Local amorphous porous iridium oxide, preparation thereof and application of local amorphous porous iridium oxide in OER catalysis

Abstract

The invention belongs to the field of water electrolysis hydrogen production electrode materials, and particularly relates to a local amorphous porous iridium oxide, preparation thereof and application of the local amorphous porous iridium oxide in OER catalyst.The preparation method of the local amorphous porous iridium oxide comprises the steps that a mixed raw material of an iridium source, an organic-inorganic synergistic regulator and sodium-based composite salt is subjected to roasting treatment, and the local amorphous porous iridium oxide is obtained; and then carrying out quenching treatment to obtain the local amorphous porous iridium oxide. The organic-inorganic synergistic regulator comprises a La inorganic substance and an organic substance shown as a formula 1 (# imgabs0 #) in a weight ratio of (1-10): (10-50); the sodium-based composite salt comprises sodium nitrate and sodium chloride; in the formula 1, R is H, alkyl or substituted alkyl. The material prepared by the preparation method disclosed by the invention is excellent in performance under a high-temperature condition, and can stably operate under the conditions of frequent start and stop and large current.

Description

Technical Field

[0001] The present invention belongs to the field of catalytic materials, and in particular to the field of OER catalysis. Background Art

[0002] As the global energy structure transforms towards green and low-carbon, proton exchange membrane water electrolysis (PEMWE) technology has become one of the core research directions in the field of hydrogen energy due to its high efficiency, rapid response and cleanliness. However, the high overpotential of the anodic oxygen evolution reaction (OER) and the insufficient catalyst stability are still the key bottlenecks restricting its large-scale application. 2 ) is considered an ideal OER catalyst due to its excellent catalytic activity and stability in acidic environments, but its high cost, low atomic utilization, and limited active sites due to its crystal structure are urgent issues that need to be addressed. Therefore, it is of great significance to modify iridium oxide to improve its catalytic activity and realize its application in proton exchange membrane electrolyzers.

[0003] Currently, most commercial iridium-based catalyst materials are rutile-phase crystalline iridium dioxide prepared by the Adams method, which is large in size, easy to agglomerate, and has a small number of active sites. However, the proton exchange membrane (PEM) prepared using commercial iridium dioxide catalysts is not active enough, resulting in a high iridium loading in the electrolyzer.

[0004] In view of the problems faced by iridium-based catalyst materials, the prior art has also proposed some optimization solutions such as doping and structural modification. For example, the Chinese patent document with publication number CN116463672A discloses a phosphorus-doped iridium dioxide and its preparation method and application. Another example is the Chinese patent document with publication number CN109107570A discloses a SrIrO 3 Catalyst scheme.

[0005] In summary, although the existing doping process can optimize the iridium lattice, which helps to improve performance and reduce costs, the existing materials are mainly crystalline phases, and the crystalline phase IrO 2 It has a stable crystal structure and can operate stably under large current, but the crystalline phase IrO 2 Due to the low activity caused by insufficient active sites, the crystalline IrO 2 Amorphization will cause the amorphous form of the amorphous phase to dissolve easily and collapse under high temperature conditions, frequent start and stop and high current conditions, resulting in reduced performance. It cannot adapt to high-density current operation and frequent start and stop under industrial conditions. Therefore, designing a localized amorphous porous iridium oxide with a crystalline phase forming a skeleton to support the amorphous phase has far-reaching significance for the industrial application of PEM water electrolysis. Summary of the invention

[0006] In view of the problem that the existing iridium oxide has unsatisfactory catalytic activity, the first purpose of the present invention is to provide a method for preparing locally amorphous porous iridium oxide, aiming to prepare an OER catalytic active material with local amorphous and excellent activity.

[0007] The second purpose of the present invention is to provide a local amorphous porous iridium oxide prepared by the preparation method and its application in OER catalysis.

[0008] The third object of the present invention is to provide a device comprising the local amorphous porous iridium oxide.

