CN113823510A - Fiber dye-sensitized solar cell with high photoelectric conversion efficiency and preparation method thereof - Google Patents
Fiber dye-sensitized solar cell with high photoelectric conversion efficiency and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
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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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/542—Dye sensitized solar cells
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Abstract
The invention belongs to the technical field of photovoltaics, and particularly relates to a fiber dye-sensitized solar cell with high photoelectric conversion efficiency and a preparation method thereof. The solar cell of the present invention includes: titanium wire; a titanium dioxide nanotube array growing on the surface of the titanium wire along the vertical direction; titanium dioxide nanoparticles filled in the gaps of the titanium dioxide nanotubes; dye molecule N719 fully adsorbed by the titanium dioxide nanotube and the titanium dioxide nanoparticle forms a photo-anode; the photo-anode is wound with carbon nanotube fiber as counter electrode, the two electrodes are placed in a flexible transparent plastic tube filled with I‑/I3 ‑An electrolyte as a redox couple; the invention solves the problem that the photoanode of the traditional fiber dye-sensitized solar cell cannot have high dye load density simultaneouslyAnd short electron transport paths in the titanium dioxide layer, and improves the performance of the solar cell in an indoor light environment, so that the photoelectric conversion efficiency exceeds 20%.
Description
Technical Field
The invention belongs to the technical field of photovoltaics, and particularly relates to a fiber dye-sensitized solar cell with high photoelectric conversion efficiency in an indoor light environment and a preparation method thereof.
Background
With the development of flexible electronics, the limitations of appearance design and function integration of wearable electronic devices are gradually broken, and the appearance of more and more wearable electronic devices with functions of information processing, remote communication, health monitoring and the like improves the quality of life of consumers. The realization of these functions requires the matching of suitable energy supply modules. The fiber solar cell can convert light energy which is widely existed in the environment into electric energy, has flexibility, can adapt to complex deformation, and has wide application prospect in the field of wearable electronics. Fiber solar cells currently used in standard solar environments have been extensively studied. Compared to outdoors, standing indoors is a state of considerable importance and duration in modern life. Therefore, research on fiber solar cells suitable for indoor light environments is also urgently needed. The dye-sensitized solar cell has the advantages that the photovoltage of the dye-sensitized solar cell is insensitive to the change of light intensity, the dye-sensitized solar cell also has higher photovoltage in a weaker indoor light environment, and theoretically can have higher photoelectric conversion efficiency, which can be seen from research results reported by Freutag et al (Nature Photonics, 2017,11, 372-378) and Cao et al (Joule, 2018, 2, 1108-1117), however, the fiber dye-sensitized solar cell developed at present has some problems, and the structure of the nanotube array of the titanium dioxide layer of the photoanode or the accumulated nanoparticles and the electrolyte with high iodine concentration cannot simultaneously meet the very important requirements of high external quantum efficiency and effective inhibition of carrier recombination under the indoor light condition, so that the photoelectric conversion efficiency of the device is greatly limited. Therefore, there is an urgent need to develop a fiber dye-sensitized solar cell capable of achieving high external quantum efficiency and effectively suppressing carrier recombination, while the prior art has not yet made the photoelectric conversion efficiency of the fiber solar cell exceed 20% in an indoor light environment.
Disclosure of Invention
The invention aims to provide a fiber dye-sensitized solar cell with photoelectric conversion efficiency of more than 20% in an indoor light environment and a preparation method thereof.
The invention provides a fiber dye-sensitized solar cell with photoelectric conversion efficiency more than 20% in an indoor light environment, which comprises: a titanium wire as a substrate; a titanium dioxide nanotube array growing on the surface of the titanium wire along the vertical direction; titanium dioxide nanoparticles uniformly filled in the gaps of the titanium dioxide nanotubes; dye molecule N719 fully adsorbed by the titanium dioxide nanotube and the titanium dioxide nanoparticle, thereby constituting a photoanode; the photo-anode is wound with carbon nanotube fiber as counter electrode, the two electrodes are placed in a flexible transparent plastic tube filled with I-/I3 -As an electrolyte for the redox couple.
