Multifunctional flexible ionic gel generator and preparation method thereof

Abstract

The invention is applicable to the technical field of energy conversion, and provides a multifunctional flexible ionic gel generator and a preparation method thereof, and the multifunctional flexible ionic gel generator comprises an upper layer carbon electrode, a flexible ionic gel layer and a lower layer carbon electrode which are sequentially connected from top to bottom. The preparation method of the flexible ionic gel layer comprises the following steps: mixing a matrix material, a thermoelectric response material, a moisture absorption material and deionized water, carrying out a cross-linking reaction, and standing in a mold to obtain the flexible ionic gel layer. Lithium chloride, sodium polystyrenesulfonate and other materials are introduced into an acrylamide and carboxymethyl cellulose hydrogel matrix, simple crosslinking is performed to form flexible ionic gel, and meanwhile low-grade heat energy and moisture energy are collected and converted into electric energy. On the basis of cooperation of thermoelectricity and moisture power generation, collection of chemical energy and response to pressure are completed, and multiple functions are achieved.

Description

Technical Field

[0001] This invention belongs to the field of energy conversion technology, and in particular relates to a multifunctional flexible ion gel generator and its preparation method. Background Technology

[0002] With the rapid growth of energy demand, the use of fossil fuels has also increased, which has not only amplified greenhouse gas emissions but also caused pollution and damage to the environment. Furthermore, the excessive use of fossil fuels has exacerbated the global energy crisis, causing irreversible impacts on the environment and normal human life. Therefore, there is an urgent need to find green energy conversion technologies to meet the energy needs of future generations. Thermoelectric technology and wet gas power generation technology are both emerging technologies that convert other forms of energy into electricity in recent years. They respectively extract low-grade heat energy from the environment, industrial processes, and the human body, and large amounts of moisture energy, showing considerable potential for providing sustainable electricity. Currently, both thermoelectric and wet gas power generation technologies have achieved good results and breakthroughs, but research on the synergistic generation of these two technologies, simultaneously collecting low-grade heat energy and moisture energy in different environments and converting them into electricity, still needs improvement and development.

[0003] To address this issue, thermoelectric and moisture-powered electricity generation technologies can be cleverly linked through a single matrix using hydrogels as a carrier. Hydrogels, due to their morphological stability, certain mechanical properties, and high water content, are often used as matrix materials for batteries or generators, thus solving problems such as liquid electrolyte leakage and complex manufacturing processes, and also providing greater possibilities for the development of wearable devices. However, considering factors such as temperature difference, humidity, biocompatibility, toxicity, and output efficiency, while progress has been made in using hydrogels to achieve synergistic power generation from temperature difference and humidity, there is still room for improvement in energy conversion efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a multifunctional flexible ion gel generator and its preparation method, thereby addressing the problems mentioned in the background art.

[0005] The present invention is implemented as follows: a multifunctional flexible ion gel generator includes an upper carbon electrode, a flexible ion gel layer and a lower carbon electrode connected sequentially from top to bottom.

[0006] In a further technical solution, the upper carbon electrode is a porous graphite electrode, and the lower carbon electrode is a graphite electrode. The matrix material of the flexible ionogel layer is acrylamide and carboxymethyl cellulose, the thermoelectric responsive material is lithium chloride, and the hygroscopic material is sodium polystyrene sulfonate.

[0007] A further technical solution is provided, specifically the preparation method of the flexible ionogel layer as follows: The matrix material, thermoelectric responsive material, hygroscopic material and deionized water are mixed and cross-linked. After the mixture is placed in a mold, a flexible ionogel layer is obtained.

[0008] In a further technical solution, the mass ratio of the deionized water to the matrix material is (25~30):(7.5~8).

[0009] In a further technical solution, based on the volume of deionized water, the concentration of the thermoelectric response material is 1.5~2.5 mol / L, and the concentration of the hygroscopic material is 0.08~0.12 mol / L.

