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Hydrogen electrode of solid oxide electrolytic cell, preparation method of hydrogen electrode, and solid oxide electrolytic cell

A solid oxide, electrolytic cell technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of easy agglomeration of nano-scale catalysts, poor uniformity and controllability, and reduced three-phase interface.

Active Publication Date: 2020-11-10
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the application discloses a hydrogen electrode for a solid oxide electrolytic cell and a preparation method thereof, which can effectively solve the poor uniformity and controllability of the pore structure and porosity of the existing Ni-YSZ porous cermet, making Nanoscale catalysts are easy to agglomerate under high temperature and long-term operation, resulting in the reduction of the three-phase interface and the technical problems of the stability of the hydrogen electrode.

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  • Hydrogen electrode of solid oxide electrolytic cell, preparation method of hydrogen electrode, and solid oxide electrolytic cell
  • Hydrogen electrode of solid oxide electrolytic cell, preparation method of hydrogen electrode, and solid oxide electrolytic cell
  • Hydrogen electrode of solid oxide electrolytic cell, preparation method of hydrogen electrode, and solid oxide electrolytic cell

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preparation example Construction

[0051] The preparation method of the solid oxide electrolytic cell of the embodiment of the present application comprises the following steps:

[0052] 1) Preparation of SOEC hydrogen electrode support body containing NiO and YSZ (yttria-stabilized zirconia): Mix NiO and YSZ powder with the first pore-forming agent ball mill for 6-12 hours, take an appropriate amount of mixed powder and put it into the mold , warm-pressed, with a thickness of 100-1000 μm, and then pre-sintered at 1000-1500 ° C for 2 hours, and the hydrogen electrode support is also used as the support of the entire battery;

[0053] 2) The hydrogen electrode of the solid oxide electrolytic cell of the present application is the hydrogen electrode functional layer, and its preparation method is: uniformly mix NiO, YSZ powder, the second pore-forming agent and a solvent, and coat it on the surface of the hydrogen electrode support. The surface, with a thickness of 5-25 μm, is fully dried in the air at 100-150 °C...

Embodiment 1

[0066] This embodiment provides a solid oxide electrolytic cell, the specific steps are as follows:

[0067] 1) First prepare the SOEC hydrogen electrode support containing NiO and yttria-stabilized zirconia (hereinafter referred to as YSZ): uniformly mix NiO and YSZ powder with graphite pore-forming agent at a mass ratio of 1:1:0.2 for 10 h to obtain The first mixture, take the mixed first mixture and put it into a mold, and warm press molding to obtain a square sheet-shaped support with a side length of 7 cm and a thickness of 300 μm, and then pre-sinter at 1200 ° C for 2 hours to obtain a hydrogen electrode support. ; Wherein, the hydrogen electrode support body also serves as the support body of the whole solid oxide electrolytic cell;

[0068] 2) Preparation of hydrogen electrode functional layer: Mix NiO and YSZ powder, the mass ratio of NiO and YSZ powder is 2:1, the particle size of YSZ powder is 60-100nm, and ultrasonically disperse in isopropanol to obtain the first ...

Embodiment 2

[0087] In this embodiment, the scanning electron microscope inspection and performance inspection are carried out on the sample 1, the sample 2 and the sample 3 prepared in the embodiment 1 and the comparative examples 1-2. Table 1 shows the structural characteristics of the hydrogen electrode functional layer of sample 1, sample 2 and sample 3.

[0088] Table 1

[0089]

[0090]

[0091] 1. Scanning electron microscopy was carried out on the sections of sample 1, sample 2 and sample 3, and the results were as follows: Figure 1~4 as shown, figure 1 The cross-sectional SEM picture of sample 3 provided for the embodiment of the present application; wherein, the hydrogen electrode functional layer area is in the frame; figure 2 The cross-sectional SEM picture of sample 1 provided for the embodiment of the present application; wherein, the hydrogen electrode functional layer area is in the frame; image 3 The cross-sectional SEM picture of sample 2 provided for the embo...

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Abstract

The invention belongs to the technical field of solid oxide electrolytic cells, and particularly relates to a hydrogen electrode of a solid oxide electrolytic cell, a preparation method of the hydrogen electrode, and the solid oxide electrolytic cell. The preparation method comprises the following steps: step 1, mixing NiO, yttria-stabilized zirconia, a second pore-forming agent and a solvent to obtain a second mixture, arranging the second mixture on the surface of a hydrogen electrode support body, conducting drying, and performing presintering to obtain a pre-hydrogen electrode, wherein a mass ratio of NiO to yttria-stabilized zirconia is (0.6-2.3): 1; and step 2, arranging nanoparticles on the pre-hydrogen electrode, and conducting sintering to obtain the hydrogen electrode of the solid oxide electrolytic cell. The hydrogen electrode of the solid oxide electrolytic cell and the preparation method of the hydrogen electrode in the invention can effectively solve the technical problems of poor uniformity and controllability of a pore structure and porosity of existing Ni-YSZ porous metal ceramic.

Description

technical field [0001] The application belongs to the technical field of solid oxide electrolytic cells, and in particular relates to a hydrogen electrode of a solid oxide electrolytic cell, a preparation method thereof, and a solid oxide electrolytic cell. Background technique [0002] The solid oxide electrolytic cell (hereinafter referred to as SOEC) is a solid oxide fuel cell that operates in reverse, through the electrolysis of H by applied voltage and high temperature 2 O, producing H 2 and O 2 , to convert electrical and thermal energy into chemical energy. [0003] Water vapor decomposes to produce H 2 The reaction occurs on the hydrogen electrode. As a catalyst, the hydrogen electrode needs to speed up the reaction rate, reduce the overpotential, and provide channels for electron and ion transmission. Therefore, the hydrogen electrode material should meet the following requirements: stable structure and components under high temperature and high humidity conditi...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/03C25B11/06
CPCC25B1/04Y02E60/36
Inventor 胡帆杨波黄旭锐潘军徐钦张行何彬彬于丰源
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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