CN115512972A - Preparation method of quasi-solid electrolyte for quantum dot sensitized solar cell - Google Patents
Preparation method of quasi-solid electrolyte for quantum dot sensitized solar cell Download PDFInfo
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- 239000002096 quantum dot Substances 0.000 title claims abstract description 37
- 239000007784 solid electrolyte Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003792 electrolyte Substances 0.000 claims abstract description 102
- 229920001021 polysulfide Polymers 0.000 claims abstract description 75
- 239000005077 polysulfide Substances 0.000 claims abstract description 75
- 150000008117 polysulfides Polymers 0.000 claims abstract description 75
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 40
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 40
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000003756 stirring Methods 0.000 claims abstract description 35
- 238000000227 grinding Methods 0.000 claims abstract description 32
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 24
- 238000001723 curing Methods 0.000 claims abstract description 24
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 24
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 24
- 239000011734 sodium Substances 0.000 claims description 22
- 239000004570 mortar (masonry) Substances 0.000 claims description 13
- 239000001103 potassium chloride Substances 0.000 claims description 12
- 235000011164 potassium chloride Nutrition 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 10
- 238000000354 decomposition reaction Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 6
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- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000009210 therapy by ultrasound Methods 0.000 description 4
- 235000007794 yellow potato Nutrition 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
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- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
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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
- H01G9/2004—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte
- H01G9/2009—Solid electrolytes
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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
- H01G9/0029—Processes of manufacture
- H01G9/0036—Formation of the solid electrolyte layer
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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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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- 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 provides a preparation method of a quasi-solid electrolyte for a quantum dot sensitized solar cell. The method is simple to operate, and the quasi-solid polysulfide electrolyte is obtained by uniformly grinding the curing agent (sodium carboxymethylcellulose and polyvinylpyrrolidone) and the polysulfide electrolyte for a few times. The grinding method adopted by the invention is innovative in the electrolyte preparation process, the existing quasi-solid polysulfide electrolyte preparation method is changed, the grinding process is firstly used for preparing the quasi-solid electrolyte, the grinding method is novel and unique, the prepared quasi-solid electrolyte is convenient to store, the problem that the common polysulfide electrolyte is easy to leak is solved, and the problems that the mixing of a curing agent and the electrolyte is not uniform and not thorough caused by stirring and curing are also solved. The preparation method is simple and efficient, ensures the same photovoltaic performance as that of the common polysulfide electrolyte, and has good application value.
Description
Technical Field
The invention relates to the technical field of novel solar cells and energy, in particular to a preparation method of a quasi-solid electrolyte for a quantum dot sensitized solar cell.
Background
With the development of modern science and technology, the energy crisis and the environmental pollution problem become more severe, and the development of renewable energy is an urgent and difficult task. At present, the renewable energy sources mainly comprise water power, wind power, tidal power, biological energy, solar energy and the like, wherein the solar energy is considered as the safest and cleanest renewable energy source due to the characteristics of no pollution and inexhaustibility, so the development of low-cost solar energy technology is an important approach for solving the energy environmental problem. Quantum dot sensitized solar cells (QDSCs), as a class of photovoltaic devices that are simple to fabricate and inexpensive, are considered to be one of the most promising third-generation solar cells. The cell has simple structure and is generally composed of a photo-anode (TiO) 2 、SnO 2 ZnO, etc.), sensitizer (quantum dot, etc.), electrolyte (Sn) 2- /S 2- 、((CH 3 ) 4 N) 2 S/((CH 3 ) 4 N) 2 Sn, etc.), and the counter electrode, and the whole structure is in a sandwich shape.
As an important component of the solar cell, the electrolyte not only plays a role in transferring carriers, reducing photogenerated holes and realizing quantum dot regeneration, but also plays a role in oxidation-reduction potential and TiO 2 The difference in fermi levels of (a) determines the open circuit voltage of the cell, so the properties of the electrolyte directly affect the photovoltaic performance of the cell. In the current research of quantum dot sensitized solar cells, polysulfide aqueous solution is mostly adopted as electrolyte, but the defects of easy volatilization, easy leakage and the like of polysulfide aqueous solution cause great obstacles to the stability and practicability of quantum dot sensitized solar cells. The electrolyte is solidified through a certain technology, which is a new idea in the research of the electrolyte of the sensitized solar cell. In recent studies, the types of cured electrolytes can be broadly divided into two types, one being a polymer quasi-solid electrolyte cured in a gel state, and one being a solid electrolyte cured based on a molecular or hole conductor.