[0010] A further technical solution involves mixing the matrix material, thermoelectric response material, hygroscopic material, and deionized water at a temperature of 60°C.

[0011] In a further technical solution, the crosslinking reaction is carried out in an oven at a temperature of 60°C for a reaction time of 1 hour.

[0012] This invention provides a multifunctional flexible ion gel generator and its preparation method. By introducing materials such as lithium chloride and sodium polystyrene sulfonate into an acrylamide and carboxymethyl cellulose hydrogel matrix, simple cross-linking is performed to form an ion-type gel. Simultaneously, low-grade thermal energy and moisture energy are collected and converted into electrical energy. Based on the synergy of thermoelectric and moisture power generation, it also achieves the collection of chemical energy and pressure response and sensing effects, possessing multiple functions. Under conditions of a temperature difference of 50K and 90%RH, a single multifunctional flexible ion gel generator can achieve an open-circuit voltage of 1144.0mV, a short-circuit current of 3.86mA, and a maximum output power density of 176μW•cm. -2 The Seebeck coefficient obtained is approximately 20.82 mV / K, exhibiting excellent electrical performance and high power density, which can well meet the power generation requirements. It also has good effects on the collection of low-grade heat energy and the utilization of moisture in the environment. Attached Figure Description

[0013] Figure 1 A flowchart illustrating the preparation process of a flexible ion gel layer in a multifunctional flexible ion gel generator, as provided in an embodiment of the present invention; Figure 2 A flowchart illustrating the fabrication process of a multifunctional flexible ion gel generator provided in an embodiment of the present invention; Figure 3 A schematic diagram illustrating the power generation principle of a multifunctional flexible ion gel generator provided in an embodiment of the present invention; Figure 4 This is a schematic diagram showing the open-circuit voltage and maximum short-circuit current of the ionogels in Examples 1 to 8; Figure 5 This is a schematic diagram showing the open-circuit voltage and maximum short-circuit current of the multifunctional flexible ion gel generators in Examples 1, 9 to 15. Figure 6 The diagram shows the open-circuit voltage and maximum short-circuit current of the multifunctional flexible ion gel generators in Example 1 and Comparative Examples 1 to 4.

[0014] In the attached diagram: upper carbon electrode 1; flexible ion gel layer 2; lower carbon electrode 3. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0016] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0017] like Figure 2 As shown, a multifunctional flexible ion gel generator provided in one embodiment of the present invention includes an upper carbon electrode 1, a flexible ion gel layer 2 and a lower carbon electrode 3 connected sequentially from top to bottom.

[0018] Under conditions of a temperature difference of 50K and 90%RH, the open-circuit voltage of a single multifunctional flexible ion gel generator can reach up to 1144.0mV, and the short-circuit current can reach up to 3.86mA.

[0019] In a preferred embodiment of the present invention, the upper carbon electrode 1 is a porous graphite electrode, and the lower carbon electrode 3 is a graphite electrode. The matrix material of the flexible ionogel layer 2 is acrylamide and carboxymethyl cellulose, the thermoelectric responsive material is lithium chloride, and the moisture-absorbing material is sodium polystyrene sulfonate.

[0020] like Figure 1 and Figure 3 As shown, in a preferred embodiment of the present invention, the preparation method of the flexible ionogel layer 2 is as follows: The matrix material, thermoelectric responsive material, hygroscopic material and deionized water are mixed and cross-linked. After the mixture is placed in a mold, a flexible ionogel layer is obtained.

[0021] In a preferred embodiment of the present invention, the mass ratio of deionized water to matrix material is (25~30):(7.5~8). In a preferred embodiment of the present invention, the concentration of the thermoelectric response material is 1.5~2.5 mol / L based on the volume of deionized water, and the concentration of the hygroscopic material is 0.08~0.12 mol / L.

[0022] In a preferred embodiment of the present invention, the matrix material, thermoelectric response material, hygroscopic material and deionized water are mixed at a temperature of 60°C.

