Embedded liquid storage cavity type seawater electrolysis device

Abstract

The utility model discloses an embedded liquid storage cavity type seawater electrolysis device, and relates to a seawater electrolysis hydrogen production device. The utility model aims to solve the technical problems of low gas production performance and high operation cost of the conventional water electrolysis bath. The seawater electrolysis device with the embedded liquid storage cavity is formed by sequentially connecting a cathode metal shell, a first outer waterproof rubber ring, a first inner waterproof rubber ring, a cathode fixing plastic plate, a cathode plate, a diaphragm, an anode plate, an anode fixing plastic plate, a second inner waterproof rubber ring, a second outer waterproof rubber ring and an anode metal shell, and grooves are formed in the cathode metal shell and the anode metal shell to serve as liquid storage cavities. The device is stable in operation and high in hydrogen production and oxygen production efficiency, and can be used in the field of hydrogen production by electrolyzing water.

Description

Technical Field

[0001] The utility model relates to a device for producing hydrogen by electrolyzing seawater. Background Art

[0002] Hydrogen energy is an energy source with a high calorific value. It is rich in sources and has no pollution to the environment. It has become the most popular secondary energy source. Currently, about 96% of the global hydrogen production relies on fossil fuels such as natural gas, coal and oil. The large amount of CO2 emissions generated in this process has undoubtedly brought great pressure to environmental protection work. Compared with traditional industrial hydrocarbon steam reforming technology, water electrolysis hydrogen production has attracted much attention for its advantages such as zero carbon emissions and simple process.

[0003] In the existing water electrolysis electrolyzer, the electrolyte flows rapidly over the catalyst surface under external pressure. If the flow rate is too fast, the reaction contact time between the electrolyte and the catalyst is reduced, resulting in a decrease in gas production performance. At the same time, since the flowing electrolyte has a short residence time in the electrolytic cell, the heating effect of the electrolyte is also reduced, which undoubtedly increases the operating cost. Utility Model Content

[0004] The utility model aims to solve the technical problems of low gas production performance and high operating cost of the existing water electrolysis electrolyzer, and provides a seawater electrolysis device with an embedded liquid storage cavity.

[0005] The utility model is an electrolytic seawater device with an embedded liquid storage cavity, which is composed of a cathode metal shell 1, a first outer waterproof rubber ring 2, a first inner waterproof rubber ring 3, a cathode fixing plastic plate 4, a cathode plate 5, a diaphragm 6, an anode plate 7, an anode fixing plastic plate 8, a second inner waterproof rubber ring 9, a second outer waterproof rubber ring 10, and an anode metal shell 11 connected in sequence;

[0006] The cathode metal shell 1 is in the shape of a straight quadrangular prism, and a first groove 1-9 is arranged in the center of the side surface, which is a liquid storage chamber; a liquid inlet 1-1 is arranged on the rear side surface of the straight quadrangular prism, a liquid outlet 1-2 is arranged on the front side surface of the straight quadrangular prism, and a heating hole 1-3, a temperature probe hole 1-4 and an exhaust hole 1-5 are arranged on the upper bottom surface of the straight quadrangular prism; an outer rubber ring groove 1-6 and an inner rubber ring groove 1-7 are arranged around the groove on the left side surface, and a first connecting hole 1-8 is also arranged on the left side surface;

[0007] The first outer waterproof rubber ring 2 is fixed in the outer rubber ring groove 1-6, and the first inner waterproof rubber ring 3 is fixed in the inner rubber ring groove 1-7;

[0008] The cathode plate 5 is in the shape of a flat plate, with a second groove 5-1 on the right side of the plate, and a square first through hole 5-2 is arranged in the second groove 5-1; a terminal 5-3 is arranged above the cathode plate 5; the second groove 5-1 is used to fix the catalyst sheet;

