Sandwich type hydrogen-oxygen fuel cell experiment teaching device

Abstract

The utility model provides a sandwich type hydrogen-oxygen fuel cell experiment teaching device, and relates to the technical field of experiment teaching equipment, a discharge reaction group is fixed between a positive electrode flow channel group and a negative electrode flow channel group, and the positive electrode flow channel group, the negative electrode flow channel group and the discharge reaction group are fixed through insulating bolts; according to the positive electrode runner set, a first cover plate is arranged on one side of a positive electrode runner plate, a snakelike airflow runner is arranged in the middle of the positive electrode runner plate, an air inlet cavity is formed in one end of the snakelike airflow runner of the positive electrode runner plate, an exhaust cavity is formed in the other end of the snakelike airflow runner of the positive electrode runner plate, a positive conductive column is installed on the positive electrode runner plate, an oxygen guide column is installed on the first cover plate, and a first exhaust hole is formed in the first cover plate. The first cover plate is provided with a positive conductive column through hole. And the discharge reaction group is formed by installing a proton exchange membrane between a positive electrode aluminum foil and a negative electrode aluminum foil. According to the utility model, the snake-shaped air flow channels are arranged on the electrode plates, so that the reaction of hydrogen and oxygen is facilitated, and a good catalytic effect is achieved; and due to the design of the plane structure, the H2 adsorption efficiency of the electrode is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to experimental teaching equipment technical field especially a kind of sandwich type hydrogen-oxygen fuel cell experimental teaching device. BACKGROUND

[0002] The existing teaching material experimental device, reference Figure 1 Solution is loaded in U-shaped tube, two ports of U-shaped tube are placed into graphite rod respectively, graphite rod contacts solution, and the other end of graphite rod is connected with wire to carry out experiment, with following several shortcomings:

[0003] (1) source level: the open system of U-shaped tube leads to the large escape of H2, O2 generated by electrolysis, and the effective supply rate is low, so the chemical energy that can be provided is less;

[0004] (2) process level: the adsorption and catalytic dissociation capacity of graphite rod to H2, O2 are weak, and the catalytic rate is low, so the electric energy that can be provided is less;

[0005] (3) result level: electrode spacing is large (after laboratory commonly used U-shaped tube is placed into graphite rod, the spacing between positive electrode and negative electrode is 5cm), and contact area is small (only connected by electrolyte in the bottom pipeline of U-shaped tube), leading to large internal resistance, low energy conversion rate, so the electric energy that can be converted is less;

[0006] (4) graphite is not absolute inert electrode, and there are residual "valence" and "hanging key" on its surface, can chemisorb oxygen in air, lead to the existence of hydroxyl, ketone, quinone, peroxyl and other surface functional groups, these functional groups can participate in electrochemical reaction;And graphite is layered structure, and substances in electrolyte can be embedded in its interlayer space during electrolysis, change charge and discharge performance. Moreover, the research results of different researchers on graphite rod activation treatment are completely opposite, so it is difficult to guarantee scientificity. SUMMARY

[0007] The utility model provides a kind of sandwich type hydrogen-oxygen fuel cell experimental teaching device to solve the problem of low catalytic rate and low energy conversion rate of existing experimental teaching device.

[0008] In order to solve the technical problem, the utility model adopts the following technical scheme: a kind of sandwich type hydrogen-oxygen fuel cell experimental teaching device, the discharge reaction group is fixed between the positive flow channel group and the negative flow channel group, and the positive flow channel group, the negative flow channel group and the discharge reaction group are fixed by insulating bolt.

[0009] The positive flow channel group is provided with a cover plate one on one side of the positive flow channel plate, a serpentine gas flow channel is arranged in the middle of the positive flow channel plate, the serpentine gas flow channel of the positive flow channel plate has an air inlet cavity at one end and an air outlet cavity at the other end, a positive conductive column is installed on the positive flow channel plate, an oxygen gas guide column is installed on the cover plate one, an air outlet hole one is arranged on the cover plate one, a rubber plug one is movably arranged on the air outlet hole one, and a positive conductive column passing hole is arranged on the cover plate one.

[0010] The negative flow channel group is provided with a cover plate two on one side of the negative flow channel plate, a serpentine gas flow channel is arranged in the middle of the negative flow channel plate, the serpentine gas flow channel of the negative flow channel plate has an air inlet cavity at one end and an air outlet cavity at the other end, a negative conductive column is installed on the negative flow channel plate, a hydrogen gas guide column is installed on the cover plate two, an air outlet hole two is arranged on the cover plate two, a rubber plug two is movably arranged on the air outlet hole two, and a negative conductive column passing hole is arranged on the cover plate two.

