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

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

Inactive Publication Date: 2010-12-15
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
  • Preparation method of solid oxide electrolytic cell NiO-YSZ hydrogen electrode powder
  • Preparation method of solid oxide electrolytic cell NiO-YSZ hydrogen electrode powder

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

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

[0022] (2) Add precipitant dropwise, ad...

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 O, prepare 0.5mol / L nickel nitrate solution with deionized water, then add 12.00g YSZ powder (Japan Tosoh 8YSZ) to the nickel nitrate solution, after ultrasonic treatment for 15 minutes, in a 20 ℃ water bath and magnetic stirring Ammonia water was added dropwise to the mixed solution under the conditions, and the pH value of the solution was adjusted to 7.6, resulting in a light green precipitate. After the ammonia water was added dropwise, the temperature of the water bath was adjusted to 70°C, and the precipitation was continued to mature for 40 minutes. After that, the matured precipitate was filtered, washed, dried at 105°C, and finally placed in a muffle furnace for calcination 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) ...

Embodiment 2

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

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

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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 field of high-temperature steam electrolysis for hydrogen production and solid oxide electrolytic cells, and particularly relates to a preparation method for a solid oxide electrolytic cell NiO-YSZ (nickel oxide-yttria-stabilized zirconia) hydrogen electrode powder. Background technique [0002] Solid oxide fuel cell (Solid Oxide Fuel Cells, SOFC) is a device that directly converts the chemical energy of fuel into electrical energy. and other fields are getting more and more attention. Solid Oxide Electrolytic Cells (SOEC) prepared by reverse operation of SOFC, the hydrogen production efficiency of electrolyzed water vapor at high temperature can be as high as 45-59% (hydrogen production efficiency is defined as the energy contained in the produced hydrogen and It is considered to be one of the large-scale hydrogen production methods in the future hydrogen economy era, and it has also become a research hotspot in the curre...

Claims

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Application Information

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Patent Type & Authority Patents(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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