CN115746392A - Modified friction power generation sponge, single-electrode sponge friction power generation device, and preparation and application thereof - Google Patents
Modified friction power generation sponge, single-electrode sponge friction power generation device, and preparation and application thereof Download PDFInfo
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- CN115746392A CN115746392A CN202211492393.3A CN202211492393A CN115746392A CN 115746392 A CN115746392 A CN 115746392A CN 202211492393 A CN202211492393 A CN 202211492393A CN 115746392 A CN115746392 A CN 115746392A
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- 238000002360 preparation method Methods 0.000 title abstract description 11
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- 239000000463 material Substances 0.000 claims abstract description 13
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- 229960003638 dopamine Drugs 0.000 claims description 42
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 16
- 239000007983 Tris buffer Substances 0.000 claims description 14
- FYFFGSSZFBZTAH-UHFFFAOYSA-N methylaminomethanetriol Chemical compound CNC(O)(O)O FYFFGSSZFBZTAH-UHFFFAOYSA-N 0.000 claims description 14
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 14
- 150000003839 salts Chemical class 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
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- 238000005406 washing Methods 0.000 claims description 3
- YASYEJJMZJALEJ-UHFFFAOYSA-N Citric acid monohydrate Chemical compound O.OC(=O)CC(O)(C(O)=O)CC(O)=O YASYEJJMZJALEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229960002303 citric acid monohydrate Drugs 0.000 claims description 2
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 2
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- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 description 62
- 239000004205 dimethyl polysiloxane Substances 0.000 description 57
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- 238000004987 plasma desorption mass spectroscopy Methods 0.000 description 57
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- 238000006116 polymerization reaction Methods 0.000 description 11
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- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 6
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- VMAWODUEPLAHOE-UHFFFAOYSA-N 2,4,6,8-tetrakis(ethenyl)-2,4,6,8-tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane Chemical compound C=C[Si]1(C)O[Si](C)(C=C)O[Si](C)(C=C)O[Si](C)(C=C)O1 VMAWODUEPLAHOE-UHFFFAOYSA-N 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- MDLRQEHNDJOFQN-UHFFFAOYSA-N methoxy(dimethyl)silicon Chemical compound CO[Si](C)C MDLRQEHNDJOFQN-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Abstract
The invention relates to the technical field of friction nanometer generators, in particular to a modified friction power generation sponge, a single-electrode sponge friction power generation device, and preparation and application thereof. The surface of the friction power generation sponge frame is loaded with a friction coupling material, wherein the friction coupling material is MXene-polydopamine particles. The modified friction power generation sponge can be used as a single-electrode sponge friction generator device. The single-electrode sponge friction generator device can be used for energy collection, sea wave monitoring and the like, and has the advantages of simple preparation method, simple and convenient process flow, wide pressure response range, high sensitivity and long service life.
Description
Technical Field
The invention relates to the technical field of friction nanometer generators, in particular to a modified friction power generation sponge, a single-electrode sponge friction power generation device, and preparation and application thereof.
Background
Since the invention, the friction nano generator utilizes the friction electrification effect and the electrostatic coupling effect to quickly open up the heat tide of converting the tiny mechanical energy into the electric energy. Wave motion is repeated and is continuous day and night, if wave energy is combined with friction power generation, energy is collected and converted into electric energy, and the device has important significance in direct power supply/monitoring of ocean-going ships, offshore devices and the like. The sponge structure is simple to synthesize and good in elasticity, the prepared friction generator is small in relative displacement, and the sponge structure is simple to package and integrate and is very flexible in energy collection. The sponge friction generator can be used for solving the problems that the interior of a friction material is attenuated and cannot generate friction charges, each cavity in the sponge serves as a friction power generation unit, and the sponge friction generator is an integration of the unit cavities; the sponge material has excellent mechanical property and sensitive and wide-range pressure response performance, but the output performance of pure sponge is low, and the practical use is limited, so that the sponge material is subjected to material doping modification by a common means. Common modification modes are: mixing conductive materials such as carbon nanotubes and the like with a PDMS matrix, and realizing friction power generation between the hole wall and the hole wall due to the non-uniformity of doping; the Au nano particles enter the bottom of the hole of the PDMS through dipping to achieve the purpose of modifying the PDMS, so that the Au nano particles and the PDMS in the hole are charged in a contact manner; polypyrrole @ Cu sponge (positive) is used as a friction pair with PDMS sponge (negative), so that the purpose of increasing the output of the PDMS sponge is achieved. However, the preparation of the sponge needs multiple steps, the mechanical property is low, the durability is low, and the modification method has the problems of nonuniform modification and small output (not more than 200 nA) after modification, so that a new sponge preparation mode and a new sponge modification mode are needed to be found for preparing a sponge generator with high mechanical property, high durability, uniformity, composition and high output.