[0011] The discharge reaction group is provided with a proton exchange membrane between the positive aluminum foil and the negative aluminum foil, and air holes are uniformly arranged on the positive aluminum foil and the negative aluminum foil.

[0012] The positive conductive column passes through the positive conductive column passing hole, electrically contacts the positive aluminum foil through the positive flow channel plate, and the negative conductive column passes through the negative conductive column passing hole, electrically contacts the negative aluminum foil through the negative flow channel plate.

[0013] The oxygen gas guide column corresponds to the air inlet cavity of the positive flow channel plate, the air outlet hole one corresponds to the air outlet cavity of the positive flow channel plate, the hydrogen gas guide column corresponds to the air inlet cavity of the negative flow channel plate, and the air outlet hole two corresponds to the air outlet cavity of the negative flow channel plate.

[0014] A sealing gasket one is arranged between the positive flow channel plate and the cover plate one, a sealing gasket two is arranged between the negative flow channel plate and the cover plate two, and the sealing gaskets are used to maintain air tightness.

[0015] Further, the positive aluminum foil is coated with hexagonal system nano graphene on both sides, the negative aluminum foil is coated with hexagonal system nano graphene on both sides, and the positive aluminum foil and the negative aluminum foil cover the serpentine gas flow channel respectively.

[0016] Further, the positive flow channel plate, the negative flow channel plate, the cover plate one and the cover plate two are all insulating plates.

[0017] Further, a separately arranged base is further included, support plates one and two are fixed on the base, and open grooves are formed on the support plates one and two, and a limiting groove is formed between the support plates one and two, and the positive flow channel group, the negative flow channel group and the discharge reaction group are placed in the limiting groove after assembly.

[0018] Further, reinforcing ribs are fixed on the outer sides of the support plates one and two.

[0019] The utility model discloses beneficial effect is: (1) H2, O2 directly from the outside, guarantee the amount and purity of H2, O2, the maximum feature of fuel cell " fuel continuity and external supply " is reflected, (2) positive flow channel board and negative flow channel board all designed serpentine airflow channel, to increase H2, O2 gas path and the contact area with the coated hexagonal system nanometer graphene aluminum foil, reach good catalytic effect, (3) the positive and negative two pole flow channel board is cut off with proton exchange membrane, greatly shorten the interval, and each is in its own position, relatively independent, avoid mutual interference.

[0020] The discharge reaction group has: (1) aluminum foil is base material, common and easy to get, not only conductive, and small resistance, positive pole aluminum foil and negative pole aluminum foil are cut by laser, punch, and the hexagonal system nanometer graphene is coated on both sides of the aluminum foil, and the catalytic layer is made, and H2 can be catalyzed and dissociated efficiently, (2) the design of the plane structure increases the electrode surface area, according to the resistance law R = pL / S , the resistance of the electrode itself is reduced, and the adsorption efficiency of the electrode to H2 is greatly improved, which is better than the columnar structure of the graphite rod. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The utility model discloses a hydrogen-oxygen fuel cell device teaching aid;

[0022] Figure 2 It is the front view structural schematic diagram of the utility model after assembly;

[0023] Figure 3 It is the side view structural schematic diagram of the utility model after assembly;

[0024] Figure 4 It is the overhead view structural schematic diagram of the utility model after assembly;

[0025] Figure 5 It is the exploded view of the utility model (aluminum foil and proton exchange membrane are schematic diagram, actually very thin);

[0026] Figure 6 It is the schematic diagram of the positive electrode piece of the utility model;

[0027] Figure 7 It is the schematic diagram of the negative electrode piece of the utility model;

[0028] Figure 8 It is the schematic diagram of the aluminum foil of the utility model;

[0029] Figure 9 It is the schematic diagram of the cover plate one of the utility model;

[0030] Figure 10 It is the schematic diagram of the cover plate two of the utility model;

[0031] Figure 11 It is the front view schematic view of the base of the utility model;

[0032] Figure 12 It is the side view schematic view of the base of the utility model;

[0033] Figure 13 It is the plan view of the base of the utility model;

[0034] Figure 14 It is the assembly schematic view of the utility model;

[0035] Figure 15 It is the demonstration flow reference drawing of the utility model.

