KR20220145464A - Non-polar Liquid Lubricant Submerged Triboelectric Nanogenerator for Current Amplification via Direct Electron Flow - Google Patents

Abstract

The present invention relates to a triboelectric nano-generator having a liquid lubricant for current amplification through direct electron flow and an operating method thereof and, more specifically, to a triboelectric nano-generator having a liquid lubricant for current amplification through direct electron flow which comprises: an inner cylinder having a dielectric; at least one plate electrode surrounding an outer surface of the inner cylinder to be spaced apart by a specific distance; a plurality of rolling electrodes positioned between the plate electrode and the inner cylinder; and a liquid lubricant filled in a space between the plate electrode and the inner cylinder.

Description

Non-polar Liquid Lubricant Submerged Triboelectric Nanogenerator for Current Amplification via Direct Electron Flow

The present invention relates to a triboelectric nanogenerator having a liquid lubricant for current amplification through direct electron flow and a method for operating the same.

Triboelectric nanogenerators (TENG) can convert input mechanical energy into electrical energy output through Maxwell's displacement current representing current.

This potential of TENG was demonstrated by analyzing the generation mechanism, fabricating materials with higher surface charge, and increasing the surface area by realizing micro/nanostructured surfaces.

TENGs with increased power are being used as auxiliary power sources for a variety of self-powered sensors for portable electronics, chemistry, and motion sensing. Despite these advantages, recent studies can lead to air breakdown and low current output generation by certain limitations of high surface potential.

In particular, typical TENG structures consist of electrodes and dielectric layers that exhibit relative motion, and this phenomenon can lead to air breakdown and low current output. To alleviate the electrical problem, some researchers have tried strategies such as changing the surrounding environment, using liquids to suppress air destruction, and inducing microplasma to ensure high currents.

In addition, several known mechanical limitations of TENGs can prevent exposing the polymer dielectric to excessive input forces, either through mechanical design or the use of lubricants, which can significantly shorten the TENG life. Despite these efforts to solve mechanical or electrical problems, simultaneously addressing electrical and mechanical limitations requires further optimization of the generation mechanism and structure.

Republic of Korea Patent Registration 10-1728472 Republic of Korea Patent Registration 10-1800091 Republic of Korea Patent Registration 10-1685184 Republic of Korea Patent 10-2101085

Therefore, the present invention has been devised to solve the problems of the prior art. According to an embodiment of the present invention, when a non-polar liquid lubricant is filled in a triboelectric nanogenerator, the long Debye length of the lubricant causes air destruction. current through direct electron flow, generating high voltage and current outputs up to 200V and 170mA, respectively, to charge commercial capacitors and batteries, rolling friction and lubrication can greatly reduce the friction wear of the device. An object of the present invention is to provide a triboelectric nanogenerator having a liquid lubricant for amplification and a method for operating the same.

And according to the embodiment of the present invention, the friction wear during operation is significantly reduced, which improves the mechanical stability of the TENG, and the rolling electrode inside the TENG reduces the friction between the solid surface and the direct generated when the rolling electrode and the plate electrode are in contact. Helps to amplify current through electron flow, this invention using liquid lubricant and direct electron flow can generate instantaneous and root mean square (RMS) power of 0.6 W and 1.26 mW, respectively, at low speed rotation of 100 rpm. triboelectric with liquid lubricant for current amplification through direct electron flow, which can also produce voltage and current outputs of up to 220V and 170mA, respectively, when connected to a rectifier circuit sufficient to charge commercial capacitors and lithium-ion batteries. An object of the present invention is to provide a nanogenerator and a method for operating the same.

On the other hand, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly to those of ordinary skill in the art to which the present invention belongs from the description below. can be understood

A first object of the present invention is, in a triboelectric nanogenerator, an inner cylinder having a dielectric; at least one plate electrode surrounding the inner cylinder to be spaced apart from the outer surface; a plurality of rolling electrodes positioned in contact between the plate electrode and the inner cylinder; and a liquid lubricant filled in the space between the plate electrode and the inner cylinder.

And the liquid lubricant may be a non-polar liquid lubricant.

In addition, it may be characterized in that the dielectric layer is laminated at least once on the outer surface of the inner cylinder.

And the dielectric layer may be characterized in that the PTFE.