[0009] The cathode fixing plastic plate 4 is also in the shape of a flat plate, and a plate groove 4-1 whose shape matches the outer contour of the cathode plate 5 is provided on the left side of the plate, and a square second through hole 4-2 is provided in the plate groove 4-1, and a second connecting hole 4-3 is provided at the edge of the cathode fixing plastic plate 4; the cathode plate 5 is embedded in the plate groove 4-1 of the cathode fixing plastic plate 4;

[0010] The centroids of the first groove 1-9, the first through hole 5-2, and the second through hole 4-2 are on the same straight line;

[0011] The diaphragm 6 is a flat plate; a third connecting hole 6-1 is provided at the edge of the flat plate;

[0012] The axes of the corresponding first connection holes 1-8, second connection holes 4-3, and third connection holes 6-1 are on the same straight line for bolt connection;

[0013] The structure of the anode plate 7 is symmetrical to that of the cathode plate 5 with the plane where the diaphragm 6 is located as the symmetry axis;

[0014] The structure of the anode fixed plastic plate 8 is symmetrical with the structure of the cathode fixed plastic plate 4 with the plane where the diaphragm 6 is located as the symmetry axis;

[0015] The structure of the anode metal housing 11 is symmetrical with the structure of the cathode metal housing 1 with the plane where the diaphragm 6 is located as the symmetry axis;

[0016] The first outer waterproof rubber ring 2 has the same structure as the second outer waterproof rubber ring 10;

[0017] The first inner waterproof rubber ring 3 and the second inner waterproof rubber ring 9 have the same structure.

[0018] Furthermore, the connection described in step one is to fix the cathode metal shell 1, the first outer waterproof rubber ring 2, the first inner waterproof rubber ring 3, the cathode fixing plastic plate 4, the cathode plate 5, the diaphragm 6, the anode plate 7, the anode fixing plastic plate 8, the second inner waterproof rubber ring 9, the second outer waterproof rubber ring 10, and the anode metal shell 11 together in sequence with bolts.

[0019] Furthermore, the diaphragm 6 is a non-woven fabric diaphragm or an anion exchange membrane, which is used to prevent the mixing of hydrogen and oxygen in the electrolyte. At the same time, the diaphragm can allow specific ions to pass through, but prevent the passage of other ions, which helps to maintain the electrical neutrality of the electrolyte during the electrolysis process and optimize the electrolysis efficiency; in addition, the diaphragm helps to prevent the electrolysis reaction products from re-reacting on the electrodes.

[0020] Furthermore, the catalyst sheet fixed in the second groove 5 - 1 of the cathode plate 5 is a nickel mesh sheet or a ruthenium dioxide sheet.

[0021] Furthermore, the catalyst sheet fixed at the groove of the anode plate 7 is a nickel mesh sheet or an iridium dioxide sheet.

[0022] After the cathode metal shell 1, the first outer waterproof rubber ring 2, the first inner waterproof rubber ring 3, the cathode fixing plastic plate 4, the cathode plate 5, the diaphragm 6, the anode plate 7, the anode fixing plastic plate 8, the second inner waterproof rubber ring 9, the second outer waterproof rubber ring 10, and the anode metal shell 11 of the utility model are connected together in sequence, a liquid storage cavity is formed on the cathode side and the anode side respectively, and a seawater electrolysis device with an embedded liquid storage cavity is obtained. The heating rod is placed in the liquid storage cavity through the heating hole 1-3, and the temperature probe is also placed in the liquid storage cavity through the temperature probe hole 1-4. The connection terminal of the anode plate 7 (oxygen evolution catalytic electrode) is connected to the positive electrode of the power supply, and the connection terminal 5-3 of the cathode plate 5 (hydrogen evolution catalytic electrode) is connected to the negative electrode of the power supply, and the electrolyte (such as seawater) is input into the liquid storage cavity through the liquid inlet. After the electrolyte is heated, the power supply is turned on to perform water electrolysis. The oxygen evolution catalytic electrode, the hydrogen evolution catalytic electrode and the electrolyte form a loop, and the ions in the electrolyte are transferred to the corresponding electrode positions through the diaphragm. The catalyst in the oxygen evolution catalytic electrode fully contacts and reacts with the heated electrolyte to generate oxygen, and the catalyst in the hydrogen evolution catalytic electrode fully contacts and reacts with the heated electrolyte to generate hydrogen. The electrolyte then flows out from the liquid outlet, and the exhaust hole on one side of the cathode metal shell collects hydrogen, and the exhaust hole on one side of the anode metal shell collects oxygen. During the operation, the device is infused, heated, and current is applied to achieve efficient hydrogen and oxygen production by electrolysis of seawater. The device can adapt to different water electrolysis conditions by replacing the diaphragm. The device of the utility model has a simple structure and solves the problems of the inability to store liquid and the difficulty in producing hydrogen and oxygen by electrolyzing seawater in the existing water electrolysis technology.