Specifically, a titanium dioxide nanotube array vertically grows on a titanium wire substrate along the surface, then titanium dioxide nanoparticles are filled in gaps of the nanotubes, the titanium dioxide nanotubes and the nanoparticles adsorb dye molecules N719 to obtain a photo-anode, then counter electrode carbon nanotube fibers are wound outside, two electrodes are arranged in a flexible transparent plastic tube, then electrolyte with low iodine concentration is injected into the tube, and the mouth of the tube is sealed by hot melt adhesive, so that the fiber dye-sensitized solar cell is obtained.
The invention provides a preparation method of a fiber dye-sensitized solar cell with photoelectric conversion efficiency more than 20% in an indoor light environment, which comprises the following steps:
(1) ultrasonically cleaning a titanium wire by using acetone, isopropanol and deionized water in sequence, drying, growing a titanium dioxide nanotube array on the surface of the titanium wire by using an anodic oxidation method, and then annealing at high temperature;
(2) mixing ethanol and titanium dioxide nanoparticles, performing ultrasonic dispersion to obtain ethanol dispersion of the titanium dioxide nanoparticles, immersing the titanium wires on which the titanium dioxide nanotube arrays grow into the dispersion, then pulling out the titanium wires at a certain speed, and repeatedly immersing and pulling out the titanium wires for several times (such as 1-6 times) to fill gaps of the titanium dioxide nanotubes with the titanium dioxide nanoparticles; drying at room temperature; then annealing at high temperature to obtain the photo-anode fiber; then soaking the fabric in N719 dye solution;
(3) taking out the photo-anode fiber soaked in the dye solution, winding the carbon nanotube fiber on the photo-anode fiber, placing the fiber in a flexible transparent plastic tube, and reserving proper lengths of the two electrodes outside the tube; and injecting electrolyte, and plugging the pipe orifice with hot melt adhesive to obtain the required fiber dye-sensitized solar cell.
Further, in the present invention:
the electrolyte specifically comprises iodine, lithium iodide, 1, 2-dimethyl-3-propyl imidazolium iodide, 4-tert-butylpyridine and a solvent, wherein the concentration of the iodine is 0.002M-0.02M, the concentration of the lithium iodide is 0.02M-0.5M, the concentration of the 1, 2-dimethyl-3-propyl imidazolium iodide is 0.1M-1M, and the concentration of the 4-tert-butylpyridine is 0.2M-1.5M; the solvent is one or a mixture of acetonitrile, propionitrile, butyronitrile, valeronitrile, glutaronitrile and 3-methoxypropionitrile.
The diameter of the titanium wire is 0.1 mm-1 mm.
The titanium dioxide nanotube has a length of 10-40 μm, an outer diameter of 120-360 nm, an inner diameter of 80-300 nm, and a tube wall thickness of 10-60 nm.
The particle size of the titanium dioxide nanoparticles is 5 nm-60 nm, and the linear density of the titanium dioxide nanoparticle load is 4 mg/m-20 mg/m.
The diameter of the carbon nano tube fiber is 20-500 mu m, and the outer diameter of the carbon nano tube is 5-30 nm.
The flexible transparent plastic pipe material is one of polyethylene or a copolymer of ethylene and other monomers, polytetrafluoroethylene, fluorinated ethylene propylene copolymer and polycarbonate, the inner diameter of the plastic pipe is 0.4 mm-2 mm, and the wall thickness of the plastic pipe is 0.2 mm-1 mm.
Further, the titanium dioxide nanotube array grows on the surface of the titanium wire by the anodic oxidation method in the step (1), wherein the anodic oxidation electrolyte takes ethylene glycol as a solvent, contains 5-10% of water by mass and 0.1-0.5% of ammonium fluoride by mass, the anodic oxidation voltage is 40-80V, the temperature is 20-60 ℃, the length of the grown titanium dioxide nanotube is 10-40 μm, the outer diameter is 120-360 nm, the inner diameter is 80-300 nm, the wall thickness of the tube is 10-60 nm, and the high-temperature annealing and the annealing procedure is as follows: raising the temperature from room temperature to 450-550 ℃ at a heating rate of 3-16 ℃/min, and then keeping the constant temperature for 0.5-5 h.
