CN115369279B - Nano-porous PdIr double-noble-metal three-functional material, and preparation method and application thereof - Google Patents
Nano-porous PdIr double-noble-metal three-functional material, and preparation method and application thereof Download PDFInfo
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- C22C5/00—Alloys based on noble metals
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- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C3/00—Removing material from alloys to produce alloys of different constitution separation of the constituents of alloys
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- H01M4/00—Electrodes
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Abstract
The invention belongs to the technical field of nano porous materials, and particularly relates to a nano porous PdIr double-noble metal three-functional material, and a preparation method and application thereof. The nano porous double noble metal three-function electrocatalytic material comprises Pd element and Ir element, improves the catalytic efficiency by adjusting the combination of noble metals, relieves the problem of rare content of noble metals in nature, improves the stability of the electrocatalytic agent, has better ORR, OER and HER catalytic activities, can be used in fuel cells, electrolyzed water and other technologies, and has good catalytic activity. The preparation method combines alloy design and dealloying method, and converts bulk alloy into nano porous double noble metal three-function electrocatalytic material with high specific surface area. The method is simple and can effectively prepare the double-noble metal three-function electrocatalytic material, and the prepared material has a nano porous structure, small pores, simple operation, safety and environmental protection, and the active area of the catalyst is increased.
Description
Technical Field
The invention belongs to the technical field of nano porous materials, and particularly relates to a nano porous PdIr double-noble metal three-functional material, and a preparation method and application thereof.
Background
The energy technologies such as fuel cells, metal-air cells, electrolyzed water and the like have attracted wide attention because of the advantages of high-efficiency energy conversion, environmental friendliness and the like, oxygen Reduction Reaction (ORR), oxygen Evolution Reaction (OER) and Hydrogen Evolution Reaction (HER) are key electrode reaction processes generated in the energy technologies, but the three reaction processes all have the problem of slow dynamics because of the multi-stage electron transfer and proton coupling processes, the catalysts for the ORR and the HER are mainly Pt and alloys thereof, and the catalysts for the OER reaction are mainly IrO 2 And RuO (Ruo) 2 However, its stability is poor, so new electrocatalysts are developed or by conditioning the noble metalsThe combination of the two to improve the electrocatalytic efficiency plays a vital role in the fields of new energy storage and conversion.
Currently, there have been some studies on noble metal alloy catalysts. As disclosed in the prior art, a noble metal catalyst for catalytic oxidation of CO is prepared by one-step mechanical ball milling method on anatase TiO 2 One or more of noble metal Pt, ag, pd, rh, ir, ru, os or Au is/are loaded on the surface, and one or more of auxiliary Co, cr, zr, sn, mo, W, fe, ce, ni, nb and the like is/are added to obtain the noble metal catalyst. The catalyst can realize complete CO conversion at about 140 ℃, and has SO at about 180 DEG C 2 And H 2 Under the condition of O existence, the catalyst has better sulfur-resistant and water-resistant effects, and the catalytic effect can be maintained to be more than 95% after continuous test for about 60 hours. The prior art also discloses a supported bimetallic catalyst which is a bimetallic single-atom catalyst rich in unsaturated coordination alumina, wherein one metal is noble metals such as Ru, rh, pd and the like, and the other metal is non-noble metals such as Fe, bi, cu, co and the like. The catalyst is suitable for selective hydrogenation reaction, shows excellent hydrogenation activity and selectivity, and the preparation method is simple to operate and easy to realize. However, pdIr double noble metals with nano-porous morphology, and preparation methods and electrocatalytic applications thereof have not been reported yet.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a nano porous PdIr double noble metal three-functional material, a preparation method and application thereof, and the PdIr double noble metal electrocatalytic material has excellent ORR, OER and HER electrocatalytic activity, is a three-functional electrocatalytic agent and has better stability.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a dual-noble metal three-function electrocatalytic material, wherein the dual-noble metal material is a PdIr alloy; the micro-morphology of the porous ceramic material is a nano porous structure, and the pore diameter of the nano porous ceramic material is 1-100nm.
The invention also provides a preparation method of the nano porous double noble metal material. The preparation method realizes the conversion of the block alloy into the nano porous double noble metal material with high specific surface area, is simple, has easy realization of conditions, can be produced in large scale and has good application prospect.