Disclosure of Invention
The invention aims to provide a modified friction power generation sponge, a single-electrode sponge friction power generation device, and preparation and application thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a friction coupling material is loaded on the surface of a friction power generation sponge frame, wherein the friction coupling material is MXene-polydopamine particles.
The friction power generation sponge is soaked and modified by MXene-dopamine trihydroxymethyl aminomethane buffer solution, and MXene and the surface of the sponge frame are polymerized under the action of the dopamine buffer solution.
The MXene-dopamine trihydroxymethyl aminomethane buffer solution is as follows: weighing 50-100 mg MXene, adding into 100-200 mL ionized water, and stirring for 4h; adding Tris powder to adjust the pH value of MXene aqueous solution to 8.5; adding 50-200 mg of dopamine powder, and continuously adding Tris powder to ensure that the pH value of the solution is 8.5 to obtain the MXene-dopamine trihydroxymethyl aminomethane buffer solution.
The friction power generation sponge is
1) Pressing and molding the sacrificial template salt particles in a mold;
2) Pouring the silica gel into a mould, and heating and forming after slowly permeating the salt particles;
3) And taking the silica gel out of the mold, and washing with water to remove the sacrificial template salt particles to obtain the friction power generation sponge.
4) And drying the sponge, immersing the sponge into the modified solution, taking out the sponge after immersion, and drying the sponge in vacuum to obtain the modified friction power generation sponge.
Laying the sacrificial template salt particles into a mold, compacting, adding silica gel, and heating at 50-80 ℃ for 2-1 h for molding; wherein the sacrificial template salt particles are one or more of NaCl, citric acid monohydrate, trisodium citrate dihydrate and dipotassium hydrogen phosphate.
The silicone (PDMS) is a mixture of a substrate and a curing agent according to a mass ratio of 10, 1, wherein the substrate is corning 184 silicone precursor liquid (commercially available), and the curing agent is a curing agent selected to match the corning 184 silicone precursor liquid (for example, dimethyl methyl hydrogen siloxane and tetramethyl tetravinylcyclotetrasiloxane, which are commercially available and matched according to production instructions).
A preparation method of a modified friction power generation sponge comprises the steps of soaking and modifying the friction power generation sponge through a trihydroxymethyl aminomethane buffer solution of MXene-dopamine, and polymerizing the MXene and the surface of a sponge frame under the action of the dopamine in the buffer solution.
A single-electrode sponge friction power generation device comprises the modified friction power generation sponge.
The modified friction power generation sponge is used as a friction material, the back of the modified friction power generation sponge is pasted with a Cu conductive adhesive tape and fixed on an acrylic plate which plays a supporting role, and the Cu connecting wire outputs current.
The application of the single-electrode sponge friction power generation device prepared by the method in energy collection and sea wave monitoring is provided.
The basic principle of the invention is as follows:
for the friction power generation sponge (PDMS sponge) modified by the invention, PDA-MXene particles are loaded on the sponge frame, and the distribution of the loaded particles is relatively uneven. Therefore, when pressure is applied to the sponge, contact occurs between the frames of the sponge, and the PDA-MXene particles are in contact with the exposed PDMS. MXene has strong electronegative property and higher electron capturing capacity than PDMS, so that negative triboelectric charge can be obtained. The PDMS matrix acquires a positive triboelectric charge. Under the unloading force, the PDMS has excellent elasticity, the sponge immediately restores the original shape, and MXene and PDMS with opposite charges are separated. In the process of separating MXene from PDMS, PDA is an excellent electronic conductor, and negative charges in MXene are transmitted to PDA; PDMS is a good electret material, has good polarization maintaining capability, induces positive charges on a Cu conductive adhesive tape to maintain electric neutrality, and forms instantaneous current in an external circuit. When the force is loaded again, the MXene-PDA is contacted with the PDMS, electrons on the Cu electrode connected with the PDMS flow away, and reverse instantaneous current is formed.