In addition, it further includes an external cylinder positioned to be spaced apart from the internal cylinder at a specific distance, the plate electrode is coupled to the inner surface of the external cylinder, the rolling electrode is configured in a rod shape, and is installed in front and rear of the external cylinder, respectively It may further include a jig for fixing the longitudinal and radial movement positions of the plurality of rolling electrodes.

And the rolling electrode and the plate electrode may be made of aluminum, and a Teflon wrapping wire may be attached to the plate electrode.

In addition, the inner cylinder, the outer cylinder and the jig may be characterized in that it is composed of PMMA.

And the non-polar liquid lubricant may include at least one of mineral oil and silicone oil.

In addition, by the non-polar liquid lubricant, air destruction and field emission of the surface charge of the dielectric layer are suppressed, the operating friction of the rolling electrode is reduced, and direct electron flow is induced between the rolling electrode and the plate electrode. have.

A second object of the present invention is a method of operating a triboelectric nanogenerator according to the first object mentioned above, comprising the steps of: rotating an inner cylinder by external input energy and rotating the rolling electrode in association with each other; charging the dielectric layer on the outer surface of the inner cylinder to be negatively charged; inducing a positive charge to the rolling electrode in contact with the dielectric layer and causing polarization; and when the rolling electrode is in contact with the plate electrode, the electrons accumulated in the rolling electrode directly flow to the plate electrode. can be achieved as a method of operation of

According to the triboelectric charging nanogenerator having a liquid lubricant for amplification of current through direct electron flow according to an embodiment of the present invention and an operating method thereof, when the non-polar liquid lubricant is filled in the triboelectric charging nanogenerator, the long Debye of this lubricant Due to its length, it can effectively block air breakage, and rolling friction and lubrication can greatly reduce the friction wear of the device, generating high voltage and current output of up to 200V and 170mA respectively, which has the effect of charging commercial capacitors and batteries. have

And according to the triboelectric charging nanogenerator having a liquid lubricant for current amplification through direct electron flow and its operating method according to an embodiment of the present invention, friction wear during operation is significantly reduced to improve the mechanical stability of the TENG, and the internal TENG The rolling electrode of the present invention using liquid lubricant and direct electron flow reduces friction between the solid surfaces and helps to amplify the current through the direct electron flow that occurs when the rolling electrode and the plate electrode come in contact. It can generate instantaneous and root mean square (RMS) power of 0.6W and 1.26mW, respectively, at low speed rotation, and can also generate voltages up to 220V and 170mA, respectively, when connected to a rectifier circuit sufficient to charge commercial capacitors and lithium-ion batteries. It has the effect of generating a current output.

On the other hand, the effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so the present invention is limited only to the matters described in those drawings and should not be interpreted.
1 is a perspective view of a triboelectric charging nanogenerator (LLS-TENG) having a non-polar liquid lubricant for current amplification through direct electron flow according to an embodiment of the present invention;
2 is an exploded perspective view of an LLS-TENG according to an embodiment of the present invention;
3 is a partial cross-sectional view of an LLS-TENG according to an embodiment of the present invention;
4 is a comparative schematic diagram of suppression of field emission of air (i) and liquid lubricant of LLS-TENG according to an embodiment of the present invention;
5 is a VOC graph for air and liquid lubricant conditions;
6 is an ICC graph for air and liquid lubricant conditions;
7a and 7b show the difference in Debye length (λD) for polar (FIG. 7A) and non-polar (FIG. 7B) liquids.
8a and 8b show the VOC and ICC output of LLS-TENG in different liquids.
9 is a partial cross-sectional view of an LLS-TENG showing an operating mechanism according to an embodiment of the present invention;
10A and 10B are a VOC (FIG. 10A) and an enlarged VOC output (FIG. 10B) of an LLS-TENG according to an embodiment of the present invention;
11A is an instantaneous voltage, current, and power output graph of an LLS-TENG according to an embodiment of the present invention;
11B is an RMS voltage, current, and power output graph of an LLS-TENG according to an embodiment of the present invention;
12A and 12B are a photograph (FIG. 12A) and a rectifier circuit (FIG. 12B) of an LLS-TENG manufactured according to an embodiment of the present invention;
13A and 13B are a circuit configuration and a photograph of 319 LEDs connected in series (FIG. 13A) and in parallel (FIG. 13B);
14 is a rectified voltage and current of an LLS-TENG according to an embodiment of the present invention;
15 is an LLS-TENG charging commercial 100, 200 and 300 μF capacitor according to an embodiment of the present invention;
16 is a graph showing a charging graph of an LLS-TENG commercial lithium-ion battery according to an embodiment of the present invention.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed subject matter may be thorough and complete, and that the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In this specification, when a component is referred to as being on another component, it may be directly formed on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components is exaggerated for effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional and/or plan views, which are ideal illustrative views of the present invention. In the drawings, thicknesses of films and regions are exaggerated for effective description of technical content. Accordingly, the shape of the illustrative drawing may be modified due to manufacturing technology and/or tolerance. Therefore, the embodiments of the present invention are not limited to the specific form shown, but also include changes in the form generated according to the manufacturing process. For example, the region shown at a right angle may be rounded or have a predetermined curvature. Accordingly, the regions illustrated in the drawings have properties, and the shapes of the regions illustrated in the drawings are intended to illustrate a particular shape of the region of the device and not to limit the scope of the invention. In various embodiments of the present specification, terms such as first, second, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, 'comprises' and/or 'comprising' does not exclude the presence or addition of one or more other elements.

