A photoelectrochemical-assisted dehumidification device driven by a shadow effect

Abstract

The present application relates to the field of dehumidification, in particular to a photoelectrochemical auxiliary dehumidification device driven by shadow effect, the upper layer is super-hygroscopic hydrogel, the middle layer is photoelectrochemical cell, and the lower layer is shadow effect device; in the photoelectrochemical auxiliary dehumidification system provided by the present application, the moisture absorbed by the hydrogel is rapidly decomposed by the photoelectrochemical cell with enhanced voltage generated by the shadow effect device. The absorption of atmospheric moisture by the hydrogel and the voltage generated by the light contrast difference of the shadow effect device caused by the transparent photoanode of the photoelectrochemical cell from the upper layer and the light-tight photocathode result in continuous dehumidification of the closed space under zero energy input, the relative humidity in the room can be maintained below 70% without additional energy input, and a certain stable current is generated, which improves the efficiency of the dehumidification system and reduces energy consumption, and has wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dehumidification, in particular to a photoelectrochemical auxiliary dehumidification device driven by shadow effect. BACKGROUND

[0002] Air humidity plays a crucial role in human health, equipment life, and goods preservation. High humidity environments have many hazards to human life. Long-term exposure to high humidity environments in natural environments can cause basic metabolic disorders and pathological changes in physiological functions. Metal machines, electronic devices, and precision manufacturing facilities working in high humidity environments can be corroded, causing machines to rust and even be damaged, which can affect product quality and pose safety hazards. Excessive humidity can also cause wall peeling, furniture damage, and bacterial growth. Therefore, in high relative humidity environments, air dehumidification is crucial and has important significance for environmental sustainability and human health.

[0003] Traditional air dehumidification methods include ventilation dehumidification, heating dehumidification, and condensation dehumidification, etc. These methods usually have the disadvantages of low efficiency or high energy consumption. Ventilation dehumidification refers to introducing dry air from the outside while expelling relatively humid air outside. However, it is low in efficiency and limited by weather and space; heating dehumidification refers to heating air through a heater. Heating dehumidification is relatively efficient, convenient, and simple, but it is only suitable for situations where the indoor temperature requirement is not high. In addition, heating dehumidification has relatively high energy consumption when increasing air temperature; condensation dehumidification uses a refrigeration machine to cool the air. When the air temperature is below the dew point, the water vapor in the air will condense. Condensation dehumidification works stably and continuously, but requires a refrigeration machine to provide cold water, which has high energy consumption and high equipment cost; desiccant dehumidification technology uses hygroscopic materials to absorb moisture from the air for dehumidification. However, once these hygroscopic materials absorb water, they must be desorbed by external energy input.

[0004] Patent technology document CN108786342B discloses a dust and dehumidification air purification device, which includes a gas washing chamber, a treatment water circulation device, a dehumidification device, and an electrostatic treatment chamber. Dust is removed by the gas washing chamber, dehumidification is performed by the dehumidification device, and then deep purification is performed by the electrostatic treatment chamber, thereby realizing dust and dehumidification purification treatment of air. Through specific settings of each device, secondary pollution to the environment is avoided, but the device has low efficiency and high energy consumption. Therefore, according to the related technology in the above, there is an urgent need to develop a photoelectrochemical auxiliary dehumidification device driven by shadow effect. SUMMARY

[0005] Therefore, the present application aims to provide a photoelectrochemical auxiliary dehumidification device driven by shadow effect to solve the problems of low efficiency and high energy consumption of existing dehumidification devices.

[0006] Based on the above purpose, the application provides a photoelectrochemical auxiliary dehumidification device driven by shadow effect.

[0007] A photoelectrochemical auxiliary dehumidification device driven by shadow effect, wherein an upper layer is superabsorbent hydrogel, a middle layer is a photoelectrochemical cell, and a lower layer is a shadow effect device.

[0008] The superabsorbent hydrogel is cobalt-based hydrogel.

