CN115557469A - Amorphous noble metal oxide material and preparation method and application thereof - Google Patents
Amorphous noble metal oxide material and preparation method and application thereof Download PDFInfo
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- CN115557469A CN115557469A CN202211136620.9A CN202211136620A CN115557469A CN 115557469 A CN115557469 A CN 115557469A CN 202211136620 A CN202211136620 A CN 202211136620A CN 115557469 A CN115557469 A CN 115557469A
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- 238000000034 method Methods 0.000 claims abstract description 32
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- CDVAIHNNWWJFJW-UHFFFAOYSA-N 3,5-diethoxycarbonyl-1,4-dihydrocollidine Chemical compound CCOC(=O)C1=C(C)NC(C)=C(C(=O)OCC)C1C CDVAIHNNWWJFJW-UHFFFAOYSA-N 0.000 description 3
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- 238000002441 X-ray diffraction Methods 0.000 description 3
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- HKLLPUXIXYSKMS-UHFFFAOYSA-N cerium(3+) iridium(3+) oxygen(2-) Chemical compound [O-2].[Ce+3].[Ir+3].[O-2].[O-2] HKLLPUXIXYSKMS-UHFFFAOYSA-N 0.000 description 2
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- PIOYDHPEUPDGHD-UHFFFAOYSA-N [Fe].[Ir] Chemical compound [Fe].[Ir] PIOYDHPEUPDGHD-UHFFFAOYSA-N 0.000 description 1
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- LZKLAOYSENRNKR-LNTINUHCSA-N iron;(z)-4-oxoniumylidenepent-2-en-2-olate Chemical compound [Fe].C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O LZKLAOYSENRNKR-LNTINUHCSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/14—Methods for preparing oxides or hydroxides in general
- C01B13/32—Methods for preparing oxides or hydroxides in general by oxidation or hydrolysis of elements or compounds in the liquid or solid state or in non-aqueous solution, e.g. sol-gel process
- C01B13/326—Methods for preparing oxides or hydroxides in general by oxidation or hydrolysis of elements or compounds in the liquid or solid state or in non-aqueous solution, e.g. sol-gel process of elements or compounds in the liquid state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G55/00—Compounds of ruthenium, rhodium, palladium, osmium, iridium, or platinum
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
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- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/075—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound
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- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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Abstract
The invention relates to an amorphous noble metal oxide material and a preparation method and application thereof. Compared with the prior art, the method has the characteristics of simple synthesis method, high yield, superior product performance, strong stability, small pollution hazard and the like, and has the potential of realizing large-scale production.
Description
Technical Field
The invention relates to the technical field of material science, engineering technology and chemistry, in particular to an amorphous noble metal oxide material and a preparation method and application thereof.
Background
Metal oxides are a common presence state for metals. As an important inorganic substance, a metal material has more than two thirds of the element types in the periodic table of elements and has abundant and fascinating physicochemical properties. The rare materials with more complex structures are widely used in the fields of catalysis, electronics, optical imaging, information storage, sensing, medicine and the like, and have irreplaceable functions and scientific and technological application potentials. Researches show that the metal oxide has unique physical and chemical properties, is closely related to a series of physical parameters such as size, shape, oxidation degree and structure, and the like, and the accurate control of the related parameters is very important in the process of preparing the corresponding high-performance special metal oxide material. In particular, amorphous nanomaterials are structurally complex but possess high catalytic selectivity, activity and stability due to their unique disordered structures and internal defects, and have attracted considerable attention in electrochemical applications such as lithium ion batteries, sensors, and water oxidation, among others.
The core problem in the field of material science and catalysis is how to improve the effective utilization rate of noble metal atoms as active sites in a great variety of catalytic reaction processes, thereby improving the activity and reducing the cost of large-scale application. Compared with the traditional noble metal-based catalyst, the amorphous noble metal catalyst not only can obviously improve the effective utilization rate of metal as a catalytic reaction active site according to defects and complex surface structures so as to realize higher quality activity, but also often has better catalytic selectivity and stability. Therefore, the high-performance noble metal amorphous material with the nano structure is prepared on a large scale, and a green and safe production cycle way with high catalytic activity, quality activity and stability is obtained, so that a low-cost and high-efficiency green catalyst is realized and is put into large-scale use, and the method has important scientific significance and economic value.
