Electrolytic hydrogen production device and hydrogen production method thereof

Abstract

The invention provides an electrolytic hydrogen production device and a hydrogen production method thereof. The electrolytic hydrogen production device comprises a gas flow control conduction unit, an electrolytic hydrogen production unit, a power supply unit and a gas collection unit, the gas flow control conduction unit is used for introducing air and increasing the flow, and treated air is obtained and then transmitted; the electrolytic hydrogen production unit comprises an electrolytic cell and a moisture absorption unit, the electrolytic cell comprises an electrode unit, the moisture absorption unit is arranged in the electrolytic cell, one end of the electrode unit extends into the moisture absorption unit, and the moisture absorption unit is used for absorbing moisture in the treated air by adopting a moisture absorption material containing electrolyte to obtain an electrolyte solution; meanwhile, water is continuously supplemented to the electrolyte solution; the electrode unit is used for electrolyzing the electrolyte solution to obtain hydrogen and oxygen; the power supply unit is used for supplying power to the electrode unit; the gas collecting unit is used for collecting hydrogen and oxygen. The system makes full use of air, gets rid of dependence of water electrolysis hydrogen production on water resources, and realizes hydrogen production in arid regions and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic hydrogen production, and in particular to an electrolytic hydrogen production device and a hydrogen production method thereof. Background Art

[0002] Green hydrogen is one of the core energy carriers of the future low-carbon economy. By combining renewable energy (such as solar energy and wind energy) with water electrolysis hydrogen production technology, zero-carbon emission energy conversion can be achieved. However, current water electrolysis technology is heavily dependent on freshwater resources. Data show that more than one-third of the world's land surface is arid or semi-arid areas, where freshwater resources are scarce and it is difficult to support large-scale hydrogen production. Moreover, even in areas with relatively abundant freshwater resources, water shortages caused by industrial and agricultural consumption, pollution, and global climate change are becoming increasingly serious. In recent years, direct seawater electrolysis technology has been used to try to solve the problem of insufficient fresh water. However, due to the large amount of impurities and chloride ions in seawater, harmful chlorine byproducts are produced during the electrolysis process, which not only requires additional processing steps to remove these byproducts, but also increases production costs and system complexity. These problems seriously restrict the widespread application and promotion of water electrolysis hydrogen production. Therefore, it is urgent to develop an electrolysis hydrogen production device that is more suitable for arid or semi-arid areas. Summary of the invention

[0003] The main purpose of the present invention is to provide an electrolytic hydrogen production device and a hydrogen production method thereof to solve the problem of the dependence of the electrolytic hydrogen production technology on fresh water resources in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an electrolytic hydrogen production device, which includes: an airflow control conduction unit, an electrolytic hydrogen production unit, a power supply unit and a gas collection unit, the airflow control conduction unit has a first inlet and a first outlet, the first inlet is connected to an air source, the airflow control conduction unit is used to introduce air and increase the flow rate, and transmit the treated air after obtaining; the electrolytic hydrogen production unit includes an electrolytic cell and a desiccant unit, the electrolytic cell includes an electrode unit, the desiccant unit is arranged in the electrolytic cell, one end of the electrode unit extends to the inside of the desiccant unit, the electrolytic cell has a second inlet and a second outlet, the second inlet is connected to the first outlet, the desiccant unit is used to absorb moisture in the treated air using a desiccant material including an electrolyte to obtain an electrolyte solution, and continuously replenish moisture to the electrolyte solution; the electrode unit is used to electrolyze the electrolyte solution to obtain hydrogen and oxygen; the power supply unit is electrically connected to the electrolytic hydrogen production unit, and the power supply unit is used to supply power to the electrode unit; the gas collection unit has a third inlet, the third inlet is connected to the second outlet, and the gas collection unit is used to collect hydrogen and oxygen.

[0005] Furthermore, the hygroscopic material includes a porous medium and a hygroscopic raw material filled in the pores of the porous medium; the mass ratio of the hygroscopic raw material to the porous medium is 1:100 to 1:1.