When the PDMS sponge is immersed into the MXene solution, MXene particles are easily absorbed into the skeleton of the sponge due to the existence of stirring force and the adsorption effect of the foam. Under the adhesion effect of PDA, MXene and PDMS are combined by a new covalent bond C-O-Ti, so that the stability of the modified sponge is improved. In addition, dopamine, as a phenolic compound, has the inherent characteristic of eliminating active oxygen free radicals, and can improve the retention life of MXene in air after being coupled with MXene.
The invention has the advantages that:
according to the invention, PDMS is prepared into porous sponge, and then is modified to be prepared into a single electrode mode, so that the internal space of the block material can be effectively utilized for friction power generation, and the volume power generation efficiency of the block material is increased; the sponge single-electrode generator has small relative displacement, small space required for completing contact and separation and convenient integration; after the sponge is modified, the electronegativity is increased, the output performance is improved, and MXene can be protected and the stability is improved by bonding the sponge and the modified particles through the PDA.
The invention adopts the sheet MXene material with negative electronegativity to modify the surface of PDMS, and utilizes the adhesion of polydopamine to anchor MXene on the surface of PDMS, thus improving the output current by 4 times.
Drawings
FIG. 1 is an SEM photograph of PDMS sponge in example 1 of the present invention
FIG. 2 is an SEM photograph of MXene-PDA in example 3 of the present invention
FIG. 3 is a strain-force curve of PDMS sponge in example 1 of the present invention
FIG. 4 shows the short-circuit current of the PDMS sponge as the single electrode TENG in example 1 of the present invention
FIG. 5 shows the open-circuit potential of PDMS sponge as the single electrode TENG in example 1 of the present invention
FIG. 6 shows the short-circuit current of a single electrode TENG made of PDMS sponge modified with MXene-PDA concentration 1:1 in example 2 of the present invention
FIG. 7 shows the open-circuit potential of a single electrode TENG made of PDMS sponge modified with MXene-PDA concentration of 1:1 in example 2 of the present invention
FIG. 8 shows the short-circuit current of a single electrode TENG made of PDMS sponge modified with MXene-PDA concentration 1:2 in example 3 of the present invention
FIG. 9 shows the open-circuit potential of a single electrode TENG made of PDMS sponge modified with MXene-PDA concentration of 1:2 in example 3 of the present invention
FIG. 10 shows the short-circuit current of a single electrode TENG made of PDMS sponge modified with MXene-PDA concentration 1:4 in example 4 of the present invention
FIG. 11 shows the open-circuit potential of TENG electrode using PDMS sponge modified with MXene-PDA concentration of 1:4 in example 4 of the present invention
FIG. 12 shows the short-circuit current of TENG in the vertical contact separation mode between the PDMS sponge with MXene-PDA concentration of 1:2 and Kapton in example 5 of the present invention
FIG. 13 shows the open circuit potential of the MXene-PDA concentration of 1:2 modified PDMS sponge for vertical contact separation mode TENG with Kapton in example 5
FIG. 14 is a diagram of an open circuit of 304SS PDMS sponge modified by MXene-PDA 1:2 as a TENG cathode protection in a vertical contact separation mode with Kapton in application example 1 of the present invention
FIG. 15 is a graph of current monitored by sea waves in application example 2 of the present invention
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be further described in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The friction power generation sponge is prepared by a template sacrificing method, and the PDA-MXene modified PDMS sponge is obtained by further doping; and further utilizing the PDA to adjust the adhesion of MXene on the surface of the PDMS so as to have triboelectric negativity, and simply preparing the modified PDMS sponge to obtain the single-electrode friction generator. The friction nano material and the generator have the advantages of simple preparation method, simple and convenient process flow, wide pressure response range, high sensitivity and long service life.
The invention is further explained below with reference to examples and figures.
Example 1
Preparing a friction power generation sponge:
1) Weighing a PDMS matrix and a curing agent according to a mass ratio of 10; ) 13g of 1.3g of curing agent selected to match the corning 184 silica gel precursor solution (e.g., dimethylmethylhydrosiloxane and tetramethyltetravinylcyclotetrasiloxane, both commercially available and matched according to the manufacturer's instructions).