Considering that the structure of the metallic amorphous material is easy to damage under high-temperature pyrolysis, the preparation method represented by regulating and controlling the precursor and calcining at the present stage has the defects of high metal loading capacity, low relative metal quality activity, small yield and low utilization rate. On the premise of ensuring the performance, the large-scale preparation of the amorphous noble metal oxide catalyst with high quality activity is still a difficult problem to be solved urgently in the related field.
Disclosure of Invention
The invention aims to provide an amorphous noble metal oxide material and a preparation method and application thereof.
The purpose of the invention can be realized by the following technical scheme: a preparation method of an amorphous noble metal oxide material is characterized in that a metal organic salt precursor solution and a reducing agent are mixed to obtain a redox reaction solution, and after full mixing and dispersion, the amorphous noble metal oxide material is obtained in one step through a solvothermal reaction.
Further preferably, the mixing and dispersing process is carried out in an ambient temperature and pressure environment.
Preferably, in the metal organic salt precursor solution, the metal is one or more of Ag, ru, pd, ir, pt, mo, co, ce, cu, fe, and Mn, and the solvent is one or more of water, methanol, ethanol, acetic acid, ethylene glycol, isopropanol, glycerol, acetone, chloroform, diethyl ether, tetrahydrofuran, dimethylformamide, and formaldehyde. Organic ligand groups related to the metal organic salt precursor have key influence factors on the amorphous structure and defect regulation.
The metal salt organic ligand group mainly selected by the invention is an acetylacetone group, and is characterized by having abundant C = O and C-O bonds and being capable of being combined with metal ions with specific valence states, such as Ir 4+ The reaction process is matched to complete the processes of metal reduction, fine crystal nucleation, organic ligand coating growth and curing, so as to form a unique amorphous metal oxide structure.
Further preferably, the preparation method of the metal organic salt precursor solution comprises the steps of dissolving the acetylacetone organic salt in a solvent, adding a chloroiridic acid aqueous solution, and mixing to obtain the metal organic salt precursor solution.
More preferably, the solvent is a mixed solution of water and glycol in a certain proportion, and the glycol has the effects of both the solvent and the reducing agent.
Preferably, the molar concentration of the metal in the metal organic salt precursor solution is 0.001-1.0mol/L.
Preferably, the reducing agent is a weak reducing agent, and controls crystal nucleation and growth.
Further preferably, the reducing agent comprises formic acid, ethanol, acetic acid, ethylene glycol, isopropanol, glycerol, ascorbic acid, glucose, CO (NH) 2 ) 2 、Na 2 SO 3 、K 2 SO 3 Or H 2 C 2 O 4 One or more of (a). Through the chemical reagent with weak reducibility, the metal organic salt precursor is controlled to be reduced, nucleated, aggregated and coated in a high-temperature and high-pressure environment of hydrothermal reaction, and finally the nano-scale dispersed amorphous noble metal oxide material is formed.
Preferably, in the redox reaction solution, the solvent is a mixture of water and one of ethanol, acetic acid, ethylene glycol, isopropanol, glycerol, acetone, chloroform, diethyl ether, tetrahydrofuran, dimethylformamide or formaldehyde.
Preferably, the mixing and dispersing process adopts ultrasonic and magnetic stirring.
Preferably, the solvothermal reaction temperature is 80-300 ℃, and the reaction time is 0-72h.
Further preferably, the solvothermal reaction temperature is 80-300 ℃, and the reaction time is 1-72h.
More preferably, the solvothermal reaction temperature is 80-300 ℃, and the reaction time is 1-48h.
Preferably, the product generated by the solvothermal reaction is further subjected to purification and acid washing for 0-12h, so that a material with better activity and stability can be obtained.
Further preferably, the dried product is subjected to ultrasonic dispersion cleaning for multiple times by using an acid solution with the concentration of 1 mol per liter, and is kept stand for 1-12 hours, and the product is subjected to centrifugal cleaning and drying again, so that the high-purity nanoscale dispersed amorphous noble metal oxide composite material can be obtained.
An amorphous noble metal oxide material is prepared by the preparation method.