[0036] In the drawing: 1. cover plate one, 2. sealing gasket one, 3. positive flow channel plate, 4. discharge reaction group, 5. negative flow channel plate, 6. sealing gasket two, 7. cover plate two, 8. insulating bolt, 9. oxygen gas guide column, 10. positive conductive column, 11. positive pole aluminum foil, 12. proton exchange membrane, 13. negative pole aluminum foil, 14. hydrogen gas guide column, 15. negative conductive column, 16. hydrogen-oxygen fuel cell device teaching aid, 17. rubber plug one, 18. rubber plug two, 19. base, 20. support plate one, 21. support plate two, 22. reinforcing rib, 23. limiting groove, 24. oxygen gas guide column through hole, 25. positive conductive column through hole, 26. hydrogen gas guide column through hole, 27. negative conductive column through hole, 28. air inlet cavity, 29. air outlet cavity, 30. serpentine gas flow channel, 31. air outlet hole one, 32. air outlet hole two, 33. air gap slot. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model.

[0038] Reference Figures 2-13 A kind of interlayer formula hydrogen-oxygen fuel cell experimental teaching device, discharge reaction group 4 is fixed between the positive flow channel group and negative flow channel group, and positive flow channel group, negative flow channel group, discharge reaction group 4 are fixed by insulating bolt 8;

[0039] The positive flow channel group is provided with cover plate one 1 on one side of positive flow channel plate 3, and the middle part of positive flow channel plate 3 is provided with a serpentine airflow channel, one end of the serpentine airflow channel of positive flow channel plate 3 is provided with an air inlet cavity, the other end is provided with an air outlet cavity, positive conductive column 10 is installed on positive flow channel plate 3, oxygen gas guide column 9 is installed on cover plate one 1, air outlet hole one 31 is arranged on cover plate one 1, rubber plug one 17 is movably arranged on air outlet hole one 31, and positive conductive column passing hole 25 is arranged on cover plate one 1; oxygen gas guide column 9 corresponds to the air inlet cavity of positive flow channel plate 3, air outlet hole one 31 corresponds to the air outlet cavity of positive flow channel plate 3; after assembly, the bottom of oxygen gas guide column 9 is communicated with the air inlet cavity, rubber plug one 17 blocks the air outlet cavity through air outlet hole one 31 to realize sealing, and oxygen gas guide column 9 and positive conductive column 10 are provided with threads, and oxygen gas guide column 9 and positive conductive column 10 are connected with cover plate one 1 through threads;

[0040] The negative flow channel group is provided with cover plate two 7 on one side of negative flow channel plate 5, and the middle part of negative flow channel plate 5 is provided with a serpentine airflow channel, one end of the serpentine airflow channel of negative flow channel plate 5 is provided with an air inlet cavity, the other end is provided with an air outlet cavity, negative conductive column 15 is installed on negative flow channel plate 5, hydrogen gas guide column 14 is installed on cover plate two 7, air outlet hole two 32 is arranged on cover plate two 7, rubber plug two 18 is movably arranged on air outlet hole two 32, and negative conductive column passing hole 28 is arranged on cover plate two 7; hydrogen gas guide column 14 corresponds to the air inlet cavity of negative flow channel plate 5, air outlet hole two 32 corresponds to the air outlet cavity of negative flow channel plate 5; after assembly, the bottom of hydrogen gas guide column 14 is communicated with the air inlet cavity, rubber plug two 18 blocks the air outlet cavity through air outlet hole two 32 to realize sealing, hydrogen gas guide column 14 and negative conductive column 15 are provided with threads, and hydrogen gas guide column 14 and negative conductive column 15 are connected with cover plate two 7 through threads;

[0041] The discharge reaction group 4 is provided with proton exchange membrane 12 between positive aluminum foil 11 and negative aluminum foil 13, and air holes are uniformly arranged on positive aluminum foil 11 and negative aluminum foil 13;

[0042] Positive conductive column 10 passes through positive conductive column passing hole 25, and positive flow channel plate 3 is in electrical contact with positive aluminum foil 11, and negative conductive column 15 passes through negative conductive column passing hole 28, negative flow channel plate 5 is in electrical contact with negative aluminum foil 13;

[0043] The discharge reaction group 4 is directly pressed between the positive flow channel group and the negative flow channel group, and slight air leakage does not affect the reaction of the device.

[0044] Further, the two surfaces of positive aluminum foil 11 are coated with hexagonal system nano graphene, the two surfaces of negative aluminum foil 13 are coated with hexagonal system nano graphene, and positive aluminum foil 11 and negative aluminum foil 13 cover the serpentine airflow channel respectively.

