An ion-gelatin hydrogel droplet-based light collection device and a preparation method and application thereof

Abstract

The application discloses an ion gelatin hydrogel droplet-based light collection device and a preparation method and application thereof, relates to the technical field of light collection, and comprises an electrode module and a gelatin hydrogel functional layer which are sequentially arranged on a substrate module; the substrate module is a substrate sheet; the substrate sheet is any one of a flexible substrate sheet or a rigid substrate sheet; the electrode module is a metal electrode arranged on both sides of the gelatin hydrogel functional layer; and the gelatin hydrogel functional layer comprises ordinary hydrogel droplets and light-responsive hydrogel droplets. The light collection device can be prepared by using only a simple drop casting method, the device can be used for collecting various clean energy, realizes light collection and supports manufacturing of units with any size or shape, has the advantages of simple system, and still has output capacity after light is removed, and the difficulties of complex structure and poor biocompatibility in traditional light collection devices are solved.

Description

Technical Field

[0001] This invention relates to the field of light collection technology, specifically to a light collection device based on ionized gelatin hydrogel droplets, its preparation method, and its application. Background Technology

[0002] Energy harvesting technology offers a promising alternative to traditional continuous energy conversion and storage, closely aligned with strategic goals for sustainable energy development. Light harvesting devices that collect ambient light can power electronic devices, soft robots, and smart IoT sensors without the need for wired connections or battery replacements. Ideally, energy harvesting devices should combine biocompatibility, mechanical flexibility, and efficient energy conversion and storage. However, current light harvesting devices are primarily based on solid or liquid systems, integrating separate conversion and storage modules. This integration not only limits compatibility and space utilization but also increases manufacturing, maintenance, and repair costs due to the complexity of combining multiple components. Therefore, developing flexible, biocompatible devices suitable for a wide range of applications is challenging.

[0003] In summary, how to propose a flexible, biocompatible light-harvesting device and its fabrication method that can collect light and convert it into electricity output, while having a simple structure, has become an important problem that the industry urgently needs to solve. Summary of the Invention

[0004] The purpose of this invention is to provide a light-collecting device based on ionized gelatin hydrogel droplets, its preparation method, and its application, thereby solving the above-mentioned problems. The light-collecting device prepared has the characteristics of simple structure, low cost, good biocompatibility, and the ability to convert light collection into power output.

[0005] This invention discloses a light-collecting device based on ionized gelatin hydrogel droplets, comprising an electrode module and a gelatin hydrogel functional layer sequentially disposed on a substrate module;

[0006] The substrate module is a substrate sheet, which can be either a flexible substrate sheet or a rigid substrate sheet.

[0007] The electrode module consists of metal electrodes disposed on both sides of the gelatin hydrogel functional layer.

[0008] The gelatin hydrogel functional layer includes ordinary hydrogel droplets and photoresponsive hydrogel droplets.

[0009] The present invention also provides a method for preparing the above-mentioned light-collecting device, comprising the following steps:

[0010] S1. Clean the substrate with deionized water and modify its surface using a plasma cleaner.

[0011] S2. Deposit a metal thin film on the substrate using a coating technique or attach a commercial metal sheet to the substrate as a metal electrode, leaving a gap between the two metal electrodes for subsequent drop casting of hydrogel droplets.

[0012] S3. Mix gelatin material with deionized water and alcohol material to obtain ordinary hydrogel droplet dispersion P1; mix gelatin material with deionized water, photoresponsive material and alcohol material to obtain photoresponsive hydrogel droplet dispersion P2.

[0013] S4: Drop casting of ordinary hydrogel droplet dispersion P1 and photoresponsive hydrogel droplet dispersion P2 onto the gap between the two metal electrodes on the substrate, ensuring that the two droplets are in contact with the electrodes on both sides and that the interface between the two droplets is also in contact with each other; after the drop casting is completed, let it stand at room temperature.

[0014] S5: Wires are configured on the two metal electrodes respectively to obtain a light collection device based on ion gelatin hydrogel droplets.

[0015] Preferably, in step S1, the substrate includes, but is not limited to, flexible polyethylene terephthalate or rigid glass.