At present, methods of stirring solidification or heating stirring and cooling solidification are mostly adopted for solidifying the polysulfide aqueous solution electrolyte into the gel quasi-solid electrolyte, but the methods have the problems of uneven stirring, incomplete stirring and the like when the content of the solidifying agent is high, and even have the phenomenon of slow stirring speed when the consistency of the electrolyte is increased, and the phenomena have great influence on the photovoltaic performance of the battery.
Disclosure of Invention
The invention aims to provide a preparation method of a quasi-solid electrolyte for a quantum dot sensitized solar cell, which is characterized in that on the premise of ensuring that the photovoltaic performance of the quantum dot sensitized solar cell is not influenced, a past electrolyte curing method is innovated, an electrolyte and a curing agent are combined together by adopting a grinding technology, and a polysulfide electrolyte of the quantum dot sensitized solar cell is cured to form the quasi-solid electrolyte, so that the problems that the liquid electrolyte is easy to leak and difficult to store are solved, and the problems that the electrolyte and the curing agent are not uniformly mixed and not thorough due to the past stirring preparation process are solved.
The invention is realized by the following steps:
a preparation method of a quasi-solid electrolyte for a quantum dot sensitized solar cell comprises the following steps:
(1) Preparing polysulfide electrolyte: weighing appropriate amount of Na 2 S·9H 2 Adding deionized water into O and S powder and potassium chloride, stirring until the mixture is uniform, has no particles, is orange, is clear and transparent, and then carrying out ultrasonic decomposition.
(2) Weighing a certain amount of sodium carboxymethylcellulose (CMC-Na) and polyvinylpyrrolidone (PVP) for later use.
(3) Preparing a quasi-solid electrolyte: taking a small amount of sodium carboxymethylcellulose (CMC-Na) and polyvinylpyrrolidone (PVP) and putting into a mortar for uniformly mixing, then adding a small amount of prepared polysulfide electrolyte into the mortar for grinding, and continuously and gradually adding a small amount of polysulfide electrolyte, sodium carboxymethylcellulose (CMC-Na) and polyvinylpyrrolidone (PVP) during grinding until the three are completely and uniformly ground.
(4) The ground quasi-solid electrolyte is filled into a sample bottle and is placed in a shade place for sealed storage.
Further optimization, the step (1)In Na 2 S·9H 2 The mass ratio of O powder to S powder to potassium chloride is 8 2 S·9H 2 The mass ratio of O to deionized water is 1. The stirring process in the step comprises the following steps: stirring at 25 deg.C and rotor speed of 500r for 20min until the polysulfide electrolyte is orange, clear, transparent, uniform and particle-free. The ultrasonic decomposition treatment needs to control the temperature of the ultrasonic machine to be not higher than 40 ℃.
Further optimizing, in the step (2), the mass ratio of the sodium carboxymethyl cellulose (CMC-Na) to the polyvinylpyrrolidone (PVP) is 4.
Further optimizing, in the step (3), the grinding method is as follows: a small amount of sodium carboxymethylcellulose (CMC-Na) and polyvinylpyrrolidone (PVP) are gradually put into a mortar for grinding, and the mass of each time of putting is as follows: 0.4g of sodium carboxymethylcellulose (CMC-Na), 0.3g of polyvinylpyrrolidone (PVP) and 0.5mL of the prepared polysulfide electrolyte. During grinding, the uniform speed is required until the ground product is in a uniform yellow potato paste shape. If one reagent is used up, the rest reagents are ground continuously according to the proportion until the sodium carboxymethyl cellulose (CMC-Na), the polyvinylpyrrolidone (PVP) and the prepared polysulfide electrolyte are used up and the uniform mixing of the sodium carboxymethyl cellulose (CMC-Na), the polyvinylpyrrolidone (PVP) and the prepared polysulfide electrolyte is ensured.
