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Preparation method of SOFC electrolyte surface micro-convex structure and product thereof

A micro-convex structure and electrolyte technology, applied in solid electrolyte fuel cells, circuits, fuel cells, etc., can solve the problem of blocking electron and ion transport channels, difficult to ensure chemical bonding at the same time, and difficult to ensure that the electrolyte particles in the composite cathode are separated from the cathode particles. Interconnection and other issues to achieve the effect of increasing the effective reaction area, reducing polarization, and improving electrode performance

Active Publication Date: 2014-01-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because: (1) This powder mixing method is difficult to ensure that the electrolyte particles and cathode particles in the composite cathode are connected to each other, and there are many isolated electrolyte particles blocked by the cathode particles and isolated cathode particles blocked by the electrolyte particles in the composite cathode. Does not improve the effective three-phase reaction interface, but hinders the transport channels of electrons and ions
(2) Under the condition of ensuring sufficient porosity and shape requirements, it is difficult to ensure that the electrolyte particles and cathode particles in the composite cathode are respectively ideal due to the difference in melting point between the electrolyte particles and the cathode particles by about 1000°C. chemical combination

Method used

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  • Preparation method of SOFC electrolyte surface micro-convex structure and product thereof
  • Preparation method of SOFC electrolyte surface micro-convex structure and product thereof
  • Preparation method of SOFC electrolyte surface micro-convex structure and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: See figure 2 , image 3 and Figure 4 As shown, on the electrolyte surface of the half-cell (including NiO / YSZ anode and YSZ electrolyte) prepared by casting method, spherical YSZ particles of 10-20 μm were used as spraying materials (as attached figure 1As shown), the spherical YSZ particles of 10-20 μm are sprayed onto the surface of the electrolyte substrate at a temperature of 600 °C by oxyacetylene flame spraying method; by controlling the parameters of the spraying, the flying speed of the particles is controlled so that the particles hit the front surface of the electrolyte surface Partial melting and most of them do not rebound, the unmelted solid particles protrude to form a particle convex structure, and the melted part combines with the electrolyte matrix to build a micro-convex structure layer composed of electrolyte materials on the surface of the existing electrolyte. Using a high-resolution electron microscope to analyze and count the cross-...

Embodiment 2

[0039] Example 2: See Figure 5 , Figure 6 and Figure 7 As shown, 5–25 μm sintered broken ScSZ (Sc 2 o 3 Stabilized ZrO 2 ) particles are spraying materials, and the oxyacetylene flame spraying method is used to spray ScSZ particles onto the surface of the electrolyte matrix at a temperature of 500°C; by controlling the parameters of the spraying, the flight speed and melting state of the particles are controlled, so that the particles hit the electrolyte surface before The surface layer is partially melted and most of it does not rebound. The unmelted solid particles protrude to form a particle convex structure, and the melted part combines with the matrix to build a micro-convex structure layer composed of electrolyte materials on the surface of the existing electrolyte. High-resolution electron microscopy is used The analysis and statistics of 50 deposited particles and the cross-section of the substrate show that the chemical combination rate is about 62%, and the su...

Embodiment 3

[0043] Example 3: See Figure 8 and Figure 9 As shown, 5–25 μm sintered broken YSZ (Y 2 o 3 Stabilized ZrO 2 ) particles are spraying materials, and the oxyacetylene flame spraying method is used to spray YSZ particles onto the surface of the electrolyte matrix at a temperature of 500°C; by controlling the parameters of the spraying, the flight speed and melting state of the particles are controlled, so that the particles hit the electrolyte surface before The surface layer is partially melted and most of it does not rebound, and the unmelted solid particles protrude to form a particle convex structure, and the melted part combines with the matrix to build a slightly convex structure layer composed of electrolyte materials on the surface of the existing electrolyte. The surface area of ​​the structured electrolyte is doubled compared with that before preparation.

[0044] The technical parameters of oxyacetylene flame spraying in Example 3 of the present invention are sho...

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Abstract

The invention discloses a preparation method of a SOFC electrolyte surface micro-convex structure and a product thereof. The preparation method comprises the following steps: heating a half-cell composed of an anode and an electrolyte to 500-1000 DEG C, spraying a particle which have a particle size of 1-50 microns, a melted surface and an unmelted core onto the surface of the electrolyte by a oxyacetylene flame spraying method, after the particle impacts the electrolyte matrix, allowing the melted portion to flow along the electrolyte matrix surface so as to connect the solid core with the electrolyte matrix to form the electrolyte surface micro-convex structure; the electrolyte is an ionic conductor or a proton conductor, and the conductivity of the particle is higher than or equal to the conductivity of the electrolyte. The invention enlarges the surface area of the electrolyte surface through the method of depositing electrolyte ceramic particles to construct the micro-convex structure of the electrolyte surface, thus increases the effective reaction area, and realizes the improvement of the electrode performance; the invention is applicable to various cell structures including SOFC with flat and tubular structures.

Description

【Technical field】 [0001] The invention relates to the fields of material processing and energy power, in particular to the structure of the electrolyte surface of a solid oxide fuel cell. 【Background technique】 [0002] Solid oxide fuel cells (SOFC) have the characteristics of high power generation efficiency and environmental friendliness, and can directly use fuel gases such as hydrogen, natural gas, and biomass gasification gas, so they have attracted extensive attention. Research so far has shown that a SOFC power generation demonstration system with a power output exceeding 150kW can be prepared to meet the operation requirements of the power station. However, the key to commercial application of SOFC power generation systems is the low output power density and high system manufacturing costs. [0003] With the optimization of battery structure and the increase of output power density, cathode polarization has become a bottleneck restricting battery output performance....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/10H01M8/1253H01M8/126
CPCY02E60/521Y02E60/50
Inventor 李长久李成新杨冠军
Owner XI AN JIAOTONG UNIV
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