Electrode material for large-scale fuel cell power supply of data center and preparation method thereof

Abstract

The application relates to an electrode material for large-scale fuel cell power supply of a data center and a preparation method, wherein the electrode material is a composite material of gold nanomaterial and graphene nanotube, the mass fraction of the gold nanomaterial is 0-65% of the graphene nanotube. After the graphene nanotube is prepared into a graphene nanotube solution, a certain mass fraction of gold nanomaterial is added, dispersion is carried out, and centrifugalization is carried out to prepare an electrode material solution; and then the electrode material solution is coated on a proton exchange membrane to prepare the electrode material. Compared with a traditional Pt or carbon nanotube electrode, the electrode material prepared by the application shows higher electrocatalytic performance, the cathode current is increased by 3.738 muA at most, and the reduction potential is reduced by 0.507 V. The application provides a preparation method of an electrode material for a large-scale hydrogen fuel cell power supply scene, reduces the manufacturing cost of a PEM fuel cell membrane electrode material, and improves the electrochemical performance of the fuel cell.

Description

TECHNICAL FIELD

[0001] The application relates to an electrode material of a proton exchange membrane hydrogen fuel cell, in particular to an electrode material for large-scale fuel cell power supply of a data center and a preparation method. BACKGROUND

[0002] With the development of global Internet, big data, artificial intelligence and other fields, the demand for energy of data centers has greatly increased, and people have made certain researches on alternative energy systems. The fuel conversion rate of a fossil fuel power generation system is only about 40%, and about 60% of fuel energy is lost in the form of heat energy, and primary energy reserves are gradually decreasing. Compared with traditional power supply systems, fuel cells have the characteristics of low energy cost, among which, a proton exchange membrane fuel cell has the advantages of high conversion efficiency, clean and environmentally friendly, wide raw material, fast start and quiet operation.

[0003] The selection of the electrode material of the proton exchange membrane fuel cell must consider its battery performance, such as cost-effectiveness and electrochemical activity. In order to improve the performance of the fuel cell, the electrode structural material is very important. Platinum and iridium are commonly used catalytic materials for the cathode oxygen reduction reaction of the proton exchange membrane fuel cell, and the expensive cost limits the application of hydrogen fuel cells in large-scale power generation.

[0004] The single-layer graphene film has the advantages of large specific surface area, good electrical conductivity and good catalytic activity, and its application prospect in the proton exchange membrane fuel cell is relatively broad. Graphene also has the ability of fast proton transport and selective ion separation. Therefore, by introducing modified graphene material in the catalytic process, the efficiency of the fuel cell is improved. The published patent document WO 02 / 41432 provides a preparation method of a proton exchange membrane for a fuel cell, and a blue diode is used to irradiate an electrode or a catalyst containing nano-carbon material. The published patent document CN 201810020140.3 uses graphene black phosphorene heterojunction as the anode / cathode main body of the hydrogen fuel cell, improves the electrical performance of the fuel cell, and reduces the manufacturing cost. SUMMARY

[0005] In view of the problems existing in the above-mentioned proton exchange membrane fuel cell, the purpose of the application is to provide an electrode material for large-scale hydrogen fuel cell power supply of a data center and a preparation method, so as to reduce the high cost of the PEM fuel cell membrane electrode material and improve the electrochemical performance of the fuel cell.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows:

[0007] The application provides an electrode material for large-scale fuel cell power supply of a data center, which is a composite material of gold nanomaterial and graphene nanotube; the added mass fraction of the gold nanomaterial is 0-65% of the mass of the graphene nanotube.

[0008] Preferably, the added mass fraction of the gold nanomaterial is 20-62.5% of the mass of the graphene nanotube, more preferably 40-62.5% of the mass of the graphene nanotube, and most preferably 62.5% of the mass of the graphene nanotube.

