CN117512678A - Metal oxide coated titanium electrode and preparation method thereof - Google Patents

Metal oxide coated titanium electrode and preparation method thereof Download PDF

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Publication number
CN117512678A
CN117512678A CN202311366623.6A CN202311366623A CN117512678A CN 117512678 A CN117512678 A CN 117512678A CN 202311366623 A CN202311366623 A CN 202311366623A CN 117512678 A CN117512678 A CN 117512678A
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electrode
titanium
titanium substrate
coating
solution
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许轩
王景毅
张军
刘宝仓
荆鹏
菅青娥
白涛
杨益宁
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Inner Mongolia Guangheyuan Nano High Tech Co ltd
Inner Mongolia Kerui Xingyun Technology Incubation Base Co ltd
Inner Mongolia University
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Inner Mongolia Guangheyuan Nano High Tech Co ltd
Inner Mongolia Kerui Xingyun Technology Incubation Base Co ltd
Inner Mongolia University
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • 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
    • C25B11/091—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
    • C25B11/093—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds at least one noble metal or noble metal oxide and at least one non-noble metal oxide
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • 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
    • C25B11/055—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material
    • C25B11/057—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material consisting of a single element or compound
    • C25B11/061—Metal or alloy
    • C25B11/063—Valve metal, e.g. titanium

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

The invention relates to a metal oxide coating titanium electrode and a preparation method thereof. The preparation method comprises the following steps: pretreating a titanium substrate to obtain a titanium substrate with a rough surface; placing the obtained titanium substrate as a cathode in a soluble cerium salt solution, and depositing a layer of Ce (OH) on the surface of the titanium substrate after electrolysis 3 Obtaining Ce (OH) 3 A Ti electrode; ce (OH) to be obtained 3 Placing Ti electrode in ferric salt solution, and performing ion exchange to obtain Fe doped Ce (OH) 3 A Ti electrode; coating a precursor coating solution containing Ir on Fe doped Ce (OH) 3 The Ti electrode surface is dried; sintering the titanium substrate coated with the precursor coating liquid at high temperature to finally form IrO 2 ·CeO 2 ·Fe 2 O 3 And coating a titanium electrode. The method has simple operation and low product cost, and can obtain IrO with high catalytic activity 2 ·CeO 2 ·Fe 2 O 3 The coated titanium electrode has obvious industrialization advantages.

Description

Metal oxide coated titanium electrode and preparation method thereof
Technical Field
The invention relates to the technical field of electrochemistry, in particular to a metal oxide coating titanium electrode and a preparation method thereof.
Background
The metal oxide coating titanium electrode is an electrode structure in which metal oxide is used as a coating to cover the surface of the titanium electrode, the metal oxide coating can provide additional functions and improve the performance of the electrode, the metal oxide coating can improve the catalytic performance and stability of the coated titanium electrode, and the common metal oxide coating comprises tin dioxide (SnO) 2 ) Alumina (Al) 2 O 3 ) And the like, the metal oxide coating has good conductivity, corrosion resistance and catalytic activity, can increase the contact area between the electrode and the reactant, improves the reaction rate and efficiency, and can provide a protective layer to prevent the titanium electrode from being corroded by the environment. The metal oxide coated titanium electrode has wide application in many fields such as batteries, electrolytic cells, photoelectrochemical cells, etc., and its advantages include efficient electron conduction, stable electrochemical performance, and long life.
The existing metal oxide coating titanium electrode is prepared by doping ruthenium, iridium, titanium and tantalum with other metal elements, along with the gradual reduction of noble metal raw material supply, the noble metal raw material price is higher and higher, particularly the noble metal iridium price fluctuation is the largest, so that the production cost of the coating titanium electrode is high, and the substitution of electrode materials with high iridium content and the reduction of the iridium addition in the titanium electrode coating are urgently needed.
The prior patent CN113428942A discloses a noble metal low-temperature coating titanium electrode and a preparation method thereof, wherein a hydrothermal reaction is adopted to prepare noble metal oxide nano powder, the noble metal oxide nano powder and resin are uniformly mixed and coated on a titanium substrate, the low-temperature curing is carried out to obtain a coating bottom layer, then an intermediate layer and a surface layer are sequentially coated, and finally, the coating annealing treatment is carried out to obtain the coating titanium electrode with low noble metal content.