[0023] The utility model is designed with a liquid storage cavity formed on the cathode side and the anode side respectively, and the electrolyte is supplemented through the liquid inlet and outlet channels. The electrolyte flowing in is stored and heated in the embedded cavity and water electrolysis is carried out, thereby realizing sustainable operation of the water electrolysis device and solving the problems of the inability to store liquid and high operating costs in the existing water electrolysis technology.

[0024] The seawater electrolysis device with an embedded liquid storage cavity of the utility model has the following advantages:

[0025] (1) The built-in liquid storage chamber can store the electrolyte that flows through. Providing electrolyte storage space allows the electrolyte and catalyst to have sufficient contact and reaction time. At the same time, providing electrolyte storage space can reduce the heating time of the electrolyte and improve the hydrogen and oxygen production efficiency of the electrolyzer.

[0026] (2) The provision of an embedded liquid storage chamber can increase the space within the electrolytic cell and buffer the release of gas generated by the catalyst, thereby reducing the gas pressure within the electrolytic cell and improving the stability and safety of the electrolytic cell.

[0027] (3) The embedded liquid storage chamber and diaphragm are set up to realize the production of hydrogen and oxygen at different times and in different spaces, solving the problem of hydrogen and oxygen mixing in the electrolyte; the transfer of ions between the anode electrode unit and the cathode electrode unit is realized, solving the problem of ion balance in the electrolyte.

[0028] (4) The diaphragm can be replaced according to the change of the electrolysis conditions of the water. By replacing different types of functional diaphragms, the device can perform hydrogen and oxygen production under a variety of different electrolysis conditions, thereby realizing a water electrolysis device that can perform water electrolysis under a variety of water electrolysis conditions, and solving the adaptability problem of the water electrolysis device.

[0029] (5) The seawater electrolysis device with an embedded liquid storage cavity of the utility model has a simple structure and is connected and fixed by reinforcing screws, so it is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a seawater electrolysis device with an embedded liquid storage cavity of the utility model;

[0031] Figure 2 It is a schematic front view of the structure of the seawater electrolysis device with an embedded liquid storage cavity of the utility model;

[0032] Figure 3 is a schematic structural diagram of the cathode metal shell 1;

[0033] Figure 4 is a schematic structural diagram of the cathode plate 5;

[0034] Figure 5 is a schematic structural diagram of the cathode plate 5;

[0035] Figure 6 is a schematic structural diagram of the cathode fixing plastic plate 4;

[0036] Figure 7 is a schematic diagram of the structure of the diaphragm 6;

[0037] Figure 8 This is a curve showing the relationship between current density and voltage when the electrolysis device with an embedded liquid storage cavity is used in Example 1 and a nickel mesh is used as a catalyst for electrolysis;

[0038] Fig. 9 This is a graph showing the relationship between the operating time and potential of the seawater electrolysis device with an embedded liquid storage cavity in Example 2, using a nickel mesh as a catalyst and 1M KOH as an electrolyte.