Further, in the step (2), the mass fraction of the titanium dioxide nanoparticles in the ethanol dispersion of the titanium dioxide nanoparticles is 30-60%; the speed of pulling the titanium wire with the titanium dioxide nanotube array out of the dispersion liquid is 10-500 cm/min; the linear density of titanium dioxide nano particles loaded by filling the titanium dioxide nano tubes is 2 mg/m-20 mg/m; the procedure of high-temperature annealing is as follows: raising the temperature from room temperature to 450-550 ℃ at a heating rate of 3-16 ℃/min, and then keeping the constant temperature for 0.5-5 h. The N719 dye solution takes a mixture of acetonitrile and tert-butyl alcohol as a solvent, wherein the volume fraction of the acetonitrile is 30-70%, and the concentration of the N719 is 0.1-0.5 mM; the soaking time of the photo-anode fiber in the N719 dye solution is more than 12 h.
Further, in the step (3), the carbon nanotube fiber is wound on the photo-anode fiber, and the winding pitch is greater than 2 mm. For example, the thickness may be 2mm to 25 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the traditional nano tube structure photo anode, the nano tube/nano particle composite structure photo anode has high dye loading density, so that high external quantum efficiency is caused; compared with another traditional nano-particle structured photo-anode, the nano-particle structured photo-anode has a vertical tubular structure, shortens an electron transmission path, and can effectively inhibit the recombination of carriers;
(2) compared with the traditional electrolyte with high iodine concentration, the electrolyte with low iodine concentration is used, and the concentration of photon-generated carriers caused by the intensity of indoor light is low, so that the absorption of the electrolyte to incident light can be reduced on the premise of ensuring efficient charge transmission, and the capture and conversion of the photo-anode to the incident light can be improved. Finally, the fiber dye-sensitized solar cell has high photoelectric conversion efficiency in an indoor light environment, and the photoelectric conversion efficiency reaches more than 20%.
The invention solves the problem that the light anode of the traditional fiber dye-sensitized solar cell cannot simultaneously have high dye load density and short transmission path of electrons in a titanium dioxide layer, reduces the concentration of iodine in electrolyte aiming at the characteristic of weak indoor light intensity, and improves the performance of the fiber dye-sensitized solar cell in an indoor light environment.
Drawings
Fig. 1 is a schematic view showing a structure of a fiber dye-sensitized solar cell having a photoelectric conversion efficiency of more than 20% in an indoor light environment according to the present invention, and fig. 1 is a schematic view showing a structure of a photo-anode in the solar cell.
Fig. 2 is a Scanning Electron Microscope (SEM) photograph of the microstructure of the fiber dye-sensitized solar cell having a photoelectric conversion efficiency of more than 20% in an indoor light environment, prepared in example 1 of the present invention. The SEM photographs of the titanium wire in which the titanium dioxide nanotube array was vertically grown, (b) the SEM photograph of the titanium dioxide nanotube array, (c) the SEM photograph of the composite structured photoanode formed after the titanium dioxide nanoparticles filled the gaps between the titanium dioxide nanotubes, (d) the SEM photograph of the titanium dioxide nanotube array filled with the titanium dioxide nanoparticles, and (e) the SEM photograph of the composite structured photoanode in which the counter electrode carbon nanotube fiber was wound around the outer layer.
FIG. 3 is a photograph of an electrolyte solution of the present invention with different iodine concentrations and a transmittance spectrum. Wherein, (a) is a real photograph of electrolyte with different iodine concentrations including electrolyte with high iodine concentration and electrolyte with low iodine concentration, and (b) is a transmittance spectrum of the electrolyte with different iodine concentrations in the range of 350 nm-800 nm.
Fig. 4 is a photograph of a fiber dye-sensitized solar cell having a photoelectric conversion efficiency of more than 20% in an indoor light environment, prepared in example 1 of the present invention.
Fig. 5 is a current density-voltage relationship curve of the fiber dye-sensitized solar cell having a photoelectric conversion efficiency of more than 20% in an indoor light environment, which is prepared in example 1, in a light environment in which the illuminance of a warm fluorescent lamp is 1500 lux.
