A hydrogen storage catalyst and its preparation method and application in hydrogen fuel cells

Abstract

The present invention provides a hydrogen storage catalyst, a preparation method thereof, and an application in a hydrogen fuel cell, belonging to the field of new energy technology. The preparation method of the hydrogen storage catalyst provided by the present invention comprises: electroplating a cobalt-phosphorus coating on the surface of a nickel substrate to obtain a hydrogen storage catalyst; the electroplating voltage is 8.5 to 9.5 V, the electroplating time is 4.5 to 5.5 minutes, and the electroplating temperature is 25 to 35°C. By optimizing the electroplating voltage, time, and temperature, the present invention can improve the quality of the cobalt-phosphorus coating, resulting in a granular cobalt-phosphorus coating with extended branches at the protrusions, thereby improving the hydrogen storage catalyst's resistance to seawater corrosion.

Description

Technical Field

[0001] The present invention belongs to the field of new energy technology, and specifically relates to a hydrogen storage catalyst, a preparation method thereof, and an application in a hydrogen fuel cell. Background Art

[0002] Hydrogen energy is an energy carrier that promotes the larger-scale development and utilization of renewable energy. Sodium borohydride, also known as sodium tetrahydroborate, is a cost-effective hydrogen storage material in which boron exists in a trivalent state and hydrogen exists in a negative monovalent state. The theoretical weight hydrogen storage capacity of sodium borohydride is 10.8wt%. In aqueous solution, 1 mol of sodium borohydride can provide 4 mol of hydrogen. The self-hydrolysis kinetics of sodium borohydride are slow, and a catalyst needs to be added to promote hydrolysis. Although precious metal catalysts are effective, they have poor seawater corrosion resistance, which affects their lifespan. Therefore, how to improve the catalyst to improve the seawater corrosion resistance of the catalyst has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0003] The present invention aims to provide a hydrogen storage catalyst, a preparation method thereof, and its application in hydrogen fuel cells. The hydrogen storage catalyst prepared by the preparation method provided by the present invention has excellent seawater corrosion resistance and thus has a long service life.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The present invention provides a method for preparing a hydrogen storage catalyst, comprising:

[0006] Electroplating a cobalt-phosphorus coating on the surface of a nickel substrate to obtain a hydrogen storage catalyst;

[0007] The electroplating voltage is 8.5-9.5V, the electroplating time is 4.5-5.5min, and the electroplating temperature is 25-35°C.

[0008] Preferably, the nickel substrate comprises nickel foam.

[0009] Preferably, the electroplating solution used in the electroplating comprises cobalt salt, phosphate and a complexing agent.

[0010] Preferably, the concentration of the cobalt salt in the electroplating solution is 0.05-0.15 mol / L.

[0011] Preferably, the concentration of phosphate in the electroplating solution is 0.05-0.15 mol / L.

[0012] Preferably, the electroplating voltage is 8.8~9.2V.

[0013] Preferably, the electroplating time is 4.8 to 5.2 minutes.

[0014] Preferably, the electroplating temperature is 28-32°C.

[0015] The present invention also provides a hydrogen storage catalyst prepared by the preparation method described in the above technical solution.

[0016] The present invention also provides the use of the hydrogen storage catalyst described in the above technical solution in a hydrogen fuel cell.

[0017] The present invention provides a method for preparing a hydrogen storage catalyst, comprising: preparing a cobalt-phosphorus coating by electroplating on the surface of a nickel substrate to obtain a hydrogen storage catalyst; the electroplating voltage is 8.5-9.5V, the electroplating time is 4.5-5.5min, and the electroplating temperature is 25-35°C. By optimizing the electroplating voltage, time, and temperature, the present invention can improve the quality of the cobalt-phosphorus coating, so that the cobalt-phosphorus coating appears granular and has extended branches at the protrusions, thereby improving the seawater corrosion resistance of the hydrogen storage catalyst. Experimental results show that the corrosion rate of the hydrogen storage catalyst prepared by the preparation method provided by the present invention is reduced to 0.6162angs / min, and the hydrogen production rate reaches 8.9mL·min -1 cm -2 . BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Polarization curves of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4;

[0019] Figure 2 Graph showing the corrosion rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4;

[0020] Figure 3 Graph showing the hydrogen production rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4;

[0021] Figure 4 Graph showing the R values ​​of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4;