2) In a dry environment, adding KH 2 PO 4 (the shape is regular, the length is 1-5mm, the number of the long strips is more) particles are paved on the cylindrical particles layer by layer
Compacting each layer of salt particles in the mould until the laying thickness of the salt particles reaches 25mm;
3) Pouring the PDMS solution which is uniformly stirred in the step 1) into the mould with the salt particles laid in the step 2), standing for 2 hours, putting into a vacuum drying oven, and continuously standing for 3 hours under the air pressure of 50 KPa; heating and curing the mold for bearing PDMS, and heating for 2h at 60 ℃; after heating, washing PDMS in the mold with a large amount of water while the PDMS is at the residual temperature, taking the mold down, and ultrasonically desalting the PDMS until the water is clear and colorless; drying the PDMS sponge at 60 ℃, and taking out the PDMS sponge for later use, namely the PDMS sponge (see figure 1).
From fig. 1 it can be seen that the microstructure of the sponge is 3D interconnected, the pore size in the sponge being much larger than inside the walls; in FIG. 1, the wall thickness is about 100 μm, the wall thickness at individual locations can be up to 300 μm, and the pore size ranges from about 400 μm to about 1200 μm; this indicates that the walls of the hole have sufficient space to perform the contacting and separating movements. Fig. 3 may plot the compressive force of PDMS sponges at different strains, with pressures of 6.2, 11.2, 16.7, 24.6, 79.1, 1556.6N producing compressive strains of 10%, 20%, 30%, 40%, 50%, 60%, and 80%, respectively. Small strains are easily achieved with small forces, but the force required to achieve large strains increases dramatically. After 80% strain, the sponge still recovered to its original shape without damage, indicating that repeated compression of the sponge could be achieved and that the sponge had a strong recovery capacity.
Adhering PMDS sponge on Cu conductive adhesive tapes with equal areas; cu connects the wire, derives the electron; the Cu conductive adhesive tape is fixed on an acrylic supporting plate of 50mm multiplied by 50 mm; the single-electrode friction nanometer generator is formed by friction power generation sponge and an induction electrode. In order to avoid the influence of the outside on the electrical output performance of the modified sponge, the other side of the sponge is adhered with a foam adhesive tape. The acrylic plate with the single electrode device fixed was tested for triboelectric generation performance (short circuit current and open circuit voltage) of the device by means of an electrometer (Keithley 6514) with the sponge driven by a linear motor. Each set of experimental data was measured for one hour to ensure adequate charging time of the sponge. Each set of experimental data was measured in triplicate, and the maximum value was taken as the final result, and it can be seen from fig. 4-5 that the short-circuit current was 36nA and the open-circuit voltage was 4V.
Example 2
Preparing a modified friction power generation sponge:
weighing 50mg of MXene, adding into 200mL of ionized water, and stirring for 4h; adding Tris powder to adjust the pH value of MXene aqueous solution to 8.5; adding 50mg of dopamine powder, and continuing to add Tris powder to make the pH value of the solution to 8.5 to obtain the MXene-dopamine trihydroxymethyl aminomethane buffer solution. The PDMS sponge prepared in the above embodiment is trimmed to a specific shape and wetted with alcohol; then the solution is put into MXene-dopamine trihydroxymethyl aminomethane buffer solution which is stirred by magneton. In the self-assembly process, dopamine is polymerized on the surfaces of MXene and PDMS, MXene particles are quickly adsorbed into the sponge, and then MXene can be fixed on the surface of PDMS through PDA. When PDA becomes a low polymer with a degree of polymerization of 2 to 4, dopamine stops polymerizing. With polymerization of dopamine, the aqueous solution turns from light yellow to brown and finally to black within tens of minutes, and stirring is kept for 12 hours; and taking out the black sponge, respectively soaking and cleaning the sponge by using deionized water and alcohol, then carrying out vacuum drying, and taking out the sponge for later use.