[0023] In a preferred embodiment of the present invention, the crosslinking reaction is carried out in an oven at a temperature of 60°C for a reaction time of 1 hour.

[0024] The following are several specific embodiments to verify the effectiveness of the present invention.

[0025] Example 1: A method for preparing a multifunctional flexible ion gel generator, comprising the following steps: Step 1: Thoroughly mix 6.0g of acrylamide (PAM) and 0.6g of carboxymethyl cellulose (CMC), dissolve in 23.4g of deionized water, and magnetically stir at 60℃ and 650r / min for 20min until the solution is fully mixed and no white crystals are visible. Step 2: Add 0.53g of lithium chloride (LiCl) and 0.1g of sodium polystyrene sulfonate (PSSNa) to the mixture obtained in Step 1, stir evenly, let stand, and wait for the mixed solution to cool to room temperature. Then add 0.048g of initiator ammonium persulfate (APS) and 0.018g of crosslinking agent N,N'-methylenebisacrylamide (MBAA), mix evenly, take 5mL of the obtained solution and put it into a 2.5cm×2.5cm×5cm mold for shaping. Then place it in an oven at 60℃ for 1h to obtain flexible ionogel layer 2.

[0026] Step 3: Sandwich the flexible ion gel layer 2 between the upper carbon electrode 1 and the lower carbon electrode 3; Step 4: Place the obtained multifunctional flexible ion gel generator in an environment with a relative humidity of 90% and a temperature difference of 50K between the upper and lower electrode plates, and measure its open-circuit voltage and short-circuit current.

[0027] Example 2: The only difference from Example 1 is that lithium chloride is not added in step 1.

[0028] Example 3: The only difference from Example 1 is that in step 1, the concentration of lithium chloride is 0.5 mol / L and the amount added is 0.105 g.

[0029] Example 4: The only difference from Example 1 is that in step 1, the concentration of lithium chloride is 1 mol / L and the amount added is 0.212 g.

[0030] Example 5: The only difference from Example 1 is that in step 1, the concentration of lithium chloride is 1.5 mol / L and the amount added is 0.318 g.

[0031] Example 6: The only difference from Example 1 is that in step 1, the concentration of lithium chloride is 2 mol / L and the amount added is 0.424 g.

[0032] Example 7: The only difference from Example 1 is that in step 1, the concentration of lithium chloride is 3 mol / L and the amount added is 0.636 g.

[0033] Example 8: The only difference from Example 1 is that in step 1, the concentration of lithium chloride is 3.5 mol / L and the amount added is 0.742 g.

[0034] Example 9: The only difference from Example 1 is that sodium polystyrene sulfonate is not added in step 1.

[0035] Example 10: The only difference from Example 1 is that in step 1, the concentration of sodium polystyrene sulfonate is 0.02 mol / L and the amount added is 0.021 g.

[0036] Example 11: The only difference from Example 1 is that in step 1, the concentration of sodium polystyrene sulfonate is 0.04 mol / L and the amount added is 0.041 g.

[0037] Example 12: The only difference from Example 1 is that in step 1, the concentration of sodium polystyrene sulfonate is 0.06 mol / L and the amount added is 0.062 g.

[0038] Example 13: The only difference from Example 1 is that in step 1, the concentration of sodium polystyrene sulfonate is 0.08 mol / L and the amount added is 0.082 g.

[0039] Example 14: The only difference from Example 1 is that in step 1, the concentration of sodium polystyrene sulfonate is 0.12 mol / L and the amount added is 0.124 g.

[0040] Example 15: The only difference from Example 1 is that in step 1, the concentration of sodium polystyrene sulfonate is 0.14 mol / L and the amount added is 0.144 g.

[0041] Comparative Example 1: The only difference from Example 1 is that in step 4, the multifunctional flexible ion gel generator is placed in an environment with a relative humidity of 90% and a temperature difference of 40K between the upper and lower electrode plates.