[0022] Figure 5 Polarization curves of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5 to 7;

[0023] Figure 6 Graph showing the corrosion rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5 to 7;

[0024] Figure 7 Graph showing the hydrogen production rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5 to 7;

[0025] Figure 8 Graph showing the R values ​​of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5 to 7;

[0026] Figure 9 Polarization curves of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8-10;

[0027] Figure 10 Graph showing the corrosion rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8 to 10;

[0028] Figure 11 Graph showing the hydrogen production rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8-10;

[0029] Figure 12 Graph showing the R values ​​of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8 to 10;

[0030] Figure 13 This is a microscopic morphology of nickel foam in Example 1;

[0031] Figure 14 for Figure 13 Enlarged view of the box;

[0032] Figure 15 This is a microscopic morphology of the hydrogen storage catalyst coating prepared in Example 1;

[0033] Figure 16 for Figure 15 Enlarged view of the box;

[0034] Figure 17 This is a microscopic morphology of the hydrogen storage catalyst coating prepared in Comparative Example 2;

[0035] Figure 18 for Figure 17 Enlarged view of the box;

[0036] Figure 19 This is a microscopic morphology of the hydrogen storage catalyst coating prepared in Comparative Example 3;

[0037] Figure 20 for Figure 19 Enlarged view of the box. DETAILED DESCRIPTION

[0038] The present invention provides a method for preparing a hydrogen storage catalyst, comprising:

[0039] Electroplating a cobalt-phosphorus coating on the surface of a nickel substrate to obtain a hydrogen storage catalyst;

[0040] The electroplating voltage is 8.5-9.5V, the electroplating time is 4.5-5.5min, and the electroplating temperature is 25-35°C.

[0041] The present invention has no particular limitation on the sources of the raw materials, and commercially available products known to those skilled in the art may be used.

[0042] The invention prepares a cobalt-phosphorus coating by electroplating on the surface of a nickel substrate to obtain a hydrogen storage catalyst.

[0043] In the present invention, the nickel substrate preferably comprises nickel foam. The present invention has no particular limitation on the size of the nickel foam, and the size of the nickel foam can be adjusted according to actual needs.

[0044] As an embodiment, the nickel foam may be 1*1*1cm 3 cube.

[0045] In the present invention, the electroplating solution preferably comprises a cobalt salt, a phosphate, and a complexing agent. The cobalt salt is used to provide the cobalt required for the cobalt-phosphorus coating; the phosphate is used to provide the phosphorus required for the cobalt-phosphorus coating; and the complexing agent can increase the conductivity of the electroplating solution, shorten the electroplating time, form a complexing effect with metal ions, promote catalyst formation, and make the electroplating solution weakly alkaline, thereby inhibiting corrosion.

[0046] In the present invention, the concentration of the cobalt salt in the electroplating solution is preferably 0.05 to 0.15 mol / L. As an embodiment, the concentration of the cobalt salt in the electroplating solution can be 0.08 mol / L, 0.1 mol / L or 0.12 mol / L.

[0047] In the present invention, the cobalt salt is preferably CoSO4·7H2O. CoSO4·7H2O is relatively common and easily available, and sulfate ions have little effect on corrosion.

[0048] In the present invention, the concentration of phosphate in the electroplating solution is preferably 0.05 to 0.15 mol / L. As an embodiment, the concentration of phosphate in the electroplating solution can be 0.08 mol / L, 0.1 mol / L or 0.12 mol / L.

[0049] In the present invention, the phosphate is preferably NaHPO 3 . In the present invention, NaHPO 3 is easy to purchase and obtain.

[0050] In the present invention, the concentration of the complexing agent in the electroplating solution is preferably 0.01 to 0.03 mol / L. As an embodiment, the concentration of the complexing agent in the electroplating solution can be 0.02 mol / L.

[0051] In the present invention, the complexing agent is preferably an organic acid salt. The present invention has no particular limitation on the specific type of the organic acid salt, and organic acid salts well known to those skilled in the art can be used.

[0052] As an embodiment, the organic acid salt may be sodium citrate.

[0053] In the present invention, the solvent of the electroplating solution is preferably water. The present invention has no particular limitation on the preparation method of the electroplating solution, as long as the concentration of each component is ensured to meet the requirements.

