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Core-shell structure catalyst, preparation method thereof, and membrane electrode comprising the catalyst

A core-shell structure and catalyst technology, applied in the field of membrane electrodes containing the catalyst, can solve the problems of poor durability, less investigation of the electrochemical stability of the catalyst, etc., to improve the quality activity, improve the intrinsic reaction activity, and inhibit the electrochemical The effect of corrosion

Active Publication Date: 2021-11-09
国家电投集团氢能科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The core-shell structure catalysts mentioned in the literature usually only provide electrochemical activity, but there are few investigations on the electrochemical stability of the catalyst, especially when the catalyst is used as the anode catalytic layer and applied to the PEM electrochemical device, under the condition of low noble metal loading and high voltage The following literature reports that core-shell structure catalysts have poor durability

Method used

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  • Core-shell structure catalyst, preparation method thereof, and membrane electrode comprising the catalyst
  • Core-shell structure catalyst, preparation method thereof, and membrane electrode comprising the catalyst
  • Core-shell structure catalyst, preparation method thereof, and membrane electrode comprising the catalyst

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preparation example Construction

[0042] The embodiment of the present invention also provides a preparation method of a core-shell structure catalyst, which includes the following steps:

[0043] a. Add NaNO to the aqueous solution containing Ir ions 3 and NH 4 HCO 3 , stirred, evaporated, and then roasted to obtain IrO 2 kernel;

[0044] Preferably, the concentration of Ir ions in the aqueous solution containing Ir ions is 0.01-0.05mol / L, and the Ir ions: NaNO 3 :NH 4 HCO 3 The molar ratio is 1:20-40:1-20, the temperature of the roasting is 400-450°C, and the heating rate is 1-10°C / min;

[0045] B, the IrO that described step a makes 2 The inner core is added to the alkali solution containing Ir ions, stirred, and reacted;

[0046] Preferably, in the alkaline solution containing Ir ions, the concentration of Ir ions is not more than 5mmol / L, the alkaline solution is KOH or NaOH, adding IrO 2 After the core, in solution Ir:IrO 2 The molar ratio is 0.3-0.5, the reaction temperature is 60-90°C, and th...

Embodiment 1

[0059] (1) Take 4.5g H 2 IrCl 6 The solution (containing iridium 35wt%) was dissolved in 300ml of high-purity water, heated and stirred at 80 degrees for 30min, the Ir ion concentration in the solution was 0.027mol / L, and then 20gNaNO 3 and 3.25gNH 4 HCO 3 , namely Ir ion: NaNO 3 :NH 4 HCO 3 The molar ratio is 1:29:5. After stirring for 1 h, the solution is evaporated to dryness to obtain a powder sample, which is roasted at 450 °C for 1 h at a heating rate of 5 °C / min. The powder sample is ground, washed, centrifuged and dried at 90 °C. Dry for 12h to get IrO 2 kernel;

[0060] (2) take 2gH 2 IrCl 6 The solution (containing iridium 35wt%) was dissolved in 1000ml of 0.5mol / L NaOH alkali solution, the temperature was controlled at 80 °C, the pH was controlled at 13, the Ir ion concentration in the solution was 0.004mmol / L, mechanically stirred for 30min, and ultrasonic treatment, the ultrasonic power is 480W, and an alkaline solution containing Ir ions is obtained, an...

Embodiment 2

[0069] The method is the same as that of Example 1, except that step (3) is to add 0.5 mol / L HCl solution dropwise to the reaction solution in step (2).

[0070] The catalyst inner core IrO that this embodiment makes 2 The specific surface area is 219m 2 / g, the grain size is 3.2-3.3nm; the shell layer thickness is 1.3-1.4nm.

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Abstract

The invention discloses a catalyst with a core-shell structure, a preparation method thereof and a membrane electrode containing the catalyst. The catalyst of the invention can be used for PEM hydrogen production but is not limited thereto. The core-shell structure catalyst of the present invention comprises: Ir x m y o z is the core, the core is crystalline; Ir x m y o z is the shell layer, and the shell layer is a dispersed amorphous structure; wherein, M is selected from Pt, Pd, Au, Sn, Sb, Ti, Mn, Ru, Ni, W, Mo, Nb, Zr, Zn, Ta, Sr elements At least one of them, where x / (x+y+z) is 31.6%-33.3%, and y / (x+y+z) is 0-1.6%. The core-shell structure catalyst of the present invention constructs a shell layer structure on the surface of the noble metal oxide core through the deposition method of ultrasonic treatment to control the pH value, and has a suitable outer layer thickness, and the inner and outer layers work together to make the catalyst have high activity and high stability. .

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by PEM electrolysis of water, and in particular relates to a catalyst with a core-shell structure, in particular to a method for preparing the catalyst with a core-shell structure, and further to a membrane electrode containing the catalyst. Background technique [0002] With the development of human society and technology, there is an urgent need to change from traditional fossil energy to renewable energy. Hydrogen energy has attracted widespread attention due to its high calorific value, clean and low-carbon advantages. PEM (polymer electrolytemembrane) electrolyzed water hydrogen production technology can well adapt to intermittent renewable energy sources (wind energy, solar energy, etc.) and can generate high-purity, high-pressure hydrogen for long-distance transportation. The oxygen evolution reaction (OER (oxygen evolution reaction)) involving four electron transfers in the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04C25B11/02
CPCC25B11/091C25B11/02C25B1/04Y02E60/36
Inventor 李晨旭梅武赵宇峰孙流莉
Owner 国家电投集团氢能科技发展有限公司
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