[0042] Comparative Example 2: The only difference from Example 1 is that in step 4, the multifunctional flexible ion gel generator is placed in an environment with a relative humidity of 90% and a temperature difference of 30K between the upper and lower electrode plates.

[0043] Comparative Example 3: The only difference from Example 1 is that in step 4, the multifunctional flexible ion gel generator is placed in an environment with a relative humidity of 90% and a temperature difference of 20K between the upper and lower electrode plates.

[0044] Comparative Example 4: The only difference from Example 1 is that in step 4, the multifunctional flexible ion gel generator is placed in an environment with a relative humidity of 90% and a temperature difference of 10K between the upper and lower electrode plates.

[0045] The performance test results of Examples 1 to 8 are shown in Table 1 below. Table 1 Performance test results of Examples 1 to 8

[0046] From Table 1 and Figure 4 It can be seen that under the conditions of relative humidity of 90% and temperature difference between the upper and lower electrode plates of 50K, the open-circuit voltage and short-circuit current of a single multifunctional flexible ion gel generator first increase and then decrease with the increase of lithium chloride concentration. When the lithium chloride concentration is 2.5mol / L, the maximum open-circuit voltage is 782.1mV and the maximum short-circuit current is 3.1mA.

[0047] The performance test results of Examples 1 and 9 to 15 are shown in Table 2 below; Table 2 Performance test results of Examples 1 and 9 to 15

[0048] From Table 2 and Figure 5 It can be seen that under the conditions of relative humidity of 90% and temperature difference between the upper and lower electrode plates of 50K, the open-circuit voltage and short-circuit current of a single multifunctional flexible ion gel generator first increase and then decrease with the increase of sodium polystyrene sulfonate concentration. When the sodium polystyrene sulfonate concentration is 0.1mol / L, the maximum open-circuit voltage is 249.5mV and the maximum short-circuit current is 168.0μA.

[0049] The performance test results of Example 1 and Comparative Examples 1 to 4 are shown in Table 3 below; Table 3 Performance test results of Example 1 and Comparative Examples 1 to 4

[0050] from Figure 6As shown in Table 3, under conditions of relative humidity of 90% and temperature differences between the upper and lower electrode plates of 50K, 40K, 30K, 20K and 10K respectively, this multifunctional flexible ion gel generator can collect thermal energy and moisture energy and produce a synergistic effect, thereby obtaining more power output. The maximum open-circuit voltage is 1144.0mV and the maximum short-circuit current is 3.86mA.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multifunctional flexible ion gel generator, characterized in that, It includes an upper carbon electrode, a flexible ion gel layer, and a lower carbon electrode connected sequentially from top to bottom; The upper carbon electrode is a porous graphite electrode, and the lower carbon electrode is a graphite electrode. The matrix material of the flexible ionogel layer is acrylamide and carboxymethyl cellulose, the thermoelectric responsive material is lithium chloride, and the hygroscopic material is sodium polystyrene sulfonate.

2. The multifunctional flexible ion gel generator according to claim 1, characterized in that, The specific method for preparing the flexible ionogel layer is as follows: The matrix material, thermoelectric responsive material, hygroscopic material and deionized water are mixed and cross-linked. After the mixture is placed in a mold, a flexible ionogel layer is obtained.

3. The multifunctional flexible ion gel generator according to claim 2, characterized in that, The mass ratio of the deionized water to the matrix material is (25~30):(7.5~8).

4. The multifunctional flexible ion gel generator according to claim 3, characterized in that, The concentration of the thermoelectric response material is 1.5~2.5 mol / L based on the volume of deionized water, and the concentration of the hygroscopic material is 0.08~0.12 mol / L.

5. The multifunctional flexible ion gel generator according to claim 2, characterized in that, The matrix material, thermoelectric response material, hygroscopic material, and deionized water were mixed at a temperature of 60°C.

6. The multifunctional flexible ion gel generator according to claim 5, characterized in that, The cross-linking reaction was carried out in an oven at 60°C for 1 hour.

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