[0006] Further, the hygroscopic raw material is selected from any one or more of a mixture of polyols and inorganic salts, solid sulfuric acid, solid potassium hydroxide, solid potassium acetate and polyols; the mass ratio of inorganic salt to polyol in the mixture of polyols and inorganic salts is 1:100 to 100:1; and / or, the polyol is selected from any one or more of propylene glycol, glycerol, mannitol, diethylene glycol and sorbitol, and / or, the inorganic salt is selected from any one or more of calcium chloride, potassium chloride, lithium chloride, sodium chloride and calcium sulfate; and / or, the porous medium is selected from any one or more of glass foam, polyurethane sponge, quartz wool, ceramic foam and polytetrafluoroethylene porous membrane; and / or, the porosity of the porous medium is 10 to 80%, preferably 30 to 60%; and / or, the pore size of the porous medium is 10 to 200 μm, and / or, the specific surface area of ​​the porous medium is 50 to 1000 m 2 / g.

[0007] Furthermore, the material of the electrode in the electrode unit is selected from any one or more of nickel foam, platinum mesh, carbon-based material, ruthenium oxide, stainless steel electrode, nickel-cobalt alloy and metal oxide; the specific surface area of ​​the electrode is 50 to 1000 m 2 / g.

[0008] Furthermore, when the hygroscopic raw material is solid sulfuric acid and the porous medium is glass foam, the material of the electrode is a platinum mesh.

[0009] Furthermore, when the hygroscopic raw material is potassium hydroxide solid and the porous medium is polyurethane sponge, the material of the electrode is nickel foam.

[0010] Furthermore, the first inlet of the airflow control conduction unit is provided with a filter device; and / or the flow rate of the treated air is ≤1000m 3 / h, and / or, relative humidity of air ≥4%.

[0011] Furthermore, the power supply unit is selected from any one or more of solar energy, wind energy, tidal energy, geothermal energy and hydroelectric power.

[0012] According to another aspect of the present invention, a method for producing hydrogen using the above-mentioned electrolytic hydrogen production device is provided, the method comprising: introducing air and increasing the flow rate through an airflow control conduction unit to obtain treated air and then transmitting it to a desiccant unit; using a desiccant material including an electrolyte to absorb moisture in the treated air to obtain an electrolyte solution; electrolyzing the electrolyte solution in an electrode unit to obtain hydrogen and oxygen; collecting hydrogen and oxygen through a gas collection unit; wherein power is supplied to the electrode unit by a power supply unit.

[0013] Furthermore, the mass concentration of the electrolyte solution is 10 to 90%.

[0014] Applying the technical solution of the present invention, the present application provides an electrolytic hydrogen production device that directly obtains moisture from the air and performs electrolysis, which is particularly suitable for arid and semi-arid areas with a lack of fresh water resources. Specifically, by controlling the conduction unit through the airflow, it is possible to ensure that the air effectively enters the hygroscopic unit while ensuring a sufficient flow of air supply. In the absence of liquid water input, the hygroscopic material including the electrolyte in the hygroscopic unit is used to capture moisture from the treated air to directly form an electrolyte solution, and at the same time, the electrolyte solution can be continuously replenished with water. Therefore, the electrolytic hydrogen production device of the present application does not require multiple mass transfers, and can directly transfer the captured moisture to the surface of the electrode in the electrode unit, and electrolyze the electrolyte solution to generate hydrogen and oxygen, thereby achieving an efficient electrolysis reaction. The present application makes full use of the endless resource of air, gets rid of the dependence of traditional water electrolysis hydrogen production on water resources, thereby realizing hydrogen production in arid and water-deficient areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of the electrolytic hydrogen production device of the present application is shown.

[0017] Among them, the above drawings include the following reference numerals:

[0018] 1. Moisture absorption unit; 2. Electrode unit; 10. Airflow control conduction unit; 20. Electrolysis hydrogen production unit; 30. Power supply unit; 40. Gas collection unit. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] As analyzed in the background technology of this application, the electrolytic hydrogen production technology in the prior art has the problem of dependence on fresh water resources. In order to solve the above problem, this application provides an electrolytic hydrogen production device and a hydrogen production method thereof.

