Water electrolysis equipment

Abstract

The invention relates to water electrolysis equipment. The water electrolysis equipment comprises an electrolysis chamber, a chemical oxygen evolution chamber, a power supply device, a first anode, a second anode and a cathode, the first anode and the cathode are arranged in the electrolysis chamber, the second anode is arranged in the chemical oxygen evolution chamber, and the first anode and the second anode are connected in parallel and can independently control power-on and power-off. After the first anode in the electrolysis chamber is electrified to react to reach the upper limit of the capacity of the material, the second anode is electrified to react, and after oxygen is released, the first anode continues to be electrified to react. In this way, the first anode and the second anode alternately circulate to conduct energization reaction, the cathode is continuously energized to produce hydrogen, and continuous hydrogen production is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic hydrogen production, and in particular to a water electrolysis device. Background Art

[0002] As one of the clean energy sources with the greatest development potential, hydrogen energy can be connected to multiple forms of energy to form a coupled development system. It is an important carrier for solving the problem of renewable energy consumption and the best choice for achieving large-scale deep decarbonization in areas such as transportation, industry and construction.

[0003] Alkaline water electrolysis hydrogen production technology has high technical maturity and low cost, and is the key to achieving large-scale application of electric-hydrogen coupling. The membraneless hydrogen production system uses the chemical decoupling water electrolysis method to produce hydrogen and oxygen in the electrolyzer and chemical precipitation tank respectively, completely isolating hydrogen and oxygen, and avoiding system shutdown caused by power fluctuations in the membrane hydrogen production system. However, the traditional membraneless hydrogen production system cannot produce hydrogen continuously because the chemical decoupling oxygen production and electrolytic hydrogen production are carried out separately at different times and spaces. Summary of the invention

[0004] Based on this, it is necessary to provide a water electrolysis device to solve the problem that the traditional membraneless hydrogen production system cannot produce hydrogen continuously.

[0005] A water electrolysis device comprises an electrolysis chamber, a chemical oxygen evolution chamber, a first anode, a second anode and a cathode; the first anode and the cathode are arranged in the electrolysis chamber, the second anode is arranged in the chemical oxygen evolution chamber, the first anode and the second anode are connected in parallel and can control power on and off independently of each other.

[0006] In one embodiment, a first switch for controlling power on and off of the first anode is provided on the parallel circuit of the first anode, and a second switch for controlling power on and off of the second anode is provided on the parallel circuit of the second anode.

[0007] In one of the embodiments, the water electrolysis equipment further includes a heating device, and the heating device is disposed in the chemical oxygen evolution chamber.

[0008] In one embodiment, the water electrolysis equipment further includes a first vibration device, and the first vibration device is connected to the first anode.

[0009] In one embodiment, the water electrolysis equipment further includes a second vibration device, and the second vibration device is connected to the second anode.

[0010] In one embodiment, the water electrolysis equipment further includes a power supply device and a power generation device, the first anode, the second anode and the cathode are respectively connected to the power supply device, and the power generation device is connected to the power supply device for supplying power to the power supply device.

[0011] In one embodiment, the power generation device includes a solar cell.

[0012] In one embodiment, the water electrolysis equipment further includes a power storage device, which is connected to the power generation device and the power supply device to store the electrical energy of the power generation device and supply power to the power supply device.

[0013] In one embodiment, the material of the first anode and / or the second anode includes phosphate-pillared cobalt-doped nickel hydroxide.

[0014] In one embodiment, the phosphate pillared cobalt-doped nickel hydroxide is prepared by a method comprising the following steps:

[0015] Cobalt-doped nickel hydroxide is connected to the positive electrode of a power source, and metal nickel is connected to the negative electrode of a power source, and immersed in an alkaline solution containing phosphate for electrochemical treatment to prepare the phosphate-pillared cobalt-doped nickel hydroxide.

[0016] In one embodiment, the first anode and / or the second anode is a porous structure.

[0017] Compared with traditional technology, the above water electrolysis equipment has the following beneficial effects:

[0018] In the above-mentioned water electrolysis equipment, after the first anode in the electrolysis chamber is energized to react and reaches the upper limit of the material capacity, the second anode is energized to react, and after the oxygen is released, the first anode is energized to react again. In this way, the first anode and the second anode are alternately energized to react, and the cathode is continuously energized to produce hydrogen, thereby realizing continuous hydrogen production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of a water electrolysis device according to an embodiment.