[0054] In the present invention, the electroplating voltage is 8.5-9.5 V, preferably 8.8-9.2 V. As an embodiment, the electroplating voltage can be 9 V.

[0055] In the present invention, the electroplating time is 4.5 to 5.5 minutes, preferably 4.8 to 5.2 minutes. As an embodiment, the electroplating time can be 5 minutes.

[0056] In the present invention, the electroplating temperature is 25-35° C., preferably 28-32° C. As an embodiment, the electroplating temperature can be 30° C.

[0057] The present invention can improve the quality of the cobalt-phosphorus coating by optimizing the voltage, time and temperature of electroplating, so that the cobalt-phosphorus coating appears granular and has extended branches at the protrusions, thereby improving the seawater corrosion resistance of the hydrogen storage catalyst.

[0058] The present invention also provides a hydrogen storage catalyst prepared by the preparation method described in the above technical solution.

[0059] The hydrogen storage catalyst provided by the present invention has excellent seawater corrosion resistance, excellent catalytic performance (hydrogen production performance) and a long service life.

[0060] The present invention also provides the use of the hydrogen storage catalyst described in the above technical solution in a hydrogen fuel cell.

[0061] The present invention has no special limitation on the application of the hydrogen storage catalyst in a hydrogen fuel cell, and any application operation familiar to those skilled in the art may be used.

[0062] In the present invention, the hydrogen storage catalyst is preferably used in hydrogen production from NaBH4.

[0063] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0064] The instrument used in the embodiments and comparative examples is a pulse rectifier, model MODEL.

[0065] Example 1

[0066] A method for preparing a hydrogen storage catalyst is as follows:

[0067] Electroplating a cobalt-phosphorus coating on the surface of a nickel substrate to obtain a hydrogen storage catalyst;

[0068] The nickel substrate is nickel foam, 1*1*1cm 3 Cube;

[0069] The plating solution used for electroplating was an aqueous solution of 0.1 mol / L CoSO4·7H2O+0.1 mol / L NaHPO3+0.02 mol / L sodium citrate;

[0070] The electroplating voltage is 9V, the electroplating time is 5 minutes, and the electroplating temperature is 30°C.

[0071] Comparative Example 1

[0072] Based on Example 1, only the voltage was changed to 7V, and other conditions remained unchanged.

[0073] Comparative Example 2

[0074] Based on Example 1, only the voltage was changed to 8V, and other conditions remained unchanged.

[0075] Comparative Example 3

[0076] Based on Example 1, only the voltage was changed to 10V, and other conditions remained unchanged.

[0077] Comparative Example 4

[0078] Based on Example 1, only the voltage was changed to 11V, and other conditions remained unchanged.

[0079] The polarization curves of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4 were tested in an electrochemical workstation to obtain the corrosion rate. The relationship curve between the hydrogen production volume and time was then obtained by the water displacement method. The slope of the curve was the hydrogen production rate.

[0080] Corrosion rate test method: Electrochemical corrosion tests were performed on the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4 using a DH7006B electrochemical workstation. The test solution was a 3.5 wt% sodium chloride solution. First, an open circuit potential test was performed for 900 seconds to stabilize the electrochemical system. Then, a polarization curve test was performed with a test potential range of -0.9 V to -0.4 V and a scan rate of 0.5 mV / s. After the test, the corrosion current density (I corr), and then the corrosion rate is calculated by Faraday's formula. The selection range of the Tafel zone is: the anode interval is the open circuit potential of +0.06V to +0.12V, and the cathode interval is the open circuit potential of -0.06V to -0.12V. The polarization curves and corrosion rate diagrams of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4 are as follows: Figures 1 and 2 As shown, Figure 1 Polarization curves of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4; Figure 2 This is a graph showing the corrosion rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4.

[0081] from Figure 2 It can be seen that the corrosion rate is 0.8091angs / min when the electroplating voltage is 7V, the corrosion rate is 0.6631angs / min when the voltage is 8V, the corrosion rate is 0.6162angs / min when the voltage is 9V, the corrosion rate is 1.7641angs / min when the voltage is 10V, and the corrosion rate is 2.5045angs / min when the voltage is 11V (1angs=0.1nm).

