claimed in claim 1, is characterized in that, described porous packing material is porous ceramic plate, sponge, expanded plastic, plastic wire, zeolite, quartz silk floss or its combination.

8. device as claimed in claim 1, is characterized in that, described the first electrode and described the second electrode are made by graphite material or metal.

9. device as claimed in claim 1, is characterized in that, also comprises a feed liquor unit and an exhaust unit.