[0045] Further, the sealing gasket one 2 is arranged between the positive flow channel plate 3 and the cover plate one 1, and the sealing gasket two 6 is arranged between the negative flow channel plate 5 and the cover plate two 7, and the sealing gaskets are used for maintaining air tightness.

[0046] Further, the positive flow channel plate 3, the negative flow channel plate 5, the cover plate one 1 and the cover plate two 7 are all insulating plates.

[0047] Further, a base 19 is separately arranged, the base is fixed with a support plate one 20 and a support plate two 21, the support plate one 20 and the support plate two 21 are formed with open grooves 33, and the support plate one 20 and the support plate two 21 form a limiting groove 23, and the positive flow channel group, the negative flow channel group and the discharge reaction group are placed in the limiting groove 23 after assembly.

[0048] The outer side of the support plate one 20 and the support plate two 21 is welded with reinforcing ribs 22;

[0049] The support plate two 21 is obtained by rotating the support plate one 20 by 180 degrees, the open grooves 33 on the support plate one 20 are used for limiting the oxygen gas guide column or the hydrogen gas guide column, and the open grooves 33 on the support plate two 21 are used for limiting the oxygen gas guide column or the hydrogen gas guide column.

[0050] The positive aluminum foil and the negative aluminum foil are the same aluminum foil, and the positions of the air holes on the aluminum foil cover the entire serpentine gas flow channel.

[0051] The positive conductive column and the negative conductive column are convenient to use by using metal bolts.

[0052] The cover plate one and the cover plate two are made of transparent acrylic or opaque acrylic.

[0053] The positive flow channel group, the negative flow channel group and the discharge reaction group are connected by fitting and are fixed and assembled by insulating bolts.

[0054] The air inlet cavity, the air outlet cavity and the serpentine gas flow channel have the same function on the positive flow channel plate and the negative flow channel plate and do not need to be marked.

[0055] Working principle:

[0056] The utility model fits and connects the positive electrode flow channel group, the negative electrode flow channel group, and the discharge reaction group together, and then fixes the assembly with insulating bolts. After the assembly is completed, the device is placed on the base, and hoses are installed on the two gas guide columns. Hydrogen and oxygen are turned on at the same time. Oxygen enters the positive electrode flow channel group through the hose, and hydrogen enters the negative electrode flow channel group through the hose. The gas is inflated for 1 to 2 seconds. When the two serpentine air flow channels are respectively filled with hydrogen and oxygen, the exhaust cavities of the two flow channel groups are respectively blocked with rubber plugs 1 and 2 to form a sealed device. After passing through the serpentine air flow channels, hydrogen dissociates into hydrogen atoms under the catalysis of the negative electrode aluminum foil. The hydrogen atoms lose electrons and become hydrogen ions. The hydrogen ions pass through the proton exchange membrane and enter the positive electrode aluminum foil. After passing through the serpentine air flow channels, oxygen encounters the positive electrode aluminum foil, obtains electrons on the positive electrode aluminum foil, and reacts with the hydrogen ions to generate water.

[0057] The complete teaching aid operation process of this utility model is as follows (reference Figure 15 ):

[0058] (1) Assemble and connect instruments

[0059] Connect the oxygen gas column with a rubber tube and introduce oxygen. Connect the hydrogen gas column with a rubber tube and introduce hydrogen. Connect the positive conductive column to the positive electrodes of the current sensor and voltage sensor respectively through wires. Connect the negative conductive column to the negative electrodes of the current sensor and voltage sensor respectively through wires. Connect the LongWill -2A~+2A current sensor and the LongWill -20V~+20V voltage sensor to the I and II interfaces of the LongWill data logger respectively through wires. Connect the data logger to the USB interface of the computer through a wire.

[0060] (2) Set current sensor parameters

[0061] Open DISLab 6.9 software, click the "Combined Line 1" button, click the "Add" button, a window will pop up, enter "Name" in the "Name" column I - t In the graph, select "Time" in the "x-axis" column and "Time" in the "y-axis" column. I , select "Red" in the "Graph Color" column, select the default "20" in the "Sampling Frequency" column, and then click "Zero" to eliminate the influence of ambient current;

[0062] (3) Set voltage sensor parameters

[0063] The steps are the same as (2), but you need to click the "Combined Line 2" button and enter U - t In the graph, select " U Click the "Cascade Window" button, "Combined Chart 1 I -t Figure and "combined graph 2 U - t Figure" appears in the same panel, facilitating simultaneous observation;

[0064] (4) measure the current / voltage, save I - t 、 U - t Figure

[0065] Continuously pass in hydrogen / oxygen, connect the positive and negative electrodes of the current / voltage sensor with the positive and negative conductive columns 10, 15 respectively, click the "start" button on the DISLab 6.9 software panel, simultaneously measure the current / voltage data in real time, and make the I - t 、 U - t Figure.