Fig. 6 is a current density-voltage relationship curve of the fiber dye-sensitized solar cell having a photoelectric conversion efficiency of more than 20% in an indoor light environment, prepared in example 2, in a light environment in which an illuminance of a warm fluorescent lamp is 1000 lux.
Detailed Description
The invention relates to a fiber dye-sensitized solar cell with photoelectric conversion efficiency exceeding 20% in an indoor light environment, which takes a titanium wire (1) as a substrate, vertically grows a titanium dioxide nanotube array (2.1) on the surface of the titanium wire, uniformly fills titanium dioxide nanoparticles (2.2) in gaps of the titanium dioxide nanotubes, enables the titanium dioxide nanotubes and the titanium dioxide nanoparticles to fully adsorb dye molecules N719 as a photo-anode, winds counter electrode carbon nanotube fibers (3) outside the photo-anode, places two electrodes in a flexible transparent plastic tube (4), and is injected with I-/I3 -An electrolyte (5) as a redox couple.
The diameter of the titanium wire is 0.1 mm-1 mm.
The titanium dioxide nanotube has a length of 10-40 μm, an outer diameter of 120-360 nm, an inner diameter of 80-300 nm, and a tube wall thickness of 10-60 nm.
The particle size of the titanium dioxide nanoparticles is 5 nm-60 nm, and the linear density of the titanium dioxide nanoparticle load is 4 mg/m-20 mg/m.
The diameter of the carbon nano tube fiber is 20-500 mu m, and the outer diameter of the carbon nano tube is 5-30 nm.
The flexible transparent plastic pipe material is one of polyethylene or a copolymer of ethylene and other monomers, polytetrafluoroethylene, fluorinated ethylene propylene copolymer and polycarbonate, the inner diameter of the plastic pipe is 0.4 mm-2 mm, and the wall thickness of the plastic pipe is 0.2 mm-1 mm.
The solvent of the electrolyte is one or a mixture of more of acetonitrile, propionitrile, butyronitrile, valeronitrile, glutaronitrile and 3-methoxypropionitrile, wherein the concentration of iodine is 0.002M-0.02M, the concentration of lithium iodide is 0.02M-0.5M, the concentration of 1, 2-dimethyl-3-propyl imidazolium iodide is 0.1M-1M, and the concentration of 4-tert-butylpyridine is 0.2M-1.5M.
The method for manufacturing the fiber dye-sensitized solar cell comprises the following steps:
step 1, ultrasonically cleaning a titanium wire by using acetone, isopropanol and deionized water in sequence, drying, growing a titanium dioxide nanotube array on the surface of the titanium wire by an anodic oxidation method, and then annealing at high temperature;
the anodic oxidation electrolyte takes ethylene glycol as a solvent, and comprises 5-10% of water and 0.1-0.5% of ammonium fluoride by mass, wherein the anodic oxidation voltage is 40-80V, the temperature is 20-60 ℃, the length of the grown titanium dioxide nanotube is 10-40 μm, the outer diameter is 120-360 nm, the inner diameter is 80-300 nm, and the wall thickness of the nanotube is 10-60 nm. The annealing procedure is that the temperature is increased from room temperature to 450-550 ℃, the temperature increasing rate is 3-16 ℃/min, and then the constant temperature is kept for 0.5-5 h;
step 2, mixing ethanol and titanium dioxide nanoparticles, obtaining an ethanol dispersion liquid of the titanium dioxide nanoparticles through ultrasonic dispersion, immersing the titanium wires on which the titanium dioxide nanotube arrays grow into the dispersion liquid, then pulling out, repeatedly immersing and pulling out for a plurality of times, filling gaps of the titanium dioxide nanotubes with the titanium dioxide nanoparticles, drying at room temperature, annealing at high temperature, and then immersing in an N719 dye solution;
the mass fraction of titanium dioxide nanoparticles in the dispersion liquid is 30-60%, the pulling-out speed is 10-500 cm/min, the repeated immersion and pulling times are 1-5 times, and the linear density of the loaded titanium dioxide nanoparticles is 2-20 mg/m. The annealing procedure is to heat the temperature from room temperature to 450-550 ℃, the heating rate is 3-16 ℃/min, and then the constant temperature is kept for 0.5-5 h. The N719 dye solution takes a mixture of acetonitrile and tert-butyl alcohol as a solvent, wherein the volume fraction of the acetonitrile is 30-70%, the concentration of the N719 is 0.1-0.5 mM, and the soaking time is more than 12 h;
step 3, taking out the photo-anode fiber soaked in the dye solution, winding the carbon nanotube fiber on the photo-anode fiber, placing the photo-anode fiber in a flexible transparent plastic tube, reserving a proper length of the two electrodes outside the tube, injecting electrolyte, and plugging the tube orifice with hot melt adhesive to complete the manufacture of the device;
the winding pitch of the carbon nano tube fiber is larger than 2 mm.