In describing the specific embodiments below, various specific contents have been prepared to more specifically describe the invention and help understanding. However, a reader having enough knowledge in this field to understand the present invention may recognize that the present invention may be used without these various specific details. In some cases, it is mentioned in advance that parts that are commonly known and not largely related to the invention are not described in order to avoid confusion without any reason in describing the present invention in describing the invention.

Hereinafter, the configuration, function and operation mechanism of a triboelectric nanogenerator (hereinafter, LLS-TENG 100 ) having a non-polar liquid lubricant for amplification of current through direct electron flow according to an embodiment of the present invention will be described.

First, FIG. 1 shows a perspective view of a triboelectric charging nanogenerator (LLS-TENG 100) having a non-polar liquid lubricant for current amplification through direct electron flow according to an embodiment of the present invention, and FIG. 2 is a perspective view of the present invention. is an exploded perspective view of the LLS-TENG according to the embodiment. 3 is a partial cross-sectional view of an LLS-TENG according to an embodiment of the present invention.

And Figure 4 shows a comparison schematic diagram of field emission suppression of air (i) and liquid lubricant (ii) of LLS-TENG 100 according to an embodiment of the present invention, and Figure 5 is VOC for air and liquid lubricant conditions Graph, FIG. 6 shows an ICC graph for air and liquid lubricant conditions.

As shown in FIGS. 1 to 3, the LLS-TENG 100 according to an embodiment of the present invention has an outer cylinder 1, an inner cylinder 2, a dielectric layer 10, a rolling electrode 20, and a plate electrode. (30), it can be seen that it can be configured to include a non-polar liquid lubricant (40).

The inner cylinder 2, the outer cylinder 1, and the jig 3 may be made of polymethyl methacrylate (PMMA). In addition, the rolling electrode 20 may be made of aluminum in the form of a rod, and the surface of the inner cylinder 2 may be coated with the dielectric layer 10 at least once or more. This dielectric layer may be comprised of polytetrafluoroethylene (PTFE 10). Also, the inner cylinder 2 itself may be made of PTFE 10 .

Four curved plate electrodes 30 are installed on the inner surface of the outer cylinder 1 of PMMA. The plate electrode 30 may be made of aluminum. In addition, the non-polar liquid lubricant 40 according to the embodiment of the present invention is to be filled in the space between the PTFE (10) layer and the plate electrode (30). That is, the space between the inner cylinder (2) and the outer cylinder (1) is filled.

As the inner cylinder 2 having the dielectric layer 10 rotates through external input energy, the six aluminum rolling electrodes 20 are also rotated inside the LLS-TENG 100 . The present invention proposed using the rolling electrode 20 and the liquid lubricant 40 allows for improved current output and reduced friction damage.

That is, the occurrence of air breakage due to the negative surface charge of the dielectric layer 10 (PTFE) is suppressed by the liquid lubricant 40 . In particular, the negative charge induces a positive charge at the top of the rolling electrode 20 and causes polarization at the rolling electrode 20 .

Due to the suppression of air destruction, the LLS-TENG 100 can produce a higher electrical output compared to a TENG operating on air. In addition, when the rolling electrode 20 comes into contact with the plate electrode 30 , electrons accumulated in the rolling electrode 20 flow directly to the plate electrode 30 . This direct electron flow creates a high current output during rotation.

Wear damage is also greatly reduced through rolling friction and lubrication.