[0009] Most of the iridium oxides synthesized by the prior art are rutile phase iridium dioxide crystal materials, which also have the disadvantages of small number of active sites and low mass activity. The amorphous modification of iridium oxide in the prior art is prone to dissolution and structural collapse under frequent start-stop and high current conditions, resulting in reduced performance. In addition, the working temperature under industrial conditions is usually ≥60°C, and the iridium oxide synthesized by the prior art will accelerate deactivation under high temperature conditions. In view of this problem, the present invention has been studied in depth and provides the following improvement scheme:

[0010] A method for preparing a localized amorphous porous iridium oxide comprises calcining a mixed raw material of an iridium source, an organic-inorganic synergistic regulator (also referred to as a synergistic regulator or regulator in the present invention) and a sodium-based composite salt, and then rapidly cooling the mixed raw material to obtain the localized amorphous porous iridium oxide;

[0011] The organic-inorganic synergistic regulator includes La inorganic matter and organic matter of formula 1 in a weight ratio of 1-10:10-50; the sodium-based composite salt includes sodium nitrate and sodium chloride;

[0012] Formula 1

[0013] In formula 1, R is H, C 1 ~C 6 The substituted alkyl group is an alkyl group or a substituted alkyl group; the substituted alkyl group is 1 ~C 6 The alkyl group has at least one substituent selected from the group consisting of mercapto, hydroxyl, carboxyl, amino, amidinyl, thienyl and pyranyl.

[0014] The present invention innovatively adopts the organic-inorganic regulator and sodium-based composite salt to assist the calcination treatment of the iridium source, and further cooperates with the rapid cooling treatment, so that unexpected synergy can be achieved, and the physical and chemical structure of iridium oxide can be effectively regulated, and a material with a new physical and chemical structure with rutile phase oxide as a porous skeleton and amorphous components grown in situ on the surface can be prepared. Studies have shown that the material with the characteristics prepared by the preparation method of the present invention has good conductivity and is better than the existing IrO in mass activity under the three-electrode system.2 The catalyst has excellent performance under high temperature conditions and can operate stably under frequent start-stop and high current conditions.

[0015] In the present invention, the iridium source comprises at least one of chloroiridic acid, iridium trichloride and iridium acetylacetonate.

[0016] In the present invention, the organic-inorganic synergistic regulator in the ratio is innovatively used, which can help regulate the crystal and amorphous morphology of iridium oxide, and improve the morphology and bonding interface of the crystal skeleton support structure and the locally grown amorphous. In addition, combining it with the sodium-based composite salt of the component helps to further optimize the composite interface and distribution effect between the amorphous and the crystal.

[0017] In the organic-inorganic synergistic regulator, the La inorganic substance includes at least one of lanthanum nitrate, lanthanum chloride, lanthanum acetate, lanthanum sulfate and lanthanum bromide.

[0018] In the formula 1, R is H or a substituted alkyl group, and the substituted alkyl group is 1 ~C 6 The alkyl carbon chain of the alkyl group has at least one of a mercapto group and a carboxyl group as substituent.

[0019] Preferably, the formula 1 includes at least one of formula 1a and formula 1b, wherein formula 1a is a compound of formula 1 in which R is a mercapto-substituted alkyl group. The formula 1b is a compound of formula 1 in which R is a carboxyl-substituted alkyl group. The mercapto-substituted alkyl group is, for example, 1 ~C 6 The alkyl group of the compound has a thiol substituent. The carboxyl substituted alkyl group is, for example, 1 ~C 6 A compound having a carboxyl substituent on the alkyl group.

[0020] The present invention's research shows that the combination of Formula 1a and other components and preparation processes of the present invention can further facilitate the preparation of the crystalline-amorphous material and help improve the start-stop and high-temperature stability of the prepared material.

[0021] More preferably, the formula 1 comprises formula 1a and formula 1b in a weight ratio of 1:0.5-2.

[0022] The present invention also shows that the use of the combined formula 1 can further optimize the physical and chemical structure of the prepared material, which helps to further improve the start-stop and high-temperature stability of the prepared material.

[0023] Preferably, in the organic-inorganic synergistic regulator, the weight ratio of the La inorganic substance to the organic substance of formula 1 is 1:3 to 6. Studies have shown that at this preferred ratio, it helps to further enhance the synergy of the organic-inorganic synergistic regulator in constructing crystal-amorphous, and helps to further enhance the high temperature stability and start-stop stability of the material.

[0024] In the present invention, in the sodium-based composite salt, the weight ratio of sodium nitrate to sodium chloride is 60-100:10-40; further, it can be 8-9.5:1.

[0025] In the present invention, the weight ratio of the iridium source, the organic-inorganic synergistic regulator, and the sodium-based composite salt is 5-20:5-20:100-300; further, it can be 8-12:5-15:200.

