Method for preparing hydrogen electrode composite powder of solid oxide electrolyzer

A technology of solid oxide and composite powder, which is applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems that the quality of NiO and YSZ is not easy to be accurately controlled, the particle size distribution of precipitated particles is wide, and the speed of precipitation formation is fast. Accurate metering ratio, good adhesion and strong catalytic activity

Inactive Publication Date: 2011-02-16
TSINGHUA UNIV
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Problems solved by technology

However, in order to ensure that the particles of NiO are fine in this invention, the deposition reaction of nickel needs to be carried out at a higher degree of supersaturation, and when the pH value of the solution is too high, ammonia water will complex with nickel ions to produce Ni(NH 3 ) 6 2+ , so that the precipitated Ni(OH) 2 Dissolution reduces the yield of N

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  • Method for preparing hydrogen electrode composite powder of solid oxide electrolyzer
  • Method for preparing hydrogen electrode composite powder of solid oxide electrolyzer
  • Method for preparing hydrogen electrode composite powder of solid oxide electrolyzer

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[0018] The present invention proposes a method for preparing a hydrogen electrode composite powder of a solid oxide electrolytic cell. In the method, YSZ powder is used as the core of the composite powder, NiO is used as a coating layer, and urea is used as a precipitant and a combustion aid in the preparation process. NiO was deposited on YSZ particles through two-step reactions of uniform precipitation and low-temperature self-combustion. The specific steps are as follows:

[0019] (1) Prepare 0.2~1.0mol / L nickel nitrate solution, then add required amount of urea and YSZ powder to the nickel nitrate solution, wherein the molar ratio of urea and nickel nitrate is 1.6:1~4:1, the mass of YSZ The ratio of the theoretical mass to the generated NiO is 0.8:1 to 2:1, and the prepared mixture is ultrasonically treated for 5 to 30 minutes;

[0020] (2) React for 1 to 10 hours in a water bath at 80 to 100°C under rapid stirring conditions to hydrolyze part of the urea, precipitate nick...

Example Embodiment

[0025] Example 1:

[0026] Ni(NO 3 ) 2 ·6H 2 O is dissolved in deionized water and is mixed with 0.5mol / L nickel nitrate solution, then adds required amount of urea and YSZ powder in the nickel nitrate solution, wherein the mol ratio of urea and nickel nitrate is 2: 1, the quality of YSZ and The ratio of the theoretical mass of the generated NiO is 1:1, and the prepared mixture is ultrasonically treated for 15 minutes to open the agglomeration between the YSZ powder particles and make them uniformly dispersed in the solution, as Ni(OH) 2 Precipitated core. Under the conditions of 90° C. water bath and rapid stirring, react for 4 hours to hydrolyze a part of urea, and precipitate nickel ions in the solution on the YSZ particles. Then transfer the resulting mixture to a ceramic round evaporating dish, and stir continuously while heating and evaporating until the suspension becomes a jelly, and continue heating until combustion occurs to obtain the primary powder of NiO-YSZ, ...

Example Embodiment

[0028] Example 2: Performance of Ni-YSZ / YSZ / YSZ-LSM electrolytic cell

[0029]The hydrogen electrode of Ni-YSZ / YSZ / YSZ-LSM electrolytic cell was prepared by dry pressing method. The diameter of the hydrogen electrode sheet is 17mm, the thickness is 0.5mm, and the sheet forming pressure is 250MPa. The mass ratio of NiO and YSZ in the hydrogen electrode is 1:1. In order to make the hydrogen electrode have sufficient pores to conduct gas, NiO and 25% starch of the total mass of YSZ were added as pore-forming agents. YSZ electrolyte and YSZ-LSM oxygen electrode were prepared by screen printing method, and the mass ratio of powder and organic binder in the screen printing paste was 1:2. The organic binder is formed by mixing 5wt% ethyl cellulose and 95wt% terpineol. The sintering temperature of the YSZ electrolyte is 1400 °C and the thickness is 15 μm. The calcination temperature of YSZ-LSM oxygen electrode is 1150℃, and the thickness is 50μm. image 3 For the prepared Ni-YSZ / ...

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Abstract

The invention relates to a method for preparing hydrogen electrode composite powder of a solid oxide electrolyzer, belonging to the field of high-temperature steam electrolysis hydrogen preparation and solid oxide electrolyzer. The preparation method comprises the steps of: with nickel nitrate, YSZ (Yttria Stabilized Zirconia) powder and urea as raw materials, controlling reaction conditions of the addition of the urea, the hydrolysis temperature of the urea and ultrasonic time when the powder is prepared, depositing NiO on a YSZ particle through two-step reactions of homogeneous precipitation and low-temperature spontaneous combustion, and finally preparing the NiO-YSZ hydrogen electrode composite powder of the solid oxide electrolyzer through roasting, wherein the nickel nitrate is used as a nickel source, the YSZ powder is used as a core of a composite powder and the urea is a settling agent in a uniform settling process and a combustion improver in a combustion process. The NiO-YSZ composite powder prepared by using the method has the advantages of good adhering property of two phases of NiO and YSZ, uniform dispersing, accurate stoichiometric proportion, strong catalytic activity, high utilization ratio of the nickel, and the like. The invention is suitable for preparing the NiO-YSZ hydrogen electrode composite powder of the solid oxide electrolyzer.

Description

technical field [0001] The invention belongs to the field of hydrogen production by high-temperature steam electrolysis, and in particular relates to a preparation method of a hydrogen electrode composite powder of a solid oxide electrolytic cell. Background technique [0002] Solid oxide electrolysis cell (Solid oxide electrolysis cell, SOEC) is an energy conversion device that converts electrical energy and thermal energy into chemical energy. the reverse process. The hydrogen production efficiency of using SOEC to electrolyze water vapor at high temperature can be as high as 45-59% (hydrogen production efficiency is defined as the ratio of the energy content of produced hydrogen to the energy used for hydrogen production), which is a potential large-scale hydrogen production method one. However, in order to achieve commercial mass production of this technology, in addition to solving problems such as the coupling between the hydrogen production unit and the reactor, for...

Claims

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Application Information

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IPC IPC(8): C25B1/02C25B11/00
Inventor 梁明德于波文明芬徐景明陈靖
Owner TSINGHUA UNIV
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