The prior patent CN114232018A discloses a preparation method of a coating titanium electrode, which is to prepare a platinum band ruthenium iridium coating titanium electrode by coating ruthenium chloride, chloroiridic acid and chloroplatinic acid on the surface of a titanium substrate and adopting a traditional thermal decomposition method.
In the prior patent CN110272097a, a multidimensional coating electrode of titanium dioxide and a preparation method thereof are disclosed, wherein noble metal nitrate or chloride and butyl titanate are dissolved in an organic solution, and then titanium dioxide is dispersed therein to prepare a coating liquid. Uniformly coating the coating liquid on the surface of a titanium substrate, and preparing the ruthenium iridium-titanium dioxide coating titanium electrode by adopting a traditional thermal decomposition method.
The above patent methods all relate to IrO 2 The preparation of base-coated titanium electrodes is typically carried out with a single metal oxide crystalline phase as the active ingredient, e.g. IrO 2 、RuO 2 And TiO 2 The method comprises the steps of carrying out a first treatment on the surface of the However, there has been no study on a transition metal solid solution and a transition metal doped metal oxide as an active component, and the preparation process of the noble metal coated titanium electrode in the above prior art is complicated and the cost is high. Therefore, it is very important to develop a metal oxide coated titanium electrode with simple structure, low cost, simple preparation method and low noble metal content.
Disclosure of Invention
The invention provides a metal oxide coated titanium electrode and a preparation method thereof, aiming at solving the technical problems of complex structure, complex preparation, high cost and the like of the metal oxide coated titanium electrode with lower noble metal content in the prior art.
The technical scheme adopted by the invention is that the preparation method of the metal oxide coated titanium electrode comprises the following steps:
1) Pretreating a titanium substrate to obtain a titanium substrate with a rough surface;
2) Placing the titanium substrate obtained in the step (1) as a cathode in a soluble cerium salt solution, and depositing a layer of Ce (OH) on the surface of the titanium substrate after electrolysis 3 Obtaining Ce (OH) 3 A Ti electrode;
3) Ce (OH) obtained in the step (2) 3 Placing Ti electrode in ferric salt solution, and performing ion exchange to obtain Fe doped Ce (OH) 3 A Ti electrode;
4) Coating the Fe doped Ce (OH) obtained in the step (3) with an Ir-containing precursor coating solution 3 The Ti electrode surface is dried;
5) Sintering the titanium substrate coated with the precursor coating liquid in the step (4) at a high temperature to form IrO 2 ·CeO 2 ·Fe 2 O 3 And coating a titanium electrode.
Further, the pretreatment method for the titanium substrate in the step (1) comprises the following steps: firstly, carrying out sand blasting grinding and deionized water cleaning on a titanium substrate; secondly, ultrasonically cleaning the titanium substrate by using acetone, and cleaning the titanium substrate for 1h at 80 ℃ by using 10% NaOH solution to remove oil; finally, the titanium substrate is acid etched by 10% oxalic acid at 95 ℃ for 2 hours, washed and stored in ethanol.
Further, the soluble cerium salt includes at least one of cerium chloride, cerium nitrate, and cerium acetate.
Preferably, the concentration of the soluble cerium salt is 0.1 to 1.0mol/L; the cathode current density of the electrolysis is 0.1-10 mA/cm -2 The electrolysis time is 1 s-100 min.
Further, in the step (3), the ferric salt solution is an ammonium ferrous sulfate solution, the concentration of the ammonium ferrous sulfate solution is 0.005-0.1 mol/L, and the ion exchange time is 10-150 min.
Further, the saidThe step (4) also comprises the preparation process of precursor coating liquid: will H 2 IrCl 6 ·6H 2 O is dissolved in an alcohol solvent to obtain an Ir-containing precursor coating solution, the H 2 IrCl 6 ·6H 2 The concentration of O is 0.05-0.4 mol/L.
Further, the alcohol solvent includes at least one of ethanol, n-butanol, and isopropanol.
Preferably, in the step (4), the drying temperature is 90-120 ℃ and the drying time is 10-30 min.
Preferably, in the step (5), the sintering temperature is 400-600 ℃, and the heat preservation time is 1-3 hours.
A titanium electrode with a metal oxide coating is obtained by adopting the preparation method.