[0026] In the present invention, the mixed raw material can be obtained by mixing the raw materials in solid or liquid phase. For example, as an optional scheme, the iridium source, the organic-inorganic synergistic regulator, and the sodium-based composite salt are mixed in liquid phase and the pH is adjusted to 7±0.5 and then subjected to a desolventizing treatment to obtain the mixed raw material. The present invention shows that the use of this liquid phase mixing method can further enhance the synergy between the components, help to further improve the prepared local amorphous porous iridium oxide, and help to improve the high temperature and start-stop stability of the material.

[0027] In the present invention, the atmosphere in the calcination stage is an oxygen-containing atmosphere, which may be, for example, oxygen, a mixed gas of oxygen-inert gas, or air.

[0028] In the present invention, the calcination temperature is 300-550° C., further 400-500° C., and further 420-460° C. Studies have shown that the preferred calcination temperature can further facilitate the preparation of the crystalline-amorphous material and help improve the high temperature and start-stop stability of the prepared material.

[0029] In the present invention, the calcination time is 0.5 to 4 hours; further, it can be 1 to 2 hours.

[0030] In the present invention, the calcined product assisted by the organic-inorganic synergistic regulator and the sodium-based composite salt is innovatively subjected to rapid cooling treatment, which helps to further optimize the amorphous-crystalline composite interface and improve the stability and performance of the material.

[0031] In the present invention, the calcined product can be brought into contact with a cooling medium while hot to achieve rapid cooling. In the present invention, as an practicable solution, the temperature difference between the calcined product and the cooling medium when in contact can be above 200°C. In addition, the calcined product can be brought into contact with the cooling medium directly, or a heat-conducting container loaded with the calcined product can be brought into contact with the cooling medium directly while hot.

[0032] In the present invention, the medium for rapid cooling is at least one of a solid, a liquid or a gas with a temperature below 50° C. For example, considering the cost, the cooling medium may be water. In addition, cold gas may be introduced for air cooling.

[0033] The present invention also provides a local amorphous porous iridium oxide prepared by the preparation method, which comprises rutile phase iridium dioxide and locally grown amorphous phase iridium dioxide supported by the rutile phase iridium dioxide as a skeleton.

[0034] The preparation method of the present invention can produce a material with completely new physical and chemical characteristics, and the material with the characteristics produced by the preparation method can unexpectedly and effectively improve the performance of iridium oxide.

[0035] The present invention also provides an application of the local amorphous porous iridium oxide prepared by the preparation method as an OER catalytic material. In the present invention, based on the good OER performance of the material, a water electrolysis device can be prepared based on the material.

[0036] The present invention also provides an OER catalytic device, which comprises the local amorphous porous iridium oxide prepared by the preparation method, or is prepared by the local amorphous porous iridium oxide.

[0037] The OER catalytic device described in the present invention may be, for example, a conventional water electrolysis hydrogen production device, and may further be a proton exchange membrane water electrolysis hydrogen production device.

[0038] Beneficial Effects

[0039] The present invention innovatively adopts the organic and inorganic regulator and the sodium-based composite salt to be used in combination for the roasting of the iridium source, and further cooperates with the rapid cooling treatment, which is helpful to prepare the rutile phase-amorphous composite phase iridium oxide.

[0040] The preparation method of the present invention can prepare iridium oxide with a completely new physical and chemical structure, and the iridium oxide prepared by the preparation method can unexpectedly take into account excellent OER performance. For example, the material has excellent performance under high temperature conditions and can operate stably under frequent start-stop and high current conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 TEM images of the catalyst prepared in Example 1, wherein (a) is a low-resolution transmission electron microscopy image; (b) is a high-resolution transmission electron microscopy image;

[0042] Figure 2 The transmission electron microscopy images of the material prepared in Comparative Example 1, wherein (a) is a low-resolution transmission electron microscopy image; (b) is a high-resolution transmission electron microscopy image;

[0043] Figure 3 X-ray diffraction patterns of iridium oxide nanomaterials prepared in Example 1, Example 2-D and Comparative Example 1;

[0044] Figure 4 Performance diagram of the three-electrode system of iridium oxide nanomaterials prepared in some cases and comparative example 1;

[0045] Figure 5 Example 1, Comparative Example 1 and commercial IrO 2 Stability test diagram of the three-electrode system;

