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rGO-PEI/PVDF pyroelectric film and preparation method thereof

A pyroelectric and thin film technology, applied in thermoelectric devices, chemical instruments and methods, thermoelectric devices with thermal changes in dielectric constant, etc., can solve the problems of uncommon, low output power, etc. Effect

Active Publication Date: 2020-06-23
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, although S-PENG is a new technology for utilizing sunlight, its output power is very low (2 ), so it is not common in practical applications

Method used

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  • rGO-PEI/PVDF pyroelectric film and preparation method thereof
  • rGO-PEI/PVDF pyroelectric film and preparation method thereof
  • rGO-PEI/PVDF pyroelectric film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] A preparation method of a self-powered bracelet based on rGO-PEI / PVDF pyroelectric film, comprising the following steps:

[0037] 1) PEI was used as a modifier to chemically modify GO to prepare rGO-PEI photothermal materials. The specific operation was as follows: weigh 0.1g of GO powder and ultrasonically disperse it in 100mL deionized water, and then add 0.2g Stir KOH and 3g PEI for 30 minutes until dissolved, put the mixed solution in an oil bath at 80°C and stir for 10 hours, and finally wash the reacted solution by centrifugation for 3-4 times, and freeze-dry;

[0038] 2) Disperse rGO-PEI in ethanol solution, then form a layer of rGO-PEI layer on filter paper by suction filtration and dry at room temperature to obtain rGO-PEI photothermal layer. The specific operation is: rGO-PEI Disperse evenly in 6mL of ethanol solution, and drop evenly on the surface of the filter paper to ensure that the surface density of the material is 1mg / cm 2 , carry out suction filtrati...

Embodiment 2

[0043] During outdoor sports, the self-powered bracelet based on rGO-PEI / PVDF pyroelectric film obtained in Example 1 is worn on the wrist, and the heat generated by sunlight can be converted into pyroelectric by means of the swing of the wrist when the human body walks. Electrode output, bridge rectification and capacitor storage for timely power supply to human health monitors. Experiments have shown that walking for an hour in the presence of sunlight can charge about 10% of the electricity for a human health monitor. Its applications are as follows: image 3 shown.

Embodiment 3

[0045] When a person walks at night, wear the self-powered wristband based on rGO-PEI / PVDF pyroelectric film obtained in Example 1 on the wrist. The movement of the wrist will cause the air temperature to fluctuate, thereby generating pyroelectricity, which is output by electrodes and rectified. Bridge rectification and capacitor storage, which can be used to harvest energy from the night air, where a person's walking time versus the resulting current is plotted as Figure 4 shown.

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Abstract

The invention belongs to the technical field of energy conversion devices, and provides an rGO-PEI / PVDF pyroelectric film, a preparation method of the film and a self-powered wristband based on the film. The polyethyleneimine (PEI) modified reduced graphene oxide (rGO-PEI) is adopted as a photothermal conversion material, a silver-plated polarized polyvinylidene fluoride (PVDF) film is adopted asa pyroelectric conversion material, the rGO-PEI photothermal material is fixed to the surface of PVDF through a transparent film layer, and the self-powered wristband is prepared based on the rGO-PEIphotothermal material. The obtained wristband has the output power as high as 21.3 mW / m<2>, no extra mechanical device is needed for regulating and controlling the temperature during work, and thermoelectric conversion, rectification, storage and application are achieved through outdoor exercise sunlight absorption, air flow temperature difference, temperature fluctuation generated by hand wavingaction, human sweat evaporation and the like. The preparation process is extremely simple, the cost is low, and large-scale production can be realized.

Description

technical field [0001] The invention generally relates to the technical field of energy conversion devices, in particular to an rGO-PEI / PVDF pyroelectric film and a preparation method thereof. Background technique [0002] Emerging power generation technologies (piezoelectric nanogenerators, triboelectric nanogenerators, and pyroelectric nanogenerators, etc.) are an important way to solve the energy crisis. Compared with piezoelectric nanogenerators and triboelectric nanogenerators, pyroelectric nanogenerators (PENGs) have unique advantages because they can convert waste heat fluctuating in the environment into valuable electrical energy. [0003] Among various PENGs, the solar-heat-harvesting pyroelectric nanogenerator (S-PENG) is a technology for non-contact energy harvesting. This S-PENG realizes the conversion of fluctuating photothermal energy to pyroelectricity by using green and continuous sunlight as a heat source for temperature changes. However, the temperature f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B27/30B32B7/12B32B37/12A44C5/00H10N15/10
CPCB32B9/007B32B9/045B32B27/304B32B7/12B32B37/1284A44C5/0007B32B2250/24B32B2307/20H10N15/10G01J5/34B32B2313/04B32B37/025B32B2311/04B32B2255/205B32B2264/102B32B2457/00B32B2037/246H10N15/15B32B2264/108B32B38/162B32B38/164B32B2327/12B32B2379/00B32B38/18
Inventor 张以河李海涛安琪佟望舒
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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