Compared with the prior art, the invention has the following beneficial effects: the preparation method of the application abandons complex multielement and expensive inert components (such as carbon black, silicon dioxide and tin dioxide) in the existing coating material, and creatively introduces cheap CeO 2 And Fe (Fe) 2 O 3 To replace the prior inert components, and preparing the catalyst containing IrO by an electrodeposition-ion exchange-sintering method 2 、CeO 2 、α-Fe 2 O 3 CeO doped with crystalline phase and Fe 2 Active component of new crystal phase, thereby obtaining high catalytic activity IrO 2 ·CeO 2 ·Fe 2 O 3 Titanium electrode and form Fe doped CeO 2 The new crystal phase is tested to show that the catalyst contains Fe doped CeO 2 IrO of new crystalline phase 2 ·CeO 2 ·Fe 2 O 3 The oxygen evolution catalytic activity of the coated titanium electrode can be greatly improved, compared with the traditional IrO 2 ·Ta 2 O 5 The coated titanium electrode has obvious advantages in oxygen evolution catalytic activity. Therefore, the preparation method and the obtained metal oxide coated titanium electrode can effectively reduce the content of noble metal, and meanwhile, the preparation method is simple to operate, low in product cost, considerable in economic benefit and capable of meeting the large-scale commercial application requirements.
Drawings
The invention is described in detail below with reference to examples and figures, wherein:
fig. 1 is an X-ray diffraction chart of the crystals in examples 1 to 3 and comparative example 1;
FIG. 2 is a graph showing the results of the electrochemical oxygen evolution reactivity test in examples 1 to 3 and comparative examples 1 and 2.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout, or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The application provides a preparation method of a metal oxide coating titanium electrode and the metal oxide coating titanium electrode obtained by the preparation method, and in general, the preparation method mainly comprises the following steps:
1) Pretreating a titanium substrate to obtain a titanium substrate with a rough surface;
2) Placing the titanium substrate obtained in the step (1) as a cathode in a soluble cerium salt solution, and depositing a layer of Ce (OH) on the surface of the titanium substrate after electrolysis 3 Obtaining Ce (OH) 3 A Ti electrode;
3) Ce (OH) obtained in the step (2) 3 Placing Ti electrode in ferric salt solution, and performing ion exchange to obtain Fe doped Ce (OH) 3 A Ti electrode;
4) Coating the Fe doped Ce (OH) obtained in the step (3) with an Ir-containing precursor coating solution 3 The Ti electrode surface is dried;
5) Sintering the titanium substrate coated with the precursor coating liquid in the step (4) at high temperature to finally form IrO 2 ·CeO 2 ·Fe 2 O 3 And coating a titanium electrode.
IrO can be obtained by the above preparation method 2 ·CeO 2 ·Fe 2 O 3 Coated titanium electrode, formableCeO doped with Fe 2 The new crystal phase, through test, shows that the Fe doped CeO 2 The new crystal phase can promote IrO 2 ·CeO 2 ·Fe 2 O 3 Oxygen evolution catalytic activity of coated titanium electrodes, relative to conventional IrO 2 ·Ta 2 O 5 The coated titanium electrode has obvious advantages in oxygen evolution catalytic activity, and the preparation method of the application abandons complex multielement and high-cost inert components (such as carbon black, silicon dioxide and tin dioxide) in the existing coating material, and creatively introduces cheap CeO 2 And Fe (Fe) 2 O 3 Instead of the prior inert components, irO-containing materials are prepared by a simple electrodeposition-ion exchange-sintering method 2 、CeO 2 、α-Fe 2 O 3 CeO doped with crystalline phase and Fe 2 Active component of new crystal phase, thereby obtaining high catalytic activity IrO 2 ·CeO 2 ·Fe 2 O 3 The titanium electrode can effectively reduce the content of noble metal, and the preparation method has the advantages of simple operation, low product cost, considerable economic benefit and capability of meeting the large-scale commercial application requirements.
The following provides specific examples of the preparation process.