[0046] Figure 6 The figures are performance diagrams of the iridium oxide catalysts prepared in Example 1 and Comparative Example 1 for use in PEM electrolysis devices; wherein, (a) is a voltage-current relationship diagram of the iridium oxide catalysts prepared in Example 1 and Comparative Example 1 for use in PEM electrolysis devices; (b) is a polarization voltage loss decomposition diagram of the iridium oxide catalysts prepared in Example 1 for use in PEM electrolysis devices; (c) is a comparison diagram of overpotential losses of the iridium oxide catalysts prepared in Example 1 and Comparative Example 1 for use in PEM electrolysis devices; and (d) is a stability test diagram of the iridium oxide catalysts prepared in Example 1 for use in PEM electrolysis devices. DETAILED DESCRIPTION

[0047] The following specific embodiments are intended to further illustrate the present invention in detail, rather than to further limit the scope of protection of the claims of the present invention.

[0048] The reagents involved in the following examples, unless otherwise specified, are commercial reagents purchased directly from the market.

[0049] Example 1

[0050] Step 1: Weigh 0.1 g of iridium source (hydrated iridium trichloride), 2 g of sodium-based complex salt (including 1.8 g of sodium nitrate and 0.2 g of sodium chloride) and dissolve them in 5 ml of water, stir for 10 min, ultrasonicate for 15 min, add 59 mg of synergistic regulator (including 50 mg of formula 1 (in this case, formula 1A, whose structure is ) and 9 mg lanthanum nitrate), ultrasonicated again for 15 min, adjusted the solution pH to 7 with sodium hydroxide to obtain solution A, transferred the final solution A to a glass test tube, evaporated to dryness at 110 ° C (marked as T1) for 12 hours. After cooling to room temperature, the product was collected and ball milled for 30 min to obtain a mixture;

[0051] Step 2:

[0052] The mixture is calcined at 450°C in a muffle furnace in an air atmosphere for 1 h. The mixed melt obtained after the muffle furnace is burned out is placed in a crucible. The bottom of the crucible is placed in water at 5-15°C for rapid cooling until the melt crystallizes into blocks. The obtained crystals are washed with water and ethanol several times and then dried to obtain a locally amorphous porous iridium oxide catalyst (also called catalyst).

[0053] TEM images of the prepared catalysts Figure 1 , Figure 1 (a) shows that the prepared catalyst has a porous morphology. Figure 1 The high-resolution TEM in (b) shows that the porous structure is formed by the in-situ growth of the amorphous component on the skeleton composed of the crystalline component.

[0054] The XRD patterns of the prepared catalysts are shown in Figure 3 It can be seen that the prepared catalyst is composed of rutile phase IrO 2 And amorphous phase IrOx.

[0055] test:

[0056] 1. Electrochemical detection

[0057] The prepared catalyst was used for oxygen evolution reaction in an acidic environment. A three-electrode test system was adopted, with Pt sheet as the counter electrode and saturated calomel electrode as the reference electrode. 2 mg of the catalyst was dispersed in 400 μL of a mixed solvent of water and ethanol (v water: v ethanol = 1:3). Ultrasonication was performed to obtain a uniformly dispersed slurry. A certain amount of the slurry was evenly drop-coated on the surface of a 5 mm glassy carbon electrode as the working electrode. The loading was 0.25 mg / cm 2 0.5 M sulfuric acid solution was selected as the electrolyte, and the electrochemical data were tested by linear sweep voltammetry with a scan rate of 5 mV / s and a current of 10 mA / cm at 60°. 2 The long-term stability of the OER reaction was tested at a current density of 1.34 W. The electrochemical detection results are shown in Figure 4~Figure 5 .

[0058] In order to detect the performance of the catalyst and simulate industrial production conditions, the anode current was tested at 60°C, and the test was restarted after pausing for 1 hour every 24 hours. The test results of the activity decay rate after 100 hours of testing are shown in Tables 1 and 2.