Preferably, the amorphous noble metal oxide material is dispersed on a nanometer scale.
Further preferably, the prepared nano-grade dispersed amorphous noble metal oxide material is cleaned by centrifugation or vacuum filtration at normal temperature and normal pressure, and is dried to obtain a corresponding high-performance material.
Further preferably, the nano-scale dispersed amorphous noble metal oxide material comprises structures such as monometallic, polymetallic nanoclusters or ultrafine metal oxides.
The application of the amorphous noble metal oxide material is to use the material in hydrogen evolution, oxygen evolution and total hydrolysis reactions.
Solution synthesis, as a conventional method for large-scale preparation of metal materials, can effectively control the growth process of crystals. The traditional method controls the generation of related crystals by controlling the concentration of a solution and changing the temperature, so that the reliability is low, and the yield of products and the utilization rate of metals cannot be greatly improved. Considering that the solvent and the reducing agent are important components influencing the chemical reaction kinetics and the reaction, the growth mechanism of the crystal can be obviously controlled by using the proper solvent and the proper reducing agent, the agglomeration of the metal nano particles is inhibited, the dispersion degree of the metal nano particles in the carrier is improved, more active sites are further exposed, and the nano-scale dispersed metal atom composite material with high quality activity and specific activity is obtained. In addition, the precursor selects corresponding organic metal salts, crystal nucleation is controlled in a solvothermal controllable high-pressure high-temperature reaction environment, organic functional groups are doped into the product, and the amorphous oxide metal material with characteristics can be generated. Therefore, the invention provides and realizes a method for optimizing the composition of the solvent and the reducing agent, and realizes the method and the process for preparing the large-scale nano-dispersed amorphous noble metal oxide high-performance functional material by controlling the preparation process of the precursor and the solvothermal reaction conditions and selecting the special organic metal salt precursor.
The reaction system constructed by the invention is a liquid phase solvent thermal oxidation reduction reaction system, and chemical reduction and thermal reduction are carried out by ensuring that the carrier and the precursor are uniformly dispersed in the solvent.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a synthesis method of a high-quality active high-performance nanoscale dispersed amorphous noble metal oxide material, which has simple process and easy operation, effectively adsorbs and stabilizes metal clusters obtained by various processes such as chemical reduction, thermal reduction and the like on the surfaces of various carriers, controls the growth of crystals and ligands of the carriers, and is suitable for the preparation process of the amorphous noble metal oxide material with various metals such as Ag, ru, pd, ir, pt, mo, co, ce, cu, fe, mn and the like and a transition metal nano structure;
2. the method is different from the traditional high-temperature calcination and impregnation method, can effectively regulate and control the metal dispersion degree and the metal loading capacity by controlling the type of the precursor and the concentration ratio of the synthesized nano material, has the advantages of low metal loading capacity, high efficiency, strong applicability and the like, and has remarkable advantages in the large-scale commercial development process;
3. the method selects the correct metal organic salt precursor, and utilizes the methods of ultrasonic dispersion and magnetic stirring to ensure that the precursor is fully and uniformly dispersed in the solvent, thereby being a key factor for regulating and controlling the final appearance and distribution of the material;
4. the invention reduces the metal organic salt precursor into the metal amorphous state through the reaction of the weak reducing agent at high temperature, and compared with the traditional impregnation method and pyrolysis method for preparing the noble metal crystal load material, the method has the characteristics of uniform load, adjustable defect structure, high metal activity and the like.
Drawings
FIG. 1 is a transmission electron microscope image of an iridium molybdenum oxide amorphous material prepared by the method of the present invention;
FIG. 2 is a scanning transmission electron microscope image of the amorphous iridium molybdenum oxide material prepared by the method of the present invention;
FIG. 3 is a graph of performance of oxygen evolution reactions for an iridium molybdenum oxide amorphous material;
FIG. 4 is a scanning transmission electron microscope image of an iridium molybdenum oxide amorphous material loaded on a carbon nanosphere;
FIG. 5 is an X-ray diffraction pattern of a series of noble metal oxide amorphous materials;
FIG. 6 is a stability test chart of the iridium molybdenum oxide amorphous material under a long-time oxygen evolution reaction.