[0039] In the figure: 1 is a cathode metal shell, 1-1 is a liquid inlet, 1-2 is a liquid outlet, 1-3 is a heating hole, 1-4 is a temperature probe hole, 1-5 is an exhaust hole, 1-6 is an outer rubber ring groove, 1-7 is an inner rubber ring groove, 1-8 is a first connecting hole, 1-9 is a first groove, 2 is a first outer waterproof rubber ring, 3 is a first inner waterproof rubber ring, 4 is a cathode fixing plastic plate, 4-1 is a plate groove, 4-2 is a second through hole, 4-3 is a second connecting hole, 5 is a cathode plate, 5-1 is a second groove, 5-2 is a first through hole; 5-3 is a terminal, 6 is a diaphragm, 6-1 is a third connecting hole, 7 is an anode plate, 8 is an anode fixing plastic plate, 9 is a second inner waterproof rubber ring, 10 is a second outer waterproof rubber ring, and 11 is an anode metal shell. DETAILED DESCRIPTION

[0040] The following examples are used to verify the beneficial effects of the present invention:

[0041] Embodiment 1: The embedded liquid storage cavity type seawater electrolysis device of this embodiment is composed of a cathode metal shell 1, a first outer waterproof rubber ring 2, a first inner waterproof rubber ring 3, a cathode fixing plastic plate 4, a cathode plate 5, a diaphragm 6, an anode plate 7, an anode fixing plastic plate 8, a second inner waterproof rubber ring 9, a second outer waterproof rubber ring 10, and an anode metal shell 11 which are tightly connected in sequence by bolts;

[0042] The cathode metal shell 1 is in the shape of a straight quadrangular prism, and a first groove 1-9 is arranged in the center of the side surface, which is a liquid storage chamber; a liquid inlet 1-1 is arranged on the rear side surface of the straight quadrangular prism, a liquid outlet 1-2 is arranged on the front side surface of the straight quadrangular prism, and a heating hole 1-3, a temperature probe hole 1-4 and an exhaust hole 1-5 are arranged on the upper bottom surface of the straight quadrangular prism; an outer rubber ring groove 1-6 and an inner rubber ring groove 1-7 are arranged around the groove on the left side surface, and a first connecting hole 1-8 is also arranged on the left side surface;

[0043] The first outer waterproof rubber ring 2 is fixed in the outer rubber ring groove 1-6, and the first inner waterproof rubber ring 3 is fixed in the inner rubber ring groove 1-7;

[0044] The cathode plate 5 is in the shape of a flat plate, with a second groove 5-1 on the right side of the plate, and a square first through hole 5-2 is arranged in the second groove 5-1; a terminal 5-3 is arranged above the cathode plate 5; the second groove 5-1 is used to fix the catalyst sheet;

[0045] The cathode fixing plastic plate 4 is also in the shape of a flat plate, and a plate groove 4-1 whose shape matches the outer contour of the cathode plate 5 is provided on the left side of the plate, and a square second through hole 4-2 is provided in the plate groove 4-1, and a second connecting hole 4-3 is provided at the edge of the cathode fixing plastic plate 4; the cathode plate 5 is embedded in the plate groove 4-1 of the cathode fixing plastic plate 4;

[0046] The centroids of the first groove 1-9, the first through hole 5-2, and the second through hole 4-2 are on the same straight line;

[0047] The diaphragm 6 is a flat non-woven fabric diaphragm; a third connecting hole 6-1 is provided on the edge of the flat plate;

[0048] The axes of the corresponding first connection holes 1-8, second connection holes 4-3, and third connection holes 6-1 are on the same straight line for bolt connection;

[0049] The structure of the anode plate 7 is symmetrical to that of the cathode plate 5 with the plane where the diaphragm 6 is located as the symmetry axis;

[0050] The structure of the anode fixed plastic plate 8 is symmetrical with the structure of the cathode fixed plastic plate 4 with the plane where the diaphragm 6 is located as the symmetry axis;