[0009] The photoelectrochemical cell is composed of a photoanode and a photocathode.

[0010] The photoanode is tin dioxide-bismuth vanadate, and the photocathode is platinum.

[0011] Preferably, the preparation method of the cobalt-based hydrogel is as follows:

[0012] Step A1: Dissolve cobalt dichloride hexahydrate in 2-methoxyethanol, and ultrasonically treat for 30-35 min to obtain a cobalt chloride solution;

[0013] Step A2: Add ethanolamine to the cobalt chloride solution, continue to ultrasonically treat for 30-35 min, then add deionized water, mix and vigorously shake for 1-2 min to obtain cobalt-based hydrogel.

[0014] Preferably, the ratio of the amount of cobalt dichloride hexahydrate to 2-methoxyethanol in step A1 is 0.7-0.8 g:5-6 mL.

[0015] Preferably, the volume ratio of the ethanolamine, the cobalt chloride solution and the deionized water in step A2 is 0.2-0.3:5-6:10-12.

[0016] Preferably, the preparation method of the photoanode is as follows:

[0017] Step B1: Dissolve tin chloride pentahydrate in 2-methoxyethanol, and ultrasonically treat for 30-35 min to obtain a tin dioxide spin coating solution;

[0018] Step B2: Dissolve bismuth nitrate(III) pentahydrate and vanadyl acetylacetonate in a mixed solvent of acetic acid, 2-methoxyethanol and methanol, stir for 30-35 min, and ultrasonically treat for 30-40 min to obtain a bismuth vanadate spin coating solution;

[0019] Step B3: Spin coat the tin dioxide spin coating solution and the bismuth vanadate spin coating solution on a fluorine-doped tin oxide substrate in sequence at a rotation speed of 3000-3500 rpm for 40-45 s, and after the spin coating of each layer is completed, perform intermediate annealing on a heating plate at 350℃ for 5-10 min, and finally perform annealing at 450℃ for 1-1.5 h to obtain the photoanode.

[0020] Preferably, the tin tetrachloride pentahydrate and 2-methoxyethanol in step B1 are used in a ratio of 0.6-0.7g:1-2mL.

[0021] Preferably, the bismuth(III) nitrate pentahydrate, vanadyl acetylacetonate, acetic acid, 2-methoxyethanol and methanol in step B2 are used in a ratio of 0.4-0.6g:0.2-0.3g:1-3mL:7-9mL:1-3mL.

[0022] Preferably, the shadow effect device is prepared as follows:

[0023] Step C1: the n-type silicon wafer is washed with ethanol, isopropyl alcohol and water in sequence to obtain a silicon substrate;

[0024] Step C2: the silicon substrate is dried with nitrogen, and a 1cm copper tape is pasted as a spacer at the center of the silicon substrate, then platinum is deposited using a magnetron sputtering method to obtain a shadow effect device.

[0025] Preferably, the length of the silicon substrate in step C1 is 5cm, and the width is 1cm.

[0026] Preferably, the length of the copper tape in step C2 is 1cm, and the width is 1cm.

[0027] The radio frequency power in the magnetron sputtering method in step C2 is 80-85W, and the sputtering time is 70-80s.

[0028] Advantages of the present application:

[0029] The cobalt-based hydrogel coated on the uppermost layer of the system captures moisture from the surrounding humid air; the middle component is a planar photoelectrochemical cell, and the photoanode and cathode thereof are prepared on fluorine-doped tin oxide glass by spin coating and magnetron sputtering, respectively. The tin dioxide-bismuth vanadate film serves as the photoanode of the photoelectrochemical cell and absorbs light to generate holes for water oxidation. The lightproof magnetron sputtered platinum film serves as the cathode of the photoelectrochemical cell and also casts a shadow on the shadow effect device; the lowermost component is the shadow effect device, which generates a voltage according to the difference in work function of the metal electrode under light and dark conditions, so the light-to-dark contrast difference of the transparent photoanode and the dark photoanode of the photoelectrochemical cell on the shadow effect device below can lead to the voltage of the shadow effect device, thereby enhancing the photoelectrochemical catalysis of the photoelectrochemical cell.