Example 1:
step (1): firstly, carrying out sand blasting grinding and deionized water cleaning on a titanium substrate; secondly, ultrasonically cleaning the titanium substrate by using acetone, and then cleaning the titanium substrate for 1h at 80 ℃ by using 10% NaOH solution to remove oil; finally, soaking the titanium substrate for 2 hours at 95 ℃ with 10% oxalic acid, and cleaning the titanium substrate and then placing the cleaned titanium substrate in ethanol for preservation;
step (2): the titanium substrate treated in step (1) of example 1 was placed as a cathode in 0.1mol/L CeCl 3 In the solution, the current density at the cathode was 0.1mA/cm -2 Is electrolyzed for 50min under the condition of (1) and a layer of Ce (OH) is deposited on the surface of the titanium substrate 3 Obtaining Ce (OH) 3 A Ti electrode;
step (3): ce (OH) obtained in step (2) of example 1 3 The Ti electrode was placed at 0.005mol/L Fe (NH) 4 ) 2 ·(SO 4 ) 2 Ion exchange is carried out in the solution150min to obtain Fe doped Ce (OH) 3 A Ti electrode;
step (4): preparing an Ir-containing precursor coating solution, and coating the Ir-containing precursor coating solution on the Fe-doped Ce (OH) obtained in the step (3) of example 1 3 Drying the Ti electrode surface in an oven at 90 ℃ for 30min, and repeating the brushing-drying step until the precursor coating liquid is used up;
step (5): placing the titanium electrode coated with the precursor in the step (4) of the example 1 in a muffle furnace, sintering for 3 hours at 450 ℃ to ensure that the organic matters in the precursor are completely oxidized and decomposed, and Ce, fe and Ir form corresponding metal oxides, thereby obtaining IrO 2 ·CeO 2 ·Fe 2 O 3 And coating a titanium electrode.
Wherein, the method for preparing the precursor coating liquid containing Ir in the step (4) of the embodiment 1 comprises the following steps: will H 2 IrCl 6 ·6H 2 O is dissolved in ethanol solvent, so as to obtain 0.05mol/L Ir precursor coating liquid.
Example 2
Step (1): firstly, carrying out sand blasting grinding and deionized water cleaning on a titanium substrate; secondly, ultrasonically cleaning the titanium substrate by using acetone, and then cleaning the titanium substrate for 1h at 80 ℃ by using 10% NaOH solution to remove oil; finally, soaking the titanium substrate for 2 hours at 95 ℃ with 10% oxalic acid, and cleaning the titanium substrate and then placing the cleaned titanium substrate in ethanol for preservation;
step (2): the titanium substrate treated in step (1) of example 2 was placed as a cathode at 0.4mol/L CeCl 3 In the solution, the current density at the cathode was 1.0mA/cm -2 Is electrolyzed for 20min under the condition of (1) and a layer of Ce (OH) is deposited on the surface of the titanium substrate 3 Obtaining Ce (OH) 3 A Ti electrode;
step (3): ce (OH) obtained in step (2) of example 2 3 The Ti electrode was placed at 0.02mol/L Fe (NH) 4 ) 2 ·(SO 4 ) 2 Ion exchange is carried out for 120min in the solution to obtain Fe doped Ce (OH) 3 A Ti electrode;
step (4): preparing an Ir-containing precursor coating solution, and coating the Ir precursor coating solution on the Fe-doped Ce (OH) obtained in the step (3) of the example 2 3 Ti electrode surfaceAnd placing the mixture in an oven to dry for 20min at 100 ℃; repeating the brushing-drying step until the coating liquid is used up;
step (5): placing the titanium electrode coated with the precursor in the step (4) of the example 2 in a muffle furnace, sintering for 2h at 500 ℃ to ensure that the organic matters in the precursor are completely oxidized and decomposed, and forming corresponding metal oxides by Ce, fe and Ir to obtain IrO 2 ·CeO 2 ·Fe 2 O 3 And coating a titanium electrode.
Wherein, the method for preparing the precursor coating liquid containing Ir in the step (4) of the embodiment 2 comprises the following steps: will H 2 IrCl 6 ·6H 2 O is dissolved in ethanol solvent to obtain 0.2mol/L Ir precursor coating liquid.