[0009] Preferably, the preparation method of the graphene nanotube is as follows:

[0010] A1, dissolving multi-walled carbon nanotubes in acid and stirring to prepare graphene nanobands;

[0011] A2, adding KMnO4 to the graphene nanobands and maintaining pH<3.0, and then adding a certain amount of alkali;

[0012] A3, stirring the solution prepared in step A2 and centrifuging, and washing the obtained filter cake to make pH=3.5-4.5;

[0013] A4, vacuum drying the washed filter cake to obtain graphene nanotubes.

[0014] The method is more conducive to obtaining graphene nanotubes.

[0015] Preferably, in step A1, the acid is concentrated sulfuric acid, and the stirring time is 45-50h, more preferably 48h;

[0016] In step A2, the added amount of KMnO4 is 4-6 times the mass of the multi-walled carbon nanotubes, more preferably 5 times the mass of the multi-walled carbon nanotubes; the alkali is hydrogen peroxide, the added amount of the hydrogen peroxide is 2.5ml / g of the multi-walled carbon nanotubes, and the hydrogen peroxide is added in a dropwise manner, more preferably the added amount of the hydrogen peroxide is 2-3ml / g of the multi-walled carbon nanotubes;

[0017] In step A3, the stirring condition is stirring at 62-68℃ for 1.5-2.5h, more preferably stirring at 65℃ for 2h;

[0018] The centrifugation is performed at a speed of 7000-9000r / min, more preferably 8000r / min;

[0019] The specific steps of the washing are at least 2 times of alternating washing with 3-8% acid solution (mass percentage) and water, more preferably the mass percentage of the acid solution is 5%;

[0020] In step A4, the vacuum drying condition is: vacuum drying at 880-920℃ for at least 2 hours under ammonia environment, more preferably vacuum drying at 900℃.

[0021] Preferably, in step A3, the pH of the washing solution is 4.0.

[0022] Preferably, the preparation method of the gold nanomaterial is: heating a tetrachloroauric acid solution at 380-420℃, then adding sodium salt and continuously stirring until the solution color starts to change, and the gold nanomaterial is obtained.

[0023] Preferably, the weight ratio of the tetrachloroauric acid to the sodium salt trisodium citrate or sodium sulfite is 1:24-26.

[0024] The sodium salt is trisodium citrate or sodium sulfite.

[0025] Preferably, the gold nanomaterial comprises gold nanoparticles.

[0026] Preferably, the water is deionized water.

[0027] The application also provides a preparation method of an electrode material for large-scale fuel cell power supply in a data center, comprising the following steps:

[0028] S1, preparation of a graphene nanotube solution: mixing graphene nanotubes with a surfactant and water, then ultrasonicating, and then centrifuging to obtain a graphene nanotube solution;

[0029] S2, preparation of an electrode material: adding gold nanomaterial to the graphene nanotube solution, then dispersing and centrifuging to obtain an electrode material solution; then coating the electrode material solution on a proton exchange membrane to obtain the electrode material.

[0030] The application can make the gold nanomaterial doped in the solution more uniformly distributed in the structure gap of the graphene nanotube by first preparing a graphene nanotube solution and then mixing the graphene nanotube solution with gold nanomaterial, thereby enhancing the uniformity, consistency and conductivity of the material and avoiding agglomeration due to improper operation.

[0031] Preferably, in step S1, the mixing ratio of the graphene nanotube to the surfactant and water is 1:8-12:1-2 (mass:volume ratio), more preferably the mixing ratio is 1:10:1.

[0032] The ultrasonicating time is 70-80 minutes, more preferably 75 minutes.

[0033] The centrifuging speed is 6500-7500r / min, and the centrifuging time is 25-40 minutes, more preferably the centrifuging speed is 7000r / min, and the centrifuging time is 30 minutes.

[0034] The surfactant is at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and polyvinyl pyrrolidone.