[0030] The photoelectrochemical auxiliary dehumidification system provided by the application can rapidly decompose the water absorbed by the hydrogel by the photoelectrochemical cell with the voltage enhanced by the shadow effect device. The absorption of atmospheric water by the hydrogel and the voltage generated by the light contrast difference of the transparent photoanode and the lightproof photocathode of the photoelectrochemical cell from the photoelectrochemical cell above cause continuous dehumidification of the closed space without energy input, so that the relative humidity in the room can be kept below 70% without additional energy input, a certain stable current is generated, the efficiency of the dehumidification system is improved, and the energy consumption is reduced, so that the application prospect is wide. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only illustrate the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0032] Figure 1 It is a structural schematic diagram of the shadow effect driven photoelectrochemical auxiliary dehumidification system in the application.

[0033] Figure 2 It is a scanning electron microscope diagram of the tin dioxide-bismuth vanadate photoanode in the application.

[0034] Figure 3 It is a relationship diagram of the photocurrent density and the potential of the tin dioxide-bismuth vanadate photoanode in 0.5M potassium borate buffer (pH9.5) under standard light conditions (100mW / cm -2 ), and the built-in diagram is the J-t curve diagram of the tin dioxide-bismuth vanadate at 1.23V vs.RHE.

[0035] Figure 4 It is an applied bias voltage photo-electric conversion efficiency curve diagram of the tin dioxide-bismuth vanadate photoanode in the application.

[0036] Figure 5 It is a light transmittance comparison diagram of the cobalt-based hydrogel in Example 1 and the zinc-based hydrogel in Comparative Example 1 in the application.

[0037] Figure 6 It is a water absorption amount diagram of the cobalt-based hydrogel in Example 1 and the zinc-based hydrogel in Comparative Example 1 in the application under 80% relative humidity for 7 hours.

[0038] Figure 7 It is a water absorption rate diagram of the cobalt-based hydrogel in Example 1 and the zinc-based hydrogel in Comparative Example 1 in the application exposed to 80% relative humidity for 7 hours.

[0039] Figure 8 Figure 1 is a relative humidity change diagram of a glass chamber in the photoelectrochemical auxiliary dehumidification device driven by the shadow effect in a simulated indoor environment. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with specific examples.

[0041] The sources and properties of some raw materials used in the present application are as follows:

[0042] Cobalt dichloride hexahydrate was purchased from Wuhan Chujiang Haoyu Chemical Technology Development Co., Ltd.; tin tetrachloride pentahydrate was purchased from Nanjing Chemical Reagent Co., Ltd.; bismuth (III) nitrate pentahydrate was purchased from Shanghai Jetseike Biological Technology Co., Ltd.; vanadyl acetylacetonate was purchased from Shanghai Kolaman Reagent Co., Ltd.; 2-methoxyethanol was purchased from Shandong Zhengxing New Material Co., Ltd.

[0043] Example 1: A photoelectrochemical auxiliary dehumidification device driven by the shadow effect, comprising the following steps:

[0044] S1: Dissolve 0.7 g of cobalt dichloride hexahydrate in 5 mL of 2-methoxyethanol, and ultrasonically treat for 30 min to obtain a cobalt chloride solution;

[0045] S2: Add 0.2 mL of ethanolamine to 5 mL of the cobalt chloride solution, continue to ultrasonically treat for 30-35 min, then add 10 mL of deionized water, mix and vigorously shake for 1 min to obtain a cobalt-based hydrogel;

[0046] S3: Dissolve 0.6 g of tin tetrachloride pentahydrate in 1 mL of 2-methoxyethanol, and ultrasonically treat for 30 min to obtain a tin dioxide spin-coating solution;