[0016] Preferably, in step S2, the metal electrode includes, but is not limited to, gold, copper, platinum, silver, and zinc, and the coating technology includes, but is not limited to, magnetron sputtering technology and thermal evaporation technology; a gap of 5mm-40mm is retained in the middle of the metal electrode.

[0017] Preferably, a 10mm gap is maintained in the middle of the metal electrode.

[0018] Preferably, in step S3, the mass ratio of gelatin material, deionized water, and alcohol material in the ordinary hydrogel droplet dispersion P1 is (1-3):10:(2-8), wherein the alcohol material includes, but is not limited to, one of ethylene glycol, glycerol, and ethanol.

[0019] In the photoresponsive hydrogel droplet dispersion P2, the mass ratio of gelatin material, deionized water, photoresponsive material and alcohol material is (1-3):10:(0.2-0.8):(2-8).

[0020] Preferably, in step S3, the mass ratio of gelatin material, deionized water, and alcohol material in the ordinary hydrogel droplet dispersion P1 is 1.5:10:5, and the mass ratio of gelatin material, deionized water, photoresponsive material, and alcohol material in the photoresponsive hydrogel droplet dispersion P2 is 1.5:10:0.5:5.

[0021] Preferably, the photoresponsive material includes, but is not limited to, ammonium molybdate, tungstic acid, ammonium tungstate, and one of other polyoxometalate materials; the polyol material includes, but is not limited to, ethylene glycol, glycerol, and ethanol; the dissolution temperature is 40℃-50℃, and the heating method is a water bath.

[0022] Preferably, in step S4, the patterns of P1 and P2 droplets during casting include, but are not limited to, squares and circles, and their sizes include symmetrical ones that are the same or different, with a settling time of 10-20 minutes.

[0023] Preferably, in step S5, the wires used to configure the metal electrodes are copper wires.

[0024] The present invention provides a light collection device based on ionized gelatin hydrogel droplets that undergoes a photochemical reaction under excitation light, has voltage output performance, and retains it after the light is removed. It can be applied in the fields of light collection, biomedicine, and flexible electronics.

[0025] Therefore, the present invention, employing the above-described light-collecting device based on ion-gelatin hydrogel droplets, its preparation method, and its application, possesses the following beneficial effects:

[0026] The gelatin hydrogel functional layer in this invention features two-component droplets. Ordinary gelatin hydrogel droplets maintain the photostability of the system, while photoresponsive hydrogel droplets, upon photoexcitation, alter the concentration of surrounding charged particles and the redox potential. Therefore, upon excitation, an ion concentration gradient is generated between the ordinary hydrogel droplets and the photoresponsive hydrogel droplets, while the hydrogel droplets ensure ion diffusion and biocompatibility. The change in redox potential leads to a change in the electrode potential, thus, under the combined effect of the ion concentration gradient and the redox pair, a voltage is generated across the electrodes, or a current is formed in the circuit. During energy conversion, light energy is first converted into chemical energy, and then into electrical energy through the capacitor-like storage mechanism of the electrodes. This highlights the potential of ions as carriers for converting and storing environmental light energy. Simultaneously, the prepared material exhibits excellent flexibility and adaptability; its hydrogel droplets exhibit liquid characteristics at 45 degrees Celsius and spontaneously construct a stable three-dimensional hydrogel network within a short time at room temperature. This phase change process has good thermal reversibility, and the matching power generation device adopts a simple structural design. The device can be assembled through a convenient drop casting process, showing broad application potential in the fields of energy harvesting and bioelectronic devices.

[0027] The photoelectric power generation device constructed based on ionic gelatin hydrogel droplets described in this invention can achieve a steady-state voltage output on the order of 250mV under photoexcitation conditions, and can still maintain a significant residual potential response one hour after the light exposure ends. Furthermore, due to the unique advantages of the rheological properties of the hydrogel droplets, it supports the construction of arbitrary geometric configuration units. When the feature size of the device is reduced by tens of times, its open-circuit voltage output characteristic can still be stably maintained at the 250mV reference level. Linear superposition of output performance can be achieved by using basic series and parallel combinations, providing a feasible technical path for constructing large-scale energy harvesting arrays.