[0021] In a typical embodiment of the present application, a hydrogen production device by electrolysis is provided, such as Figure 1 As shown, the electrolytic hydrogen production device includes: an airflow control conduction unit 10, an electrolytic hydrogen production unit 20, a power supply unit 30 and a gas collection unit 40, the airflow control conduction unit 10 has a first inlet and a first outlet, the first inlet is connected to an air source, the airflow control conduction unit 10 is used to introduce air and increase the flow rate, and transmit the treated air after obtaining; the electrolytic hydrogen production unit 20 includes an electrolytic cell and a moisture absorption unit 1, the electrolytic cell includes an electrode unit 2, the moisture absorption unit 1 is arranged in the electrolytic cell, one end of the electrode unit 2 extends to the inside of the moisture absorption unit 1, and the electrolytic cell has There is a second inlet and a second outlet, the second inlet is connected to the first outlet, the hygroscopic unit 1 is used to absorb moisture in the treated air using a hygroscopic material including an electrolyte to obtain an electrolyte solution, and continuously replenish moisture to the electrolyte solution; the electrode unit 2 is used to electrolyze the electrolyte solution to obtain hydrogen and oxygen; the power supply unit 30 is electrically connected to the electrolytic hydrogen production unit 20, and the power supply unit 30 is used to supply power to the electrode unit 2; the gas collection unit 40 has a third inlet, the third inlet is connected to the second outlet, and the gas collection unit 40 is used to collect hydrogen and oxygen.

[0022] The present application provides an electrolytic hydrogen production device that directly obtains moisture from the air and performs electrolysis, which is particularly suitable for arid and semi-arid areas where fresh water resources are scarce. Specifically, through the airflow control conduction unit 10, it is possible to ensure that air effectively enters the hygroscopic unit 1, while ensuring a sufficient flow of air supply. In the absence of liquid water input, the hygroscopic material including an electrolyte in the hygroscopic unit 1 is used to capture moisture from the treated air, directly forming an electrolyte solution, and at the same time, the electrolyte solution can be continuously replenished with water. Therefore, the electrolytic hydrogen production device of the present application does not require multiple mass transfers, and can directly transfer the captured moisture to the surface of the electrode in the electrode unit 2, and electrolyze the electrolyte solution to generate hydrogen and oxygen, thereby achieving an efficient electrolysis reaction. The present application makes full use of the endless resource of air, gets rid of the dependence of traditional water electrolysis hydrogen production on water resources, thereby realizing hydrogen production in arid and water-deficient areas.

[0023] In one embodiment of the present application, the hygroscopic material includes a porous medium and a hygroscopic raw material filled in the pores of the porous medium; the mass ratio of the hygroscopic raw material to the porous medium is 1:100 to 1:1.

[0024] Preferably, the hygroscopic material includes a porous medium and a hygroscopic raw material filled in the pores of the porous medium, and the mass ratio of the hygroscopic raw material to the porous medium is preferably controlled within the above range, which helps to increase the contact area between the hygroscopic material and the air, thereby improving the efficiency of absorbing water. The porous medium helps to support the hygroscopic raw material and effectively conduct the captured water to the electrode surface.

[0025] In order to further increase the contact area with the treated air and improve the efficiency of absorbing moisture, in one embodiment of the present application, the hygroscopic raw material is selected from any one or more of a mixture of polyols and inorganic salts, solid sulfuric acid, solid potassium hydroxide, solid potassium acetate and polyols; the mass ratio of inorganic salts to polyols in the mixture of polyols and inorganic salts is 1:100-100:1; and / or, the polyol is selected from any one or more of propylene glycol, glycerol, mannitol, diethylene glycol and sorbitol, and / or, the inorganic salt is selected from any one or more of calcium chloride, potassium chloride, lithium chloride, sodium chloride and calcium sulfate; and / or, the porous medium is selected from any one or more of glass foam, polyurethane sponge, quartz wool, ceramic foam and polytetrafluoroethylene porous membrane; and / or, the porosity of the porous medium is 10-80%, preferably 30-60%; and / or, the pore size of the porous medium is 10-200 μm, and / or, the specific surface area of ​​the porous medium is 50-1000 m 2 / g.