[0051] The structure of the anode metal housing 11 is symmetrical with the structure of the cathode metal housing 1 with the plane where the diaphragm 6 is located as the symmetry axis;

[0052] The first outer waterproof rubber ring 2 has the same structure as the second outer waterproof rubber ring 10;

[0053] The first inner waterproof rubber ring 3 and the second inner waterproof rubber ring 9 have the same structure;

[0054] The catalyst sheet fixed in the second groove 5-1 of the cathode plate 5 is a pre-treated nickel mesh sheet, and the catalyst sheet fixed in the groove of the anode plate 7 is also a pre-treated nickel mesh sheet; the pre-treatment process of the nickel mesh is: cut the commercial nickel mesh into 5×5 cm 2 , place the cut commercial nickel mesh in 3M HCl and ultrasonically clean it for 5 minutes, rinse the commercial nickel mesh after ultrasonic cleaning with deionized water, and place it in acetone and ultrasonically clean it for 5 minutes, rinse the commercial nickel mesh after ultrasonic cleaning with acetone with ethanol, and place it in ethanol and ultrasonically clean it for 5 minutes, wipe the commercial nickel mesh after ultrasonic cleaning with ethanol with absorbent paper, dry it, and complete the pretreatment.

[0055] The heating rod is placed in the liquid storage cavity through the heating hole 1-3, and the temperature probe is also placed in the liquid storage cavity through the temperature probe hole 1-4. The connection terminal of the anode plate 7 (oxygen evolution catalytic electrode) is connected to the positive electrode of the power supply, and the connection terminal 5-3 of the cathode plate 5 (hydrogen evolution catalytic electrode) is connected to the negative electrode of the power supply. 6M KOH + natural seawater is used as the electrolyte, and the electrolyte is input into the liquid storage cavity through the liquid inlet. The electrolyte is electrolyzed under two conditions: at room temperature and when heated to 60°C. The current gradient of the power supply is set to 250mV, 500mV, 750mV, 1000mV, 1250mV, 1500mV, 1750mV, 2000mV, 2250mV, 2500mV, 3750mV, 5000mV, 6250mV, 7500mV, 8750mV, and 10000mV. To achieve a current density gradient of 10mA cm -2 , 20mA cm -2 、30mA cm -2 , 40mA cm -2 , 50mA cm -2 、60mA cm -2 , 70mA cm -2 、80mAcm -2 , 90mA cm -2 , 100mA cm -2 , 150mA cm -2 , 200mA cm -2 , 250mA cm -2 、300mA cm -2 、350mAcm -2 、400mAcm -2 The device was tested for Lsv using linear sweep voltammetry. The voltage data corresponding to the collected current density was collected to obtain a curve of the relationship between current density and potential as shown in Figure 8 As shown. Figure 8 It can be seen that the voltage required to achieve the corresponding current density is relatively low when the seawater electrolysis device with an embedded liquid storage cavity is used as the catalyst in the present embodiment.

[0056] Example 2: This example is different from Example 1 in that the electrolyte is 1M KOH solution. The other aspects are the same as Example 1. The current of the power supply is set to 10A, that is, the current density is 400mA cm -2 The device was tested using the chronopotentiometry. The potential data corresponding to the collected time was collected to obtain a time-potential diagram such as Fig. 9 As shown. Fig. 9 It can be seen that the seawater electrolysis device with an embedded liquid storage cavity in this embodiment uses a nickel mesh as a catalyst, and has high electrolysis stability and good safety.