[0082] Test method for hydrogen production rate: connect two narrow-necked bottles with rubber tubes, one of which is filled with water, and the other is a sodium borohydride reaction container. Connect the mouth of the gas collecting bottle to the measuring cylinder through a rubber tube to ensure a tight connection to prevent gas leakage. The measuring cylinder is used to collect the water discharged by the hydrogen produced by the reaction, thereby measuring the volume of hydrogen. Use 5wt% sodium borohydride solution to fully contact the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4, respectively, and start the reaction to produce hydrogen. Hydrogen will enter the gas collecting bottle through the rubber tube, discharge the water in the gas collecting bottle, and the water will flow into the measuring cylinder. From the start of the reaction, start a stopwatch to record the time at the same time. During the reaction, observe and record the volume of water in the measuring cylinder every 30s. This volume is the volume of hydrogen produced in the corresponding time. The hydrogen production volume of 10 minutes of reaction is obtained, and the data is organized into a hydrogen production rate graph as shown below. Figure 3 As shown, Figure 3 Graph showing the hydrogen production rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1-4.

[0083] from Figure 3 It can be seen that when the electroplating voltage is 7V, the hydrogen production rate is 4.2mL·min -1 cm -2 When the voltage is 8V, the hydrogen production rate is 5.3mL·min -1 cm -2 When the voltage is 9 V, the hydrogen production rate is 8.9 mL min -1 cm -2 When the voltage is 10 V, the hydrogen production rate is 9.2 mL min-1 cm -2 When the voltage is 11 V, the hydrogen production rate is 9.5 mL min -1 cm -2 .

[0084] A parameter R = hydrogen production rate / corrosion rate is designed. The larger the R value, the greater the hydrogen production rate and the smaller the corrosion rate. A hydrogen storage catalyst with both hydrogen production performance and a longer life can be obtained.

[0085] The R values ​​of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 1 to 4 are shown in FIG. Figure 4 shown.

[0086] from Figure 4 It can be seen that when the electroplating voltage is 7V, the R value is 5.19mL·cm -2 ·angs, when the voltage is 8V, the R value is 7.99mL·cm -2 ·angs, when the voltage is 9V, the R value is 14.44mL·cm -2 ·angs, when the voltage is 10V, the R value is 5.21mL·cm -2 ·angs, when the voltage is 11V, the R value is 3.79mL·cm -2 ·angs.

[0087] In summary, the hydrogen storage catalyst of Example 1 (voltage is 9 V) has excellent seawater corrosion resistance, good hydrogen production performance and long life.

[0088] Comparative Example 5

[0089] On the basis of Example 1, only the electroplating time was changed to 4 minutes, and other conditions remained unchanged.

[0090] Comparative Example 6

[0091] On the basis of Example 1, only the electroplating time was changed to 6 minutes, and other conditions remained unchanged.

[0092] Comparative Example 7

[0093] On the basis of Example 1, only the electroplating time was changed to 7 minutes, and other conditions remained unchanged.

[0094] The polarization curves of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5 to 7 were tested in an electrochemical workstation to obtain the corrosion rate. The relationship curve between the hydrogen production volume and time was then obtained by the water displacement method. The slope of the curve was the hydrogen production rate. The testing methods for the corrosion rate and hydrogen production rate and the calculation of the R value were the same as those described above and will not be repeated here.

[0095] Figure 5Polarization curves of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5 to 7; Figure 6 Graph showing the corrosion rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5-7.

[0096] from Figure 6 It can be seen that when the electroplating time is 4 minutes, the corrosion rate is 0.7206 angs / min, when the electroplating time is 5 minutes, the corrosion rate is 0.6162 angs / min, when the electroplating time is 6 minutes, the corrosion rate is 0.7055 angs / min, and when the electroplating time is 7 minutes, the corrosion rate is 0.9849 angs / min.

[0097] Figure 7 Graph showing the hydrogen production rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5-7.

[0098] from Figure 7 It can be seen that the hydrogen production rate is 5.7 mL min when the electroplating time is 4 min. -1 cm -2 When the electroplating time is 5 min, the hydrogen production rate is 8.9 mL·min -1 cm -2 When the electroplating time is 6 min, the hydrogen production rate is 7.6 mL min -1 cm -2 When the electroplating time is 7 min, the hydrogen production rate is 7.2 mL min -1 cm -2 .

[0099] Figure 8 Graph showing the R values ​​of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 5-7.