Compared with the traditional nano-tube structured photo-anode, the nano-tube/nano-particle composite structured photo-anode has high dye loading density, resulting in high external quantum efficiency, and compared with another traditional nano-particle structured photo-anode, the nano-tube/nano-particle composite structured photo-anode has a vertical tubular structure, shortens an electron transmission path, and can effectively inhibit the recombination of carriers; compared with the traditional electrolyte with high iodine concentration, the electrolyte with low iodine concentration is used, and the concentration of photon-generated carriers is low due to the indoor light intensity, so that the absorption of the electrolyte to incident light is reduced on the premise of ensuring the efficient charge transmission, and the capture and conversion of the photo-anode to the incident light are improved. Therefore, the fiber dye-sensitized solar cell can have a photoelectric conversion efficiency of more than 20% in an indoor light environment.
The present invention will be described in further detail with reference to examples.
Example 1
Referring to fig. 1, the present embodiment is a fiber dye-sensitized solar cell having a photoelectric conversion efficiency of more than 20% in an indoor light environment, and has the following structure: the method comprises the steps of taking a titanium wire as a substrate, vertically growing a titanium dioxide nanotube array on the substrate, uniformly filling titanium dioxide nanoparticles in gaps of the titanium dioxide nanotubes, fully adsorbing dye molecules N719 by the titanium dioxide nanotubes and the titanium dioxide nanoparticles to serve as a photo-anode, winding counter electrode carbon nanotube fibers outside the photo-anode, placing the two electrodes in a flexible transparent plastic tube, and injecting I into the tube-/I3 -As an electrolyte for the redox couple.
The preparation method of the fiber dye-sensitized solar cell comprises the following specific steps:
(1) taking a titanium wire with the diameter of 0.127mm, ultrasonically cleaning the titanium wire by using acetone, isopropanol and deionized water in sequence, and drying. And then growing a titanium dioxide nanotube array on the surface of the titanium wire by an anodic oxidation method, wherein the electrolyte for anodic oxidation is a glycol solution containing 8 mass percent of water and 0.3 mass percent of ammonium fluoride, the anodic oxidation temperature is 40 ℃, the voltage is 60V, and the length of the grown titanium dioxide nanotube is 22 μm. Then carrying out high-temperature annealing treatment, wherein the annealing procedure is to heat the room temperature to 500 ℃, the heating rate is 8.3 ℃/min, and then keeping the constant temperature for 1 h;
(2) mixing ethanol and titanium dioxide nanoparticles, wherein the mass fraction of the titanium dioxide nanoparticles is 35%, obtaining an ethanol dispersion liquid of the titanium dioxide nanoparticles through ultrasonic dispersion, immersing a titanium wire on which a titanium dioxide nanotube array grows into the dispersion liquid, then pulling out the titanium wire at the speed of 20cm/min, repeatedly immersing and pulling out for 1 time, filling gaps of the titanium dioxide nanotubes with the titanium dioxide nanoparticles, drying the loaded titanium dioxide nanoparticles at the room temperature of 7.7mg/m, carrying out high-temperature annealing treatment, wherein the annealing procedure is that the room temperature is increased to 500 ℃, the temperature increase rate is 8.3 ℃/min, and then keeping the constant temperature for 1 h. Then soaking in N719 dye solution, wherein the dye solution takes a mixture of acetonitrile and tert-butyl alcohol as a solvent, the volume fraction of acetonitrile is 50%, the concentration of N719 is 0.2mM, and the soaking time is 24 h;
(3) taking out the photo-anode fiber soaked in the dye solution, winding the carbon nano tube fiber with the diameter of 50 mu M on the photo-anode fiber, wherein the winding pitch is 1cm, placing the fiber in an ethylene-vinyl acetate copolymer (EVA) tube with the inner diameter of 0.6mm and the wall thickness of 0.2mm, reserving a proper length of the two electrodes outside the tube, injecting electrolyte, wherein the solvent of the electrolyte is acetonitrile, the concentration of iodine is 0.00625M, the concentration of lithium iodide is 0.1M, the concentration of 1, 2-dimethyl-3-propyl imidazolium iodide is 0.6M, and the concentration of 4-tert-butylpyridine is 1M. And (5) plugging the pipe orifice by using hot melt adhesive, and finishing the manufacture of the device.