In the conventional research on the dye-sensitized solar cell, the grinding technology is mostly used for preparing the counter electrode, and the preparation of the electrolyte and the quasi-solid electrolyte is basically realized by a stirring process. The invention develops a new method, firstly puts forward that the grinding process is connected with the quasi-solid electrolyte, changes the traditional electrolyte stirring, breaks through the limitation and has great innovation.
The quasi-solid electrolyte for the quantum dot sensitized solar cell is prepared by a grinding method, the method is simple, novel and unique to operate, and the quasi-solid polysulfide electrolyte is obtained by uniformly grinding the curing agent and the polysulfide electrolyte together. The grinding method adopted by the invention is innovative in the electrolyte preparation process, and the prepared quasi-solid electrolyte is convenient to store, solves the problem that the common polysulfide electrolyte is easy to leak, and also solves the problems of uneven and incomplete mixing of the curing agent and the electrolyte caused by stirring and curing. The preparation method is simple and efficient, ensures the same photovoltaic performance as that of the common polysulfide electrolyte, and has good application value.
Drawings
FIG. 1 is an electron microscope image of the surface morphology of the quasi-solid polysulfide electrolyte prepared by grinding process in example 1.
FIG. 2 is an electron microscope image of the surface morphology of the quasi-solid polysulfide electrolyte prepared by the stirring process in example 2.
Fig. 3 is a graph comparing J-V curves of the cells obtained by applying the electrolyte prepared by the milling process in example 1 and the stirring process in example 2 to the quantum dot sensitized solar cell.
Detailed Description
The following examples serve to illustrate the invention in further detail, but without restricting it in any way.
Example 1:
(1) Preparing polysulfide electrolyte: firstly 8gNa 2 S·9H 2 Dissolving O and 1g of S powder in 40mL of deionized water, setting the stirring temperature of a magnetic stirrer to be 25 ℃, setting the rotating speed of a rotor to be 500r, and controlling the stirring time to be 20min until the liquid is orange, clear, transparent, uniform and free of particles. Then, 1g of potassium chloride granules are weighed and put into the liquid and stirred for 20min continuously until the potassium chloride granules are completely dissolved. And finally, placing the prepared polysulfide electrolyte into an ultrasonic machine for ultrasonic decomposition for 10min, controlling the temperature of the ultrasonic machine not to be higher than 40 ℃ in the ultrasonic process, and placing the polysulfide electrolyte in a shade place for sealing and storing after ultrasonic treatment.
(2) Preparing a curing agent material: weighing 16g of sodium carboxymethylcellulose (CMC-Na) and 12g of polyvinylpyrrolidone (PVP) for standby.
(3) Preparing a quasi-solid polysulfide electrolyte: 0.4g of sodium carboxymethylcellulose (CMC-Na) and 0.3g of polyvinylpyrrolidone (PVP) are put into a mortar, and 0.5mL of the prepared polysulfide electrolyte is added dropwise after being uniformly mixed by a mortar rod and ground by a grinding rod. The grinding speed is controlled to be uniform until the curing agent and the polysulfide electrolyte are fully mixed, and the ground shape is a yellow potato mash with uniform texture. And then, continuously adding the curing agent and the polysulfide electrolyte into the mortar according to the proportion for grinding, and repeating the steps for a few times until the grinding is finished completely (in order to ensure the optimal proportion, the weighed two curing agents and the prepared polysulfide electrolyte are used completely, and if the curing agents and the prepared polysulfide electrolyte are used up, the rest of the reagents are continuously ground according to the proportion until the sodium carboxymethylcellulose (CMC-Na) and the polyvinylpyrrolidone (PVP) are used up, and the prepared polysulfide electrolyte is uniformly mixed, which is the same as the above step.
(4) And filling the ground quasi-solid polysulfide electrolyte into a sample bottle, and placing the sample bottle in a shade place for closed storage.