[0047] S4: Dissolve 0.4-0.6 g of bismuth (III) nitrate pentahydrate and 0.2-0.3 g of vanadyl acetylacetonate in a mixed solvent of 1-3 mL of acetic acid, 7-9 mL of 2-methoxyethanol and 1-3 mL of methanol, stir for 30-35 min, and ultrasonically treat for 30-40 min to obtain a bismuth vanadate spin-coating solution;

[0048] S5: Spin-coat the tin dioxide spin-coating solution and the bismuth vanadate spin-coating solution on a fluorine-doped tin oxide substrate in turn at a speed of 3000 rpm for 40 s, after each spin-coating is completed, perform intermediate annealing on a hot plate at 350℃ for 5 min, and finally perform annealing at 450℃ for 1 h to obtain a photoanode;

[0049] S6: Assemble the photoanode and a photocathode to form a photoelectrochemical cell, wherein the photocathode is a platinum electrode;

[0050] S7: The n-type silicon wafer is successively rinsed with ethanol, isopropanol and water to obtain a silicon substrate, wherein the length of the silicon substrate is 5 cm and the width is 1 cm.

[0051] S8: The silicon substrate is dried with nitrogen and a copper tape is pasted as a spacer at the center of the silicon substrate, and then platinum deposition is performed using a magnetron sputtering method to obtain a shadow effect device, wherein the length of the copper tape is 1 cm and the width is 1 cm, the radio frequency power in the magnetron sputtering method is 80 W, and the sputtering time is 70 s;

[0052] S9: The superabsorbent hydrogel is uniformly coated on the photoelectrochemical cell as an upper layer, and the shadow effect device is the lower layer, and the shadow effect device is connected with the photoelectrochemical cell by a copper wire to obtain a shadow effect driven photoelectrochemical auxiliary dehumidification device.

[0053] Embodiment 2: A shadow effect driven photoelectrochemical auxiliary dehumidification device, comprising the following steps:

[0054] S1: 0.72 g of cobalt dichloride hexahydrate is dissolved in 5.2 mL of 2-methoxyethanol, and ultrasonic treatment is performed for 32 min to obtain a cobalt chloride solution;

[0055] S2: 0.22 mL of ethanolamine is added to 5.2 mL of the cobalt chloride solution, and ultrasonic treatment is continued for 32 min, and then 10.4 mL of deionized water is added and shaken vigorously for 1.2 min to obtain a cobalt-based hydrogel;

[0056] S3: 0.62 g of tin tetrachloride pentahydrate is dissolved in 1.2 mL of 2-methoxyethanol, and ultrasonic treatment is performed for 32 min to obtain a tin dioxide spin coating solution;

[0057] S4: 0.45 g of bismuth (III) nitrate pentahydrate and 0.22 g of vanadyl acetylacetonate are dissolved in a mixed solvent of 1.5 mL of acetic acid, 7.5 mL of 2-methoxyethanol and 1.5 mL of methanol, and stirred for 31 min, and ultrasonic treatment is performed for 32 min to obtain a bismuth vanadate spin coating solution;

[0058] S5: The tin dioxide spin coating solution and the bismuth vanadate spin coating solution are successively spin-coated on a fluorine-doped tin oxide substrate at a speed of 3200 rpm for 41 s, and after each layer of spin coating is completed, intermediate annealing is performed on a heating plate at 350°C for 6 min, and final annealing is performed at 450°C for 1.2 h to obtain a photoanode;

[0059] S6: The photoanode and a photocathode are assembled into a photoelectrochemical cell, wherein the photocathode is a platinum electrode;

[0060] S7: The n-type silicon wafer is successively rinsed with ethanol, isopropanol and water to obtain a silicon substrate, wherein the length of the silicon substrate is 5 cm and the width is 1 cm.

