Solid oxide fuel cell, cerium oxide-based isolation layer and preparation method of cerium oxide-based isolation layer

A solid oxide and fuel cell technology, which is applied in the direction of fuel cells, fuel cell parts, metal material coating technology, etc., can solve the problems that do not require catalytic film density, low electrical conductivity, and fuel cell performance degradation, etc. Achieve the effects of improving long-term operation stability, simplifying the preparation process, and saving energy consumption

Active Publication Date: 2021-04-23
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

However, the screen-printed cerium oxide-based separator film is difficult to densify during the sintering process, and the porous structure of the separator cannot completely block the reaction between the electrolyte and the cathode.
In addition, when using this method, the YSZ electrolyte and the GDC isolation layer are easily interdiffused to form a YSZ-GDC solid solution during the preparation process, and its conductivity is two orders of magnitude lower than that of YSZ at the same temperature, resulting in a decrease in fuel cell performance.
[0007] CN104934614A discloses a doped cerium oxide catalytic film with preferred orientation and its preparation and application. The film is prepared by magnetron reactive sputtering, but this patent is mainly aimed at the catalytic layer or porous electrode of solid oxide fuel cells Therefore, the density of the catalytic film is not required, and it is not suitable for the preparation of a dense separator film used to block the migration and reaction of elements in the battery

Method used

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  • Solid oxide fuel cell, cerium oxide-based isolation layer and preparation method of cerium oxide-based isolation layer

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preparation example Construction

[0050] The invention provides a method for preparing a fuel cell ceria-based isolation layer, comprising:

[0051] Step (1): Using a cerium-based alloy as a target, a cerium-based alloy film is prepared on the surface of an electrolyte layer of a solid oxide fuel cell half-cell by a vacuum coating method, the electrolyte layer is a zirconia-based ceramic film, and the cerium-based The alloy film is an alloy film of cerium and a rare earth element whose valence is trivalent;

[0052] Among them, the molar ratio of cerium and rare earth elements in the cerium-based alloy is determined according to the molar ratio of cerium and rare earth elements in the cerium oxide-based isolation layer; vacuum coating methods include magnetron sputtering, ion coating and other coating technologies.

[0053] Step (2): Sintering the half-cell with the cerium-based alloy thin film obtained in step (1) at 900-1100° C. to form a cerium oxide-based isolation layer on the surface of the electrolyte l...

specific Embodiment

[0085] In each embodiment of the present invention, unless otherwise specified, the raw materials are commercially available products. in:

[0086] Solid oxide fuel cell half-cells were purchased from Xuzhou Huaqing Jingkun Energy Co., Ltd.

[0087] Strontium lanthanum cobalt ferrite (LSCF) powder is ball-milled for 48 hours after mixing the nitrates or oxides corresponding to each metal element according to the stoichiometric ratio, taken out and dried, put into a muffle furnace, and calcined at 1050°C for 5 hours to get.

Embodiment 1

[0089] 1.1. Half-cell with NiO-3YSZ|NiO-8YSZ|YSZ structure:

[0090] The half-cell is provided by Xuzhou Huaqing Jingkun Energy Co., Ltd. The material and thickness of each layer are as follows: the anode support layer of the battery is NiO-3YSZ (NiO:3YSZ mass ratio = 1:1) cermet material, the thickness is 400 μm; the anode of the battery The functional layer is NiO-8YSZ (NiO:8YSZ mass ratio=1:1) cermet material with a thickness of 30 μm; the electrolyte of the battery is 8YSZ with a thickness of 15 μm.

[0091] 1.2. Preparation of isolation layer

[0092] see figure 1 , on the surface of the electrolyte layer of the half-cell provided in step 1.1, the GDC isolation layer was prepared using the magnetron sputtering method. Ultrasonic cleaning is performed on the sample (ie half-cell) first to remove impurities on the surface of the half-cell. Afterwards, an alloy target composed of metal cerium and gadolinium 9:1 (atomic percentage) was selected, and the half-cell was place...

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Abstract

The invention provides a solid oxide fuel cell, a cerium oxide-based isolation layer and a preparation method of the cerium oxide-based isolation layer. The method comprises the steps that (1), a cerium-based alloy is used as a target material, a vacuum coating method is adopted for preparing a cerium-based alloy film on the surface of an electrolyte layer of a half cell of the solid oxide fuel cell, zirconium oxide-based ceramic film is adopted as the electrolyte layer, and an alloy film of cerium and a rare earth element with valence being trivalent is adopted as the cerium-based alloy film; and the half cell with the cerium-based alloy film obtained in the step (1) is sintered at the temperature of 900-1100 DEG C, and the cerium oxide-based isolation layer is formed on the electrolyte layer of the half cell of the fuel cell. By means of the cerium oxide-based isolation layer, performance and long-term operation stability of the solid oxide fuel cell are improved.

Description

technical field [0001] The invention relates to the technical field of solid oxide fuel cells, in particular to a solid oxide fuel cell, a cerium oxide-based isolation layer and a preparation method thereof. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy. It has high energy conversion efficiency because it is not limited by the Carnot cycle, and has no pollution to the environment. [0003] Among a variety of fuel cells, solid oxide fuel cells (Solid Oxide Fuel Cell, SOFC) have an all-ceramic solid structure, do not require noble metal catalysts and can directly use carbon-based fuels. In addition, the higher operating temperature also makes the energy of SOFC The conversion efficiency is further improved. Therefore, solid oxide fuel cells have received widespread attention from governments, developers, and research institutions in recent years, and have shown broad...

Claims

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Application Information

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IPC IPC(8): C23C14/35C23C14/18C23C14/58C23C14/54C23C14/02H01M8/0208H01M8/1213
CPCY02E60/50
Inventor 韩敏芳王怡戈武俊伟朱腾龙
Owner TSINGHUA UNIV
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