[0020] Description of reference numerals:

[0021] 10. Water electrolysis equipment; 100. Electrolysis chamber; 110. Hydrogen outlet pipeline; 120. First closure member; 130. First handle; 140. First ventilation pipe; 141. First gas outlet; 150. First liquid hole; 200. Chemical oxygen evolution chamber; 210. Oxygen outlet pipeline; 220. Second closure member; 230. Second handle; 240. Second ventilation pipe; 241. Second gas outlet; 250. Second liquid hole; 300. Power supply device; 310. First switch; 320. Second switch; 330. Hinge device; 410. First anode; 420. Second anode; 430. Cathode; 500. Power generation device; 600. Power storage device; 700. Heating device; 810. First vibration device; 820. Second vibration device. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] 1 , a water electrolysis device 10 according to an embodiment of the present invention includes an electrolysis chamber 100 , a chemical oxygen evolution chamber 200 , a power supply device 300 , a first anode 410 , a second anode 420 , and a cathode 430 .

[0028] The first anode 410, the second anode 420 and the cathode 430 are respectively connected to the power supply device 300. The first anode 410 and the cathode 430 are arranged in the electrolysis chamber 100. The second anode 420 is arranged in the chemical oxygen evolution chamber 200. The first anode 410 and the second anode 420 are connected in parallel and can be independently controlled to be on and off.

[0029] Wherein, an alkali solution may be added to the electrolysis chamber 100. When the cathode 430 is powered, a hydrogen evolution reaction occurs, so that water is electrolyzed to produce hydrogen gas and hydroxide ions. The first anode 410 reacts with the hydroxide ions to produce water and electrons.

[0030] Water may be added to the chemical oxygen evolution chamber 200. When the second anode 420 is powered on, an oxygen evolution reaction occurs, and oxygen is generated after the anode material reacts with water.

[0031] After the first anode 410 in the electrolysis chamber 100 is energized to react and reaches the upper limit of the material capacity, the second anode 420 is energized to react, and after the oxygen is released, the first anode 410 is continued to be energized to react. In this way, the first anode 410 and the second anode 420 are alternately energized to react, thereby realizing continuous hydrogen and oxygen production.

[0032] The first anode 410 and the second anode 420 can be controlled to be powered on and off independently of each other. For example, the parallel circuit of the first anode 410 is provided with a first switch 310 for controlling the power on and off of the first anode 410. The parallel circuit of the second anode 420 is provided with a second switch 320 for controlling the power on and off of the second anode 420. Further, the parallel circuit of the first anode 410 and the parallel circuit of the second anode 420 are connected to the positive wire of the power supply device 300 through the hinge device 330.

[0033] The electrolysis chamber 100 is connected to a hydrogen outlet pipe 110. The hydrogen outlet pipe 110 is provided with a first closure member 120, such as a sealing plug, which can be closed or opened. Furthermore, a first vent pipe 140 is connected to the side of the hydrogen outlet pipe 110. A first handle 130 may be provided on the first closure member 120, and the first handle 130 can be used to facilitate the lower end of the first closure member 120 (sealing plug) to be moved down to align with the upper edge of the first gas outlet 141 of the first vent pipe 140, so that there is no gas residue in the hydrogen outlet pipe 110; the first handle 130 can also be used to facilitate the first closure member 120 (sealing plug) to be moved down to isolate the hydrogen outlet pipe 110 from the first vent pipe 140, so that the first vent pipe 140 can be easily cleaned.

[0034] The diameter of the hydrogen outlet pipe 110 is preferably larger than the size of the first anode 410 , so that the first anode 410 can be placed into or taken out of the electrolysis chamber 100 through the hydrogen outlet pipe 110 .

[0035] In some examples, the electrolysis chamber 100 is provided with a first liquid-passing hole 150. The first liquid-passing hole 150 may be provided at the lower end of the electrolysis chamber 100, for example.

[0036] The chemical oxygen evolution chamber 200 is connected to an oxygen outlet pipe 210. The oxygen outlet pipe 210 is provided with a second closure member 220, such as a sealing plug, which can be closed or opened. Furthermore, a second ventilation pipe 240 is connected to the side of the oxygen outlet pipe 210. A second handle 230 can be provided on the second closure member 220, and the second handle 230 can be used to facilitate the lower end of the second closure member 220 (sealing plug) to be moved down to align with the upper edge of the second air outlet 241 of the second ventilation pipe 240, so that there is no gas residue in the oxygen outlet pipe 210; the second handle 230 can also be used to facilitate the second closure member 220 (sealing plug) to be moved down to isolate the oxygen outlet pipe 210 from the second ventilation pipe 240, so that the second ventilation pipe 240 can be easily cleaned.