[0059] 2. Membrane Electrode Preparation and PEM Testing

[0060] The prepared catalyst was sprayed on the surface of Nifion115 membrane as anode catalyst, and 60% commercial Pt / C was used as cathode. 20 mg of the prepared catalyst was dispersed in a mixed solution containing 1 ml of 5% Nifion solution and 1 ml of isopropanol. The mixture was stirred evenly for 30 min using a mixer. Then, 1 ml of isopropanol was added to the mixed solution and stirred evenly for 30 min using a mixer. The slurry was washed out with a mixed solution of 1 ml of water and 1 ml of isopropanol and dispersed evenly by ultrasonication for 30 min. The slurry was sprayed on the anode side of Nifion115 membrane using a manual spray gun. The catalyst loading was 1 mg / cm 2 The prepared membrane electrode was assembled into a PEM and the 2 The electrochemical data were tested after activation at a current density of 1 A / cm after heating to 60°C. 2 The stability of the catalyst is measured under current density. The electrolysis performance test results of the material are shown in Figure 6 .

[0061] Example 2

[0062] Compared with Example 1, the only difference is that the type and composition of the synergistic regulator are changed. The experimental groups are:

[0063] Group A: Formula 1B ( ) as formula 1;

[0064] Group B: Formula 1C ( ) as formula 1;

[0065] Group C: Lanthanum chloride was used to replace the lanthanum nitrate;

[0066] Group D: The weight ratio of control formula 1 and lanthanum nitrate is 10:3;

[0067] Other operations and parameters are the same as in Example 1.

[0068] Example 3

[0069] Compared with Example 1, the only difference is that the conditions of step 1, the experimental groups are:

[0070] Group A: changing the ratio of sodium-based composite salt and the weight ratio of Ir, synergistic regulator and sodium-based composite salt (the weight ratio of sodium nitrate and sodium chloride is 8.5:1) to 8:12:200;

[0071] Group B: The iridium source, the synergistic regulator and the sodium-based composite salt are subjected to conventional solid phase grinding to obtain a mixture.

[0072] Other operations and parameters are the same as in Example 1.

[0073] Example 4

[0074] Compared with Example 1, the only difference is that the calcination temperature in step 2 is changed to 500° C. and the calcination time is changed to 1.5 h. Other operations and parameters are the same as in Example 1.

[0075] Example 5

[0076] Compared with Example 1, the only difference is that after the roasting is completed, air cooling treatment (gas-based rapid cooling) is performed with air at room temperature, and other operations and parameters are the same as in Example 1.

[0077] Comparative Example 1

[0078] Compared with Example 1, the only difference is that no synergistic regulator is added, and other operations and parameters are the same as Example 1. TEM and XRD of the material are shown in Figure 2 and Figure 3 .

[0079] The TEM image shows that the catalyst synthesized without adding the synergistic regulator is agglomerated particles. The XRD results show that the catalyst synthesized in Comparative Example 1 is rutile IrO 2 .

[0080] Comparative Example 2

[0081] Compared with Example 1, the only difference is that no lanthanum nitrate is added to the synergistic regulator, and the total amount of the synergistic regulator and other operations and parameters are the same as in Example 1.

[0082] Comparative Example 3

[0083] Compared with Example 1, the only difference is that in the synergistic regulator, comparative formula A ( ) replaces the formula 1, and other operations and parameters are the same as those in Example 1.

[0084] Comparative Example 4

[0085] Compared with Example 1, the only difference is that in the synergistic regulator, comparative formula B ( ) replaces the formula 1, and other operations and parameters are the same as those in Example 1.

[0086] Comparative Example 5

[0087] Compared with Example 1, the only difference is that in the synergistic regulator, the ratio of Formula 1 to lanthanum nitrate is 1:3, and the total amount of the synergistic regulator and other operations and parameters are the same as in Example 1.

[0088] Comparative Example 6

[0089] Compared with Example 1, the only difference is that cobalt nitrate is used to replace the lanthanum nitrate in the synergistic regulator, and the total amount of the synergistic regulator and other operations and parameters are the same as in Example 1.

[0090] Comparative Example 7

[0091] Compared with Example 1, the only difference is that no sodium-based composite salt is added, and other operations and parameters are the same as Example 1.

[0092] Comparative Example 8

[0093] Compared with Example 1, the only difference is that single sodium nitrate is used to replace the sodium-based composite salt, and the amount of sodium-based composite salt and other operations and parameters are the same as in Example 1.

[0094] Comparative Example 9

[0095] Compared with Example 1, the only difference is that single sodium chloride is used to replace the sodium-based composite salt, and the amount of the sodium-based composite salt and other operations and parameters are the same as in Example 1.

