Preparation method of solid oxide electrolytic cell NiO-YSZ hydrogen electrode powder

A solid oxide, electrolytic cell technology, applied in battery electrodes, electrodes, electrolysis process, etc., can solve the problems of inaccurate stoichiometric ratio of products, poor bonding of NiO and YSZ, segregation of metal ions, etc., to achieve accurate stoichiometric ratio, Strong catalytic activity and uniform dispersion

Inactive Publication Date: 2009-02-11
TSINGHUA UNIV
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Problems solved by technology

The solid-phase method is to directly mix NiO powder and YSZ powder, which has disadvantages such as poor combination of NiO and YSZ, uneven dispersion, and easy introduction of impurities; liquid-phase methods include coprecipitation method, sol-gel method, buffer solution method, etc., these Although the method can prepare fine NiO-YSZ powder and improve the uniformity of the powder, these methods need to precipitate a variety of metal ions in the same solution, the existence of complex control conditions, inaccurate product stoichiometric ratio and easy occurrence of metal ions. Disadvantages such as ion segregation

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  • Preparation method of solid oxide electrolytic cell NiO-YSZ hydrogen electrode powder
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  • Preparation method of solid oxide electrolytic cell NiO-YSZ hydrogen electrode powder

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[0020] The present invention proposes a novel, high-performance method for preparing NiO-YSZ hydrogen electrode powder for solid oxide electrolytic cells. In this method, nickel nitrate is used as nickel source, ammonia water is used as precipitant, and YSZ powder is used as the core wrapped by precipitation. The in-situ synthesis method efficiently prepares the powder, and the steps are as follows:

[0021] (1) Prepare 0.3-1mol / L nickel nitrate solution with nickel nitrate hexahydrate and deionized water, then add the required amount of YSZ powder to the nickel nitrate solution, and put it in a water bath at 15-50°C, ultrasonic vibration and high-speed stirring conditions , the YSZ particles are uniformly dispersed in the solution, as Ni(OH) 2 For the core of precipitation attachment, the use of a thicker solution is to ensure the supersaturation of the system, so that Ni(OH) 2 The precipitated particles are fine;

[0022] (2) Drop the precipitant to adjust the pH value to ...

Embodiment 1

[0027] Example 1: In situ synthesis of NiO-YSZ powder by ammonia precipitation

[0028] Weigh 72.70g Ni(NO 3 ) 2 ·6H 2 0, be mixed with the nickel nitrate solution of 0.5mol / L with deionized water, then add 12.00g YSZ powder (Tosoh 8YSZ in Japan) in the nickel nitrate solution, after ultrasonic treatment 15 minutes, in 20 ℃ of water baths and the magnetic stirring Ammonia water was added dropwise to the mixture under conditions to adjust the pH value of the solution to 7.6, resulting in a light green precipitate. After the dropwise addition of ammonia water, adjust the temperature of the water bath to 70°C, let the precipitate continue to mature for 40 minutes, then filter, wash, and dry the matured precipitate at 105°C, and finally put it in a muffle furnace and roast at 800°C for 2 hours to obtain 24.66 g NiO-YSZ powder. The mass ratio of NiO and YSZ in the powder is about 1:1.

[0029] figure 1 It is the X-ray diffraction pattern (XRD) of NiO-YSZ powder synthesized in...

Embodiment 2

[0030] Example 2: In-situ synthesis of NiO-YSZ powder by ultrasonic-assisted ammonia precipitation

[0031] Weigh 36.35g Ni(NO 3 ) 2 ·6H 2 O, prepare 0.5mol / L nickel nitrate solution with deionized water, then add 6.00g YSZ powder (Tosoh 8YSZ in Japan) to the nickel nitrate solution, under the stirring condition of 25 ℃ water bath and ultrasonic vibration and 600r / min Ammonia water was added dropwise to the mixture to adjust the pH value of the solution to 8.0, resulting in a light green precipitate. After the addition of ammonia water, adjust the temperature of the water bath to 70°C, let the precipitate continue to mature for 2 hours, then filter, wash, and dry the matured precipitate at 110°C, and finally put it in a muffle furnace and roast at 400°C for 2 hours to obtain 12.86 g NiO-YSZ powder. The mass percent content of NiO in the powder is about 53%. The X-ray diffraction pattern (XRD) and the scanning electron microscope (SEM) photograph of gained NiO-YSZ powder a...

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Abstract

The invention relates to a method for preparing solid oxide electrolytic cell NiO-YSZ hydrogen electrode powder, which belongs to the field of electrolytic hydrogen production with high temperature steam and the field of solid oxide electrolytic cell. The invention uses six hydrate nickel nitride, YSZ (yttira stabilized zirconia) powder, and ammonia as raw materials; an in-situ synthesis is adopted; nickel nitrate is adopted as the nickel source, ammonia as precipitant, and YSZ powder as a precipitation-coated core; by the optimized control of conditions of stirring speed, ultrasonic wave processing, pH value of solution, and dropping speed, etc. Ni(OH)2 is deposited on the YSZ grain and the YSZ is coated; then, after processing of curing, filtering, washing, and drying, etc. NiO is generated on the YSZ powder after roasting; therefore, high-performance solid oxide electrolytic cell NiO-YSZ hydrogen electrode powder is obtained. The method has the advantages of good adhesion between NiO and YSZ grains, even distribution, strong catalysis activity, accurate chemical equivalence ratio, and simple operation, etc.

Description

technical field [0001] The invention belongs to the fields of high-temperature steam electrolytic hydrogen production and solid oxide electrolytic cells, and in particular relates to a method for preparing NiO-YSZ (nickel oxide-yttria stabilized zirconia) hydrogen electrode powder for solid oxide electrolytic cells. Background technique [0002] Solid Oxide Fuel Cells (Solid Oxide Fuel Cells, SOFC) is a device that directly converts the chemical energy of fuel into electrical energy. and other fields are receiving more and more attention. The solid oxide electrolytic cells (Solid Oxide Electrolytic Cells, SOEC) prepared by reverse operation of SOFC can have a hydrogen production efficiency of 45-59% by electrolyzing water vapor at high temperature (hydrogen production efficiency is defined as the energy contained in the produced hydrogen and The ratio of the energy consumed for hydrogen production) is considered to be one of the large-scale hydrogen production methods in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/00B22F1/02C25C7/02H01M4/86
CPCY02E60/50
Inventor 梁明德于波文明芬徐景明陈靖翟玉春
Owner TSINGHUA UNIV
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