[0037] The diameter of the oxygen outlet pipe 210 is preferably larger than the size of the second anode 420 , so that the second anode 420 can be placed in or taken out of the chemical oxygen evolution chamber 200 through the oxygen outlet pipe 210 .

[0038] In some examples, the chemical oxygen evolution chamber 200 is provided with a second liquid through hole 250. The second liquid through hole 250 can be provided at the lower end of the chemical oxygen evolution chamber 200, for example.

[0039] In some examples, the water electrolysis device 10 further includes a power generation device 500. The power generation device 500 is connected to the power supply device 300 to supply power to the power supply device 300.

[0040] The power generation device 500 includes, for example, but is not limited to, solar cells. At present, the electricity cost of water electrolysis to produce hydrogen accounts for more than 50% of the total cost. With the maturity of the photovoltaic power generation industry, the average electricity cost of photovoltaic power generation is much lower than the traditional industrial electricity cost. Therefore, by providing energy for water electrolysis to produce hydrogen through photovoltaic power generation, production costs can be reduced, and excess electricity from photovoltaic power generation can also be absorbed, thus solving the problem of "abandoning light" to a large extent.

[0041] Solar cells are subject to light conditions and have unstable energy output. The strong volatility of photovoltaic power generation will seriously affect the dynamic adaptability and operational reliability of the system. To solve this problem, in some examples, the water electrolysis device 10 also includes a power storage device 600. The power storage device 600 is connected to the power generation device 500 and the power supply device 300 to store the electrical energy of the power generation device 500 and supply power to the power supply device 300.

[0042] The power storage device 600 includes, for example, but is not limited to, a battery, more specifically, a lithium-ion battery, a sodium-ion battery, etc. When there is sufficient light, the battery is used to store the surplus energy generated by the solar cell. When there is insufficient light, the battery is used to supply power to the power supply device 300 to achieve the effect of energy compensation.

[0043] In some examples, the water electrolysis device 10 further includes a heating device 700. The heating device 700 is disposed in the chemical oxygen evolution chamber 200. The heating device 700 is used to heat the liquid in the chemical oxygen evolution chamber 200 to achieve a better reaction temperature of the second anode 420.

[0044] Furthermore, in some of the examples, the heating device 700 is connected to the power generation device 500. In this way, the power generation device 500 can directly supply power to the heating device 700, thereby improving the utilization efficiency of the power generation device 500.

[0045] In some of the examples, the water electrolysis device 10 further includes a first vibration device 810. The first vibration device 810 is connected to the first anode 410. For example, the first vibration device 810 is directly connected to the first anode 410, or the first vibration device 810 is connected to a wire connected to the first anode 410. The first vibration device 810 removes the gas attached to the surface of the first anode 410 by generating vibration, so that the first anode 410 can better contact the liquid. The vibration frequency of the first vibration device 810 is, for example, 10W to 80W.

[0046] In some of the examples, the water electrolysis device 10 further includes a second vibration device 820. The second vibration device 820 is connected to the second anode 420. For example, the second vibration device 820 is directly connected to the second anode 420, or the second vibration device 820 is connected to a wire connected to the second anode 420. The second vibration device 820 removes the gas attached to the surface of the second anode 420 by generating vibration, so that the second anode 420 can better contact the liquid. The vibration frequency of the second vibration device 820 is, for example, 10W to 80W.

[0047] In some examples, at least one of the first anode 410 and the second anode 420 is a porous structure. The porous structure can increase the contact area with the medium and improve the electrolysis efficiency.

[0048] In some examples, the material of at least one of the first anode 410 and the second anode 420 includes nickel hydroxide.

[0049] Among them, the cathode 430 reacts after being energized: 4H2O+4e - →4OH - +2H2.

[0050] When the first anode 410 is energized, a reaction occurs: Ni(OH)2+OH - →NiOOH+H2O+e - .

[0051] When the second anode 420 is powered on, a reaction occurs: NiOOH+H2O→Ni(OH)2+O2.