The microstructure of the fiber dye-sensitized solar cell prepared in the embodiment is shown in fig. 2, the structure of the photo-anode is that a titanium dioxide nanotube array vertically grows on a titanium wire substrate, titanium dioxide nanoparticles are uniformly filled in gaps of the titanium dioxide nanotubes, and carbon nanotube fibers are wound outside the photo-anode.
As shown in FIG. 3, the electrolyte used in the method has a light color and weak light absorption, and has a transmittance of more than 60% in a wavelength range of more than 500 nm.
The prepared complete fiber dye-sensitized solar cell is shown in figure 4, two electrodes are arranged in a flexible transparent plastic tube, a proper length is reserved outside the tube to lead out the electrodes, electrolyte is injected into the tube, and the tube opening is blocked by hot melt adhesive. It has good flexibility and can be bent and coiled into a ring.
FIG. 5 is a graph showing the current density-voltage relationship of the fiber dye-sensitized solar cell prepared in this example in a light environment with an illuminance of 1500 lux for a warm-color fluorescent lamp, which corresponds to a higher illumination level in an actual indoor scene such as a production factory, and from which it can be read that the open-circuit voltage is 0.579V and the short-circuit current density is 248.4 μ A cm-2The filling factor is 0.691, the photoelectric conversion efficiency is 21.01%, which exceeds 20%, and the photoelectric conversion performance is excellent.
Example 2
Referring to fig. 1, the fiber dye-sensitized solar cell having a photoelectric conversion efficiency of more than 20% in an indoor light environment according to the present embodiment has the following structure: the method comprises the steps of taking a titanium wire as a substrate, vertically growing a titanium dioxide nanotube array on the substrate, uniformly filling titanium dioxide nanoparticles in gaps of the titanium dioxide nanotubes, fully adsorbing dye molecules N719 by the titanium dioxide nanotubes and the titanium dioxide nanoparticles to serve as a photo-anode, winding counter electrode carbon nanotube fibers outside the photo-anode, placing the two electrodes in a flexible transparent plastic tube, and injecting I into the tube-/I3 -As an electrolyte for the redox couple.