The preparation method is characterized by combining an alloy design and a dealloying method to convert a bulk alloy into a nano-porous double-noble metal material with a high specific surface area.
The preparation method of the double-noble metal three-function electrocatalytic material comprises the following steps:
(1) In the aspect of alloy design, selecting original metal with purity more than 99.9%, and proportioning according to each atomic ratio; placing the prepared raw materials into a vacuum arc furnace for smelting to obtain uniform alloy ingots; and then preparing the alloy ingot into an alloy strip in a vacuum melt-spinning machine.
(2) In the dealloying aspect, the alloy strip in the step (1) is placed into a corrosion solution with a certain concentration for chemical dealloying, corrosion products and impurities are removed by cleaning, and the cleaned sample is dried in vacuum at a certain temperature.
According to the present invention, preferably, the original metal in the step (1) is Al element, pd element, ir element.
According to the present invention, preferably, the atomic percentage in the step (1) is Al: 96%, pd element: 1%, ir element: 3%; or Al element: 96%, pd element: 3%, ir element: 1%.
According to the present invention, preferably, the etching solution in the step (2) is a NaOH solution.
According to the present invention, it is preferable that the etching solution concentration in the step (2) is 5M.
According to the present invention, it is preferable that the vacuum drying temperature in the step (2) is 60 ℃.
In an alternative embodiment, the operation steps of smelting raw materials in a vacuum arc furnace to obtain uniform alloy ingots specifically comprise:
placing the prepared raw materials into a smelting pit of a vacuum arc furnace;
vacuumizing and filling high-purity argon;
repeatedly smelting for many times under the protection of high-purity argon to obtain alloy ingots.
In an alternative embodiment, the operation steps of vacuumizing and filling high-purity argon gas specifically include:
the vacuum degree of the cavity of the equipment reaches 3 multiplied by 10 through rough pumping of a mechanical pump and fine pumping of a molecular pump -3 After Pa, filling high-purity argon; vacuumizing again to 3×10 -3 And after Pa, high-purity argon is filled again.
In an alternative embodiment, in the step of repeatedly smelting under the protection of high-purity argon gas for a plurality of times to obtain alloy ingots:
the smelting times are 4-7 times.
In an alternative embodiment, the operation steps of preparing the alloy strip from the alloy ingot in the vacuum melt-spinning machine specifically comprise:
crushing an alloy cast ingot, and placing a part of the crushed alloy cast ingot as a master alloy into a quartz tube of a vacuum melt-spinning machine;
adjusting the vacuum degree of the furnace chamber of the vacuum belt-throwing machine to 2 multiplied by 10 -3 After Pa, starting a stepless speed regulating motor, and switching on an induction coil power supply after the rotating speed of the copper roller reaches a preset rotating speed, so that master alloy in the quartz tube is completely melted to obtain alloy melt;
and (3) high-purity argon is instantaneously filled into the quartz tube, so that a preset pressure difference is formed between the interior of the quartz tube and a furnace chamber of the vacuum melt-spinning machine, alloy melt is driven to be sprayed to the surface of the copper roller from a nozzle of the quartz tube under the action of the preset pressure difference, and the alloy strip is formed by rapid cooling.
In an alternative embodiment, the preset rotational speed of the copper roller is 2000-3500 rpm;
the preset pressure difference formed between the quartz tube and the furnace chamber is 0.03-0.05 MPa.
In an alternative embodiment, the steps of placing the alloy strip in a 5M NaOH solution to remove Al and cleaning to remove impurities specifically include:
the alloy strip was placed in a 150mL beaker, then poured into a 5M NaOH solution, left for a period of time until no bubbles appeared in the beaker, the supernatant was decanted and washed 5-6 times with water and ethanol, respectively, to remove impurities.
In an alternative embodiment, the operation steps of vacuum drying the cleaned and dried sample at 60 ℃ to obtain the nano porous double noble metal three-function electrocatalytic material specifically include:
and (3) placing the cleaned and dried sample into a vacuum drying oven, setting the temperature to be 60 ℃, pumping air in the vacuum drying oven by using a vacuum pump, and drying for 11-12 hours to obtain the nano porous double-noble metal three-function electrocatalytic material.
The invention also provides application of the nano porous double noble metal material, which is used as an electrocatalytic material.