Adhering the PMDS sponge prepared in the above step to Cu conductive adhesive tapes with equal areas; cu connects the wire, derives the electron; the Cu conductive adhesive tape is fixed on an acrylic supporting plate of 50mm multiplied by 50 mm; the single-electrode friction nanometer generator is formed by friction power generation sponge and an induction electrode. In order to avoid the influence of the outside on the electrical output performance of the modified sponge, a foam adhesive tape is adhered to the other side of the sponge. The acrylic plate on which the single electrode device was fixed, the sponge was driven by a linear motor, and the triboelectric power generation performance (short-circuit current and open-circuit voltage) of the device was tested using an electrometer (Keithley 6514) (see fig. 6 and 7). Each set of experimental data was measured for one hour to ensure adequate charging time of the sponge. Each set of experimental data was measured in triplicate, and the maximum value was taken as the final result, and as can be seen from fig. 6 and 7, the short-circuit current was 62nA and the open-circuit voltage was 12V.
Example 3
Preparing a modified friction power generation sponge:
weighing 50mg of MXene, adding into 200mL of ionized water, and stirring for 4h; adding Tris powder to adjust the pH value of MXene aqueous solution to 8.5; adding 100mg of dopamine powder, and continuously adding Tris powder to ensure that the pH value of the solution is 8.5 to obtain the MXene-dopamine trihydroxymethyl aminomethane buffer solution. The PDMS sponge prepared in the above embodiment is cut into a specific shape and is wetted by alcohol; and then placing the sponge into MXene-dopamine trihydroxymethyl aminomethane buffer solution which is strongly stirred by magnetons, polymerizing the dopamine on the surfaces of MXene and PDMS in the self-assembly process of dopamine polymerization, and quickly adsorbing MXene particles into the sponge, namely fixing the MXene on the surface of the PDMS through PDA. When PDA becomes a low polymer with a degree of polymerization of 2 to 4, dopamine stops polymerizing. With polymerization of dopamine, the aqueous solution turns from light yellow to brown and finally to black within tens of minutes, and stirring is kept for 12 hours; and taking out the black sponge, respectively soaking and cleaning the sponge by using deionized water and alcohol, then carrying out vacuum drying, and taking out the sponge for later use. As can be seen from fig. 3, PDA particles in the shape of a round sphere are uniformly attached to the side and sheet of the lamellar MXene.
Adhering the PMDS sponge prepared in the above step to Cu conductive adhesive tapes with equal areas; cu connects the wire, derives the electron; the Cu conductive adhesive tape is fixed on an acrylic supporting plate of 50mm multiplied by 50 mm; the single-electrode friction nanometer generator is formed by friction power generation sponge and an induction electrode. In order to avoid the influence of the outside on the electrical output performance of the modified sponge, the other side of the sponge is adhered with a foam adhesive tape. An acrylic plate for fixing a single electrode device drives a sponge through a linear motor, and the frequency is 1Hz. The triboelectric performance (short circuit current and open circuit voltage) of the devices was tested using an electrometer (Keithley 6514). Each set of experimental data was measured for one hour to ensure adequate charging time of the sponge. Each set of experimental data was measured in triplicate, and the maximum value was taken as the final result, and it can be seen from fig. 8 and 9 that the short-circuit current was 153nA and the open-circuit voltage was 18V.
Example 4
Preparing a modified friction power generation sponge:
weighing 50mg of MXene, adding into 200mL of ionized water, and stirring for 4h; adding Tris powder to adjust the pH value of MXene aqueous solution to 8.5; adding 200mg of dopamine powder, and continuously adding Tris powder to ensure that the pH value of the solution is 8.5 to obtain the MXene-dopamine trihydroxymethyl aminomethane buffer solution. The PDMS sponge prepared in the above embodiment is trimmed to a specific shape and wetted with alcohol; and then placing the solution into MXene-dopamine trihydroxymethyl aminomethane buffer solution strongly stirred by magnetons, polymerizing dopamine on the surfaces of MXene and PDMS in the self-assembly process of dopamine polymerization, and quickly adsorbing MXene particles into the sponge, so that the MXene can be fixed on the surface of the PDMS through PDA. When PDA becomes a low polymer with a degree of polymerization of 2 to 4, dopamine stops polymerizing. With polymerization of dopamine, the aqueous solution turns from light yellow to brown and finally to black within tens of minutes, and stirring is kept for 12 hours; and taking out the sponge, respectively soaking and cleaning the sponge by using deionized water and alcohol, then drying the sponge in vacuum, and taking out the sponge for later use.