The preparation method of the fiber dye-sensitized solar cell comprises the following specific steps:
(1) taking a titanium wire with the diameter of 0.5mm, ultrasonically cleaning the titanium wire by using acetone, isopropanol and deionized water in sequence, and drying. And then growing a titanium dioxide nanotube array on the surface of the titanium wire by an anodic oxidation method, wherein the anodic oxidation electrolyte is a glycol solution containing 10 mass percent of water and 0.4 mass percent of ammonium fluoride, the anodic oxidation temperature is 20 ℃, the voltage is 70V, and the length of the grown titanium dioxide nanotube is 30 micrometers. Then carrying out high-temperature annealing treatment, wherein the annealing procedure is to heat the temperature from room temperature to 550 ℃, the heating rate is 4 ℃/min, and then keeping the constant temperature for 4 h;
(2) mixing ethanol and titanium dioxide nanoparticles, wherein the mass fraction of the titanium dioxide nanoparticles is 50%, obtaining an ethanol dispersion liquid of the titanium dioxide nanoparticles through ultrasonic dispersion, immersing a titanium wire on which a titanium dioxide nanotube array grows into the dispersion liquid, then pulling out the titanium wire at the speed of 200cm/min, filling gaps of the titanium dioxide nanotubes with the titanium dioxide nanoparticles, drying the loaded titanium dioxide nanoparticles at the room temperature of 15.7mg/m, carrying out high-temperature annealing treatment, wherein the annealing procedure is that the room temperature is increased to 550 ℃, the heating rate is 4 ℃/min, and then keeping the constant temperature for 4 h. Then soaking in N719 dye solution, wherein the dye solution takes a mixture of acetonitrile and tert-butyl alcohol as a solvent, the volume fraction of acetonitrile is 60%, the concentration of N719 is 0.4mM, and the soaking time is 96 h;
(3) and taking out the photoanode fiber soaked in the dye solution, winding the carbon nanotube fiber with the diameter of 200 microns on the photoanode fiber, wherein the winding pitch is 2.5cm, placing the photoanode fiber in a fluorinated ethylene propylene copolymer tube with the inner diameter of 0.8mm and the wall thickness of 0.4mm, keeping a proper length of the two electrodes outside the tube, injecting electrolyte, and the electrolyte adopts acetonitrile as a solvent, wherein the concentration of iodine is 0.003125M, the concentration of lithium iodide is 0.05M, the concentration of 1, 2-dimethyl-3-propyl imidazolium iodide is 0.3M, and the concentration of 4-tert-butylpyridine is 0.3M. And (5) plugging the pipe orifice by using hot melt adhesive, and finishing the manufacture of the device.
The current density-voltage relation curve of the fiber dye-sensitized solar cell prepared in the embodiment in the light environment with the illumination of the warm color fluorescent lamp of 1000 lux is shown in fig. 6, the illumination corresponds to the illumination level in the actual indoor scene such as a market, a supermarket and the like, the curve can be read, the open-circuit voltage is 0.564V, the short-circuit current density is 164.2 μ a cm & lt-2 & gt, the filling factor is 0.706, the photoelectric conversion efficiency is 20.70%, the photoelectric conversion efficiency is more than 20%, and the fiber dye-sensitized solar cell has excellent photoelectric conversion performance.
Claims (10)
1. A fiber dye-sensitized solar cell with high photoelectric conversion efficiency is characterized in thatIs characterized by comprising the following steps: a titanium wire as a substrate; a titanium dioxide nanotube array growing on the surface of the titanium wire along the vertical direction; titanium dioxide nanoparticles uniformly filled in the gaps of the titanium dioxide nanotubes; dye molecule N719 fully adsorbed by the titanium dioxide nanotube and the titanium dioxide nanoparticle, thereby constituting a photoanode; the photo-anode is wound with carbon nanotube fiber as counter electrode, the two electrodes are placed in a flexible transparent plastic tube filled with I-/I3 -An electrolyte as a redox couple; the fiber dye-sensitized solar cell has photoelectric conversion efficiency exceeding 20% in an indoor light environment.
2. The fiber dye-sensitized solar cell according to claim 1, characterized in that the titanium wire has a diameter of 0.1mm to 1 mm.
3. The fiber dye-sensitized solar cell according to claim 1, characterized in that the titanium dioxide nanotube has a length of 10 to 40 μm, an outer diameter of 120 to 360nm, an inner diameter of 80 to 300nm, and a tube wall thickness of 10 to 60 nm.
4. The fiber dye-sensitized solar cell according to claim 1, characterized in that the diameter of the titanium dioxide nanoparticles is 5nm to 60nm, and the linear density of the titanium dioxide nanoparticles loading is 4mg/m to 20 mg/m.
5. The fiber dye-sensitized solar cell according to claim 1, characterized in that the diameter of the carbon nanotube fiber is 20 to 500 μm and the outer diameter of the carbon nanotube is 5 to 30 nm.
6. The fiber dye-sensitized solar cell according to claim 1, wherein the flexible transparent plastic tube material is one of polyethylene or a copolymer of ethylene and other monomers, polytetrafluoroethylene, a fluorinated ethylene propylene copolymer and polycarbonate, the inner diameter of the plastic tube is 0.4mm to 2mm, and the wall thickness of the plastic tube is 0.2mm to 1 mm.