Advantageous effects
The invention relates to a nano porous double noble metal three-function electrocatalytic material, which comprises the following elements: pd element and Ir element. The PdIr electrocatalyst provided by the invention improves the catalytic efficiency by adjusting the combination of noble metals, relieves the problem that the noble metals are rare in the nature, and improves the stability of the electrocatalyst. The electrocatalyst provided by the invention has better catalytic activities of ORR (oxygen reduction reaction), OER (oxygen evolution reaction) and HER (hydrogen evolution reaction), can be used in fuel cells, electrolyzed water and other technologies, and has good catalytic activity.
The preparation method combines alloy design and dealloying methods, and converts bulk alloy into the nano porous double noble metal three-function electrocatalytic material with high specific surface area. The preparation method comprises the steps of obtaining alloy ingots with uniform components by adopting a non-consumable vacuum arc furnace, obtaining alloy strips after vacuum melt-spinning, and removing Al element by adopting a dealloying technology to prepare the double-noble metal three-function electrocatalytic material. The method is simple and can effectively prepare the double-noble metal three-function electrocatalytic material, and the prepared double-noble metal material has a nano porous structure and smaller pores, so that the active area of the catalyst is increased. The preparation method provided by the invention is simple and convenient to operate, safe and environment-friendly.
Description of the drawings:
FIG. 1 shows a double noble metal Pd prepared in examples 1 and 2 of the present invention 1 Ir 3 And Pd (Pd) 3 Ir 1 X-ray diffraction spectrum pattern of (c).
FIG. 2 shows a double noble metal Pd prepared in example 1 of the present invention 1 Ir 3 Scanning electron microscope photograph a of (2).
FIG. 3 shows a double noble metal Pd prepared in example 1 of the present invention 1 Ir 3 Scanning electron microscope photograph b of (c).
FIG. 4 shows a double noble metal Pd prepared in example 2 of the present invention 3 Ir 1 Scanning electron microscope photograph a of (2).
FIG. 5 shows a double noble metal Pd prepared in example 2 of the present invention 3 Ir 1 Scanning electron microscope photograph b of (c).
FIG. 6 shows the double noble metal Pd prepared in examples 1 and 2 of the present invention 1 Ir 3 And Pd (Pd) 3 Ir 1 At O 2 ORR polarization curve for a scan rate of 10mV/s in saturated 0.1M KOH solution.
FIG. 7 shows the double noble metal Pd prepared in examples 1 and 2 of the present invention 1 Ir 3 And Pd (Pd) 3 Ir 1 At O 2 OER polarization curve at a scan rate of 10mV/s in saturated 1M KOH solution.
FIG. 8 shows the double noble metal Pd prepared in examples 1 and 2 of the present invention 1 Ir 3 And Pd (Pd) 3 Ir 1 At O 2 HER polarization profile at a scan rate of 10mV/s in saturated 1M KOH solution.
Detailed Description
Hereinafter, the present invention will be described in detail. Before the description, it is to be understood that the terms used in this specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description set forth herein is merely a preferred example for the purpose of illustration and is not intended to limit the scope of the invention, so that it should be understood that other equivalents or modifications may be made thereto without departing from the spirit and scope of the invention.
The following examples are merely illustrative of embodiments of the present invention and are not intended to limit the invention in any way, and those skilled in the art will appreciate that modifications may be made without departing from the spirit and scope of the invention. Unless otherwise specified, reagents and equipment used in the following examples are commercially available products.
Description of the terminology:
unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
The embodiment provides a dual-noble metal three-function electrocatalytic material Pd 1 Ir 3 The preparation method comprises the following steps:
(1) The original metals Al, pd and Ir with purity more than 99.9 percent are prepared according to the atomic percentage of 96:1:3, proportioning;
(2) Smelting the high-purity metal in a vacuum arc furnace;
wherein, step (2) specifically includes:
placing the prepared raw materials into a smelting pit of a vacuum arc furnace;
the vacuum degree of the cavity of the equipment reaches 3 multiplied by 10 through rough pumping of a mechanical pump and fine pumping of a molecular pump -3 After Pa, filling high-purity argon; then, the vacuum is again pumped to 3X 10 -3 After Pa, high-purity argon is filled again;
and repeatedly smelting the alloy ingot for 4-7 times under the protection of high-purity argon, so as to obtain the alloy ingot with uniform components.