[0061] S8: drying the silicon substrate with nitrogen and pasting a 1cm copper tape as a spacer at the center of the silicon substrate, and then depositing platinum using a magnetron sputtering method to obtain a shadow effect device, wherein the length of the copper tape is 1cm and the width is 1cm, wherein the radio frequency power source power in the magnetron sputtering method is 82W and the sputtering time is 74s;

[0062] S9: uniformly coating the superabsorbent hydrogel on the photoelectrochemical cell as an upper layer, and the shadow effect device as a lower layer, and connecting the shadow effect device and the photoelectrochemical cell with a copper wire to obtain a shadow effect driven photoelectrochemical auxiliary dehumidification device.

[0063] Embodiment 3: a shadow effect driven photoelectrochemical auxiliary dehumidification device, comprising the following steps:

[0064] S1: dissolving 0.75g of cobalt dichloride hexahydrate in 5.5mL of 2-methoxyethanol, and ultrasonic treating for 33min to obtain a cobalt chloride solution;

[0065] S2: adding 0.25mL of ethanolamine to 5.5mL of the cobalt chloride solution, continuing to ultrasonic treat for 33min, and then adding 11mL of deionized water and mixing and vigorously shaking for 1.5min to obtain a cobalt-based hydrogel;

[0066] S3: dissolving 0.65g of tin tetrachloride pentahydrate in 1.5mL of 2-methoxyethanol, and ultrasonic treating for 33min to obtain a tin dioxide spin coating solution;

[0067] S4: dissolving 0.5g of bismuth(III) nitrate pentahydrate and 0.25g of vanadyl acetylacetonate in 2mL of acetic acid, 8mL of 2-methoxyethanol and 2mL of methanol mixed solvent, stirring for 32min, and ultrasonic treating for 35min to obtain a bismuth vanadate spin coating solution;

[0068] S5: spin coating the tin dioxide spin coating solution and the bismuth vanadate spin coating solution on the fluorine-doped tin oxide substrate in turn at a speed of 3300rpm for 42s, and after each layer of spin coating is completed, intermediate annealing is performed on a heating plate at 350℃ for 7min, and final annealing is performed at 450℃ for 1.3h to obtain a photoanode;

[0069] S6: assembling the photoanode and a photocathode into a photoelectrochemical cell, wherein the photocathode is a platinum electrode;

[0070] S7: rinsing the n-type silicon wafer with ethanol, isopropyl alcohol and water in sequence to obtain a silicon substrate, wherein the length of the silicon substrate is 10cm and the width is 5cm.

[0071] S8: Dry the silicon substrate with nitrogen and paste a 1 cm copper tape as a spacer at the center of the silicon substrate, then deposit platinum using a magnetron sputtering method to obtain a shadow effect device, wherein the length of the copper tape is 5 cm and the width is 0.5 cm, wherein the radio frequency power source power in the magnetron sputtering method is 83 W and the sputtering time is 76 s;

[0072] S9: Uniformly coat the superabsorbent hydrogel on the photoelectrochemical cell as the upper layer, and the shadow effect device as the lower layer, and connect the shadow effect device and the photoelectrochemical cell with a copper wire to obtain a shadow effect driven photoelectrochemical assisted dehumidification device.

[0073] Embodiment 4: A shadow effect driven photoelectrochemical assisted dehumidification device, comprising the following steps:

[0074] S1: Dissolve 0.77 g of cobalt dichloride hexahydrate in 5.7 mL of 2-methoxyethanol, and ultrasonically treat for 34 min to obtain a cobalt chloride solution;

[0075] S2: Add 0.27 mL of ethanolamine to 5.7 mL of the cobalt chloride solution, continue to ultrasonically treat for 34 min, and then add 11.4 mL of deionized water, mix and vigorously shake for 1.7 min to obtain a cobalt-based hydrogel;

[0076] S3: Dissolve 0.68 g of tin tetrachloride pentahydrate in 1.8 mL of 2-methoxyethanol, and ultrasonically treat for 34 min to obtain a tin dioxide spin coating solution;