Claims

1. A seawater electrolysis device with an embedded liquid storage cavity, characterized in that The device is formed by sequentially connecting a cathode metal shell (1), a first outer waterproof rubber ring (2), a first inner waterproof rubber ring (3), a cathode fixing plastic plate (4), a cathode plate (5), a diaphragm (6), an anode plate (7), an anode fixing plastic plate (8), a second inner waterproof rubber ring (9), a second outer waterproof rubber ring (10), and an anode metal shell (11); The cathode metal shell (1) is in the shape of a straight quadrangular prism, with a first groove (1-9) provided in the center of the side surface, which is a liquid storage chamber; a liquid inlet (1-1) is provided on the rear side surface of the straight quadrangular prism, a liquid outlet (1-2) is provided on the front side surface of the straight quadrangular prism, and a heating hole (1-3), a temperature probe hole (1-4) and an exhaust hole (1-5) are provided on the upper bottom surface of the straight quadrangular prism; an outer rubber ring groove (1-6) and an inner rubber ring groove (1-7) are provided on the left side surface around the groove, and a first connection hole (1-8) is also provided on the left side surface; The first outer waterproof rubber ring (2) is fixed in the outer rubber ring groove (1-6), and the first inner waterproof rubber ring (3) is fixed in the inner rubber ring groove (1-7); The cathode plate (5) is in the shape of a flat plate, a second groove (5-1) is opened on the right side of the plate, and a square first through hole (5-2) is arranged in the second groove (5-1); a terminal (5-3) is arranged above the cathode plate (5); the second groove (5-1) is used to fix the catalyst sheet; The cathode fixing plastic plate (4) is also in the shape of a flat plate, and a plate groove (4-1) whose shape matches the outer contour of the cathode plate (5) is arranged on the left side of the plate, and a square second through hole (4-2) is arranged in the plate groove (4-1), and a second connection hole (4-3) is arranged at the edge of the cathode fixing plastic plate (4); the cathode plate (5) is embedded in the plate groove (4-1) of the cathode fixing plastic plate (4); The centroids of the first groove (1-9), the first through hole (5-2), and the second through hole (4-2) are on the same straight line; The diaphragm (6) is a flat plate; a third connection hole (6-1) is provided on the edge of the flat plate; The axes of the corresponding first connection holes (1-8), second connection holes (4-3) and third connection holes (6-1) are on the same straight line and are used for bolt connection; The structure of the anode plate (7) is symmetrical with the structure of the cathode plate (5) with the plane where the diaphragm (6) is located as the symmetry axis; The structure of the anode fixing plastic plate (8) is symmetrical with the structure of the cathode fixing plastic plate (4) with the plane where the diaphragm (6) is located as the symmetry axis; The structure of the anode metal shell (11) is symmetrical with the structure of the cathode metal shell (1) with the plane where the diaphragm (6) is located as the symmetry axis; The first outer waterproof rubber ring (2) and the second outer waterproof rubber ring (10) have the same structure; The first inner waterproof rubber ring (3) and the second inner waterproof rubber ring (9) have the same structure.

2. The seawater electrolysis device with an embedded liquid storage cavity according to claim 1 is characterized in that The connection is achieved by fixing the cathode metal shell (1), the first outer waterproof rubber ring (2), the first inner waterproof rubber ring (3), the cathode fixing plastic plate (4), the cathode plate (5), the diaphragm (6), the anode plate (7), the anode fixing plastic plate (8), the second inner waterproof rubber ring (9), the second outer waterproof rubber ring (10), and the anode metal shell (11) together in sequence by bolts.

3. The seawater electrolysis device with an embedded liquid storage cavity according to claim 1, characterized in that: The diaphragm (6) is a non-woven fabric diaphragm or an anion exchange membrane.

4. The seawater electrolysis device with an embedded liquid storage cavity according to claim 1, characterized in that: The catalyst sheet fixed in the second groove (5-1) of the cathode plate (5) is a nickel mesh sheet or a ruthenium dioxide sheet.

5. The device for electrolyzing seawater with an embedded liquid storage cavity according to claim 1, characterized in that: The catalyst sheet fixed at the groove of the anode plate (7) is a nickel mesh sheet or an iridium dioxide sheet.

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