[0052] Further, in some examples, the material of at least one of the first anode 410 and the second anode 420 includes phosphate-pillared cobalt-doped nickel hydroxide.

[0053] Among them, phosphate-pillared cobalt-doped nickel hydroxide is obtained by intercalating phosphate between the layers of cobalt-doped multilayer nickel hydroxide. Cobalt doping can improve electrolysis efficiency, and phosphate pillaring intercalation increases the interlayer spacing of nickel hydroxide, increases the active area, and improves the absorption and release capacity of hydroxide.

[0054] In some examples, phosphate pillared cobalt doped nickel hydroxide is prepared by a method comprising the following steps:

[0055] Cobalt-doped nickel hydroxide is connected to the positive electrode of a power source, and metal nickel is connected to the negative electrode of a power source, and immersed in an alkaline solution containing phosphate for electrochemical treatment to prepare phosphate-pillared cobalt-doped nickel hydroxide.

[0056] In some of the examples, during the electrochemical treatment, the temperature of the alkaline solution of the phosphate is controlled at 50°C~60°C, for example, 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, or a range between any two of the above values.

[0057] In some examples, the phosphate in the phosphate alkaline solution includes at least one of potassium dihydrogen phosphate and dipotassium hydrogen phosphate.

[0058] In some of the examples, the concentration of phosphate in the alkaline solution of phosphate is 0.04-0.06 mol / L.

[0059] In some examples, the alkali solution of the phosphate salt contains KOH as the alkali.

[0060] In some of the examples, the concentration of the phosphate alkaline solution is 5 mol / L.

[0061] In some of the examples, in the electrochemical treatment, the voltage is 1.5V~2V, specifically 1.5V, 1.6V, 1.7V, 1.8V, 1.9V, 2V, etc. The time of the electrochemical treatment is 15min~30min, specifically 15min, 17min, 19min, 21min, 23min, 25min, 27min, 29min, 30min, etc.

[0062] In some examples, cobalt-doped nickel hydroxide is prepared by a method comprising the following steps:

[0063] The cobalt-doped nickel is immersed in an alkaline solution for reaction to prepare cobalt-doped nickel hydroxide.

[0064] In some of these examples, the base contained in the alkaline solution is KOH.

[0065] In some of the examples, the concentration of the alkaline solution is 5 mol / L.

[0066] In some examples, the temperature of the reaction is controlled at 85°C to 95°C, such as 85°C, 86°C, 87°C, 88°C, 89°C, 90°C, 91°C, 92°C, 93°C, 94°C, 95°C, etc. The reaction time is 2h to 4h, such as 2h, 2.2h, 2.4h, 2.6h, 2.8h, 3h, 3.2h, 3.4h, 3.6h, 3.8h, 4h, etc.

[0067] In some examples, cobalt-doped nickel is prepared by a method comprising the following steps:

[0068] Mixing cobalt-doped nickel oxide and polymer evenly to obtain a mixture;

[0069] The mixture is placed in a mixed atmosphere including hydrogen and nitrogen, the polymer is decomposed and removed at 400° C. to 500° C., and the cobalt-doped nickel oxide is reduced to obtain cobalt-doped nickel.

[0070] In some of the examples, the mass ratio of cobalt-doped nickel oxide to polymer is (10-15):1, for example 10:1, 10.5:1, 11:1, 11.5:1, 12:1, 12.5:1, 13:1, 13.5:1, 14:1, 15:1, etc.

[0071] In some examples, the polymer includes polypropylene carbonate.

[0072] In some of the examples, the volume ratio of hydrogen to nitrogen in the mixed atmosphere is 5:95.

[0073] In some of the examples, the air flow velocity of the mixed atmosphere is 4 m / s to 7 m / s, for example, 4 m / s, 4.5 m / s, 5 m / s, 5.5 m / s, 6 m / s, 6.5 m / s, 7 m / s, etc., or a range between any two of the above values.

[0074] In some examples, the steps of obtaining a uniform mixture of cobalt-doped nickel oxide and polymer include:

[0075] The cobalt-doped nickel oxide is crushed and then heated and mixed with the polymer.

[0076] In some of the examples, the heating temperature is 50°C~70°C, specifically 50°C, 52°C, 54°C, 56°C, 58°C, 60°C, 62°C, 64°C, 66°C, 68°C, 70°C, or a range between any two of the above values.