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a light collection device based on ionized gelatin hydrogel droplets according to the present invention;

[0030] Figure 2 This is a physical image of the light collection device based on ionized gelatin hydrogel droplets in Embodiment 1 of the present invention;

[0031] Figure 3 The images show the liquid and solid states of ordinary hydrogel droplets and photoresponsive hydrogel droplets in the light collection device based on ionized gelatin hydrogel droplets in Embodiment 1 of this invention.

[0032] Figure 4 The graphs show the photoexcitation voltage output performance of the light collection devices based on ion-gel hydrogel droplets prepared in Examples 1 and 2 of this invention, tested under different electrodes.

[0033] Figure 5 The graphs show the photoexcitation voltage output performance of the light collection devices based on ion-gel hydrogel droplets prepared in Examples 1, 3 and 4 of this invention at different volume sizes.

[0034] Figure 6 This is a diagram illustrating the application of the light-collecting device based on ionized gelatin hydrogel droplets prepared in Example 1 of this invention for the repair of epidermal wounds in organisms.

[0035] Figure label:

[0036] 1. First metal electrode; 2. Second metal electrode; 3. Ordinary gelatin hydrogel droplet; 4. Photoresponsive gelatin hydrogel droplet; 5. Substrate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following description will be provided in conjunction with the accompanying drawings of the embodiments of the present invention. Figures 1 to 6The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "center", "around", "lateral", "longitudinal", "length", "thickness", "angle", "up", "down", "left", "right", etc., which indicate the orientation or location, are limited to simplifying the description of this invention and are not specific locations or orientations. The above terms are not intended to limit this invention.

[0039] This invention discloses a light collection device based on ionized gelatin hydrogel droplets, comprising an electrode module and a gelatin hydrogel functional layer sequentially disposed on a substrate module; the substrate module is a substrate sheet, which can be either a flexible substrate sheet or a rigid substrate sheet; the electrode module consists of metal electrodes disposed on both sides of the gelatin hydrogel functional layer.

[0040] The gelatin hydrogel functional layer includes ordinary hydrogel droplets and photoresponsive hydrogel droplets.

[0041] The present invention also provides a method for preparing the above-mentioned light-collecting device, comprising the following steps:

[0042] S1. Clean the substrate with deionized water and perform surface modification using a plasma cleaner.

[0043] S2. Deposit a thin metal film on the substrate using a coating technique or attach a commercially available metal sheet to the substrate as a metal electrode, leaving a gap between the two metal electrodes for subsequent droplet casting of hydrogel.

[0044] S3. Mix gelatin material with deionized water and alcohol material to obtain ordinary hydrogel droplet dispersion P1; mix gelatin material with deionized water, photoresponsive material and alcohol material to obtain photoresponsive hydrogel droplet dispersion P2.

[0045] S4: Drop the ordinary hydrogel droplet dispersion P1 and the photoresponsive hydrogel droplet dispersion P2 onto the gap between the two metal electrodes on the substrate, ensuring that the two droplets are in contact with the electrodes on both sides and that the interface between the two droplets is also in contact with each other; after the droplet casting is completed, let it stand at room temperature.

[0046] S5: Wires are configured on the two metal electrodes respectively to obtain a light collection device based on ion gelatin hydrogel droplets.

[0047] In step S1, the substrate includes, but is not limited to, flexible polyethylene terephthalate or rigid glass.

[0048] In step S2, the metal electrodes include, but are not limited to, gold, copper, platinum, silver, and zinc, and the coating technology includes, but is not limited to, magnetron sputtering technology and thermal evaporation technology; a gap of 5mm-40mm is retained in the middle of the metal electrodes, wherein a gap length of 10mm has a better effect.

[0049] In step S3, the mass ratio of gelatin material, deionized water and alcohol material in ordinary hydrogel droplet dispersion P1 is (1-3):10:(2-8). When the ratio is 1.5:10:5, the effect is better. Among them, alcohol material includes, but is not limited to, one of ethylene glycol, glycerol and ethanol.

[0050] In the photoresponsive hydrogel droplet dispersion P2, the mass ratio of gelatin, deionized water, photoresponsive material, and alcohol is (1-3):10:(0.2-0.8):(2-8). When the ratio is 1.5:10:0.5:5, the effect is better.