During air breakage and field emission, the PTFE 10 surface will exhibit a limiting charge density in air. Thus, according to Paschen's law, a field strength of about 3 kV/mm can cause air breakdown, and a low field strength can cause field emission in microscale gaps.

However, when the charged surface is immersed in the liquid lubricant 40, the electric field strength required for fracture increases to 20 kV/mm and the minimum electric field strength required to generate field emission increases. Therefore, an increase in the surface charge of the PTFE (10) can be observed in the liquid condition (Fig. 4). Also, when the device is immersed in lubricant 40, the electric field is reduced. The rolling electrode 20 material is aluminum and the dielectric layer 10 is a PTFE (10) film.

Figure 4 shows the results when each of the LLS-TENG is filled with air and mineral oil. The permittivities of air and mineral oil are 1 and 2.1, respectively. The surface charge density of the surface of the PTFE 10 is -10 μC m ^-2 and the rolling electrode 20 is set to float. According to the simulation results, an electric field is formed between the rolling electrode 20 and the PTFE (10) film in an air and lubricant environment. When the device is operated in air and lubricant environments, the maximum strength of the electric field is 5.02 and 2.42 kV mm ^-1 , respectively. Depending on the dielectric constant of mineral oil, the electric field strength of mineral oil is lower than that of air. In general, the electric field strength at a point can be described as Equation 1 below.

[Equation 1]

where E is the electric field strength, Q is the charge, ε _r is the relative permittivity, ε ₀ is the vacuum permittivity, and d is the distance dl between the charge and the point. According to Equation 1, the dielectric constant of the material between the electrode and the dielectric surface affects the electric field strength. With mineral oil, the electric field strength decreases as the dielectric constant increases. These interpretations are consistent with the simulation results obtained for the lubricant environment. Nevertheless, as the dielectric constant increases, the electric field strength in the lubricant 40 decreases but the electric flux density increases. As a result, the induced positive charge remains unchanged. According to Gauss's law, the electric flux density (D) is related to the electric field strength (E) as

[Equation 2]

The induced charge is related to the electrical flux of the electrode. Consequently, the positive charge induced in the electrode does not change with the permittivity regardless of the material used (lubricating agent or air). Nevertheless, due to the high electric field strength of air, air breakdown occurs, limiting the surface charge.

Due to this reduced surface charge, the electrical flux density associated with the negative charge on the surface of the PTFE 10 decreases compared to that of mineral oil. Therefore, there is a significant difference in the electrical output of the LLS-TENG 100 in the air and lubricant 40 environment.

5 shows the open circuit voltage (VOC) output of the LLS-TENG during operation. As shown in Figure 5, the maximum VOC is about 28V when the device operates in an ambient environment. However, it can be seen that when the generator is filled with liquid lubricant 40, the maximum VOC increases to 200V.

In addition, it can be seen that the closed circuit current (ICC) output of the lubricant (85 mA) LLS-TENG 100 is significantly higher than that of air (5 mA) as shown in FIG. 6 . The peak ICC output has less electrical peak compared to the VOC, but as can be seen from the enlarged output plot that will be described later, the ICC output in the range of 5 to 10 mA is continuously generated when the LSS-TENG 100 rotates. This increased electrical output shows that the introduction of liquid lubricant 40 improves the mechanical life and electrical performance of the TENG.

7A and 7B show the difference in the Diby length (λD) for polar (FIG. 7A) and non-polar (FIG. 7B) liquids. And Figures 8a and 8b show the VOC and ICC output of the LLS-TENG in different liquids.

For TENGs using liquids as triboelectric materials, the electric double layer (EDL) appears to have a significant effect on the electrical output. When a liquid hits a solid surface with an electric charge, the liquid molecules form two layers parallel to the solid surface.

The length of the EDL is defined as the Debye length (λD) and the electrostatic charge on the solid surface is screened for each Debye length. That is, when a solid material with a surface charge is immersed in a liquid, the surface charge is blocked by the charge carriers of the liquid, such as electrons, ions, or molecules. 7A and 7B, the LLS-TENG 100 includes a PTFE 10 cylinder exhibiting a negative surface charge and a rolling electrode 20 in contact with the surface. When the device is immersed in a polar liquid, the molecules of the polar liquid block the electrostatic field of negative surface charge on the PTFE (10) surface (Fig. 7a). Due to such screening, the positive charge induced in the rolling electrode 20 is greatly limited.