[0077] In some examples, the pulverization process includes grinding and sieving. The size of the obtained particles is 400-600 mesh, for example, 400 mesh, 420 mesh, 440 mesh, 460 mesh, 480 mesh, 500 mesh, 520 mesh, 540 mesh, 560 mesh, 580 mesh, 600 mesh, or a range between any two of the above values.

[0078] In some of these examples, a cell disruptor is used for shaking during the heating and mixing process.

[0079] The working power of the cell crusher is 1000W~1500W, for example, 1000W, 1100W, 1200W, 1300W, 1400W, 1500W, or a range between any two of the above values. The vibration treatment time is 10min~30min, for example, 10min, 15min, 20min, 25in, 30min, etc.

[0080] In some examples, cobalt-doped nickel oxide is prepared by a method comprising the following steps:

[0081] Nickel acetate, cobalt acetate and a thickener are dispersed in a solvent to obtain a precursor solution.

[0082] The precursor solution is subjected to electrostatic spinning to obtain precursor fibers.

[0083] The precursor fiber is calcined to obtain cobalt-doped nickel oxide.

[0084] In some of the examples, the mass ratio of cobalt acetate to nickel acetate is 1:(10-15), specifically 1:10, 1:10.5, 1:11, 1:11.5, 1:12, 1:12.5, 1:13, 1:13.5, 1:14, 1:14.5, 1:15, etc.

[0085] In some examples, the thickening agent includes polyvinyl pyrrolidone.

[0086] In some of the examples, the solvent includes acetic acid and ethanol in a mass ratio of 5 to 7:4.

[0087] In some of the examples, the voltage of the electrospinning process is 15 kV to 18 kV, for example, 15 kV, 15.3 kV, 15.6 kV, 16 kV, 16.3 kV, 16.6 kV, 17 kV, 17.3 kV, 17.6 kV, 18 kV, etc., or a range between any two of the above values.

[0088] In some of the examples, the calcination temperature is 300°C~500°C, for example 300°C, 320°C, 340°C, 360°C, 380°C, 400°C, 420°C, 440°C, 460°C, 480°C, 500°C, etc., or a range between any two of the above values.

[0089] The following specific examples are provided to further illustrate the present invention. The present invention provides the following specific examples for a better understanding of the present invention, but is not limited to the specific implementation methods and does not limit the protection scope of the present invention.

[0090] Example 1

[0091] The present embodiment provides a water electrolysis device 10, including a power generation device 500, a power storage device 600, an electrolysis chamber 100, a chemical oxygen evolution chamber 200, a power supply device 300, a first anode 410, a second anode 420, a cathode 430, a heating device 700, a first vibration device 810 and a second vibration device 820.

[0092] The power storage device 600 is connected to the power generation device 500 and the power supply device 300 to store the electric energy of the power generation device 500 and to supply power to the power supply device 300 .

[0093] The first anode 410, the second anode 420 and the cathode 430 are respectively connected to the power supply device 300. The first anode 410 and the cathode 430 are arranged in the electrolysis chamber 100. The second anode 420 is arranged in the chemical oxygen evolution chamber 200. The materials of the first anode 410 and the second anode 420 are porous phosphate pillared cobalt doped nickel hydroxide. The first anode 410 and the second anode 420 are connected in parallel, and the parallel circuit of the first anode 410 is provided with a first switch 310 for controlling the power on and off of the first anode 410. The parallel circuit of the second anode 420 is provided with a second switch 320 for controlling the power on and off of the second anode 420. The parallel circuit of the first anode 410 and the parallel circuit of the second anode 420 are connected to the positive wire of the power supply device 300 through the hinge device 330.

[0094] The electrolysis chamber 100 is connected to a hydrogen outlet pipe 110. The hydrogen outlet pipe 110 is provided with a first closure member 120 that can be closed or opened. The first closure member 120 is provided with a first handle 130. A first vent pipe 140 is connected to the side of the hydrogen outlet pipe 110. A first liquid hole 150 is provided at the lower end of the electrolysis chamber 100.

[0095] The chemical oxygen evolution chamber 200 is connected to an oxygen outlet pipe 210. The oxygen outlet pipe 210 is provided with a second sealing member 220 that can be closed or opened. A second handle 230 can be provided on the second sealing member 220. A second vent pipe 240 is connected to the side of the oxygen outlet pipe 210. A second liquid hole 250 is provided at the lower end of the chemical oxygen evolution chamber 200.