[0051] The photoresponsive materials include, but are not limited to, ammonium molybdate, tungstic acid, ammonium tungstate, and one of other polyoxometalate materials; the polyol materials include, but are not limited to, ethylene glycol, glycerol, and ethanol; the dissolution temperature is 40℃-50℃, and the heating method is a water bath.

[0052] In step S4, the patterns of P1 and P2 droplets during casting include, but are not limited to, squares and circles, and their sizes include symmetrical ones that are the same or different. The settling time is 10 min to 20 min.

[0053] In step S5, the wires used to configure the metal electrodes are copper wires.

[0054] The present invention provides a light collection device based on ionized gelatin hydrogel droplets that undergoes a photochemical reaction under excitation light, has voltage output performance, and retains it after the light is removed. It can be applied in the fields of light collection, biomedicine, and flexible electronics.

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The various components of the embodiments of the present invention described and shown in the accompanying drawings can generally be configured and designed with various similar materials. The specific ratio of metal electrode and hydrogel functional layer materials needs to be optimized and determined according to the materials used in the device. The specific method for preparing the metal electrode adopts the existing magnetron sputtering technology in the art, and therefore will not be described in detail.

[0056] Example 1

[0057] This embodiment provides a light-collecting device based on ion-gelatin hydrogel droplets, the preparation method of which includes the following steps:

[0058] S1: The commercial flexible polyethylene terephthalate substrate was cleaned with deionized water and then surface modified in an air atmosphere using a plasma cleaner for 2 minutes to ensure enhanced adhesion to the magnetron sputtered metal electrode.

[0059] S2: A gold metal thin film was deposited on the substrate using magnetron sputtering as the metal electrode. The sputtering conditions were as follows: the working pressure was adjusted to 0.2 Pa in an argon atmosphere, followed by sputtering at a DC power of 5 W for 5 min. A 10 mm gap was left between the two metal electrodes for subsequent droplet casting of the hydrogel.

[0060] S3: Mix gelatin material with deionized water and ethylene glycol material in a mass ratio of 1.5:10:5, and dissolve at 45°C to obtain ordinary hydrogel droplet dispersion P1; mix gelatin material with deionized water, ammonium molybdate material and ethylene glycol material in a mass ratio of 1.5:10:0.5:5, and dissolve at 45°C to obtain photoresponsive hydrogel droplet dispersion P2.

[0061] S4: The ordinary hydrogel droplet dispersion P1 and the photoresponsive hydrogel droplet dispersion P2 are respectively drop-cast into the gap between the two metal electrodes on the substrate, ensuring that the two droplets are in contact with the gold electrodes on both sides, and that the interface between the two droplets is also in contact with each other; after the two droplets are cast, let them stand at room temperature for 15 minutes, and the effective volume of the hydrogel functional layer is 10mm×10mm×2mm.

[0062] S5: After the above steps, a light-collecting device based on ion-gelatin hydrogel droplets is finally obtained. Copper wires are then configured on the metal electrodes for performance testing.

[0063] like Figure 1 As shown, the light-collecting device based on ion-gelatin hydrogel droplets in this embodiment is arranged in sequence as follows: a substrate module, an electrode module, and a gelatin hydrogel functional layer module. The substrate module is a substrate 5. In this embodiment, the substrate 5 is a commercially available flexible polyethylene terephthalate substrate, used to provide a support for the placement and assembly of the electrodes and the gelatin hydrogel functional layer. The electrode module consists of a first metal electrode 1 and a second metal electrode 2, which are fabricated on the substrate 5 by magnetron sputtering. The two metal electrodes are identical. In this embodiment, the metal electrodes are made of gold and are used to convert the changes in charged particles generated by the photoexcitation of the hydrogel droplets into electrical output.

[0064] The gelatin hydrogel functional module includes a standard gelatin hydrogel droplet 3 and a photoresponsive gelatin hydrogel droplet 4. The standard gelatin hydrogel droplet is photostable, while the photoresponsive hydrogel droplet, when photoexcited, changes the concentration of surrounding charged particles and the redox potential. Therefore, upon excitation, an ion concentration gradient is generated between the standard hydrogel droplet and the photoresponsive hydrogel droplet, and the change in redox potential leads to a change in the counter electrode potential, thereby generating a voltage between the two metal electrodes.