Fig. 7 is a graph comparing the performance of iridium molybdenum oxide amorphous material and a commercial catalyst for a two-electrode acid environment full hydrolysis system.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
Example 1
And (3) preparing the nano iridium molybdenum oxide amorphous composite material.
First, a quantity of molybdenum acetylacetonate is applied in a volume ratio of about 4:1 of the aqueous solution A of the water/ethylene glycol mixed solution is dissolved to obtain a molybdenum acetylacetonate dispersion B. Subsequently, a chloroiridic acid solution was added into dispersion B and mixed to make an iridium concentration (about 2mM L) -1 ) And molybdenum acetylacetonate (about 3mg ml) -1 ) The mixed solution of water and glycol is used as the reaction solution of the system, and the glycol in the solution is simultaneously used as Ir in the chloroiridic acid 4+ A metal precursor reducing agent. Next, the reaction solution was placed in an ultrasonic cleaner and dispersed at full power of 300W for at least 30 minutes. And after the ultrasonic dispersion is finished, adding magnetons into the reaction solution, and continuing to perform magnetic stirring dispersion, wherein the rotating speed is kept above 900rpm, and the stirring time is not less than 12h. And immediately putting the PPL lining filled with the uniformly dispersed reaction liquid into a Teflon hydrothermal reaction kettle, carrying out solvent heat sealing reaction for 6-48 hours at 160 ℃, then, completing material recovery and cleaning by centrifugal separation, and naturally drying at room temperature. The dried product is subjected to ultrasonic dispersion cleaning for multiple times by using hydrochloric acid with the concentration of one mole, and is kept stand for 1-6 hours, and the product is subjected to centrifugal cleaning and drying again to obtain high-purity nanoscale dispersed iridium molybdenum oxideA compound amorphous composite material.
The transmission and scanning transmission electron microscope images of the amorphous composite material of the nano iridium molybdenum oxide prepared by the embodiment are shown in fig. 1-2, and it can be seen from the images that in the high-angle annular dark field image, the amorphous material exists in a whole block and has no obvious particle distribution. Under a high-definition transmission electron microscope, the iridium molybdenum oxide amorphous composite material can be observed to have the size of about 50-100 nanometers and be horizontally dispersed in a nanometer mode, the appearance of a crystal face and the existence of lattice stripes are not observed under the high-definition transmission electron microscope, and a lattice does not appear in Fourier analysis.
The nano-scale iridium molybdenum oxide amorphous composite material prepared by the embodiment is used for hydrogen evolution, oxygen evolution and total hydrolysis reaction. The sulfuric acid solution with the electrolyte concentration of 0.5 mol/L is adopted in the test, the test method is that ink fully mixed with the nanoscale iridium molybdenum oxide amorphous composite material and the nanocarbon is dripped on a glassy carbon electrode with the diameter of 5 mm, the glassy carbon electrode is manufactured after complete drying, then the relation between voltage and current density is tested through a three-electrode system (silver/silver chloride is used as a reference electrode, and a carbon rod is used as a counter electrode), and the results are shown in fig. 3, fig. 4 and fig. 6, which show that the composite material in the embodiment has excellent oxygen evolution catalysis performance, and the overpotential only needs 361 millivolts under the current density of 100 milliamperes per square centimeter. And simultaneously has excellent stability of acidic oxygen evolution reaction. Under a scanning transmission microscope, the nano iridium molybdenum oxide amorphous composite material can be observed to be fully dispersed and become fine nanoclusters loaded in 40-60 nanometer carbon spheres.
Example 2
Preparing the nanometer iridium cerium oxide amorphous composite material.
Firstly, weighing a certain amount of cerium acetylacetonate, and dissolving the cerium acetylacetonate in an aqueous solution A of a water/ethylene glycol mixed solution with a volume ratio of 4:1 to obtain a cerium acetylacetonate dispersion B. During this time, chloroiridic acid was added into dispersion liquid B and mixed to make a water/ethylene glycol mixed solution of iridium concentration and cerium acetylacetonate as a reaction solution. Next, the reaction solution was placed in an ultrasonic cleaner and dispersed at a full power of 300W for 30 minutes. And after the ultrasonic dispersion is finished, adding magnetons into the reaction solution to continue magnetic stirring dispersion, and keeping the rotation speed at more than 900rpm for not less than 12h. And immediately putting the PPL lining filled with the uniformly dispersed reaction liquid into a Teflon hydrothermal reaction kettle, carrying out solvent heat sealing reaction for 6-48 hours at the temperature of 160 ℃, completely completing material recovery and cleaning by utilizing centrifugal separation, and naturally drying at room temperature. Thus obtaining the nano-dispersed iridium cerium oxide amorphous composite material.