(3) Carrying out melt-spinning on the alloy cast ingot in a vacuum melt-spinning machine to obtain an alloy strip;
wherein, step (3) specifically includes:
crushing the alloy ingot, and placing a part of the crushed alloy ingot as a master alloy in a quartz tube (nozzle cross section 0.2X3 mm) 2 ) In (a) and (b);
when the vacuum degree of the vacuum belt-throwing machine furnace chamber reaches 2 multiplied by 10 -3 After Pa, starting a stepless speed regulating motor, and switching on an induction coil power supply after the rotating speed of the copper roller reaches 3500rpm (the surface linear speed is about 35 m/s) so as to completely melt a master alloy rod in the quartz tube;
and then high-purity argon is instantaneously filled into the quartz tube, a pressure difference (0.05 MPa) is established between the inside of the quartz tube and the furnace chamber, alloy melt is driven to be directly sprayed onto a copper roller rotating at a high speed, and the copper roller is rapidly cooled to form a strip.
(4) Dealloying the alloy strip to obtain the nano porous double noble metal material Pd 1 Ir 3 。
Wherein, the step (4) specifically comprises:
the alloy strip was placed in a 150mL beaker, then poured into a sufficient amount of 5M NaOH solution, allowed to stand at room temperature for a period of time, and when no bubbles were present in the beaker, the supernatant was poured out and washed with water and absolute ethanol 5-6 times, respectively, to remove impurities.
And (3) placing the cleaned alloy into a vacuum drying oven, setting the temperature to be 60 ℃, pumping air in the vacuum drying oven by using a vacuum pump, and drying for 11-12 hours to obtain the nano porous double-noble metal three-function electrocatalytic material.
The phase structure of the dealloying strip structure of the embodiment is shown in FIG. 1, from which Pd can be seen 1 Ir 3 The catalyst contains Pd and Ir phases. The dual-noble metal three-function electrocatalytic material Pd prepared by the embodiment 1 Ir 3 Is shown in fig. 2-3. As can be seen from fig. 2 to 3, the prepared sample has a nano-porous structure, and the pore diameter of the nano-porous structure is 1-100nm. The dual-noble metal three-function electrocatalytic material Pd prepared by the embodiment 1 Ir 3 The electrocatalytic performance of the catalyst is shown in figures 6, 7 and 8, and the double noble metal three-function electrocatalytic material Pd prepared by the example can be seen from figures 6, 7 and 8 1 Ir 3 Has excellent ORR, OER and HER performances.
Example 2
The embodiment provides a dual-noble metal three-function electrocatalytic material Pd 3 Ir 1 The preparation method comprises the following steps:
(1) The original metals Al, pd and Ir with purity more than 99.9 percent are prepared according to the atomic percentage of 96: 3:1, batching;
(2) Smelting the high-purity metal in a vacuum arc furnace;
wherein, step (2) specifically includes:
placing the prepared raw materials into a smelting pit of a vacuum arc furnace;
the vacuum degree of the cavity of the equipment reaches 3 multiplied by 10 through rough pumping of a mechanical pump and fine pumping of a molecular pump -3 After Pa, filling high-purity argon; then, the vacuum is again pumped to 3X 10 -3 After Pa, high-purity argon is filled again;
and repeatedly smelting the alloy ingot for 4-7 times under the protection of high-purity argon, so as to obtain the alloy ingot with uniform components.
(3) Carrying out melt-spinning on the alloy cast ingot in a vacuum melt-spinning machine to obtain an alloy strip;
wherein, step (3) specifically includes:
crushing the alloy ingot, and placing a part of the crushed alloy ingot as a master alloy in a quartz tube (nozzle cross section 0.2X3 mm) 2 ) In (a) and (b);
when the vacuum degree of the vacuum belt-throwing machine furnace chamber reaches 2 multiplied by 10 -3 After Pa, starting a stepless speed regulating motor, and switching on an induction coil power supply after the rotating speed of the copper roller reaches 3500rpm (the surface linear speed is about 35 m/s) so as to completely melt a master alloy rod in the quartz tube;
and then high-purity argon is instantaneously filled into the quartz tube, a pressure difference (0.05 MPa) is established between the inside of the quartz tube and the furnace chamber, alloy melt is driven to be directly sprayed onto a copper roller rotating at a high speed, and the copper roller is rapidly cooled to form a strip.