Adhering the PMDS sponge prepared in the above step to Cu conductive adhesive tapes with equal areas; cu connects the wire, derives the electron; the Cu conductive adhesive tape is fixed on an acrylic supporting plate of 50mm multiplied by 50 mm; the single-electrode friction nanometer generator is formed by friction power generation sponge and an induction electrode. In order to avoid the influence of the outside on the electrical output performance of the modified sponge, a foam adhesive tape is adhered to the other side of the sponge. An acrylic plate for fixing a single electrode device drives a sponge through a linear motor, and the frequency is 1Hz. The triboelectric performance (short circuit current and open circuit voltage) of the devices was tested using an electrometer (Keithley 6514). Each set of experimental data was measured for one hour to ensure adequate charging time of the sponge. Each set of experimental data was measured in triplicate, and the maximum value was taken as the final result, and it can be seen from fig. 10 and 11 that the short-circuit current was 111nA and the open-circuit voltage was 17V.
Example 5
Preparation of modified friction power generation sponge:
weighing 50mg of MXene, adding into 200mL of ionized water, and stirring for 4h; adding Tris powder to regulate the pH value of MXene water solution to 8.5; adding 100mg of dopamine powder, and continuously adding Tris powder to ensure that the pH value of the solution is 8.5 to obtain the MXene-dopamine trihydroxymethyl aminomethane buffer solution. The PDMS sponge prepared in the above embodiment is cut into a specific shape and is wetted by alcohol; and then placing the sponge into MXene-dopamine trihydroxymethyl aminomethane buffer solution which is strongly stirred by magnetons, polymerizing the dopamine on the surfaces of MXene and PDMS in the self-assembly process of dopamine polymerization, and quickly adsorbing MXene particles into the sponge, namely fixing the MXene on the surface of the PDMS through PDA. When PDA becomes a low polymer with a degree of polymerization of 2 to 4, dopamine stops polymerizing. With polymerization of dopamine, the aqueous solution turns from light yellow to brown and finally to black within tens of minutes, and stirring is kept for 12 hours; and taking out the sponge, respectively soaking and cleaning the sponge by using deionized water and alcohol, then drying the sponge in vacuum, and taking out the sponge for later use.
Adhering the PMDS sponge obtained by modifying the PDA-MXene on Cu conductive adhesive tapes with equal areas; cu connects the wire, derives the electron; the Cu conductive adhesive tape is fixed on an acrylic supporting plate of 50mm multiplied by 50 mm; a vertical contact separation mode friction nano-generator is composed of a friction power generation sponge, an induction electrode and another friction material, kapton (0.15 mm thick). The acrylic plate of the single-electrode device was fixed, and the sponge was periodically contacted and separated from the Kapton by a linear motor at a frequency of 1Hz. The triboelectric performance (short circuit current and open circuit voltage) of the devices was tested using an electrometer (Keithley 6514). Each set of experimental data was measured for one hour to ensure adequate charging time of the sponge. Each set of experimental data was measured in triplicate, and the maximum value was taken as the final result, and it can be seen from fig. 12 and 13 that the short-circuit current was 697nA and the open-circuit voltage was 79V.
Application example 1 cathodic protection
Cathodic protection experiments were performed using the triboelectric nanogenerator assembled in example 5 to obtain a vertical contact separation mode:
the acrylic plate on which the single electrode device was fixed, the sponge was periodically contacted and separated from Kapton by means of a linear motor, and triboelectric generation performance (short-circuit current and open-circuit voltage) of the device was tested using an electrometer (Keithley 6514). Stainless steel, platinum sheet, ag/AgCl electrode and simulated seawater (3.5 wt.% NaCl) were combined into a three-electrode system, and the cathodic protection potential of 304 stainless steel was tested using the chenhua electrochemical workstation (CHI 760). Rectifying TENG with a rectifier bridge, converting AC current into DC current after rectification, maintaining current pulse in the same direction, connecting the positive and negative electrodes of the output current to platinum sheet and 304SS respectively, moving electrons generated by TENG to 304SS, protecting stainless steel with cathode, and moving potential negatively. It can be seen from FIG. 14 that the modified PDMS sponge can lower the potential of 304SS from-0.13V to-0.42V, and shows excellent output stability at 3X 10 4 During the s period, the potential of 304SS when protected was stabilized at-0.42V.