[0096] Comparative Example 10

[0097] Compared with Example 1, the only difference is that after the roasting is completed, the furnace is cooled (slowly cooled), and the other operations and parameters are the same as those in Example 1.

[0098] The calculation results of the overpotential of the catalysts prepared in each embodiment and each comparative example under a constant temperature environment of 60° C. and the activity decay rate after the start-stop test was performed every 24 hours for 100 hours are listed in Tables 1 and 2.

[0099]

[0100] It can be seen from Example 1 and Comparative Examples 1 to 10 in Table 1 and Table 2 that the organic-inorganic regulator and the sodium-based composite salt are used together for the calcination of the iridium source, and further combined with a rapid cooling treatment, which helps to prepare rutile phase-amorphous composite phase iridium oxide.

[0101] It can be seen from Examples 1 and 2 that using Formula 1A as Formula 1 can be combined with the process of the present invention to obtain better synergy, which helps to further improve the frequent start and stop of the battery, as well as the high temperature stability.

[0102] It can be seen from Examples 1 and 3 that the use of the liquid phase mixing process described in the present invention can help to further optimize the synergy between components and processes, and help to further improve the frequent start and stop, and high temperature stability of the battery.

Claims

1. A method for preparing a local amorphous porous iridium oxide, characterized in that: The mixed raw material of iridium source, organic-inorganic synergistic regulator and sodium-based composite salt is subjected to roasting treatment, and then subjected to rapid cooling treatment to obtain the localized amorphous porous iridium oxide; The organic-inorganic synergistic regulator includes La inorganic matter and organic matter of formula 1 in a weight ratio of 1-10:10-50; the sodium-based composite salt includes sodium nitrate and sodium chloride; Formula 1; In Formula 1, R is H, a C1-C6 alkyl group or a substituted alkyl group; the substituted alkyl group is a group having at least one substituent selected from the group consisting of a mercapto group, a hydroxyl group, a carboxyl group, an amino group, an amidinyl group, a thienyl group and a pyranyl group on the C1-C6 alkyl group.

2. The method for preparing the local amorphous porous iridium oxide according to claim 1, characterized in that: The iridium source includes at least one of chloroiridic acid, iridium trichloride and iridium acetylacetonate.

3. The method for preparing the local amorphous porous iridium oxide according to claim 1, characterized in that: The La inorganic substance includes at least one of lanthanum nitrate, lanthanum chloride, lanthanum acetate, lanthanum sulfate and lanthanum bromide; In the formula 1, R is H or a substituted alkyl group, and the substituted alkyl group is a substituted alkyl group having at least one of a mercapto group and a carboxyl group as a substituent on the C1-C6 alkyl carbon chain.

4. The method for preparing the local amorphous porous iridium oxide according to claim 1, characterized in that: In the sodium-based composite salt, the weight ratio of sodium nitrate to sodium chloride is 60-100:10-40.

5. The method for preparing the local amorphous porous iridium oxide according to any one of claims 1 to 4, characterized in that: The iridium source, the organic-inorganic synergistic regulator, and the sodium-based composite salt liquid are mixed and the pH is adjusted to 7±0.5, and then a desolventizing treatment is performed to obtain the mixed raw material; The weight ratio of the iridium source, the organic-inorganic synergistic regulator and the sodium-based composite salt is 5-20:5-20:100-300.

6. The method for preparing the local amorphous porous iridium oxide according to claim 1, characterized in that: The atmosphere during the calcination stage is an oxygen-containing atmosphere; The calcination temperature is 300~550℃; The calcination time is 0.5~4h.

7. The method for preparing the local amorphous porous iridium oxide according to claim 1, characterized in that: The medium for the rapid cooling treatment is at least one of a solid, a liquid or a gas with a temperature below 50°C.

8. A localized amorphous porous iridium oxide prepared by the preparation method according to any one of claims 1 to 7, characterized in that: The invention comprises rutile phase iridium dioxide and locally grown amorphous phase iridium dioxide supported by rutile phase iridium dioxide as a framework.

9. An application of the local amorphous porous iridium oxide prepared by the preparation method according to any one of claims 1 to 7, characterized in that: It is used as OER catalytic material.

10. An OER catalytic device, characterized in that: The local amorphous porous iridium oxide comprises the local amorphous porous iridium oxide prepared by the preparation method according to any one of claims 1 to 7, or is prepared by the local amorphous porous iridium oxide.

Images