[0077] S4: Dissolve 0.58 g of bismuth (III) nitrate pentahydrate and 0.28 g of vanadyl acetylacetonate in a mixed solvent of 2.8 mL of acetic acid, 8.5 mL of 2-methoxyethanol and 2.8 mL of methanol, stir for 34 min, and ultrasonically treat for 38 min to obtain a bismuth vanadate spin coating solution;

[0078] S5: Spin coat the tin dioxide spin coating solution and the bismuth vanadate spin coating solution on the fluorine-doped tin oxide substrate in turn at a speed of 3400 rpm for 44 s, and after each layer of spin coating is completed, intermediate annealing is performed on a heating plate at 350°C for 8 min, and final annealing is performed at 450°C for 1.4 h to obtain a photoanode;

[0079] S6: Assemble the photoanode and a photocathode into a photoelectrochemical cell, wherein the photocathode is a platinum electrode;

[0080] S7: Rinse the n-type silicon wafer with ethanol, isopropanol and water in sequence to obtain a silicon substrate, wherein the length of the silicon substrate is 5 cm and the width is 1 cm.

[0081] S8: Dry the silicon substrate with nitrogen, and paste a 1cm copper tape as a spacer at the center of the silicon substrate, then deposit platinum using a magnetron sputtering method, to obtain a shadow effect device, wherein the length of the copper tape is 1cm, the width is 1cm, wherein the radio frequency power in the magnetron sputtering method is 84W, and the sputtering time is 78s;

[0082] S9: Uniformly coat the superabsorbent hydrogel on the photoelectrochemical cell as the upper layer, and the shadow effect device as the lower layer, and connect the shadow effect device and the photoelectrochemical cell with a copper wire, to obtain a shadow effect driven photoelectrochemical auxiliary dehumidification device.

[0083] Embodiment 5: A shadow effect driven photoelectrochemical auxiliary dehumidification device, comprising the following steps:

[0084] S1: Dissolve 0.8g of cobalt dichloride hexahydrate in 6mL of 2-methoxyethanol, and ultrasonically treat for 35min to obtain a cobalt chloride solution;

[0085] S2: Add 0.3mL of ethanolamine to 6mL of the cobalt chloride solution, continue to ultrasonically treat for 35min, then add 12mL of deionized water, mix and shake vigorously for 2min to obtain a cobalt-based hydrogel;

[0086] S3: Dissolve 0.7g of tin tetrachloride pentahydrate in 2mL of 2-methoxyethanol, and ultrasonically treat for 35min to obtain a tin dioxide spin coating solution;

[0087] S4: Dissolve 0.6g of bismuth(III) nitrate pentahydrate and 0.3g of vanadyl acetylacetonate in 3mL of acetic acid, 9mL of 2-methoxyethanol and 3mL of methanol mixed solvent, stir for 35min, and ultrasonically treat for 40min to obtain a bismuth vanadate spin coating solution;

[0088] S5: Spin coat the tin dioxide spin coating solution and the bismuth vanadate spin coating solution on the fluorine-doped tin oxide substrate in turn at a speed of 3500rpm for 45s, after each layer of spin coating is completed, intermediate annealing is performed on a heating plate at 350℃ for 10min, and final annealing is performed at 450℃ for 1.5h to obtain a photoanode;

[0089] S6: Assemble the photoanode and a photocathode into a photoelectrochemical cell, wherein the photocathode is a platinum electrode;

[0090] S7: Rinse the n-type silicon wafer with ethanol, isopropyl alcohol and water in sequence to obtain a silicon substrate, wherein the length of the silicon substrate is 5cm, and the width is 1cm.