However, since non-polar liquids such as mineral oil and silicone oil have a larger Debye length than polar liquids (Fig. 7b), a higher negative charge of PTFE 10 is induced in the rolling electrode 20 through the polarization of the electrode. The geometrically larger Debye length of the non-polar liquid corresponds to a higher surface area due to the influence of the negative surface charge of PTFE (10). Moreover, charge screening specific to polar liquids and non-polar liquids occurs at the surface of the rolling electrode 20 .

8a and 8b show the VOC and ICC output when LLS-TENG is filled with mineral oil, silicone oil, castor oil, water and ethyl alcohol, respectively. Mineral oil/silicone oil is a typical non-polar liquid, while water/ethyl alcohol is a polar liquid.

The highest electrical output was produced when filled with mineral oil. Moreover, when the device was filled with water and ethyl alcohol, the generated electrical output was almost zero and could not be measured. In general, castor oil is more polar than other oils because of the presence of hydroxyl functional groups in ricinoleic acid. Therefore, the electrical output for castor oil was lower than for other non-polar liquids. The electrical output result depends on the device length of the liquid. In general, the Via length of polar liquids is relatively small (the Debye length of water is only 10-20 nm, and the length of ethanol is about 38 nm). In contrast, the Debye length of non-polar liquids is much larger than that of polar liquids, over 1 μm.

9 is a partial cross-sectional view of an LLS-TENG showing an operation mechanism according to an embodiment of the present invention. 10A and 10B are a VOC (FIG. 10A) and an enlarged VOC output (FIG. 10B) of an LLS-TENG according to an embodiment of the present invention, and FIG. 11A is an instantaneous voltage of an LLS-TENG according to an embodiment of the present invention. , current and power output graphs are shown. Also, FIG. 11B shows graphs of RMS voltage, current, and power output of the LLS-TENG according to an embodiment of the present invention.

The operating mechanism of the LLS-TENG 100 for generating an output includes three main steps, as shown in FIG. 9 .

First, the negative charge of the surface layer of the PTFE (10) induces a positive charge in the rolling electrode (20). Naturally, the negative charge is separated from the positive charge by the surface of the PTFE 10 and accumulated on the opposite side. As the rolling electrode 20 approaches the plate electrode 30, direct electron flow occurs as the two electrodes come into contact with each other.

The electrical output of the LLS-TENG 100 is amplified due to this flow. The liquid lubricant 40 inhibits air breakage, increasing the surface charge of the PTFE 10 and increasing mechanical life, as described above.

The measured VOC output when the PTFE (10) cylinder of the LLS-TENG (100) was operated at 100 rpm is shown in Figures 10a and 10b. Attached electrodes are connected as in stand-alone TENG. As shown in FIG. 10A , the LLS-TENG 100 generates a peak voltage output in the range of 100 to 200V. The magnified voltage output is shown in Figure 10b. It can be seen that a unique shape peak can be observed because direct electron flow occurs due to the contact between the rolling electrode 20 and the plate electrode 30 .

Examining the voltage, current, and power output according to various external load resistances to clarify the electrical output characteristics, Fig. 11a shows the instantaneous peak voltage, current, and power when the external load resistance changes from 10Ω to 1GΩ. At this time, the input rotation is 100rpm. As the external load resistance increases from 10Ω to 1kΩ, the instantaneous voltage output does not change significantly. However, as the external resistance increases from 1kΩ to 1MΩ, the voltage output increases. Also, as the external resistance increases from 1MΩ to 100MΩ, the voltage output gradually decreases. The highest current output occurs at 10Ω and the output continues to decrease as the external resistance further increases.

According to this result, the LLS-TENG 100 can generate an instantaneous power of about 0.6W when the external resistance is 1MΩ. A continuous electrical output is a key factor in the application of TENGs to existing electronic devices. In an embodiment of the present invention RMS is considered to determine the average power generated by the LLS-TENG 100 . RMS voltage (VRMS) and RMS current (IRMS) are calculated as follows.

[Equation 3]

Here, V(t) and I(t) represent voltage and current with time, respectively. Voltage and current results are measured from T ₁ to T ₂ . The RMS power (WRMS) is determined as the product of VRMS and IRMS.

The RMS results obtained when the LLS-TENG 100 was rotated at 100 rpm are shown in FIG. 11B . VRMS does not change significantly when the external load resistance increases from 10Ω to 1MΩ. However, VRMS increases as the external load resistance increases from 10MΩ to 1GΩ. The highest VRMS is 7.96V when the external load resistance is 1GΩ.