Example 3
Step (1): firstly, carrying out sand blasting grinding and deionized water cleaning on a titanium substrate; secondly, ultrasonically cleaning the titanium substrate by using acetone, and then cleaning the titanium substrate for 1h at 80 ℃ by using 10% NaOH solution to remove oil; finally, soaking the titanium substrate for 2 hours at 95 ℃ with 10% oxalic acid, and cleaning the titanium substrate and then placing the cleaned titanium substrate in ethanol for preservation;
step (2): the titanium substrate treated in step (1) of example 3 was placed as a cathode at 1.0mol/L CeCl 3 In the solution, the current density at the cathode was 10mA/cm -2 Is electrolyzed for 1min under the condition of (1) and a layer of Ce (OH) is deposited on the surface of the titanium substrate 3 Obtaining Ce (OH) 3 A Ti electrode;
step (3): ce (OH) obtained in step (2) of example 3 3 The Ti electrode was placed at 0.1mol/L Fe (NH) 4 ) 2 ·(SO 4 ) 2 Ion exchange is carried out for 10min in the solution to obtain Fe doped Ce (OH) 3 A Ti electrode;
step (4): preparing an Ir-containing precursor coating solution, and coating the Ir precursor coating solution on the Fe-doped Ce (OH) obtained in the step (3) of the example 3 3 The Ti electrode surface is dried for 10min at 120 ℃ in an oven; repeating the brushing-drying step until the coating liquid is used up;
step (5): placing the titanium electrode coated with the precursor in the step (4) of the embodiment 3 in a muffle furnace, and sintering for 1h at 600 ℃ to ensure that the organic matters in the precursor are completely oxidizedForming corresponding metal oxide by dissolving Ce, fe and Ir to obtain IrO 2 ·CeO 2 ·Fe 2 O 3 And coating a titanium electrode.
Wherein the method for preparing the precursor coating liquid containing Ir in the step (4) of the embodiment 3 comprises the following steps: will H 2 IrCl 6 ·6H 2 O is dissolved in ethanol solvent to obtain 0.3mol/L Ir precursor coating liquid.
It should be noted that the following reagents and conditions parameters are all preferred ranges:
the pretreatment method for the titanium substrate in the step (1) in the above embodiments 1 to 3 is only one relatively preferred pretreatment method, and other similar or equivalent pretreatment methods can be applied in the step (1), for example: mechanical polishing, which uses mechanical methods (e.g., grinding, polishing) to remove oxide layers, impurities, and roughness from the titanium surface to smooth and clean the surface. This aids in a strong bond between the coating and the titanium substrate; ultrasonic cleaning, namely soaking a titanium substrate in a proper solvent (such as ethanol), and cleaning by ultrasonic waves, wherein the ultrasonic waves can effectively remove dirt and residues on the surface, so that the surface cleanliness of the titanium substrate is improved; acid washing, namely acid washing is carried out on the titanium substrate by using an acid solution (such as nitric acid and hydrochloric acid) to remove oxide and other impurities on the surface. This helps to increase the surface purity and activity of the titanium substrate; anodic oxidation, by applying voltage in the electrolyte, forms an oxide layer on the surface of the titanium substrate, the oxide layer can increase the roughness of the surface, provide more catalytic active centers and improve the bonding force between the coating and the titanium substrate; the titanium substrate is activated by soaking the titanium substrate in concentrated hydrochloric acid and then in hydrogen peroxide or other oxidizing agents to activate the surface of the titanium substrate and increase its surface energy and catalytic activity.
Preferably, the soluble cerium salt may be selected for suitability in specific cases, the soluble cerium salt including at least one of cerium chloride, cerium nitrate and cerium acetate, the concentration of the soluble cerium salt being 0.1 to 1.0mol/L; the cathode current density of the electrolysis is 0.1-10 mA/cm -2 The electrolysis time is 1 s-100 min.
Preferably, the ferric salt solution is ferrous ammonium sulfate solution, the concentration of the ferrous ammonium sulfate solution is 0.005-0.1 mol/L, and the ion exchange time is 10-150 min.
Preferably H 2 IrCl 6 ·6H 2 O is dissolved in ethanol solvent to obtain Ir precursor coating liquid with the concentration of 0.05-0.4 mol/L.
Preferably, the alcohol solvent includes at least one of ethanol, n-butanol and isopropanol.
Preferably, the drying temperature in the step (4) is 90-120 ℃ and the drying time is 10-30 min, the drying temperature is lower than 90 ℃ so that the volatilization speed of the alcohol solvent is slow, the process efficiency is low, and the drying temperature is higher than 120 ℃ so that the energy consumption is high; in the step (5), the sintering temperature is 400-600 ℃, and the heat preservation time is 1-3 h.