[0026] In one embodiment of the present application, the material of the electrode in the electrode unit 2 is selected from any one or more of nickel foam, platinum mesh, carbon-based material, ruthenium oxide, stainless steel electrode, nickel-cobalt alloy and metal oxide; the specific surface area of ​​the electrode is 50 to 1000 m 2 / g.

[0027] It is preferred to control the material type and specific surface area of ​​the electrode within the above range, which helps the electrolyte solution to fully maintain an efficient electrolysis reaction, thereby continuously and stably producing hydrogen.

[0028] In one embodiment of the present application, when the hygroscopic raw material is solid sulfuric acid and the porous medium is glass foam, the material of the electrode is a platinum mesh.

[0029] Preferably, the hygroscopic raw material is solid sulfuric acid, which has strong hygroscopic properties and helps to absorb enough water from the air for electrolysis at a relative humidity as low as 4%. Preferably, the porous medium is glass foam, which has good chemical inertness, a porosity of more than 75% and an appropriate pore size (40 to 80 μm), which helps to support the sulfuric acid solid to effectively absorb water and conduct it to the electrode surface. After the hygroscopic raw material sulfuric acid solid absorbs water, an electrolyte solution, i.e., a sulfuric acid solution, is formed. The material of the preferred electrode is a platinum mesh, which has high catalytic activity and corrosion resistance and is more suitable for operation in a strongly acidic environment, thereby helping to maintain an efficient electrolysis reaction under low humidity conditions.

[0030] In one embodiment of the present application, when the hygroscopic raw material is potassium hydroxide solid and the porous medium is polyurethane sponge, the material of the electrode is nickel foam.

[0031] The preferred hygroscopic raw material is potassium hydroxide solid, which has strong hygroscopic properties and helps to absorb enough water from the air for electrolysis at a relative humidity of 15 to 30%. The preferred porous medium is polyurethane sponge, which helps to support the potassium hydroxide solid to effectively absorb water and conduct it to the electrode surface, thereby facilitating the continuity of the electrolysis process. The hygroscopic raw material potassium hydroxide solid absorbs water to form an electrolyte solution, namely potassium hydroxide solution. The preferred electrode material is nickel foam, which has high conductivity and a large specific surface area, and is more suitable for operation in an alkaline environment, thereby facilitating the stable production of hydrogen in a medium to low humidity environment.

[0032] In one embodiment of the present application, the first inlet of the airflow control conduction unit 10 is provided with a filter device; and / or the flow rate of the treated air is ≤1000m 3 / h, and / or, relative humidity of air ≥4%.

[0033] Preferably, the first inlet of the airflow control conduction unit 10 is provided with a filter device, which helps to filter particulate matter in the air and reduce the subsequent complex processing process, thereby improving the efficiency of subsequent absorption of moisture in the treated air and improving the purity of hydrogen and oxygen. It is preferred to control the flow rate of the treated air within the above range, which helps to maintain the supply of air and thus provide sufficient moisture. Even in an air environment with a relative humidity in the above range, the electrolytic hydrogen production device of the present application can operate stably and produce high-purity hydrogen and oxygen.

[0034] In one embodiment of the present application, the power supply unit 30 is selected from any one or more of solar energy, wind energy, tidal energy, geothermal energy and hydroelectric power generation.

[0035] It is preferred that the power supply unit 30 supplies power in the above range, which helps to save non-renewable energy, thereby achieving green and sustainable hydrogen production.

[0036] In another typical embodiment of the present application, a method for producing hydrogen using the above-mentioned electrolytic hydrogen production device is provided, the method comprising: introducing air and increasing the flow rate through the airflow control conduction unit 10, and transmitting the treated air to the desiccant unit 1; using a desiccant material including an electrolyte to absorb moisture in the treated air to obtain an electrolyte solution; electrolyzing the electrolyte solution in the electrode unit 2 to obtain hydrogen and oxygen; collecting hydrogen and oxygen through the gas collection unit 40; wherein, the power supply unit 30 supplies power to the electrode unit 2.

