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

A core-shell structure, catalyst technology, applied in the direction of electrode, electrode shape/type, electrolysis process, etc., can solve the problems of poor durability and less investigation of catalyst electrochemical stability.

Active Publication Date: 2021-09-07
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 containing catalyst
  • Core-shell structure catalyst, preparation method thereof and membrane electrode containing catalyst
  • Core-shell structure catalyst, preparation method thereof and membrane electrode containing 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 (35wt% iridium) 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, and 2g of Ir...

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 core-shell structure catalyst, a preparation method of the core-shell structure catalyst and a membrane electrode containing the core-shell structure catalyst. The core-shell structure catalyst can be used for PEM hydrogen production but is not limited to the PEM hydrogen production. The core-shell structure catalyst is characterized in that IrxMyOz is used as an inner core, and the inner core is in a crystalline state; IrxMyOz is a shell layer, and the shell layer is of a dispersed amorphous structure; wherein M is selected from at least one of Pt, Pd, Au, Sn, Sb, Ti, Mn, Ru, Ni, W, Mo, Nb, Zr, Zn, Ta and Sr, in the formula, x / (x + y + z) is 31.6%-33.3%, and y / (x + y + z) is 0-1.6%. According to the core-shell structure catalyst, an outer shell layer structure is constructed on the surface of the noble metal oxide core through a deposition method that ultrasonic treatment cooperates with pH value control, and the core-shell structure catalyst has appropriate outer layer thickness and a synergistic effect of the inner layer and the outer layer, so the catalyst has 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 Applications(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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