[0100] from Figure 8 It can be seen that when the electroplating time is 4 minutes, the R value is 7.91 mL·cm -2 ·angs, the R value is 14.44mL·cm when the electroplating time is 5min -2 ·angs, the R value is 10.77mL·cm when the electroplating time is 6min -2 ·angs, the R value is 7.31mL·cm when the electroplating time is 7min -2 ·angs.

[0101] In summary, the hydrogen storage catalyst of Example 1 (electroplating time is 5 minutes) has excellent seawater corrosion resistance, good hydrogen production performance and long life.

[0102] Comparative Example 8

[0103] On the basis of Example 1, only the electroplating temperature was changed to 40° C., and other conditions remained unchanged.

[0104] Comparative Example 9

[0105] On the basis of Example 1, only the electroplating temperature was changed to 50° C., and other conditions remained unchanged.

[0106] Comparative Example 10

[0107] On the basis of Example 1, only the electroplating temperature was changed to 60° C., and other conditions remained unchanged.

[0108] The hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8 to 10 were tested for polarization curves in an electrochemical workstation and the corrosion rate was obtained. The relationship curve between hydrogen production volume and time was obtained by the water displacement method. The slope of the curve was the hydrogen production rate. The test methods for the corrosion rate and hydrogen production rate and the calculation of the R value were the same as those described above and will not be repeated here.

[0109] Figure 9 Polarization curves of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8-10; Figure 10 This is a graph showing the corrosion rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8-10.

[0110] from Figure 10 It can be seen that when the electroplating temperature is 30°C, the corrosion rate is 0.6162angs / min, when the electroplating temperature is 40°C, the corrosion rate is 0.6998angs / min, when the electroplating temperature is 50°C, the corrosion rate is 0.8003angs / min, and when the electroplating temperature is 60°C, the corrosion rate is 0.6515angs / min.

[0111] Figure 11 Graph showing the hydrogen production rates of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8-10.

[0112] from Figure 11 It can be seen that when the electroplating temperature is 30℃, the hydrogen production rate is 8.9mL·min -1 cm -2 When the electroplating temperature is 40℃, the hydrogen production rate is 5.2mL·min -1 cm -2 When the electroplating temperature is 50℃, the hydrogen production rate is 4.3mL·min -1 cm -2 When the electroplating temperature is 60℃, the hydrogen production rate is 4mL·min -1 cm -2 .

[0113] Figure 12Graph showing the R values ​​of the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 8-10.

[0114] from Figure 12 It can be seen that when the electroplating temperature is 30℃, the R value is 14.44mL·cm -2 ·angs, when the plating temperature is 40℃, the R value is 7.43mL·cm -2 ·angs, when the plating temperature is 50℃, the R value is 5.37mL·cm -2 ·angs, when the plating temperature is 60℃, the R value is 6.14mL·cm -2 ·angs.

[0115] In summary, the hydrogen storage catalyst of Example 1 (electroplating temperature is 30° C.) has excellent seawater corrosion resistance, good hydrogen production performance and long life.

[0116] The nickel foam in Example 1, the hydrogen storage catalysts prepared in Example 1 and Comparative Examples 2-3 were observed microscopically. Figures 13 to 20 As shown, Figure 13 is the microscopic morphology of nickel foam in Example 1, Figure 14 for Figure 13 Enlarged view of the box; Figure 15 This is a microscopic morphology of the hydrogen storage catalyst coating prepared in Example 1. Figure 16 for Figure 15 Enlarged view of the box; Figure 17 This is a microscopic morphology of the hydrogen storage catalyst coating prepared in Comparative Example 2. Figure 18 for Figure 17 Enlarged view of the box; Figure 19 This is a microscopic morphology of the hydrogen storage catalyst coating prepared in Comparative Example 3. Figure 20 for Figure 19 Enlarged view of the box.

[0117] from Figures 13 to 20 It can be seen that when the electroplating voltage is 9V, the coating can be completely plated, and the coating is granular, with extended branches at the protrusions; when the electroplating voltage is 8V, the coating partially falls off and is not completely plated; when the electroplating voltage is 10V, the coating falls off and cracks are generated due to the thickening of the coating.