[0065] Figure 2 This is a physical image of the light collection device based on ionized gelatin hydrogel droplets in this embodiment. Figure 3 These are images showing the liquid and solid states of ordinary hydrogel droplets and photoresponsive hydrogel droplets in the light-collecting device based on ionomer gelatin hydrogel droplets in this embodiment. Figure 2 As shown, the hydrogel droplet light collection device provided by the present invention includes a substrate, a metal electrode, and a gelatin hydrogel functional layer. Wherein:

[0066] The metal electrodes on the substrate were obtained using magnetron sputtering, with a gap left in the middle for subsequent droplet casting of the hydrogel. The gelatin hydrogel functional layer includes ordinary gelatin hydrogel droplets and photoresponsive gelatin hydrogel droplets. Both types of hydrogel droplets have flexible transition temperatures; they are liquid at 45°C and form a stable hydrogel network at room temperature after about 15 minutes, such as... Figure 3 As shown. Therefore, the light-collecting device can be assembled simply and flexibly using the drop casting method. When the hydrogel light-collecting device is excited by an excitation light field, the ammonium molybdate material in the photoresponsive hydrogel droplet undergoes a photochemical process upon photoexcitation, generating negatively charged particles; while ordinary gelatin hydrogel droplets are photostable. Therefore, an ion concentration difference is formed between the two hydrogel droplets, and due to the change in the valence state of molybdenum, the redox potential of the counter electrode changes. Thus, under the combined effect of the ion concentration difference and the redox potential of the counter electrode, a voltage output is generated across the metal electrode.

[0067] Example 2

[0068] This embodiment provides a method for preparing a light collection device based on ionized gelatin hydrogel droplets, which is the same as the preparation method in Embodiment 1. The only difference is that the metal electrode material deposited in step S2 is copper, and the sputtering conditions are to adjust the working pressure to 0.0005 Pa in an argon atmosphere, followed by sputtering at a DC power of 40W for 20 min.

[0069] Example 3

[0070] This embodiment provides a method for preparing a light-collecting device based on ionized gelatin hydrogel droplets, which is the same as the preparation method in Example 1, except that the effective volume of the hydrogel functional layer in step S4 is 5mm×1mm×2mm.

[0071] Example 4

[0072] This embodiment provides a method for preparing a light collection device based on ionized gelatin hydrogel droplets, which is the same as the preparation method in Example 1, except that the effective volume of the hydrogel functional layer in step S4 is 20mm×20mm×2mm.

[0073] Figure 4 The photoexcitation voltage output performance of the light-collecting devices based on ion-gelatin hydrogel droplets prepared in Examples 1 and 2 is tested under different electrodes (photoexcitation power density is 5.7 mW / cm²). 2 (wavelength is 365nm); Figure 5 The graphs show the photoexcitation voltage output performance of the light-collecting device based on ionomer gelatin hydrogel droplets prepared in Examples 1 and 3-4 of this invention at different volume sizes (photoexcitation power density is 5.7 mW / cm²). 2 (wavelength is 365nm). For example Figure 4 As shown, after the device voltage reaches a steady state under excitation light, the gold electrode device in Example 1 can generate an output voltage of 250mV, and the copper electrode device in Example 2 can generate an output voltage of 80mV. It should be noted that, thanks to the changes in ion diffusion and redox pairs in the hydrogel functional layer, it still has voltage output within 1 hour after the light irradiation is removed. Figure 5 The results show that flexible hydrogel droplets can be used to create units of any volume, and the output performance remains at 250mV even when the device size differs by eighty times.

[0074] Furthermore, the light-harvesting device can be further improved in performance through simple series or parallel connections, and can be used as a bioelectronic device. The output power can be used for the repair of epidermal damage in organisms, such as... Figure 6 As shown, the light-collecting device based on ionized gelatin hydrogel droplets prepared in Example 1 was placed on the damaged biological epidermis. The results showed that, compared with the control group using medical gauze, the damaged biological epidermis covered with the light-collecting device repaired faster, and the repaired edges were smooth with almost no visible damage outline.