Example 3
Preparing the nano iridium iron oxide amorphous composite material.
Firstly, weighing a certain amount of ferric acetylacetonate, and dissolving the ferric acetylacetonate by using an aqueous solution A of a water/ethylene glycol mixed solution with a volume ratio of 4:1 to obtain a ferric acetylacetonate dispersion liquid B. During this time, chloroiridic acid was added into dispersion liquid B and mixed to make a water/ethylene glycol mixed solution of iridium concentration and iron acetylacetonate as a reaction solution. Next, the reaction solution was placed in an ultrasonic cleaner and dispersed at a full power of 300W for 30 minutes. And after the ultrasonic dispersion is finished, adding magnetons into the reaction solution, and continuing to perform magnetic stirring dispersion, wherein the rotating speed is kept above 900rpm, and the stirring time is not less than 12h. And immediately putting the PPL lining filled with the uniformly dispersed reaction liquid into a Teflon hydrothermal reaction kettle, carrying out solvent heat sealing reaction for 6-48 hours at the temperature of 160-200 ℃, completely completing material recovery and cleaning by utilizing centrifugal separation, and naturally drying at room temperature. So as to obtain the nano-dispersed iridium iron oxide amorphous composite material.
Example 4
And (3) preparing the nano iridium cobalt oxide amorphous composite material.
Firstly, weighing a certain amount of cobalt acetylacetonate, and dissolving the cobalt acetylacetonate in an aqueous solution A of a water/ethylene glycol mixed solution with a volume ratio of 4:1 to obtain a cobalt acetylacetonate dispersion liquid B. During this time, chloroiridic acid was added into dispersion liquid B and mixed to make a water/ethylene glycol mixed solution of iridium concentration and cobalt acetylacetonate as a reaction solution. Next, the reaction solution was placed in an ultrasonic cleaner and dispersed at a full power of 300W for 30 minutes. And after the ultrasonic dispersion is finished, adding magnetons into the reaction solution, and continuing to perform magnetic stirring dispersion, wherein the rotating speed is kept above 900rpm, and the stirring time is not less than 12h. And then immediately putting the PPL lining filled with the uniformly dispersed reaction liquid into a Teflon hydrothermal reaction kettle, carrying out solvent heat seal reaction for 6-48 hours at the temperature of 160-200 ℃, completely completing material recovery and cleaning by utilizing centrifugal separation, and naturally drying at room temperature. The nanometer-level dispersed iridium cobalt oxide amorphous composite material can be obtained.
Example 5
And (3) preparing the nano iridium-carbon composite material.
Firstly, weighing a certain amount of XC72R carbon carriers (hollow carbon spheres with the diameter of 40-60 nanometers), adding an aqueous solution A of a water/ethylene glycol mixed solution with the volume ratio of 4:1, and adding and mixing an aqueous solution of chloroiridic acid during the period to obtain a reaction solution B. Next, the reaction solution was placed in an ultrasonic cleaner and dispersed at a full power of 300W for 30 minutes. And after the ultrasonic dispersion is finished, adding magnetons into the reaction solution, and continuing to perform magnetic stirring dispersion, wherein the rotating speed is kept above 900rpm, and the stirring time is not less than 12h, so that the iridium ion and water/ethylene glycol mixed reaction solution with uniformly dispersed carbon carriers is prepared. And then immediately putting the uniformly dispersed reaction solution into a PPL lining, then putting the PPL lining into a Teflon hydrothermal reaction kettle, carrying out solvent heat seal reaction for 6-48 hours at the temperature of 160-200 ℃, completely completing material recovery and cleaning by utilizing centrifugal separation, and naturally drying at room temperature. Thus obtaining the iridium-carbon composite material with nano-scale dispersion.