(4) Dealloying the alloy strip to obtain the nano porous double noble metal material Pd 3 Ir 1 。
Wherein, the step (4) specifically comprises:
the alloy strip was placed in a 150mL beaker, then poured into a sufficient amount of 5M NaOH solution, allowed to stand at room temperature for a period of time, and when no bubbles were present in the beaker, the supernatant was poured out and washed with water and absolute ethanol 5-6 times, respectively, to remove impurities.
And (3) placing the cleaned alloy into a vacuum drying oven, setting the temperature to be 60 ℃, pumping air in the vacuum drying oven by using a vacuum pump, and drying for 11-12 hours to obtain the nano porous double-noble metal three-function electrocatalytic material.
The phase structure of the dealloying strip structure of the embodiment is shown in FIG. 1, from which Pd can be seen 3 Ir 1 The catalyst contains Pd and Ir phases. The dual-noble metal three-function electrocatalytic material Pd prepared by the embodiment 3 Ir 1 Is shown in fig. 4-5. As can be seen from fig. 4 to 5, the prepared sample has a nano-porous structure, and the pore diameter of the nano-porous structure is 1-100nm. The dual-noble metal three-function electrocatalytic material Pd prepared by the embodiment 3 Ir 1 The electrocatalytic performance of the catalyst is shown in figures 6, 7 and 8, and the double noble metal three-function electrocatalytic material Pd prepared by the example can be seen from figures 6, 7 and 8 3 Ir 1 Has excellent ORR, OER and HER performances.
Application example 1
The ORR performance test method comprises the following steps: the three-electrode system is adopted, a glassy carbon electrode coated by a sample is used as a working electrode, a platinum wire is used as a counter electrode, an Hg/HgO electrode is used as a reference electrode, and the electrolyte is as follows: 0.1M KOH solution. Oxygen is introduced before the test to saturate the oxygen in the electrolyte. The scan rate was 10mV/s.
FIG. 6 shows a double noble metal three-function electrocatalytic material Pd prepared in examples 1 and 2 1 Ir 3 And Pd (Pd) 3 Ir 1 At O 2 ORR polarization curve for a scan rate of 10mV/s in saturated 0.1M KOH solution.
As can be seen from FIG. 6, the dual noble metal three-function electrocatalytic material Pd prepared in example 2 3 Ir 1 Compared with the dual noble metal prepared in the example 1, the three-functional electrocatalytic catalystMaterial Pd 1 Ir 3 Has better ORR catalytic performance.
Application example 2
The OER performance test method comprises the following steps: the three-electrode system is adopted, a glassy carbon electrode coated by a sample is used as a working electrode, a platinum wire is used as a counter electrode, an Hg/HgO electrode is used as a reference electrode, and the electrolyte is as follows: 1M KOH solution. Oxygen is introduced before the test to saturate the oxygen in the electrolyte. The scan rate was 10mV/s.
FIG. 7 shows a double noble metal three-function electrocatalytic material Pd prepared in examples 1 and 2 1 Ir 3 And Pd (Pd) 3 Ir 1 At O 2 OER polarization curve at a scan rate of 10mV/s in saturated 1M KOH solution.
As can be seen from FIG. 7, the dual noble metal three-function electrocatalytic material Pd prepared in example 1 1 Ir 3 Compared with the double noble metal three-function electrocatalytic material Pd prepared in example 2 3 Ir 1 Has better OER catalytic performance.
Application example 3
The performance test method of HER comprises the following steps: the three-electrode system is adopted, a glassy carbon electrode coated by a sample is used as a working electrode, a graphite rod is used as a counter electrode, an Hg/HgO electrode is used as a reference electrode, and the electrolyte is as follows: 1M KOH solution. Nitrogen is introduced before the test to saturate the electrolyte with nitrogen. The scan rate was 10mV/s.
FIG. 8 shows a double noble metal three-function electrocatalytic material Pd prepared in examples 1 and 2 1 Ir 3 And Pd (Pd) 3 Ir 1 At N 2 HER polarization profile at a scan rate of 10mV/s in saturated 1M KOH solution.