(5) And (3) testing the efficiency of the battery: the quasi-solid electrolyte is coated on a photo-anode adsorbing quantum dots in a blade mode, the quantum dots are completely covered and soaked by the electrolyte in the blade coating process, and then the photo-anode (the photo-anode coated with the quasi-solid polysulfide electrolyte in a blade mode) and an counter electrode (a polished copper sheet) are assembled together to form the complete quantum dot sensitized solar cell. Through the test of simulating standard sunlight, the quasi-solid polysulfide electrolyte prepared by the method is applied to a quantum dot sensitized solar cell, and the photoelectric conversion efficiency of the solar cell is as follows: 6.67 percent.
Example 2:
(1) Preparing polysulfide electrolyte: firstly 8gNa 2 S·9H 2 Dissolving O,1g of S powder in 40mL of deionized water, setting the stirring temperature of a magnetic stirrer to be 25 ℃, setting the rotating speed of a rotor to be 500r, and controlling the stirring time to be 20min until the liquid is orange, clear, transparent, uniform and free of particles. Then, 1g of potassium chloride granules are weighed and put into the liquid and stirred for 20min continuously until the potassium chloride granules are completely dissolved. And finally, placing the prepared polysulfide electrolyte into an ultrasonic machine for ultrasonic decomposition for 10min, controlling the temperature of the ultrasonic machine not to be higher than 40 ℃ in the ultrasonic process, and placing the polysulfide electrolyte in a shade place for sealing and storing after ultrasonic treatment.
(2) Preparing a curing agent material: weighing 16g of sodium carboxymethylcellulose (CMC-Na) and 12g of polyvinylpyrrolidone (PVP) for later use.
(3) Preparing a quasi-solid polysulfide electrolyte: firstly, 12g of polyvinylpyrrolidone (PVP) is added into the prepared polysulfide electrolyte, and the polysulfide electrolyte is stirred by a magnetic stirrer, the stirring temperature of the magnetic stirrer is set to be 25 ℃, the rotating speed of a rotor is set to be 500r, and the stirring time is controlled to be 20min until the liquid is orange, clear, transparent, uniform and free of particles. Then, 16g of sodium carboxymethylcellulose (CMC-Na) is added into the mixture, and the mixture is stirred by a magnetic stirrer, wherein the stirring temperature of the magnetic stirrer is set to be 25 ℃, the rotating speed of a rotor is set to be 300r, and the stirring time is controlled to be 20min until the gel is formed. The stirring state is observed all the time, if the speed of the stirring rotor is reduced or even does not rotate due to the increase of the consistency of the electrolyte, the speed of the magnetic stirrer and the position of the bottle are adjusted in time to ensure the uniform mixing of the sodium carboxymethylcellulose and the electrolyte. And finally, placing the prepared quasi-solid polysulfide electrolyte into an ultrasonic machine for ultrasonic decomposition for 10min, and controlling the temperature of the ultrasonic machine not to be higher than 40 ℃ in the ultrasonic process.
(4) And filling the prepared quasi-solid polysulfide electrolyte into a sample bottle, and hermetically storing the sample bottle in a shade place.
(5) And (3) testing the efficiency of the battery: the quasi-solid electrolyte is coated on a photo-anode adsorbing quantum dots in a scraping way, the quantum dots are ensured to be completely covered and soaked by the electrolyte in the scraping way, and then the photo-anode coated with the quasi-solid polysulfide electrolyte and a counter electrode (polished copper sheet) are assembled together to construct a complete quantum dot sensitized solar cell. Through the test of simulating standard sunlight, the quasi-solid polysulfide electrolyte prepared by the method is applied to a quantum dot sensitized solar cell, and the photoelectric conversion efficiency of the solar cell is as follows: 5.31 percent.
SEM tests were performed on the quasi-solid polysulfide electrolytes prepared in examples 1 and 2, and the results are shown in fig. 1 and 2, respectively. The quasi-solid polysulfide electrolytes prepared in example 1 and example 2 were used in quantum dot sensitized solar cells, and the J-V curves of the cells are shown in fig. 3.