7. The fiber dye-sensitized solar cell according to claim 1, characterized in that the photo-anode is wrapped with carbon nanotube fiber carbon and the pitch of the wrapping is larger than 2 mm.
8. The fiber dye-sensitized solar cell according to claim 1, characterized in that the electrolyte comprises iodine, lithium iodide, 1, 2-dimethyl-3-propyl imidazolium iodide and 4-tert-butylpyridine and a solvent, wherein the solvent is one or a mixture of acetonitrile, propionitrile, butyronitrile, valeronitrile, glutaronitrile and 3-methoxypropionitrile; the concentration of iodine is 0.002M-0.02M, the concentration of lithium iodide is 0.02M-0.5M, the concentration of 1, 2-dimethyl-3-propyl imidazolium iodide is 0.1M-1M, and the concentration of 4-tert-butylpyridine is 0.2M-1.5M; the solvent is one or a mixture of acetonitrile, propionitrile, butyronitrile, valeronitrile, glutaronitrile and 3-methoxypropionitrile.
9. A method for preparing a fiber dye-sensitized solar cell according to any one of claims 1 to 8, characterized by comprising the following steps:
(1) ultrasonically cleaning a titanium wire by using acetone, isopropanol and deionized water in sequence, drying, growing a titanium dioxide nanotube array on the surface of the titanium wire by using an anodic oxidation method, and then annealing at high temperature;
(2) mixing ethanol and titanium dioxide nanoparticles, performing ultrasonic dispersion to obtain ethanol dispersion of the titanium dioxide nanoparticles, immersing a titanium wire on which a titanium dioxide nanotube array grows into the dispersion, then pulling out the titanium wire, and repeatedly immersing and pulling out the titanium wire for several times to fill gaps of the titanium dioxide nanotubes with the titanium dioxide nanoparticles; drying at room temperature; then annealing at high temperature to obtain the photo-anode fiber; then soaking the fabric in N719 dye solution;
(3) taking out the photo-anode fiber soaked in the dye solution, winding the carbon nanotube fiber on the photo-anode fiber, placing the fiber in a flexible transparent plastic tube, and reserving proper lengths of the two electrodes outside the tube; and injecting electrolyte, and plugging the pipe orifice with hot melt adhesive to obtain the required fiber dye-sensitized solar cell.
10. The preparation method of claim 9, wherein in the step (1), the anodic oxidation method grows a titanium dioxide nanotube array on the surface of the titanium wire, wherein the anodic oxidation electrolyte uses ethylene glycol as a solvent, contains 5% to 10% of water by mass and 0.1% to 0.5% of ammonium fluoride by mass, the anodic oxidation voltage is 40V to 80V, the temperature is 20 ℃ to 60 ℃, the length of the grown titanium dioxide nanotube is 10 μm to 40 μm, the outer diameter is 120nm to 360nm, the inner diameter is 80nm to 300nm, the wall thickness of the tube is 10nm to 60nm, and the high-temperature annealing procedure is as follows: raising the temperature from room temperature to 450-550 ℃ at a heating rate of 3-16 ℃/min, and then keeping the temperature for 0.5-5 h;
in the step (2), the mass fraction of the titanium dioxide nanoparticles in the ethanol dispersion liquid of the titanium dioxide nanoparticles is 30-60%; the speed of pulling the titanium wire with the titanium dioxide nanotube array out of the dispersion liquid is 10-500 cm/min; the linear density of titanium dioxide nano particles loaded by filling the titanium dioxide nano tubes is 2 mg/m-20 mg/m; the procedure of high-temperature annealing is as follows: raising the temperature from room temperature to 450-550 ℃ at a heating rate of 3-16 ℃/min, and then keeping the temperature for 0.5-5 h; the N719 dye solution takes a mixture of acetonitrile and tert-butyl alcohol as a solvent, wherein the volume fraction of the acetonitrile is 30-70%, and the concentration of the N719 is 0.1-0.5 mM; soaking the photoanode fiber in the N719 dye solution for more than 12 hours;
in the step (3), the carbon nanotube fiber is wound on the photo-anode fiber, and the winding pitch is larger than 2 mm.
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