[0037] The above-mentioned method of producing hydrogen by the electrolytic hydrogen production device can directly obtain moisture from the air and electrolyze to produce hydrogen. Specifically, the air passes through the airflow control conduction unit 10, which can increase its flow rate, and at the same time continuously and effectively enters the hygroscopic unit 1. In the absence of liquid water input, the hygroscopic material including the electrolyte in the hygroscopic unit 1 is used to capture moisture from the treated air to directly form an electrolyte solution, and at the same time, the electrolyte solution can be continuously replenished with water. This method does not require multiple mass transfers, and can directly conduct the captured moisture to the surface of the electrode in the electrode unit 2, and electrolyze the electrolyte solution to generate hydrogen and oxygen, thereby achieving an efficient electrolysis reaction. The hydrogen production method of the present application not only simplifies the hydrogen production process, reduces the difficulty of operation, but also improves the efficiency of hydrogen production.

[0038] In one embodiment of the present application, the mass concentration of the electrolyte solution is 10-90%.

[0039] The mass concentration of the electrolyte solution is preferably controlled within the above range, which helps to efficiently carry out the electrolysis process while reducing equipment corrosion caused by too high a mass concentration and a decrease in electrolysis efficiency caused by too low a mass concentration.

[0040] The beneficial effects of the present application will be further illustrated below in conjunction with embodiments.

[0041] Example 1

[0042] Use Figure 1 The electrolytic hydrogen production device shown in the figure produces hydrogen in a desert arid area with an ambient temperature of 25°C and a relative humidity of 15%. The air is introduced into the air flow control conduction unit 10 through the first inlet and filtered by the filter device to increase its flow rate to 9m 3 / h, and the treated air is transmitted to the electrolytic hydrogen production unit 20 through the first outlet. The electrolytic hydrogen production unit 20 includes an electrolytic cell and a desiccant unit 1, the electrolytic cell includes an electrode unit 2, the desiccant unit 1 is arranged in the electrolytic cell, and one end of the electrode unit 2 extends to the inside of the desiccant unit 1. The treated air enters the desiccant unit 1 through the second inlet of the electrolytic cell, and the desiccant material in the desiccant unit 1 includes a porous medium and a desiccant raw material filled in the pores of the porous medium, wherein the desiccant raw material is solid sulfuric acid, the porous medium is glass foam, the porosity of the porous medium is 75%, the pore size is 60μm and the specific surface area is 500m 2 / g, the mass ratio of hygroscopic raw material sulfuric acid solid to porous medium glass foam is 1:20. The moisture in the treated air is absorbed by the hygroscopic material to obtain an electrolyte solution sulfuric acid solution, and the equilibrium mass concentration of the sulfuric acid solution is 40%. The sulfuric acid solution is electrolyzed using a platinum mesh electrode to obtain hydrogen and oxygen. The hydrogen and oxygen output from the second outlet of the electrolytic cell are passed through the third inlet into the gas collection unit 40 for collection. The solar energy in the power supply unit 30 supplies power to the electrode unit 2.

[0043] Example 2

[0044] Use Figure 1 The electrolytic hydrogen production device shown in the figure produces hydrogen in a semi-arid area with an ambient temperature of 20°C and a relative humidity of 25%. The air is introduced into the air flow control conduction unit 10 through the first inlet and filtered by the filter device to increase its flow rate to 7m 3 / h, and the treated air is transmitted to the electrolytic hydrogen production unit 20 through the first outlet. The electrolytic hydrogen production unit 20 includes an electrolytic cell and a desiccant unit 1, the electrolytic cell includes an electrode unit 2, the desiccant unit 1 is arranged in the electrolytic cell, and one end of the electrode unit 2 extends to the inside of the desiccant unit 1. The treated air enters the desiccant unit 1 through the second inlet of the electrolytic cell. The desiccant material in the desiccant unit 1 includes a porous medium and a desiccant raw material filled in the pores of the porous medium, wherein the desiccant raw material is potassium hydroxide solid, the porous medium is a polyurethane sponge, and the porosity of the porous medium is 65%, the pore size is 50μm and the specific surface area is 300m 2 / g, the mass ratio of the hygroscopic raw material potassium hydroxide solid to the porous medium polyurethane sponge is 1:5. The moisture in the treated air is absorbed by the hygroscopic material to obtain an electrolyte solution potassium hydroxide solution, and the equilibrium mass concentration of the potassium hydroxide solution is 50%. The potassium hydroxide solution is electrolyzed using a nickel foam electrode to obtain hydrogen and oxygen. The hydrogen and oxygen output from the second outlet of the electrolytic cell are passed through the third inlet into the gas collection unit 40 for collection. The wind energy in the power supply unit 30 supplies power to the electrode unit 2.