[0035] Preferably, the added mass fraction of the gold nanomaterial is 0-65% of the mass of the graphene nanotube, more preferably 20-62.5% of the mass of the graphene nanotube (i.e. the mass ratio of the gold nanomaterial to the graphene nanotube is 1:5-1:1.6), further preferably 40-62.5% of the mass of the graphene nanotube (i.e. the mass ratio of the gold nanomaterial to the graphene nanotube is 1:2.5-1:1.6), and most preferably 62.5% of the mass of the graphene nanotube (i.e. the mass ratio of the gold nanomaterial to the graphene nanotube is 1:1.6).

[0036] Preferably, the dispersion is performed by using an ultrasonic immersion instrument, and the processing time is 1-2 hours.

[0037] The centrifugal condition is 6000-8000r / min for 25-35min, and more preferably the centrifugal condition is 7000r / min for 30min.

[0038] The rotation speed of the coating is 2000-4000r / min, and more preferably the rotation speed is 3000r / min; and the thickness of the coating is 2-10um.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] Compared with the traditional Pt or carbon nanotube electrode, the electrode material prepared in the present application shows higher electrocatalytic performance. The cathode current of the electrode prepared in the present application is increased by up to 3.738muA, and the reduction potential is reduced by 0.507V. Among them, the performance of the membrane electrode is related to the concentration of the gold nanomaterial, and the highest power density of 62.5% Au / graphene is 242.29mW / cm -2 However, the maximum power density of the Pt / C catalyst of the traditional PEM fuel cell is only 178mW / cm -2 . BRIEF DESCRIPTION OF DRAWINGS

[0041] The detailed description of the non-limiting exemplary embodiments of the present application, together with the accompanying drawings, can better understand the present application, in which:

[0042] Figure 1 It is a working principle schematic diagram of the electrode material of the technical solution embodiment as a positive electrode;

[0043] Figure 2 It is a cyclic voltammetry curve diagram of the electrode material of the technical solution embodiments 1-4;

[0044] Figure 3A current-power density curve diagram of the electrode material of the embodiment 2-4 of the technical solution;

[0045] Figure 4 A transmission electron microscope effect diagram of the electrode material of the embodiment 2 of the technical solution;

[0046] Figure 5 A Raman spectrum combination diagram of the electrode material of the embodiment 2-4 of the technical solution. DETAILED DESCRIPTION

[0047] The application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the application. These all belong to the protection scope of the application.

[0048] As shown in Figure 1 A PEM hydrogen fuel cell model is constructed, the negative side of the membrane electrode is a Pt / C catalyst, and the positive side is the electrode material catalyst of the embodiment of the technical solution. Hydrogen loses electrons through the negative side catalyst to form hydrogen protons, among which the electrons flow to the positive side through the circuit, and the hydrogen protons reach the surface of the electrode material of the embodiment of the technical solution on the positive side through the proton exchange membrane, and continuously undergo electrochemical reactions with the electrons flowing into the positive side and the high-activity catalysis of oxygen through the gold nanoparticle and graphene nanotube composite material.

[0049] The preparation steps of the graphene nanotube solution and gold nanoparticles used in the following embodiments 1-4 are as follows:

[0050] 1) Preparation of graphene nanotube solution:

[0051] 1.1 Preparation of graphene nanotube, using high-temperature low-vacuum furnace drying method (to prevent flammable carbon in carbon nanotube structure from being damaged by high temperature):

[0052] 0.5g multi-walled carbon nanotubes were dissolved in 20ml concentrated sulfuric acid with continuous stirring for 48h pretreatment to prepare graphene nanoribbons, and then 2.5g KMnO4 was slowly added to the ongoing reaction (pH<3.0), and 5ml hydrogen peroxide was added dropwise in an ice bath. Then, the solution was stirred at 65℃ for 2 hours, and then centrifuged, and the filter cake after centrifugation at 8000r / min was washed with 5% hydrochloric acid solution and deionized water for 3 times alternately (first washed with hydrochloric acid solution, then washed with deionized water, and alternately washed in this way), so that the pH value reached 4.0. Finally, the filter cake was dried in a 900℃ vacuum furnace in an ammonia environment to obtain exfoliated graphene nanotubes.