Conversely, IRMS decreases as the external load resistance increases. The highest IRMS is 1.49mA with an external load resistance of 10Ω. WRMS decreases as the external load resistance increases from 1 to 100 MΩ and the resistance increases to 1 GΩ. The highest WRMS is 1.73mW with an external resistance of 100MΩ. The instantaneous and RMS power results show that the LLS-TENG 100 can be used as an energy source in practical applications.

12A and 12B are a photograph (FIG. 12A) and a rectifier circuit (FIG. 12B) of an LLS-TENG manufactured according to an embodiment of the present invention, and FIGS. 13A and 13B are in series (FIG. 13A) and in parallel (FIG. 13B). Circuit configuration and photo of the connected 319 LED, FIG. 14 is a graph of rectified voltage and current of LLS-TENG according to an embodiment of the present invention, and FIG. 15 is a commercial LLS-TENG charging 100, 200 and 300 μF capacitor according to an embodiment of the present invention , FIG. 16 shows a charging graph of an LLS-TENG commercial lithium-ion battery according to an embodiment of the present invention.

In the fabrication of the LLS-TENG according to the embodiment of the present invention, the LLS-TENG 100 is an aluminum rolling electrode that rolls between the outer cylinder 1, the inner cylinder 2, the outer cylinder 1 and the inner cylinder 2 (20), was composed of a jig (3) for fixing the aluminum rolling electrode (20).

The outer cylinder 1 made of PMMA has a height and diameter of 100 mm and 70 mm, respectively. Four plate electrodes 30 are attached to the inner surface of the outer cylinder 1 . Four 100 mm × 40 mm commercial aluminum tapes with a thickness of 0.05 mm (Duksung Hitech Co., Ltd.) were used as plate electrodes 30 . A commercial Teflon wrapping wire (AWG 24) is also attached to the plate electrode 30 .

Also, the inner cylinder (2) made of PMMA has a height and diameter of 100 mm and 40 mm respectively. The outer surface of the inner cylinder (2) is covered with several layers of 0.13 mm thick PTFE (10) tape. Six aluminum rolling electrodes 20 are provided between the inner cylinder 2 and the outer cylinder 1 . The jig 3 is used to ensure a constant distance between the aluminum rolling electrodes 20 .

In the experimental example of the present invention, the measurement of voltage and current was measured using a mixed domain oscilloscope (MDO 3015, Tektronix Co.), a current probe (TCP0030A, Tektronix Co.), and a digital multimeter (Fluke 289, FLUKE Co.). became Magnified pictures were obtained using an optical microscope (BX53M, Olympus).

As shown in FIG. 12A , it can be seen that the LLS-TENG 100 has four plate electrodes 30 attached to the inner surface of the PMMA outer cylinder 1 . Each plate electrode 30 is connected to the middle region of two fast switching diodes, as shown in Fig. 12b, for output rectification.

With its high electrical output, the LLS-TENG 100 can power 319 LEDs connected in series and parallel. 13A and 13B show the circuit configuration of 319 LEDs connected in series and parallel, respectively, and corresponding pictures of the LEDs lit when the LLS-TENG 100 is operating.

14 shows the rectified voltage and current output of the LLS-TENG. The output was measured at 100 rpm of input rotation. It can be seen that the peak voltage and current outputs are 220V and 171mA, respectively. The LLS-TENG 100 can produce a high current output but must ensure energy storage for use in commercial products.

15 shows graphs of 100, 200 and 300 μF capacitors charged using LLS-TENG 100 . In particular, it can be seen that the LLS-TENG 100 can charge the 100, 200, and 300 μF capacitors to 3.28, 1.72, and 1.04 V within 200 seconds, respectively.

In addition, the LLS-TENG 100 can charge a commercial lithium-ion battery (LIB) through a battery charging circuit including a capacitor. The battery charging circuit stores charge in the device as a capacitor and transfers this charge to the battery to enable stable charging. 16 shows a charge plot of a 3V, 2mAh LIB battery connected to an LLS-TENG(100). It can be seen that the battery charges from 2.737V to 2.763V in 4 hours. This result shows that the LLS-TENG 100 can be used as an auxiliary power source for charging commercial batteries.

In the embodiment of the present invention, the use of a TENG filled with a liquid lubricant 40 is demonstrated to improve the electrical and mechanical properties of the existing TENG.

