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Supported iridium-based catalyst thin layer and preparation method thereof

A catalyst and thin-layer technology, which is applied in the field of iridium-based catalyst preparation, can solve the problems of disappearance of array morphology and inability to meet the requirements of ordered electrode structure, etc., and achieve the improvement of mass specific activity, mass specific activity and dispersion Effect

Pending Publication Date: 2022-05-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Beihang University team patent (CN101974770B) uses reduction current deposition to prepare a flat and dense iridium layer on the surface of a metal plate, with a thi

Method used

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  • Supported iridium-based catalyst thin layer and preparation method thereof
  • Supported iridium-based catalyst thin layer and preparation method thereof
  • Supported iridium-based catalyst thin layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Preparation of ordered WO by hydrothermal method x carrier

[0042] To prepare a tungstic acid solution, first weigh 1.25 g of tungstic acid, add 10 ml of 30 wt% hydrogen peroxide, add water to dissolve 30 ml of water, and stir at 85 °C for 30 min to form a milky white tungstic acid solution, which is diluted with water so that the concentration of tungstic acid is 0.05molL -1 .

[0043]To prepare a solution for hydrothermal reaction: 0.056 g of thiourea and 0.064 g of maleic acid were weighed in turn, 3.2 mL of 3M hydrochloric acid solution was weighed, 4.8 mL of water and 30.4 mL of acetonitrile were added as solvents, and the mixture was stirred for 30 min. The prepared tungstic acid solution was added, and the stirring was continued for 60 min to complete the preparation of the reaction solution.

[0044] Cut the pure tungsten sheet into 2.5*5.0cm 2 sonicated with ethanol and deionized water for 20 min in turn, then placed in 80°C, 25% hydrochloric acid solu...

Embodiment 2

[0055] (1) Prepare ordered WO according to the hydrothermal method of Example 1 x carrier

[0056] (2) Preparation of iridium-based catalyst thin layer

[0057] Cyclic voltammetry current, the potential scanning range is -0.4 ~ 0.05V vs SCE, the scanning speed is 100mVs-1, and the number of scanning is 100 times. Other processes are the same as those shown in Example 1. After scanning, take out the electrode, wash it in deionized water for 2 to 3 times, and dry it;

[0058] Heat treatment: After the deposition, the electrode sheet loaded with the iridium-based catalyst was annealed at 400 °C in an argon atmosphere for 2 h, and the heating rate was 2 °C min -1 . An iridium-loaded WOx array electrode was obtained.

[0059] Ir@WO was prepared in this example x Array electrode structures such as Figure 8 and 9 As shown, the iridium-based catalyst was distributed as a spherical monolayer on the surface of the array, and the diameter of the catalyst particles was about 20 n...

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Abstract

The invention relates to a supported iridium-based catalyst thin layer and a preparation method thereof. The supported iridium-based catalyst thin layer is an electrochemical deposition method for obtaining an iridium-based catalyst through adsorption hydrogen reduction. According to the method, the iridium-based catalyst can be uniformly loaded on the surface of the carrier, the thickness of the formed thin layer is about 10-500nm, the preparation effect is stable, the repeatability is high, and the method has obvious advantages in the aspects of controlling the loading capacity of the catalyst and keeping the morphology of the carrier. The iridium-based catalyst prepared by the method is continuously loaded on the surface of an array carrier in a nano spherical shape, and the loaded array can keep the ordered morphology before being loaded. The method is widely applied to the preparation of the PEM electrolyzed water ordered electrode.

Description

technical field [0001] The invention belongs to the field of iridium-based catalyst preparation, in particular to a proton exchange membrane water electrolysis (PEMWE) ordered electrode and its preparation and application. technical background [0002] The cost of PEM water electrolysis has limited the progress of its commercial application. Due to the scarcity of iridium and ruthenium elements on earth, the iridium loading of membrane electrodes for PEM water electrolyzers is as high as 2 to 3 mg cm -2 Therefore, reducing its usage in membrane electrodes to improve the operating current density of membrane electrodes has become a top priority. At present, non-precious metal doping is a common strategy to improve the mass specific activity of noble metal catalysts. However, in addition to the catalyst activity to improve the performance of membrane electrodes, the effect of electrode structure on performance cannot be ignored. The microstructure of traditional powder catal...

Claims

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Application Information

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IPC IPC(8): C25B11/067C25B11/052C25B1/04B82Y40/00B82Y30/00
CPCB01J35/023B01J23/6527B01J35/0033B01J37/348C25B1/04
Inventor 俞红梅姜广姚德伟迟军邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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