As can be seen from the electron microscope images in fig. 1 and fig. 2, the quasi-solid electrolyte prepared by the stirring process has fewer surface voids and smoother surface, and forms a thin film layer, which may be caused by that the mixed surface of the electrolyte and the CMC-Na is hermetically distributed due to the stirring, so that interparticle pores cannot be clearly distinguished, and the diffusion of the electrolyte is not facilitated. The electrolyte prepared by the grinding process has larger gaps on the surface, and can promote the permeation of the electrolyte, thereby increasing the rapid diffusion of redox couples, and being beneficial to the exertion of the function of the electrolyte and the normal work of the battery.
As can be seen from FIG. 3, in the case of only changing the curing method without changing the specification and content of the used reagents, and comparing with the stirring process, the quasi-solid polysulfide electrolyte prepared by the innovative grinding process of the invention is applied to the quantum dot sensitized solar cell, and the photovoltaic performance of the cell is greatly improved.
Example 3:
(1) Preparing a polysulfide electrolyte: firstly 8gNa 2 S·9H 2 Dissolving O and 1g of S powder in 40mL of deionized water, setting the stirring temperature of a magnetic stirrer to be 25 ℃, setting the rotating speed of a rotor to be 500r, and controlling the stirring time to be 20min until the liquid is orange, clear, uniform and free of particles. Then, 1g of potassium chloride granules was weighed into the above liquid and stirred for another 20min until the potassium chloride granules were completely dissolved. And finally, placing the prepared polysulfide electrolyte into an ultrasonic machine for ultrasonic decomposition for 10min, controlling the temperature of the ultrasonic machine not to be higher than 40 ℃ in the ultrasonic process, and placing the polysulfide electrolyte in a shade place for sealing and storing after ultrasonic treatment.
(2) Preparing a curing agent material: 12g of sodium carboxymethylcellulose (CMC-Na) and 9g of polyvinylpyrrolidone (PVP) are weighed for standby.
(3) Preparing a quasi-solid polysulfide electrolyte: 0.4g of sodium carboxymethylcellulose (CMC-Na) and 0.3g of polyvinylpyrrolidone (PVP) are put into a mortar, and 0.5mL of the prepared polysulfide electrolyte is added dropwise after being uniformly mixed by a mortar rod and ground by a grinding rod. The grinding speed is controlled to be uniform until the curing agent and the polysulfide electrolyte are fully mixed, and the ground shape is a yellow potato mash with uniform texture. And then, continuously adding the curing agent and the polysulfide electrolyte into the mortar according to the proportion for grinding, and repeating the steps for a few times until the grinding is finished.
(4) And filling the ground quasi-solid polysulfide electrolyte into a sample bottle, and placing the sample bottle in a shade place for closed storage.
(5) And (3) testing the efficiency of the battery: and scraping the quasi-solid electrolyte on a photo-anode adsorbed with the quantum dots, ensuring that the quantum dots are completely covered and infiltrated by the electrolyte during scraping, and then assembling the photo-anode (coated quasi-solid polysulfide electrolyte) and a counter electrode (copper sheet) together to construct a complete quantum dot sensitized solar cell. Through the test of simulating standard sunlight, the quasi-solid polysulfide electrolyte prepared by the method is applied to a quantum dot sensitized solar cell, and the photoelectric conversion efficiency of the solar cell is as follows: 5.87 percent.
Example 4:
(1) Preparing a polysulfide electrolyte: firstly 8gNa 2 S·9H 2 Dissolving O and 1g of S powder in 40mL of deionized water, setting the stirring temperature of a magnetic stirrer to be 25 ℃, setting the rotating speed of a rotor to be 500r, and controlling the stirring time to be 20min until the liquid is orange, clear, uniform and free of particles. Then, 1g of potassium chloride granules was weighed into the above liquid and stirred for another 20min until the potassium chloride granules were completely dissolved. And finally, placing the prepared polysulfide electrolyte into an ultrasonic machine for ultrasonic decomposition for 10min, controlling the temperature of the ultrasonic machine not to be higher than 40 ℃ in the ultrasonic process, and placing the polysulfide electrolyte in a shade place for sealing and storing after ultrasonic treatment.