[0118] Example 2

[0119] A method for preparing a hydrogen storage catalyst is as follows:

[0120] Electroplating a cobalt-phosphorus coating on the surface of a nickel substrate to obtain a hydrogen storage catalyst;

[0121] The nickel substrate is nickel foam, 1*1*1cm 3 Cube;

[0122] The plating solution used for electroplating was an aqueous solution of 0.05 mol / L CoSO4·7H2O+0.05 mol / L NaHPO3+0.03 mol / L sodium citrate;

[0123] The electroplating voltage is 8.5 V, the electroplating time is 5.5 min, and the electroplating temperature is 25° C.

[0124] Example 3

[0125] A method for preparing a hydrogen storage catalyst is as follows:

[0126] Electroplating a cobalt-phosphorus coating on the surface of a nickel substrate to obtain a hydrogen storage catalyst;

[0127] The nickel substrate is nickel foam, 1*1*1cm 3 Cube;

[0128] The plating solution used for electroplating was an aqueous solution of 0.15 mol / L CoSO4·7H2O+0.15 mol / L NaHPO3+0.01 mol / L sodium citrate;

[0129] The electroplating voltage was 9.5 V, the electroplating time was 4.5 min, and the electroplating temperature was 35° C.

[0130] Example 4

[0131] A method for preparing a hydrogen storage catalyst is as follows:

[0132] Electroplating a cobalt-phosphorus coating on the surface of a nickel substrate to obtain a hydrogen storage catalyst;

[0133] The nickel substrate is nickel foam, 1*1*1cm 3 Cube;

[0134] The plating solution used for electroplating was an aqueous solution of 0.1 mol / L CoSO4·7H2O+0.1 mol / L NaHPO3+0.02 mol / L sodium citrate;

[0135] The electroplating voltage was 8.8 V, the electroplating time was 5.2 min, and the electroplating temperature was 32° C.

[0136] The test methods for the corrosion rate and hydrogen production rate and the calculation of the R value are the same as those described above and will not be repeated here.

[0137] The corrosion rate of the hydrogen storage catalyst prepared in Example 2 is 0.6354 angs / min, the corrosion rate of the hydrogen storage catalyst prepared in Example 3 is 0.6457 angs / min, and the corrosion rate of the hydrogen storage catalyst prepared in Example 4 is 0.6542 angs / min.

[0138] The hydrogen production rate of the hydrogen storage catalyst prepared in Example 2 was 7.1 mL min -1 cm -2 The hydrogen production rate of the hydrogen storage catalyst prepared in Example 3 is 7.4 mL·min -1 cm -2 The hydrogen production rate of the hydrogen storage catalyst prepared in Example 4 was 7.8 mL·min -1 cm -2 .

[0139] The R value of the hydrogen storage catalyst prepared in Example 2 was 11.17 mL·cm -2 ·angs, the R value of the hydrogen storage catalyst prepared in Example 3 is 11.46mL·cm -2 ·angs, the R value of the hydrogen storage catalyst prepared in Example 4 is 11.92mL·cm -2 ·angs.

[0140] It can be seen from the examples that the hydrogen storage catalyst prepared by the preparation method provided by the present invention has excellent seawater corrosion resistance and thus has a long service life.

[0141] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for preparing a hydrogen storage catalyst, characterized in that: include: Electroplating a cobalt-phosphorus coating on the surface of a nickel substrate to obtain a hydrogen storage catalyst; The electroplating voltage is 8.5-9.5V, the electroplating time is 4.5-5.5min, and the electroplating temperature is 25-35°C; The electroplating solution used in the electroplating comprises a cobalt salt, a phosphate and a complexing agent; The concentration of cobalt salt in the electroplating solution is 0.05-0.15 mol / L; The concentration of phosphate in the electroplating solution is 0.05-0.15 mol / L; The concentration of the complexing agent in the electroplating solution is 0.01-0.03 mol / L; The complexing agent is an organic acid salt; The organic acid salt is sodium citrate.

2. The preparation method according to claim 1, characterized in that The nickel substrate includes nickel foam.

3. The preparation method according to claim 1, characterized in that The voltage of the electroplating is 8.8~9.2V.

4. The preparation method according to claim 1, characterized in that The electroplating time is 4.8 to 5.2 minutes.

5. The preparation method according to claim 1, characterized in that The electroplating temperature is 28-32°C.

6. The hydrogen storage catalyst prepared by the preparation method according to any one of claims 1 to 5.

7. Use of the hydrogen storage catalyst according to claim 6 in a hydrogen fuel cell.

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