[0053] 1.2 Preparation of graphene nanotube solution:

[0054] 30 mg of graphene nanotube obtained by exfoliation in step 1.1 and 0.3 g of sodium dodecyl sulfate were dissolved and dispersed in 30 ml of deionized water. The solution was ultrasonically treated for 75 minutes, and then centrifuged at 7000 r / min for 30 minutes to obtain a graphene nanotube solution.

[0055] 2) Preparation of gold nanoparticles:

[0056] A 20 ml, 1 mmol solution of chloroauric acid tetrahydrate was heated at 400°C, and then 2 ml, 34 mmol of trisodium citrate solution (the ratio of chloroauric acid tetrahydrate to trisodium citrate was 1:24.3) was added and stirred for 20 minutes. At this time, the solution color began to change to purple, and after cooling, it turned to wine red, and gold nanoparticles were obtained.

[0057] Example 1

[0058] The present embodiment provides a preparation method of an electrode material for large-scale fuel cell power supply in a data center, comprising the following steps:

[0059] The graphene nanotube solution prepared by the high-temperature low-vacuum drying method was placed in a beaker, 0% (mass ratio of gold nanoparticles to graphene nanotube was 0:5) of gold nanoparticles prepared by high-temperature reduction of chloroauric acid was added, and stirring and ultrasonic dispersion treatment was performed for 1 hour using an immersion ultrasonic instrument. Then, the solution was centrifuged at 7000 r / min for 30 min to obtain an electrode material solution. Finally, a rotary coater was used to deposit the prepared electrode material solution on a proton exchange membrane at 3000 r / min for 2-10 μm to obtain the electrode material. Compared with the Pt / C electrode material of the conventional PEM fuel cell, the cathode current of the electrode material prepared in the present embodiment was reduced by 4.5 μA, and the reduction potential was reduced by 0.578 V. The cyclic voltammetry curve of the electrode material prepared in the present embodiment is shown in the following figure. Figure 2 Graphene in the middle.

[0060] Example 2

[0061] The present embodiment provides a preparation method of an electrode material for large-scale fuel cell power supply in a data center, comprising the following steps:

[0062] A graphene nanotube solution prepared by high-temperature, low-vacuum furnace drying was placed in a beaker, and 20% (mass ratio of gold nanoparticles to graphene nanotubes of 1:5) of gold nanoparticles prepared by high-temperature reduction with chloroauric acid was added. The mixture was then subjected to ultrasonic dispersion and stirring for 1 hour. Afterward, the solution was centrifuged at 7000 rpm for 30 min to obtain the electrode material solution. Finally, the electrode material solution was deposited onto a proton exchange membrane at 3000 rpm using a spin coater to a thickness of 2–10 μm, yielding the electrode material. Compared to the Pt / C electrode material of traditional PEM fuel cells, the electrode material prepared in this embodiment showed a 4.504 μA reduction in cathode current and a 0.465 V reduction in reduction potential. The cyclic voltammetry and current-power density curves of the electrode material prepared in this embodiment are as follows: Figure 2 and Figure 3 The curves shown for 20% Au / graphene indicate a maximum power density of 62.01 mW / cm². -2 The transmission electron microscopy (TEM) effect of this electrode material is as follows: Figure 4 As shown, the Raman spectrum is as follows Figure 5 20% Au in NT-G is shown.

[0063] Example 3

[0064] This embodiment provides a method for preparing electrode materials for large-scale fuel cell power supply in data centers, including the following steps:

[0065] A graphene nanotube solution prepared by high-temperature, low-vacuum furnace drying was placed in a beaker, and 40% (mass ratio of gold nanoparticles to graphene nanotubes of 1:2.5) of gold nanoparticles prepared by high-temperature reduction with chloroauric acid was added. The mixture was then subjected to ultrasonic dispersion and stirring for 1 hour. Afterward, the solution was centrifuged at 7000 rpm for 30 minutes to obtain the electrode material solution. Finally, the electrode material solution was deposited onto a proton exchange membrane at 3000 rpm using a spin coater to a thickness of 2–10 μm, yielding the electrode material. Compared to the Pt / C electrode material of traditional PEM fuel cells, the electrode material prepared in this embodiment showed an increase in cathode current of 1.446 μA and a decrease in reduction potential of 0.449 V. The cyclic voltammetry and current-power density curves of the electrode material prepared in this embodiment are as follows: Figure 2 and Figure 3 The curve shown for 40% Au / graphene indicates a maximum power density of 136.25 mW / cm². -2 The Raman spectrum of this electrode material is as follows: Figure 5 The figure shows 40% Au in NT-G.

[0066] Example 4

[0067] The embodiment provides a preparation method of an electrode material for large-scale fuel cell power supply of a data center, and comprises the following steps:

[0068] The graphene nanotube solution prepared by the high-temperature low-vacuum furnace drying method is put into a beaker, 62.5% (the mass ratio of gold nanoparticles to graphene nanotube is 1:1.6) gold nanoparticles prepared by high-temperature reduction of chloroauric acid are added, and stirring and ultrasonic dispersion treatment are performed for 1 hour by using an immersion ultrasonic instrument. Then, the solution is centrifuged at 7000 r / min for 30 min to obtain an electrode material solution. Finally, the prepared electrode material solution is deposited on a proton exchange membrane at 2-10 μm by using a spin coater at 3000 r / min, and the electrode material is obtained. Compared with a Pt / C electrode material (the maximum power density is 178 mW / cm -2 ) of a traditional PEM fuel cell, the cathode current of the electrode material prepared by the embodiment is increased by 3.738 μA, and the reduction potential is reduced by 0.507 V. The cyclic voltammetry curve and the current-power density curve of the electrode material prepared by the embodiment are shown in the curves of 62.5% Au / graphene in Figure 2 and Figure 3 The highest power density of the 62.5% Au / graphene reaches 242.29 mW / cm -2 . The Raman spectrum of the electrode material is shown in 62.5% Au in NT-G in Figure 5 .

[0069] Embodiment 5

[0070] The embodiment provides a preparation method of an electrode material for large-scale fuel cell power supply of a data center, and comprises the following steps:

[0071] 1) Preparation of a graphene nanotube solution:

[0072] 1.1 Preparation of graphene nanotubes by using a high-temperature low-vacuum furnace drying method (to prevent flammable carbon in the carbon nanotube structure from being damaged by high temperature):

[0073] 0.5 g of multi-walled carbon nanotubes is dissolved in 20 ml of concentrated sulfuric acid for continuous stirring for 50 h for pretreatment, graphene nanobands are prepared, 2.0 g of KMnO4 is slowly added to the reaction in progress (pH<3.0), and 4 ml of hydrogen peroxide is added dropwise in an ice bath. Then, the solution is stirred at 68℃ for 1.5 hours, and then centrifuged, the filter cake after centrifugation at 9000 r / min is washed with 8% hydrochloric acid solution and deionized water for four times alternately (first washed with the hydrochloric acid solution, and then washed with the deionized water, and the alternation is repeated), so that the pH value reaches 3.5. Finally, the filter cake is dried in an ammonia gas environment of a 880℃ vacuum furnace for at least 2 hours to obtain the exfoliated graphene nanotubes.

[0074] 1.2 Preparation of graphene nanotube solution:

[0075] 30 mg of graphene nanotube obtained by the exfoliation treatment in step 1.1 and 0.24 g of sodium dodecyl sulfate were dissolved and dispersed in 45 ml of deionized water, and a graphene nanotube solution was prepared by centrifuging the solution at 6,500 r / min for 40 min after ultrasonic treatment for 70 min.