[0091] S8: Dry the silicon substrate with nitrogen, and paste a 1cm copper tape as a spacer at the center of the silicon substrate, then deposit platinum using a magnetron sputtering method, to obtain a shadow effect device, wherein the length of the copper tape is 1cm, and the width is 1cm, wherein the radio frequency power in the magnetron sputtering method is 85W, and the sputtering time is 80s;

[0092] S9: The superabsorbent hydrogel is uniformly coated on the photoelectrochemical cell as an upper layer, and the shadow effect device is the lower layer, and the shadow effect device is connected with the photoelectrochemical cell by a copper wire, to obtain a shadow effect driven photoelectrochemical auxiliary dehumidification device.

[0093] Comparative Example 1:

[0094] This comparative example only replaces the "cobalt-based hydrogel" with a "zinc-based hydrogel" compared with Example 1, and the rest of the steps and parameters are the same, and this comparative example will not be repeated. The final shadow effect driven photoelectrochemical auxiliary dehumidification device is obtained.

[0095] Performance test:

[0096] The water oxidation performance of the photoelectrode prepared in Example 1 was evaluated in a photoelectrochemical cell in 0.5M potassium borate buffer under simulated sunlight under standard light conditions (100mW / cm -2 ), as shown in Figure 3 , the tin dioxide-bismuth vanadate photoanode showed a photocurrent of 2.33mA / cm 2 at 1.23V vs. RHE, and the onset potential was 0.30V vs. RHE, indicating that the photoelectrochemical cell prepared by the application has good photoelectrocatalytic performance.

[0097] In order to study the reversibility and stability of the photoanode, the transient photocurrent density was recorded at a constant voltage of 1.23V vs. RHE under chopped illumination, and the photoelectrochemical cell prepared in Example 1 showed fast switching light characteristics, which was consistent with the linear sweep voltammetry results. According to the linear sweep voltammetry curve, the applied bias photocurrent conversion efficiency (ABPE) of the tin dioxide-bismuth vanadate photoanode was calculated, as shown in Figure 4 , the tin dioxide-bismuth vanadate photoanode achieved a maximum ABPE value of 0.37% at 0.93V vs. RHE.

[0098] The hydrogel is used to absorb water in humid air to provide water source for the photoelectrochemical cell, Figure 5 The transmittance of the cobalt-based hydrogel in Example 1 and the zinc-based hydrogel in Comparative Example 1 is shown in the figure, and it can be seen from the figure that in the 300-900nm waveband, the transmittance of the cobalt-based hydrogel is always higher than that of the zinc-based hydrogel.

[0099] The water absorption performance of the cobalt-based hydrogel in Example 1 and the zinc-based hydrogel in Comparative Example 1 was tested in a constant humidity environment with a relative humidity of 80%, and the change in weight over time was recorded, as shown in Figure 6 As shown, the zinc-based hydrogel and the cobalt-based hydrogel can absorb 577.7 mg and 392.2 mg of water, respectively, in 7 hours, and the cobalt-based hydrogel has a much higher water absorption than the zinc-based hydrogel in the same time. Figure 7 As shown, the weight change of the cobalt-based hydrogel is more than 230 mg, about 0.85 times the weight of the dry hydrogel, and has a higher water absorption performance than the zinc-based hydrogel.

[0100] In order to evaluate the dehumidification effect of the shadow effect driven photoelectrochemical assisted dehumidification device, the shadow effect driven photoelectrochemical assisted dehumidification device prepared in Example 1 and a hygrometer were placed in a glass chamber with a volume of 700 ml, and the change in humidity of the glass chamber was observed, as shown in Figure 8 As shown, in the presence of the dehumidification device, the RH in the glass chamber decreased by 13.5% only after 80 min. The RH eventually decreased to 67% (the relative humidity of ideal thermal comfort) and was basically maintained in the glass chamber, indicating that the dehumidification effect of the prepared dehumidification device was good.

[0101] It should be understood by those skilled in the art that the above discussion of any of the embodiments is only exemplary and is not intended to imply that the scope of the present application is limited to these examples; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in details.

[0102] The present application is intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Accordingly, any and all such modifications, variations, omissions, and equivalents are intended to be encompassed by the present application.