[0096] The heating device 700 is disposed in the chemical oxygen evolution chamber 200 . The first vibration device 810 is connected to the first anode 410 . The second vibration device 820 is connected to the second anode 420 .

[0097] In the above-mentioned water electrolysis device 10, after the first anode 410 in the electrolysis chamber 100 is energized to react and reaches the upper limit of the material capacity, the second anode 420 is energized to react, and after the oxygen is released, the first anode 410 is continuously energized to react. In this way, the first anode 410 and the second anode 420 are alternately energized to react, thereby realizing continuous hydrogen and oxygen production.

[0098] The preparation method of phosphate pillared cobalt doped nickel hydroxide comprises the following steps:

[0099] Step S1, preparation of cobalt-doped nickel oxide:

[0100] 10 parts of nickel acetate and 1 part of cobalt acetate were dissolved in a mixed solvent of acetic acid and ethanol in a mass ratio of 6:4, and mechanical stirring was adopted at a stirring speed of 500 r / min. 10 parts of polyvinyl pyrrolidone were added to the obtained solution, and then ultrasonic treatment was performed for 30 minutes at an ultrasonic power of 100 W to obtain a precursor solution.

[0101] The precursor solution was added into an electrospinning machine, the voltage was set to 15 kV, and electrospinning was performed to obtain membrane-like precursor fibers.

[0102] The precursor fiber is calcined at 300° C. to obtain a cobalt-doped nickel oxide fiber material.

[0103] Step S2, preparation of cobalt-doped nickel:

[0104] The cobalt-doped nickel oxide fiber material prepared in step S1 was ground and sieved with a mesh size of 400. 100 parts of the sieved cobalt-doped nickel oxide and 10 parts of polypropylene carbonate were heated and mixed at a mixing temperature of 50°C, and the mixed liquid was vibrated using a cell crusher at a power of 1000 W for 10 minutes. Subsequently, the mixed material was pressed with a press to obtain a sheet with a thickness of less than 1 cm, which was then cooled at room temperature and cut into 15 cm thick sheets. 2 size.

[0105] The cut materials are placed in a mixed atmosphere of hydrogen and nitrogen, with a ratio of hydrogen to nitrogen of 5:95 and a gas flow rate of 4 m / s. Polypropylene carbonate is decomposed in the mixed atmosphere, and cobalt-doped nickel oxide is reduced to cobalt-doped nickel with a porous structure in the mixed atmosphere.

[0106] Step S3, preparation of cobalt-doped nickel hydroxide:

[0107] The cobalt-doped nickel prepared in step S2 was immersed in a 5 mol / L alkaline solution for reaction at a reaction temperature of 85° C. for a reaction time of 2 h to prepare cobalt-doped nickel hydroxide.

[0108] Step S4, preparation of phosphate pillared cobalt doped nickel hydroxide:

[0109] Take the cobalt-doped nickel hydroxide prepared in step S3 and connect it to the positive electrode of the power supply, take metal nickel and connect it to the negative electrode of the power supply, immerse it in a 5 mol / L alkaline solution, and add 0.05 mol / L potassium dihydrogen phosphate. The temperature of the alkaline solution is controlled at 50°C, and electrochemical treatment is performed. The electrodeposition voltage is 1.5V, and the time is 15 minutes. Then, it is washed with deionized water and dried at 35°C to prepare phosphate-pillared cobalt-doped nickel hydroxide.

[0110] Example 2

[0111] The difference between this embodiment and embodiment 1 is that the preparation method of phosphate pillared cobalt doped nickel hydroxide comprises the following steps:

[0112] Step S1, preparation of cobalt-doped nickel oxide:

[0113] 15 parts of nickel acetate and 1 part of cobalt acetate were dissolved in a mixed solvent of acetic acid and ethanol in a mass ratio of 6:4, and mechanical stirring was adopted at a stirring speed of 1000 r / min. 20 parts of polyvinyl pyrrolidone were added to the obtained solution, and then ultrasonic treatment was performed for 60 minutes at an ultrasonic power of 500 W to obtain a precursor solution.

[0114] The precursor solution was added into an electrospinning machine, the voltage was set to 17 kV, and electrospinning was performed to obtain membrane-like precursor fibers.