The surface charge of PTFE (10) can be enhanced by liquid lubricant (40) through air breakage and suppression of field emission. Non-polar liquid lubricants 40 such as mineral oil and silicone oil can improve the electrical output of the TENG due to the long Debye length.

In addition, the rolling electrode 20 of the LLS-TENG 100 can reduce friction during operation and increase the electrical output by inducing a direct electron flow between the electrodes. At an input rotation of 100 rpm, the LLS-TENG 100 can generate VOC and ICC of up to 220V and 171mA, respectively. The instantaneous and RMS powers of the LLS-TENG 100 during operation are 0.6W and 1.73mW, respectively. With this high current output, it was found that the LLS-TENG 100 can successfully power 319 LEDs connected in series and parallel.

In addition, the LLS-TENG 100 can charge commercial capacitors and LIBs. Therefore, it was demonstrated that the mechanism according to the embodiment of the present invention can expand the applicability of the TENG by overcoming the electrical and mechanical limitations and facilitating the use of the LLS-TENG 100 as an auxiliary power source.

In addition, in the apparatus and method described above, the configuration and method of the above-described embodiments are not limitedly applicable, but all or part of each embodiment is selectively combined so that various modifications can be made to the embodiments. may be configured.

1: External cylinder
2: Inner cylinder
3: Jig
10: dielectric layer, PTFE
20: rolling electrode
30: plate electrode
40: non-polar liquid lubricant
100: Tribological electrification nanogenerator (LLS-TENG) with liquid lubricant for current amplification through direct electron flow

Claims (10)

In the triboelectric nanogenerator,
an inner cylinder having a dielectric;
at least one plate electrode surrounding the inner cylinder to be spaced apart from the outer surface;
a plurality of rolling electrodes positioned in contact between the plate electrode and the inner cylinder; and
A triboelectric charging nanogenerator having a liquid lubricant for current amplification through direct electron flow, characterized in that it comprises a; liquid lubricant filled in the space between the plate electrode and the inner cylinder.
The method of claim 1,
The liquid lubricant is a triboelectric charging nanogenerator having a liquid lubricant for current amplification through direct electron flow, characterized in that the non-polar liquid lubricant.
3. The method of claim 2,
A triboelectric charging nanogenerator having a liquid lubricant for current amplification through direct electron flow, characterized in that the dielectric layer is laminated at least once on the outer surface of the inner cylinder.
4. The method of claim 3,
The dielectric layer is a triboelectric nanogenerator having a liquid lubricant for current amplification through direct electron flow, characterized in that PTFE.
3. The method of claim 2,
It further comprises an external cylinder positioned to be spaced apart from the internal cylinder at a specific distance, wherein the plate electrode is coupled to the inner surface of the external cylinder,
The rolling electrode is configured in the form of a rod, and is installed in each of the front and rear sides of the outer cylinder, and a jig for fixing the longitudinal and diametrical movement positions of the plurality of rolling electrodes; direct electron flow, characterized in that it further comprises A triboelectric nanogenerator with liquid lubricant for current amplification through
The method of claim 1,
The rolling electrode and the plate electrode are made of aluminum, and a Teflon wrapping wire is attached to the plate electrode.
6. The method of claim 5,
The inner cylinder, the outer cylinder, and the jig have a liquid lubricant for current amplification through direct electron flow composed of PMMA.
3. The method of claim 2,
The non-polar liquid lubricant comprises at least one of mineral oil and silicone oil.
3. The method of claim 2,
Direct electron, characterized in that the surface charge of the dielectric layer is suppressed by air destruction and electric field emission by the non-polar liquid lubricant, reduces the operating friction of the rolling electrode, and induces a direct electron flow between the rolling electrode and the plate electrode A triboelectric nanogenerator with liquid lubricant for current amplification through flow.
In the operating method of the triboelectric nanogenerator according to any one of claims 1 to 9,
Rotating the inner cylinder by the external input energy and rotating the rolling electrode interlockingly;
charging the dielectric layer on the outer surface of the inner cylinder to be negatively charged;
inducing a positive charge to the rolling electrode in contact with the dielectric layer and causing polarization; and
When the rolling electrode is in contact with the plate electrode, the electrons accumulated in the rolling electrode directly flow to the plate electrode; triboelectric charging nano generator having a liquid lubricant for current amplification through direct electron flow, characterized in that it comprises a How it works.

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