[0045] Example 3

[0046] The difference from Example 1 is that the mass ratio of the hygroscopic raw material sulfuric acid solid to the porous medium glass foam is 1:100, and hydrogen is finally obtained.

[0047] Example 4

[0048] The difference from Example 1 is that the hygroscopic material is only the hygroscopic raw material sulfuric acid solid, and hydrogen is finally obtained.

[0049] Example 5

[0050] The difference from Example 1 is that the porous medium glass foam has a porosity of 80%, a pore size of 80 μm, and a specific surface area of ​​1000 m 2 / g, and finally obtain hydrogen.

[0051] Example 6

[0052] The difference from Example 1 is that the porous medium glass foam has a porosity of 5%, a pore size of 5 μm, and a specific surface area of ​​40 m 2 / g, and finally obtain hydrogen.

[0053] Example 7

[0054] The difference from Example 2 is that the hygroscopic raw material is a mixture of potassium chloride and propylene glycol, the porous medium is a polyurethane sponge, the mass ratio of potassium chloride to propylene glycol is 1:1, and hydrogen is finally obtained.

[0055] Comparative Example 1

[0056] The difference from Example 1 is that no hygroscopic material is added to the hygroscopic unit 1, and hydrogen is finally obtained.

[0057] Comparative Example 2

[0058] The difference from Example 1 is that the airflow control conduction unit 10 is not used, and the air directly contacts the moisture absorption unit 1 to finally obtain hydrogen.

[0059] Test method:

[0060] The water absorption rate test method of the hygroscopic material is obtained by weighing, that is, the total weight of the hygroscopic material before and after absorbing moisture per unit time is weighed respectively, and the water absorption rate = (the total weight of the hygroscopic material after absorbing moisture - the total weight of the hygroscopic material before absorbing moisture) / unit time. The hydrogen production is measured by a flow meter.

[0061] The results of the water absorption rate of the hygroscopic materials in the above embodiments and comparative examples, the stable operation time of the electrolytic hydrogen production device and the hydrogen production are shown in Table 1.

[0062] Table 1

[0063]

[0064] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0065] The present application provides an electrolytic hydrogen production device that directly obtains moisture from the air and performs electrolysis, which is particularly suitable for arid and semi-arid areas where fresh water resources are scarce. Specifically, by controlling the conduction unit through the airflow, it is possible to ensure that the air effectively enters the hygroscopic unit while ensuring a sufficient air supply. In the absence of liquid water input, the hygroscopic material including the electrolyte in the hygroscopic unit is used to capture moisture from the treated air to directly form an electrolyte solution, and the electrolyte solution can be continuously replenished with water. Therefore, the electrolytic hydrogen production device of the present application does not require multiple mass transfers, and can directly transfer the captured moisture to the surface of the electrode in the electrode unit, and electrolyze the electrolyte solution to generate hydrogen and oxygen, thereby achieving an efficient electrolysis reaction. The present application makes full use of the endless resource of air, gets rid of the dependence of traditional water electrolysis on water resources for hydrogen production, thereby realizing hydrogen production in arid and water-scarce areas.