[0115] The precursor fiber is calcined at 500° C. to obtain a cobalt-doped nickel oxide fiber material.

[0116] Step S2, preparation of cobalt-doped nickel:

[0117] The cobalt-doped nickel oxide fiber material prepared in step S1 was ground and sieved with a mesh size of 600. 150 parts of the sieved cobalt-doped nickel oxide and 10 parts of polypropylene carbonate were heated and mixed at a mixing temperature of 70°C, and the mixed liquid was vibrated using a cell crusher at a power of 1500 W for 30 minutes. Subsequently, the mixed material was pressed by a press to obtain a sheet with a thickness of less than 1.3 cm, which was then cooled at room temperature and cut into 15 cm thick sheets. 2 size.

[0118] The cut materials are placed in a mixed atmosphere of hydrogen and nitrogen, with a ratio of hydrogen to nitrogen of 5:95 and a gas flow rate of 7 m / s. Polypropylene carbonate is decomposed in the mixed atmosphere, and cobalt-doped nickel oxide is reduced to cobalt-doped nickel with a porous structure in the mixed atmosphere.

[0119] Step S3, preparation of cobalt-doped nickel hydroxide:

[0120] The cobalt-doped nickel prepared in step S2 was immersed in a 5 mol / L alkaline solution for reaction at a temperature of 95° C. for a reaction time of 4 h to prepare cobalt-doped nickel hydroxide.

[0121] Step S4, preparation of phosphate pillared cobalt doped nickel hydroxide:

[0122] Take the cobalt-doped nickel hydroxide prepared in step S3 and connect it to the positive electrode of the power supply, take metal nickel and connect it to the negative electrode of the power supply, immerse it in a 5 mol / L alkaline solution, and add 0.05 mol / L potassium dihydrogen phosphate. The temperature of the alkaline solution is controlled at 60°C, and electrochemical treatment is performed. The electrodeposition voltage is 2V and the time is 20 minutes. Then, it is washed with deionized water and dried at 50°C to prepare phosphate-pillared cobalt-doped nickel hydroxide.

[0123] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A water electrolysis device, characterized in that: The invention comprises an electrolysis chamber, a chemical oxygen evolution chamber, a first anode, a second anode and a cathode; the first anode and the cathode are arranged in the electrolysis chamber, the second anode is arranged in the chemical oxygen evolution chamber, the first anode and the second anode are connected in parallel and can control power on and off independently of each other.

2. The water electrolysis device according to claim 1, characterized in that: A first switch for controlling power on and off of the first anode is provided on the parallel circuit of the first anode, and a second switch for controlling power on and off of the second anode is provided on the parallel circuit of the second anode.

3. The water electrolysis device according to claim 1, characterized in that: The water electrolysis equipment further comprises a heating device, which is arranged in the chemical oxygen evolution chamber.

4. The water electrolysis device according to claim 1, characterized in that: The water electrolysis equipment further comprises a first vibration device, wherein the first vibration device is connected to the first anode; and / or The water electrolysis equipment further comprises a second vibration device, and the second vibration device is connected to the second anode.

5. The water electrolysis device according to claim 1, characterized in that: The water electrolysis equipment also includes a power supply device and a power generation device. The first anode, the second anode and the cathode are respectively connected to the power supply device. The power generation device is connected to the power supply device to supply power to the power supply device.

6. The water electrolysis device according to claim 5, characterized in that: The power generation device includes a solar cell.

7. The water electrolysis device according to claim 5, characterized in that: The water electrolysis equipment also includes an electricity storage device, which is connected to the power generation device and the power supply device to store the electric energy of the power generation device and supply power to the power supply device.

8. The water electrolysis device according to any one of claims 1 to 7, characterized in that: The material of the first anode and / or the second anode includes phosphate-pillared cobalt-doped nickel hydroxide.

9. The water electrolysis device according to claim 8, characterized in that: The phosphate pillared cobalt-doped nickel hydroxide is prepared by a method comprising the following steps: Cobalt-doped nickel hydroxide is connected to the positive electrode of a power source, and metal nickel is connected to the negative electrode of a power source, and immersed in an alkaline solution containing phosphate for electrochemical treatment to prepare the phosphate-pillared cobalt-doped nickel hydroxide.

10. The water electrolysis device according to any one of claims 1 to 7 and 9, characterized in that: The first anode and / or the second anode is a porous structure.

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