Application example 2-wave monitoring
The single-electrode friction nano-generator obtained by assembly in example 3 was used for wave monitoring:
the modified single-electrode sponge TENG is packaged in vacuum and placed in a water tank (120 cm multiplied by 80cm multiplied by 40 cm), and a lead is led out to facilitate measurement. And (3) placing a wave making pump in the water tank, adjusting the distance between the wave making pump and the sponge to be 10cm, and testing to ensure that the force generated by the wave making pump on the sponge is small and is about 0.9-1.2N. The sponge is compressed by the waves, the sponge finishes recovery by means of self elasticity, the friction output current of the device is tested by using an electrometer (Keithley 6514), and the PDA-MXene modified PDMS sponge output current is 200nA under the output frequency of the wave making pump of 1Hz as can be seen from figure 15. Different wave levels and sea states correspond to different output currents, and the sea wave levels can be reflected through the output currents.
Claims (9)
1. The modified friction power generation sponge is characterized in that a friction coupling material is loaded on the surface of a friction power generation sponge frame, wherein the friction coupling material is MXene-polydopamine particles.
2. The modified triboelectric power generating sponge according to claim 1, wherein the triboelectric power generating sponge is modified by soaking in a tris buffer solution of MXene-dopamine, and MXene is polymerized with the surface of the sponge frame under the action of the buffer solution of dopamine.
3. The modified triboelectric power generating sponge according to claim 1 or 2, wherein said buffered solution of MXene-dopamine in Tris is: weighing 50-100 mg MXene, adding into 100-200 mL of ionized water, and stirring for 4h; adding Tris powder to adjust the pH value of MXene aqueous solution to 8.5; adding 50-200 mg of dopamine powder, and continuously adding Tris powder to ensure that the pH value of the solution is 8.5 to obtain the MXene-dopamine trihydroxymethyl aminomethane buffer solution.
4. The modified triboelectric power generating sponge according to claim 1 or 2,
the friction power generation sponge is
1) Pressing and molding the sacrificial template salt particles in a mold;
2) Pouring the silica gel into a mould, and heating and forming after slowly permeating the salt particles;
3) Taking the silica gel out of the mold, and washing with water to remove the sacrificial template salt particles to obtain the friction power generation sponge;
4) And drying the sponge, immersing the sponge into the modified solution, taking out the sponge after immersion, and drying the sponge in vacuum to obtain the modified friction power generation sponge.
5. The modified triboelectric power generation sponge according to claim 4, wherein the sacrificial template salt particles are laid in a mold to be compacted, then silica gel is added, and the mixture is heated at 50-80 ℃ for 2-1 h to be molded; wherein the sacrificial template salt particles are one or more of NaCl, citric acid monohydrate, trisodium citrate dihydrate and dipotassium hydrogen phosphate.
6. The method for preparing the modified friction power generation sponge as claimed in claim 1, wherein the friction power generation sponge is soaked and modified by a trihydroxymethyl aminomethane buffer solution of MXene-dopamine, and the MXene and the surface of the sponge frame are polymerized under the action of the buffer solution of the dopamine.
7. The utility model provides a single electrode sponge friction power generation device which characterized in that: the power generating device comprises the modified triboelectric power generating sponge of claim 1.
8. The single-electrode sponge friction power generation device according to claim 7, characterized in that: the modified friction power generation sponge is used as a friction material, the back of the modified friction power generation sponge is pasted with a Cu conductive adhesive tape and fixed on a supporting plate, and the Cu connecting wire outputs current.
9. The application of the single-electrode sponge friction power generation device prepared by the method of claim 7 is characterized in that: the single-electrode sponge friction power generation device is applied to energy collection and sea wave monitoring.
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| WO2022242256A1 (en) * | 2021-05-17 | 2022-11-24 | 江南大学 | Light-weight porous mxene-based composite thin film electromagnetic shielding material and preparation method therefor |
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| CN112397217A (en) * | 2019-08-13 | 2021-02-23 | 波音公司 | Conductive composite material |
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