As can be seen from FIG. 8, the dual noble metal three-function electrocatalytic material Pd prepared in example 2 3 Ir 1 Compared with the double noble metal three-function electrocatalytic material Pd prepared in example 1 1 Ir 3 Has better HER response performance.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (4)
1. The nano porous PdIr double-precious metal three-functional material is characterized in that the material is a PdIr alloy; the micro-morphology of the porous ceramic material is a nano porous structure, and the pore diameter of the nano porous ceramic material is 1-100nm; the material has excellent ORR, OER and HER electrocatalytic activity;
the preparation method of the material comprises the following steps:
(1) Alloy design: selecting original metal, and proportioning according to each atomic ratio; smelting the prepared raw materials to obtain uniform alloy ingots; then processing the alloy cast ingot to prepare an alloy strip;
(2) Dealloying: placing the alloy strip obtained in the step (1) into a corrosion solution with a certain concentration, performing chemical dealloying, cleaning to remove corrosion products and impurities, and vacuum drying a cleaned sample at a certain temperature to obtain the nano-porous PdIr double-noble metal three-functional material;
the purity of the original metal selected in the step (1) is more than 99.9%, wherein the original metal is Al element, pd element and Ir element; the atomic percentages are as follows: 96% of Al element, 1% of Pd element and 3% of Ir element; or 96% of Al element, 3% of Pd element and 1% of Ir element;
in the step (2), the corrosion solution is NaOH solution, the concentration of the corrosion solution is 5M, and the vacuum drying temperature is 60 ℃;
the dealloying operation step in the step (2) specifically comprises:
placing the alloy strip into a container, then pouring 5M NaOH solution, standing for a period of time until no bubbles appear in the container, pouring out supernatant, and respectively cleaning the alloy strip with water and ethanol for 5-6 times to remove impurities;
and (3) placing the cleaned and dried sample into a vacuum drying oven, setting the temperature to be 60 ℃, pumping air in the vacuum drying oven by using a vacuum pump, and drying for 11-12 hours to obtain the nano porous double-noble metal three-function electrocatalytic material.
2. The nano-porous PdIr double noble metal tri-functional material according to claim 1, wherein in step (1), the operation step of smelting specifically includes:
placing the prepared raw materials into a smelting pit of a vacuum arc furnace;
vacuumizing and filling high-purity argon gas: the vacuum degree of the cavity of the equipment reaches 3 multiplied by 10 through rough pumping of a mechanical pump and fine pumping of a molecular pump -3 After Pa, filling high-purity argon; vacuumizing again to 3×10 -3 After Pa, high-purity argon is filled again;
repeatedly smelting for multiple times under the protection of high-purity argon to obtain alloy ingots, wherein the smelting times are 4-7 times.
3. The three-functional nano-porous PdIr double-noble metal material according to claim 1, wherein in the step (1), the operation step of processing the alloy ingot to prepare the alloy strip specifically includes:
crushing an alloy cast ingot, and placing a part of the crushed alloy cast ingot as a master alloy into a quartz tube of a vacuum melt-spinning machine;
adjusting the vacuum degree of the furnace chamber of the vacuum belt-throwing machine to 2 multiplied by 10 -3 After Pa, starting a stepless speed regulating motor, and switching on an induction coil power supply after the rotating speed of the copper roller reaches a preset rotating speed, so that master alloy in the quartz tube is completely melted to obtain alloy melt; the preset pressure difference formed between the quartz tube and the furnace chamber is 0.03-0.05 MPa;
and (3) instantly filling high-purity argon into the quartz tube, so that a preset pressure difference is formed between the inside of the quartz tube and a furnace chamber of the vacuum belt-spinning machine, alloy melt is driven to be sprayed to the surface of a copper roller from a nozzle of the quartz tube under the action of the preset pressure difference, and the copper roller is rapidly cooled to form an alloy strip, wherein the preset rotating speed of the copper roller is 2000-3500 rpm.
4. Use of a nanoporous PdIr double noble metal trifunctional material according to any one of claims 1 to 3, characterized in that it is used as electrocatalytic material.
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Inventor after: Zhang Wenchao Inventor after: Si Conghui Inventor after: Wang Qilu Inventor after: Sang Xinyi Inventor before: Si Conghui Inventor before: Zhang Wenchao Inventor before: Wang Qilu Inventor before: Sang Xinyi |