Claims

1. A shadow effect-driven photoelectrochemical-assisted dehumidification device, characterized in that, The shadow effect-driven photoelectrochemical-assisted dehumidification device consists of a super-hygroscopic hydrogel on the upper layer, a photoelectrochemical cell in the middle layer, and a shadow effect device on the lower layer. The superhygroscopic hydrogel is a cobalt-based hydrogel; The photoelectrochemical cell consists of a transparent photoanode and an opaque photocathode. The photoanode is bismuth vanadate with tin dioxide, and the photocathode is platinum. The method for preparing the photoanode is as follows: Step B1: Dissolve tin tetrachloride pentahydrate in 2-methoxyethanol and sonicate for 30-35 min to obtain tin dioxide spin-coating solution; Step B2: Dissolve bismuth(III) nitrate pentahydrate and acetylacetonate vanadate in a mixed solvent of acetic acid, 2-methoxyethanol and methanol, stir for 30-35 min, and sonicate for 30-40 min to obtain bismuth vanadate spin-coating solution. Step B3: Spin coat the tin dioxide spin coating solution and the bismuth vanadate spin coating solution onto the fluorine-doped tin oxide substrate in sequence at a speed of 3000-3500 rpm for 40-45 seconds. After each layer is spin coated, perform intermediate annealing on a heating plate at 350°C for 5-10 minutes. Finally, perform annealing at 450°C for 1-1.5 hours to obtain the photoanode. The fabrication method of the shadow effect device is as follows: Step C1: The n-type silicon wafer is continuously rinsed with ethanol, isopropanol and water to obtain a silicon substrate; Step C2: Dry the silicon substrate with nitrogen and attach a copper strip as a spacer at the center of the silicon substrate. Then, perform platinum deposition using magnetron sputtering to obtain the shadow effect device.

2. The shadow effect-driven photoelectrochemical-assisted dehumidification device according to claim 1, characterized in that, The cobalt-based hydrogel is prepared as follows: Step A1: Dissolve cobalt dichloride hexahydrate in 2-methoxyethanol and sonicate for 30-35 min to obtain a cobalt chloride solution; Step A2: Add ethanolamine to the cobalt chloride solution, continue sonication for 30-35 minutes, then add deionized water, mix and shake vigorously for 1-2 minutes to obtain cobalt-based hydrogel.

3. The shadow effect-driven photoelectrochemical-assisted dehumidification device according to claim 2, characterized in that, The ratio of cobalt dichloride hexahydrate to 2-methoxyethanol used in step A1 is 0.7-0.8 g : 5-6 mL.

4. The shadow effect-driven photoelectrochemical-assisted dehumidification device according to claim 2, characterized in that, The volume ratio of ethanolamine, cobalt chloride solution and deionized water in step A2 is 0.2-0.3:5-6:10-12.

5. The shadow effect-driven photoelectrochemical-assisted dehumidification device according to claim 1, characterized in that, The ratio of tin tetrachloride pentahydrate to 2-methoxyethanol used in step B1 is 0.6-0.7g:1-2mL.

6. The shadow effect-driven photoelectrochemical-assisted dehumidification device according to claim 1, characterized in that, The ratio of bismuth(III) nitrate pentahydrate, acetylacetonate vanadyl, acetic acid, 2-methoxyethanol and methanol used in step B2 is 0.4-0.6g: 0.2-0.3g: 1-3mL: 7-9mL: 1-3mL.

7. The shadow effect-driven photoelectrochemical-assisted dehumidification device according to claim 1, characterized in that, The silicon substrate mentioned in step C1 has a length of 5 cm and a width of 1 cm.

8. The shadow effect-driven photoelectrochemical-assisted dehumidification device according to claim 1, characterized in that, The copper strip mentioned in step C2 has a length of 1cm and a width of 1cm; The RF power supply in the magnetron sputtering method described in step C2 is 80-85W, and the sputtering time is 70-80s.

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