Comparative example 1
IrO was obtained by thermal decomposition using the same reagents and parameters as in example 2 2 ·CeO 2 ·Fe 2 O 3 Coated titanium electrode the following is illustrative of one of the alternative thermal decomposition methods for preparing titanium electrodes, and the particular thermal decomposition method employed is not intended to be a protective example:
the first step: preparing a titanium electrode, firstly obtaining a clean titanium substrate electrode, and firstly, carrying out sand blasting grinding and deionized water cleaning on a titanium substrate; secondly, ultrasonically cleaning the titanium substrate by using acetone, and then cleaning the titanium substrate for 1h at 80 ℃ by using 10% NaOH solution to remove oil; finally, the titanium substrate is acid etched by soaking 10% oxalic acid at 95 ℃ for 2 hours, and the titanium substrate is cleaned and then stored in ethanol.
And a second step of: preparing a coating solution, and taking a proper amount of 0.4mol/L CeCl 3 Solution, 0.02mol/L Fe (NH) 4 ) 2 ·(SO 4 ) 2 Solution and proper amount of H 2 IrCl 6 ·6H 2 O is dissolved in ethanol solvent to be prepared into solution with proper concentration.
And a third step of: and (3) coating the solution, immersing the titanium electrode in the coating solution obtained in the second step, ensuring that the titanium electrode is completely immersed, and heating and maintaining the titanium electrode at a proper temperature for a period of time.
Fourth step: thermal decomposition and calcination, heating of titanium electrode andthe solution is subjected to a thermal decomposition reaction in which the compounds in the solution decompose and form a coating on the titanium electrode, followed by a calcination process in which the sample is heated to a higher temperature (e.g., 400-600 degrees celsius) to promote the formation of stable IrO for the coating 2 ·CeO 2 ·Fe 2 O 3 And (3) phase (C).
Fifth step: cooling and cleaning, taking out the titanium electrode after the sample is cooled to room temperature, and cleaning with a solvent (such as ethanol) to ensure that the solution and impurities remained on the surface are removed.
Through the steps, the IrO-containing material can be prepared 2 ·CeO 2 ·Fe 2 O 3 A coated titanium electrode.
Comparative example 2
Traditional IrO 2 ·Ta 2 O 5 The specific preparation method and process of the coated titanium electrode can refer to the prior art, and the description is omitted herein.
IrO finally obtained in each of the above examples and comparative examples was prepared 2 The base coating titanium electrode is subjected to crystal phase analysis and electrochemical oxygen evolution reaction activity test, and experimental results are shown in fig. 1 and 2 respectively:
comparative example 1 and examples 1 to 3 each contained a single IrO 2 、CeO 2 And alpha-Fe 2 O 3 As can be seen from FIG. 1, ceO in examples 1 to 3 2 Diffraction peaks corresponding to the crystalline phases relative to standard CeO 2 The cards all have a certain degree of offset (diffraction peak corresponding to the broken line in fig. 1), which indicates that the Fe atoms successfully replaced CeO 2 Part of Ce atoms in the crystal phase form Fe doped CeO 2 New crystalline phases. In particular, ceO in example 2 2 The diffraction peak shift degree corresponding to the crystal phase was the greatest, and the peak was relatively high, indicating that the new crystal phase component was relatively large in example 2. In contrast, irO prepared by conventional thermal decomposition methods 2 ·CeO 2 ·Fe 2 O 3 No Fe-doped CeO was found in the coated titanium electrode (comparative example 1) 2 New crystalline phases.
Electrocatalytic activity is one of the main parameters for evaluating the performance of coated titanium electrodes, for acidic electrolytesOxygen evolution overpotential at a current density is typically used to compare the electrocatalytic activity of different metal oxide coated titanium electrodes. As can be seen from FIG. 2, at 0.5MH 2 SO 4 Electrolyte and 50mAcm -2 IrO in example 1, example 2 and example 3 2 ·CeO 2 ·Fe 2 O 3 The oxygen evolution overpotential (352, 326 and 398 mV) of the coated titanium electrode was less than that of comparative example 1 (495 mV), and it was found that Fe-doped CeO was found by the analysis of the crystalline phase composition in FIG. 1 2 The new crystal phase is to promote IrO 2 ·CeO 2 ·Fe 2 O 3 The primary reason for the oxygen evolution catalytic activity of the coated titanium electrode.
In addition, irO in example 1, example 2 and example 3 2 ·CeO 2 ·Fe 2 O 3 Oxygen evolution overpotential of the coated titanium electrode is smaller than that of the traditional IrO 2 ·Ta 2 O 5 Coated titanium electrode (428 mV, comparative example 2), indicating IrO prepared according to the present invention 2 ·CeO 2 ·Fe 2 O 3 Coated titanium electrode relative to conventional IrO 2 ·Ta 2 O 5 The coated titanium electrode has obvious advantages in oxygen evolution catalytic activity.