[0076] 2) Preparation of gold nanoparticles:

[0077] A 20 ml, 1 mmol solution of chloroauric acid tetrahydrate was heated at 420°C, and then 2 ml, 34 mmol of a trisodium citrate solution (weight ratio of chloroauric acid tetrahydrate to trisodium citrate: 1:24.3) was added and stirred until the solution color began to change to purple, and after cooling, it turned to wine red, and gold nanoparticles were obtained.

[0078] 3) Preparation of electrode material:

[0079] The graphene nanotube solution prepared in step 1) was placed in a beaker, 40% (mass ratio of gold nanoparticles to graphene nanotubes: 1:2.5) of gold nanoparticles prepared in step 2) were added, and stirring and ultrasonic dispersion treatment were performed for 2 hours using an immersion ultrasonic instrument, and then the solution was centrifuged at 6,000 r / min for 35 min to obtain an electrode material solution. Finally, the electrode material solution prepared was deposited on a proton exchange membrane at 2-10 μm using a spin coater at 4,000 r / min, and an electrode material was obtained. Compared with the Pt / C electrode material of the conventional PEM fuel cell, the cathode current of the electrode material prepared in the present application was increased by 1.235 μA, and the reduction potential was reduced by 0.422 V. The highest power density was 118.36 mW / cm -2 .

[0080] Example 6

[0081] The present embodiment provides a preparation method of an electrode material for large-scale fuel cell power supply in a data center, comprising the following steps:

[0082] 1) Preparation of graphene nanotube solution:

[0083] 1.1 Preparation of graphene nanotubes using a high-temperature low-vacuum furnace drying method (to prevent flammable carbon in the carbon nanotube structure from being damaged by high temperature):

[0084] The 0.5 g multi-walled carbon nanotubes were dissolved in 20 ml of concentrated sulfuric acid under continuous stirring for 45 h for pretreatment, to prepare graphene nanoribbons, and then 3.0 g of KMnO4 was slowly added to the ongoing reaction (pH < 3.0), and 6 ml of hydrogen peroxide was added dropwise in an ice bath. Then, the solution was stirred at 62℃ for 2.5 hours, after which it was centrifuged, and the filter cake after centrifugation at 7000 r / min was washed with 3% hydrochloric acid solution and deionized water for 4 times alternately (first washed with hydrochloric acid solution, and then washed with deionized water, alternately), so that the pH value reached 4.5. Finally, the filter cake was dried in an ammonia environment in a vacuum furnace at 920℃ for more than 2 hours to obtain exfoliated graphene nanotubes.

[0085] 1.2 Preparation of graphene nanotube solution:

[0086] The 30 mg of graphene nanotubes exfoliated in step 1.1 and 0.36 g of sodium dodecyl sulfate were dissolved and dispersed in 60 ml of deionized water, and the solution was ultrasonically treated for 80 minutes, and then centrifuged at a speed of 7500 r / min per minute for 25 minutes to obtain a graphene nanotube solution.

[0087] 2) Preparation of gold nanoparticles:

[0088] 20 ml of 1 mmol of chloroauric acid tetrahydrate solution was heated at 380℃, and then 2 ml of 34 mmol of sodium sulfite solution (the weight ratio of chloroauric acid tetrahydrate to sodium sulfite was 1:24.3) was added and stirred until the solution color began to change to purple, and after cooling, it turned to wine red, to obtain gold nanoparticles.

[0089] 3) Preparation of electrode material:

[0090] The graphene nanotube solution prepared in step 1) was placed in a beaker, 40% (the mass ratio of gold nanoparticles to graphene nanotubes was 1:2.5) of gold nanoparticles prepared in step 2) was added, and stirring and ultrasonic dispersion treatment was performed for 1 hour using an immersion ultrasonic instrument, and then the solution was centrifuged at 8000 r / min for 25 min to obtain an electrode material solution. Finally, the prepared electrode material solution was deposited on a proton exchange membrane at 2000 r / min for 2-10 μm using a spin coater, to obtain an electrode material. Compared with the traditional Pt / C electrode material of PEM fuel cell, the cathode current of the electrode material prepared in the application was increased by 1.683 μA, and the reduction potential was reduced by 0.461 V. The highest power density was 152.27 mW / cm -2 .