(2) Preparing a curing agent material: 20g of sodium carboxymethylcellulose (CMC-Na) and 15g of polyvinylpyrrolidone (PVP) are weighed for standby.
(3) Preparing a quasi-solid polysulfide electrolyte: 0.4g of sodium carboxymethylcellulose (CMC-Na) and 0.3g of polyvinylpyrrolidone (PVP) are put into a mortar, and 0.5mL of the prepared polysulfide electrolyte is added dropwise after being uniformly mixed by a mortar rod and ground by a grinding rod. The grinding speed is controlled to be uniform until the curing agent and the polysulfide electrolyte are fully mixed, and the ground form is a yellow potato mash with uniform texture. And then, continuously adding the curing agent and the polysulfide electrolyte into the mortar according to the proportion for grinding, and repeating the steps for a few times until the grinding is finished.
(4) And filling the ground quasi-solid polysulfide electrolyte into a sample bottle, and placing the sample bottle in a shade place for closed storage.
(5) And (3) testing the efficiency of the battery: the quasi-solid electrolyte is coated on a photo-anode adsorbing quantum dots in a blade mode, the quantum dots are completely covered and soaked by the electrolyte in the blade coating process, and then the photo-anode (coated quasi-solid polysulfide electrolyte) and a counter electrode (copper sheet) are assembled together to form the complete quantum dot sensitized solar cell. Through the test of simulating standard sunlight, the quasi-solid polysulfide electrolyte prepared by the method is applied to a quantum dot sensitized solar cell, and the photoelectric conversion efficiency of the solar cell is as follows: 6.01 percent.
By comparing example 1 with examples 3 and 4, on the premise that the quasi-solid electrolyte is prepared by using a grinding method, the ratio of the polysulfide electrolyte and the curing agent used in example 1 is the optimal ratio, and the quasi-solid polysulfide electrolyte prepared by using the ratio in example 1 is applied to a quantum dot sensitized solar cell, and the cell can show the best photovoltaic performance.
Claims (5)
1. A preparation method of a quasi-solid electrolyte for a quantum dot sensitized solar cell is characterized by comprising the following steps:
a. preparing a polysulfide electrolyte: weighing Na 2 S·9H 2 Adding deionized water into O and S powder and potassium chloride, stirring until the mixture is uniform, free of particles, orange, clear and transparent, and then performing ultrasonic decomposition;
b. weighing curing agents of sodium carboxymethylcellulose and polyvinylpyrrolidone for later use;
c. preparing a quasi-solid electrolyte: sequentially taking the sodium carboxymethylcellulose, the polyvinylpyrrolidone and the polysulfide electrolyte according to a set proportion, mixing and grinding in a mortar until the sodium carboxymethylcellulose, the polyvinylpyrrolidone and the polysulfide electrolyte are completely and uniformly ground;
d. the ground quasi-solid electrolyte is filled into a sample bottle and is placed in a shade place for sealed storage.
2. The quasi-solid electrolyte for a quantum dot sensitized solar cell according to claim 1The process of (a), wherein in the step (a), na 2 S·9H 2 The mass ratio of O powder to S powder to potassium chloride is 8; na (Na) 2 S·9H 2 The mass ratio of O to deionized water is 1.
3. The method for preparing the quasi-solid electrolyte for the quantum dot sensitized solar cell according to claim 1, wherein in the step a, the stirring process comprises: stirring at 25 deg.C and rotor speed of 500r for 20min until the polysulfide electrolyte is orange, clear, transparent, uniform and particle-free; the ultrasonic decomposition treatment needs to control the temperature of the ultrasonic machine not to be higher than 40 ℃.
4. The method of claim 1, wherein in the step b, the mass ratio of the sodium carboxymethylcellulose to the polyvinylpyrrolidone is 4.
5. The method of claim 1, wherein the amounts of the sodium carboxymethyl cellulose, the polyvinylpyrrolidone and the polysulfide electrolyte added in step c are 0.4g, 0.3g and 0.5mL per milling, respectively.
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