[0066] The operation process of the utility model (1) assembles and connects the instrument, and LongWill is the English name of the brand.

[0067] Through the above description, those skilled in the art can make simple changes and modifications without deviating from the scope of the technical concept of the utility model, and all should fall within the protection scope of the utility model.

Claims

1. A sandwich type hydrogen and oxygen fuel cell experimental teaching device, characterized in that: A discharge reaction group is fixed between the positive electrode flow channel group and the negative electrode flow channel group, and the positive electrode flow channel group, the negative electrode flow channel group, and the discharge reaction group are fixed by insulating bolts; The positive electrode flow channel group is provided with a cover plate 1 on one side of the positive electrode flow channel plate, a serpentine airflow channel is provided in the middle of the positive electrode flow channel plate, one end of the serpentine airflow channel of the positive electrode flow channel plate has an air inlet cavity, and the other end has an exhaust cavity, a positive conductive column is installed on the positive electrode flow channel plate, an oxygen gas guide column is installed on the cover plate 1, an exhaust hole 1 is provided on the cover plate 1, a rubber plug 1 is movably provided on the exhaust hole 1, and a positive conductive column passage hole is provided on the cover plate 1; The negative electrode flow channel group is provided with a second cover plate on one side of the negative electrode flow channel plate, a serpentine airflow channel is provided in the middle of the negative electrode flow channel plate, one end of the serpentine airflow channel of the negative electrode flow channel plate has an air inlet cavity, and the other end has an exhaust cavity, a negative conductive column is installed on the negative electrode flow channel plate, a hydrogen gas guide column is installed on the second cover plate, a second exhaust hole is provided on the second cover plate, a second rubber plug is movably provided on the second exhaust hole, and a negative conductive column passage hole is provided on the second cover plate; The discharge reaction group is a proton exchange membrane installed between the positive electrode aluminum foil and the negative electrode aluminum foil, and ventilation holes are evenly arranged on the positive electrode aluminum foil and the negative electrode aluminum foil; The positive conductive column passes through the positive conductive column through hole, the positive electrode flow channel plate and is in electrical contact with the positive electrode aluminum foil, and the negative conductive column passes through the negative conductive column through hole, the negative electrode flow channel plate and is in electrical contact with the negative electrode aluminum foil; The oxygen gas guide column corresponds to the air inlet cavity of the positive electrode flow channel plate, the exhaust hole 1 corresponds to the exhaust cavity of the positive electrode flow channel plate, the hydrogen gas guide column corresponds to the air inlet cavity of the negative electrode flow channel plate, and the exhaust hole 2 corresponds to the exhaust cavity of the negative electrode flow channel plate; A first sealing gasket is provided between the positive electrode flow channel plate and the first cover plate, and a second sealing gasket is provided between the negative electrode flow channel plate and the second cover plate, and the sealing gaskets are used to maintain air tightness.

2. A sandwich type hydrogen and oxygen fuel cell experimental teaching device according to claim 1, characterized in that: Both sides of the positive electrode aluminum foil are coated with hexagonal nano-graphene, and both sides of the negative electrode aluminum foil are coated with hexagonal nano-graphene. The positive electrode aluminum foil and the negative electrode aluminum foil respectively cover the serpentine airflow channel.

3. The sandwich type hydrogen and oxygen fuel cell experimental teaching device according to claim 1 is characterized in that: The positive electrode flow channel plate, the negative electrode flow channel plate, the first cover plate and the second cover plate are all insulating plates.

4. A sandwich type hydrogen and oxygen fuel cell experimental teaching device according to claim 1, 2 or 3, characterized in that: It also includes a separately arranged base, on which support plate 1 and support plate 2 are fixed, empty slots are formed on support plate 1 and support plate 2, and a limiting slot is formed between support plate 1 and support plate 2, and the positive electrode flow channel group, negative electrode flow channel group, and discharge reaction group are assembled and placed in the limiting slot.

5. The sandwich type hydrogen and oxygen fuel cell experimental teaching device according to claim 4 is characterized in that: Reinforcing ribs are fixed on the outer sides of the support plate 1 and the support plate 2.

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