[0075] Therefore, the present invention proposes a light-collecting device based on ion-gelatin hydrogel droplets and its preparation method, which combines gelatin hydrogel materials and photoresponsive materials. The light-collecting device can be realized by simple and flexible hydrogel droplet casting assembly. It has the advantages of energy conversion, good biocompatibility and system simplicity. It can realize light collection and support the manufacture of units of arbitrary size or shape, solving the difficulties of traditional light-collecting devices such as system complexity, high cost and poor biocompatibility.

[0076] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and does not limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A light-collecting device based on ion-gelatin hydrogel droplets, characterized in that, It includes an electrode module and a gelatin hydrogel functional layer sequentially disposed on the base module; The substrate module is a substrate sheet, which can be either a flexible substrate sheet or a rigid substrate sheet. The electrode module consists of metal electrodes disposed on both sides of the gelatin hydrogel functional layer. The gelatin hydrogel functional layer includes ordinary hydrogel droplets and photoresponsive hydrogel droplets; Ordinary hydrogel droplets and photoresponsive hydrogel droplets are obtained by drop-casting ordinary hydrogel droplet dispersions and photoresponsive hydrogel droplet dispersions onto the gap between two metal electrodes on a substrate, ensuring that both types of droplets are in contact with the metal electrodes on both sides, and that the interface between the two types of droplets is also in contact with each other; after drop-casting, they are allowed to stand at room temperature. In a typical hydrogel droplet dispersion, the mass ratio of gelatin material, deionized water, and alcohol material is (1-3):10:(2-8), wherein the alcohol material is any one of ethylene glycol, glycerol, and ethanol. In the photoresponsive hydrogel droplet dispersion, the mass ratio of gelatin material, deionized water, photoresponsive material, and alcohol material is (1-3):10:(0.2-0.8):(2-8); The photoresponsive material is any one of ammonium molybdate, tungstic acid, ammonium tungstate, or polyoxometalates other than ammonium and tungsten metals; the polyol material is any one of ethylene glycol, glycerol, or ethanol; the dissolution temperature is 40℃-50℃, and the heating method is a water bath.

2. The method for preparing a light-collecting device based on ion-gelatin hydrogel droplets according to claim 1, characterized in that, Includes the following steps: S1. Clean the substrate with deionized water and modify its surface using a plasma cleaner. S2. Deposit a metal thin film on the substrate using a coating technique or attach a metal sheet to the substrate as a metal electrode, leaving a gap between the two metal electrodes for subsequent droplet casting of hydrogel. S3. Mix gelatin material with deionized water and alcohol material to obtain ordinary hydrogel droplet dispersion P1; mix gelatin material with deionized water, photoresponsive material and alcohol material to obtain photoresponsive hydrogel droplet dispersion P2. S4. Drop casting of ordinary hydrogel droplet dispersion P1 and photoresponsive hydrogel droplet dispersion P2 onto the gap between the two metal electrodes on the substrate, ensuring that the two droplets are in contact with the electrodes on both sides and that the middle interface of the two droplets is also in contact with each other; after the drop casting is completed, let it stand at room temperature. S5. Wires are configured on the two metal electrodes respectively to finally obtain a light collection device based on ion gelatin hydrogel droplets.

3. The method for preparing a light-collecting device based on ion-gelatin hydrogel droplets according to claim 2, characterized in that, In step S1, the substrate is either flexible polyethylene terephthalate or rigid glass.

4. The method for preparing a light-collecting device based on ion-gelatin hydrogel droplets according to claim 2, characterized in that, In step S2, the metal electrode is any one of gold, copper, platinum, silver, or zinc, and a gap of 5 mm to 40 mm is retained in the middle of the metal electrode.

5. In the preparation method of the light collection device based on ion gelatin hydrogel droplets according to claim 2, the standing time in step S4 is 10 min-20 min.

6. In the method for preparing a light collection device based on ionized gelatin hydrogel droplets according to claim 2, in step S5, the wires used to configure the metal electrodes are copper wires.

7. The application of the light-collecting device based on ion-gelatin hydrogel droplets according to claim 1, characterized in that, The light-collecting device undergoes a photochemical reaction under excitation light, exhibits voltage output performance, and retains this performance after the light is removed. It is applied in the fields of light collection, biomedicine, and flexible electronics.

Images