In summary, the IrO provided by the invention 2 ·CeO 2 ·Fe 2 O 3 The preparation method of the coated titanium electrode can obtain the coated titanium electrode with high catalytic activity. The preparation method is simple to operate, low in product cost and remarkable in industrialization advantage.
The embodiments have been described so as to facilitate a person of ordinary skill in the art in order to understand and apply the present technology, it will be apparent to those skilled in the art that various modifications may be made to these examples and that the general principles described herein may be applied to other embodiments without undue burden. Therefore, the present application is not limited to the above embodiments, and modifications to the following cases should be within the scope of protection of the present application: (1) the technical scheme of the invention is taken as the basis and combined with the new technical scheme implemented by the prior common general knowledge, and the technical effect produced by the new technical scheme is not beyond that of the invention; (2) equivalent replacement of part of the characteristics of the technical scheme of the invention by adopting the known technology produces the technical effect the same as that of the invention; (3) the technical scheme of the invention is taken as a basis for expanding, and the essence of the expanded technical scheme is not beyond the technical scheme of the invention; (4) equivalent transformation made by the content of the specification and the drawings of the invention is directly or indirectly applied to other related technical fields.

Claims (10)

1. The preparation method of the metal oxide coated titanium electrode is characterized by comprising the following steps of:
1) Pretreating a titanium substrate to obtain a titanium substrate with a rough surface;
2) Placing the titanium substrate obtained in the step (1) as a cathode in a soluble cerium salt solution, and depositing a layer of Ce (OH) on the surface of the titanium substrate after electrolysis 3 Obtaining Ce (OH) 3 A Ti electrode;
3) Ce (OH) obtained in the step (2) 3 Placing Ti electrode in ferric salt solution, and performing ion exchange to obtain Fe doped Ce (OH) 3 A Ti electrode;
4) Coating the Fe doped Ce (OH) obtained in the step (3) with an Ir-containing precursor coating solution 3 The Ti electrode surface is dried;
5) Sintering the titanium substrate coated with the precursor coating liquid in the step (4) at a high temperature to form IrO 2 ·CeO 2 ·Fe 2 O 3 And coating a titanium electrode.
2. The method of claim 1, wherein the pretreatment of the titanium substrate in step (1) comprises: firstly, carrying out sand blasting grinding and deionized water cleaning on a titanium substrate; secondly, ultrasonically cleaning the titanium substrate by using acetone, and cleaning the titanium substrate for 1h at 80 ℃ by using 10% NaOH solution to remove oil; finally, the titanium substrate is acid etched by 10% oxalic acid at 95 ℃ for 2 hours, washed and stored in ethanol.
3. The method of preparing according to claim 1, wherein the soluble cerium salt comprises at least one of cerium chloride, cerium nitrate, and cerium acetate.
4. The preparation method according to claim 3, wherein the concentration of the soluble cerium salt is 0.1 to 1.0mol/L; the cathode current density of the electrolysis is 0.1-10 mA/cm -2 The electrolysis time is 1 s-100 min.
5. The method according to claim 1, wherein in the step (3), the iron salt solution is a ferrous ammonium sulfate solution, the concentration of the ferrous ammonium sulfate solution is 0.005-0.1 mol/L, and the ion exchange time is 10-150 min.
6. The method according to claim 1, wherein the step (4) further comprises a preparation process of precursor coating liquid: will H 2 IrCl 6 ·6H 2 O is dissolved in an alcohol solvent to obtain an Ir-containing precursor coating solution, the H 2 IrCl 6 ·6H 2 The concentration of O is 0.05-0.4 mol/L.
7. The method of claim 6, wherein the alcohol solvent comprises at least one of ethanol, n-butanol, and isopropanol.
8. The method according to claim 1, wherein in the step (4), the drying temperature is 90 to 120 ℃ and the drying time is 10 to 30 minutes.
9. The method according to claim 1, wherein in the step (5), the sintering temperature is 400 to 600 ℃ and the holding time is 1 to 3 hours.
10. A metal oxide coated titanium electrode obtainable by the process of any one of claims 1 to 8.
CN202311366623.6A 2023-10-20 2023-10-20 Metal oxide coated titanium electrode and preparation method thereof Pending CN117512678A (en)

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