[0066] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydrogen production device by electrolysis, characterized in that: The electrolytic hydrogen production device comprises: An airflow control conduction unit (10) has a first inlet and a first outlet, wherein the first inlet is connected to an air source, and the airflow control conduction unit (10) is used to introduce air and increase the flow rate, and then transmit the processed air; An electrolytic hydrogen production unit (20), the electrolytic hydrogen production unit (20) comprising an electrolytic cell and a moisture absorption unit (1), the electrolytic cell comprising an electrode unit (2), the moisture absorption unit (1) being arranged in the electrolytic cell, one end of the electrode unit (2) extending into the interior of the moisture absorption unit (1), the electrolytic cell having a second inlet and a second outlet, the second inlet being connected to the first outlet, the moisture absorption unit (1) being used to absorb moisture in the treated air using a moisture absorption material comprising an electrolyte to obtain an electrolyte solution, while continuously replenishing moisture to the electrolyte solution; the electrode unit (2) being used to electrolyze the electrolyte solution to obtain hydrogen and oxygen; A power supply unit (30) is electrically connected to the electrolytic hydrogen production unit (20), and the power supply unit (30) is used to supply power to the electrode unit (2); The gas collecting unit (40) has a third inlet, the third inlet is connected to the second outlet, and the gas collecting unit (40) is used to collect the hydrogen and the oxygen.

2. The electrolytic hydrogen production device according to claim 1, characterized in that: The hygroscopic material comprises a porous medium and a hygroscopic raw material filled in the pores of the porous medium; the mass ratio of the hygroscopic raw material to the porous medium is 1:100 to 1:

1.

3. The electrolytic hydrogen production device according to claim 2, characterized in that: The hygroscopic raw material is selected from any one or more of a mixture of polyols and inorganic salts, solid sulfuric acid, solid potassium hydroxide, solid potassium acetate and polyols; The mass ratio of the inorganic salt to the polyol in the mixture of the polyol and the inorganic salt is 1:100 to 100:1; and / or the polyol is selected from any one or more of propylene glycol, glycerol, mannitol, diethylene glycol and sorbitol, and / or the inorganic salt is selected from any one or more of calcium chloride, potassium chloride, lithium chloride, sodium chloride and calcium sulfate; and / or, the porous medium is selected from any one or more of glass foam, polyurethane sponge, quartz wool, ceramic foam and polytetrafluoroethylene porous membrane; and / or, the porosity of the porous medium is 10-80%, preferably 30-60%; and / or, the pore size of the porous medium is 10-200 μm, and / or, the specific surface area of ​​the porous medium is 50-1000 m 2 / g.

4. The electrolytic hydrogen production device according to claim 3, characterized in that: The material of the electrode in the electrode unit (2) is selected from any one or more of nickel foam, platinum mesh, carbon-based material, ruthenium oxide, stainless steel electrode, nickel-cobalt alloy and metal oxide; the specific surface area of ​​the electrode is 50 to 1000 m 2 / g.

5. The electrolytic hydrogen production device according to claim 4, characterized in that: When the hygroscopic raw material is solid sulfuric acid and the porous medium is glass foam, the material of the electrode is platinum mesh.

6. The electrolytic hydrogen production device according to claim 4, characterized in that: When the hygroscopic raw material is potassium hydroxide solid and the porous medium is polyurethane sponge, the material of the electrode is nickel foam.

7. The electrolytic hydrogen production device according to any one of claims 1 to 6, characterized in that: The first inlet of the airflow control conduction unit (10) is provided with a filtering device; and / or the flow rate of the treated air is ≤1000m 3 / h, and / or, the relative humidity of the air is ≥4%.

8. The electrolytic hydrogen production device according to any one of claims 1 to 7, characterized in that: The power supply unit (30) is selected from any one or more of solar energy, wind energy, tidal energy, geothermal energy and hydroelectric power.

9. A method for producing hydrogen using the electrolytic hydrogen production device according to any one of claims 1 to 8, characterized in that: The method comprises: Air is introduced and the flow rate is increased through the air flow control conduction unit (10), and the treated air is then transmitted to the moisture absorption unit (1); Adopting a hygroscopic material including an electrolyte to absorb moisture in the treated air to obtain an electrolyte solution; Electrolyzing the electrolyte solution in an electrode unit (2) to obtain hydrogen and oxygen; collecting the hydrogen and the oxygen through a gas collection unit (40); Wherein, the electrode unit (2) is supplied with power by a power supply unit (30).

10. The method according to claim 9, characterized in that The mass concentration of the electrolyte solution is 10-90%.

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