As illustrated in fig. 5, it can be found in the X-ray diffraction spectrum that the peak shape of the nano-scale dispersed iridium-carbon composite material is widened seriously, which indicates that the material has weak crystallinity and is a structure similar to an amorphous state. The starting position of the diffraction broad peak is close to the diffraction peak of the (111) crystal face of the iridium element, and the existence of the iridium element is proved. Compared with samples prepared in other examples, the nanometer iridium molybdenum, iridium iron and iridium cobalt oxide has very serious broadening in X-ray diffraction spectrogram and does not form peaks, and the unique amorphous structure can be judged by combining a transmission electron microscope picture and a scanning transmission electron microscope picture.
The invention has the characteristics of simple synthesis method, high yield, superior product performance, strong stability, small pollution hazard and the like, and as shown in an illustration, the invention has excellent catalytic performance and stability and has the potential of realizing large-scale production when being used as a catalytic material for hydrogen production by hydrolysis of a proton exchange membrane electrolytic cell.
Comparative example 1
Comparison of Total hydrolysis Performance between commercial platinum carbon catalyst and Iridium oxide catalyst
The acidic proton exchange membrane electrolytic water system has the characteristics of small quantity, high energy density, mature membrane separation and stability technology and the like. However, many transition metals and oxides thereof having excellent ability to promote water splitting do not exist stably due to the strong acid environment. At the cathode end, the oxygen evolution reaction requires higher overpotential to drive the reaction to proceed due to slow catalytic reaction kinetics, which restricts the electrolysis of water by the acidic proton exchange membrane. The nano-scale noble metal amorphous oxide composite material prepared by the invention has excellent hydrogen evolution and oxygen evolution reaction promotion performance and excellent stability. Compared with the current most excellent commercial catalyst, namely the anode is a platinum carbon catalyst, and the cathode is an iridium oxide catalyst, the catalytic performance is obviously improved. As shown in fig. 7, only 1.55 volts is required to drive the reaction to occur at current densities up to 10 milliamps per square centimeter.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make modifications and alterations without departing from the scope of the present invention.
Claims (10)
1. A preparation method of an amorphous noble metal oxide material is characterized in that metal organic salt precursor solution is uniformly mixed, a reducing agent is added to obtain redox reaction solution, and the redox reaction solution is mixed and dispersed and then undergoes a solvothermal reaction to obtain the amorphous noble metal oxide material.
2. The method according to claim 1, wherein the metal in the metal organic salt precursor solution is one or more of Ag, ru, pd, ir, pt, mo, co, ce, cu, fe, and Mn, and the solvent is one or more of water, methanol, ethanol, acetic acid, ethylene glycol, isopropanol, glycerol, acetone, chloroform, diethyl ether, tetrahydrofuran, dimethylformamide, and formaldehyde.
3. The method of claim 1, wherein the molar concentration of the metal in the metal organic salt precursor solution is 0.001-1.0mol/L.
4. The method of claim 1, wherein the reducing agent comprises formic acid, ethanol, acetic acid, ethylene glycol, isopropanol, glycerol, ascorbic acid, glucose, CO (NH) 2 ) 2 、Na 2 SO 3 、K 2 SO 3 Or H 2 C 2 O 4 One or more of (a).
5. The method according to claim 1, wherein the solvent in the redox reaction solution is a mixture of water and one of ethanol, acetic acid, ethylene glycol, isopropanol, glycerol, acetone, chloroform, diethyl ether, tetrahydrofuran, dimethylformamide, or formaldehyde.
6. The method of claim 1, wherein the mixing and dispersing process is performed by ultrasonic and magnetic stirring.
7. The method of claim 1, wherein the solvothermal reaction is performed at 80-300 ℃ for 1-72 hours.
8. An amorphous noble metal oxide material, characterized in that it is prepared by the process according to any one of claims 1 to 7.
9. The amorphous noble metal oxide material of claim 8, wherein the amorphous noble metal oxide material is nano-scale dispersed.
10. Use of an amorphous noble metal oxide material according to claim 8 for hydrogen evolution, oxygen evolution and perhydrolysis reactions.
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