[0091] Comparative Example 1

[0092] The method of the present comparative example is basically the same as that of Example 3, except that carbon nanotubes are used instead of graphene nanotubes.

[0093] Compared with the Pt / C electrode material of the conventional PEM fuel cell, the cathode current of the electrode material (40% Au / C) prepared in the present comparative example is increased by 1.085 μA, and the reduction potential is decreased by 0.446 V. The maximum power density is 112.64 mW / cm -2 .

[0094] The present application has many specific application approaches, and the above description is only the preferred embodiment of the present application. It should be pointed out that the above examples are only used to illustrate the present application, and are not used to limit the protection scope of the present application. For ordinary skilled persons in the art, several improvements can be made without departing from the principles of the present application, and these improvements should also be considered as the protection scope of the present application.

Claims

1. An electrode material for large scale fuel cell powered data centers, characterized by, The electrode material is a composite of gold nanomaterial and graphene nanotube; the added mass fraction of the gold nanomaterial is 40-62.5% of the mass of the graphene nanotube; The preparation method of the graphene nanotube is as follows: A1, dissolving multi-walled carbon nanotubes in concentrated sulfuric acid and stirring for 45-50 hours to prepare graphene nanobelt; A2, adding KMnO4 to the graphene nanobelt, the added amount of KMnO4 being 4-6 times the mass of the multi-walled carbon nanotube, and maintaining pH<3.0, then adding hydrogen peroxide dropwise, the added amount of hydrogen peroxide being 2-3 ml / g of the multi-walled carbon nanotube; A3, after stirring the solution prepared in step A2 at 62-68℃ for 1.5-2.5 hours, centrifuging at 7000-9000 r / min, and washing the obtained filter cake with an acid solution with a mass percentage of 3-8% and water at least twice alternately to make pH=3.5-4.5; A4, vacuum drying the washed filter cake in an ammonia environment at 880-920℃ for at least 2 hours to obtain graphene nanotube.

2. The electrode material for large scale fuel cell power supply for data centers of claim 1, wherein, The preparation method of the gold nanomaterial is: heating a chloroauric acid tetrahydrate solution at 380-420℃, then adding sodium salt and continuously stirring until the solution color begins to change, to obtain the gold nanomaterial.

3. The electrode material for large scale fuel cell power supply for data centers of claim 2, wherein, The weight ratio of the chloroauric acid tetrahydrate to the sodium salt is 1:24-26; The sodium salt is trisodium citrate or sodium sulfite.

4. A method for preparing an electrode material for large-scale fuel cell power supply for data centers according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: S1, preparation of graphene nanotube solution: mixing graphene nanotube, surfactant and water, then ultrasonic, and then centrifuging to obtain graphene nanotube solution; S2, preparation of electrode material: adding gold nanomaterial to the graphene nanotube solution, then dispersing and centrifuging to obtain electrode material solution; then coating the electrode material solution on a proton exchange membrane to obtain the electrode material.

5. The method for preparing electrode materials for large-scale fuel cell power supply in data centers according to claim 4, characterized in that, In step S1, the mixing ratio of graphene nanotube, surfactant and water is 1mg:(8-12)mg:(1-2)mL; The ultrasonic time is 70-80 minutes; the centrifuging speed is 6500-7500 r / min, and the centrifuging time is 25-40 minutes; The surfactant is at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and polyvinyl pyrrolidone.

6. The method for preparing electrode materials for large-scale fuel cell power supply in data centers according to claim 4, characterized in that, In step S2, the dispersion is carried out by using an immersion ultrasonic instrument, and the processing time is 1-2 hours; The centrifuging condition is 6000-8000 r / min for 25-35 min.

7. The method for preparing electrode materials for large-scale fuel cell power supply in data centers according to claim 4, characterized in that, In step S2, the coating speed is 2000-4000 r / min, and the coating thickness is 2-10 μm.

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