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Gradient porosity anode for solid oxide fuel cell and fuel cell

A solid oxide, fuel cell technology, used in fuel cells, battery electrodes, circuits, etc., to increase the activation specific surface area, improve overall performance, and improve thermal matching.

Active Publication Date: 2021-01-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for anode-supported solid oxide fuel cells, the thickness of the anode support layer occupies the main thickness of the entire cell, so the horizontal gradient structure has no advantage in anode-supported solid oxide fuel cells

Method used

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  • Gradient porosity anode for solid oxide fuel cell and fuel cell
  • Gradient porosity anode for solid oxide fuel cell and fuel cell
  • Gradient porosity anode for solid oxide fuel cell and fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to figure 1 The solid oxide fuel cell gradient porosity anode is composed of an anode support layer 6, an anode transition layer 7 and an anode functional layer 8, wherein the thicknesses of the anode support layer 6, anode transition layer 7 and anode function layer 8 are 600 μm and 30 μm respectively and 30μm.

[0036] The solid oxide fuel cell gradient porosity anode is Ni-YSZ cermet, and it is prepared by casting or spraying. The specific preparation process is as follows:

[0037] First, the anode functional layer 8 is adjacent to the electrolyte layer 2, and the opening porosity of the anode functional layer 8 is linearly decreased from 0.3 to 0.1 along the horizontal direction of the electrode by controlling the content of the pore-forming agent. The electrochemical reaction mainly occurs in the anode functional layer 8, and the porosity of the anode functional layer 8 changes gradually along the horizontal direction, which is conducive to further increasing...

Embodiment 2

[0043] The difference between this embodiment and Embodiment 1 is that in the anode functional layer 8, by controlling the content of the pore-forming agent, the opening porosity of the anode functional layer 8 increases linearly from 0.1 to 0.1 along the horizontal direction of the electrode. 0.3; in the anode transition layer 7, by controlling the content of the pore former, the opening porosity of the anode transition layer 7 increases linearly from 0.3 to 0.5 along the horizontal direction of the electrode; in the anode support layer 6, by controlling The content of the pore-forming agent makes the opening porosity of the anode support layer 6 linearly increase from 0.5 to 0.7 along the horizontal direction, and its output power density is between Figure 5 shown.

Embodiment 3

[0045] In order to further enhance the strength of the solid oxide fuel cell, the anode support layer 6 has at least 2 layers, at most 60 layers, preferably 20-35 layers, and the opening porosity gradient of each anode support layer 6 increases progressively from top to bottom, which can be While ensuring the comprehensive electrical performance of the solid oxide fuel cell, the strength of the cell can be further improved.

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Abstract

The invention discloses a solid oxide fuel cell gradient porosity anode and a solid oxide fuel cell. The solid oxide fuel cell gradient porosity anode comprises an anode function layer, an anode transition layer and an anode support layer which are connected in sequence from top to bottom. The opening porosity of the anode transition layer is greater than or equal to the opening porosity of the anode function layer. The opening porosity of the anode transition layer is smaller than or equal to the opening porosity of the anode support layer. The opening porosity of the anode function layer, the opening porosity of the anode transition layer and the opening porosity of the anode support layer are in gradient gradual decrease along a horizontal direction, or the opening porosity of the anodefunction layer, the opening porosity of the anode transition layer and the opening porosity of the anode support layer are in gradient gradual increase. The anode is characterized by relatively low activation polarization, concentration polarization and ohm polarization loss. The fuel cell is characterized by high output electrical property and high intensity.

Description

technical field [0001] The invention belongs to the field of fuel cells and relates to a solid oxide fuel cell gradient porosity anode and a fuel cell. Background technique [0002] Solid oxide fuel cells have many advantages such as wide fuel adaptability, high energy conversion efficiency, all-solid-state, modular assembly, and zero pollution. And as a mobile power source such as a ship power source, a traffic vehicle power source, etc., it has broad application prospects. In recent years, the anode-supported solid oxide fuel cell has received extensive attention. Its thickened anode support layer can effectively absorb the heat generated in the electrolyte and nearby areas, and its electrolyte can be made relatively thin, which can effectively reduce the heat produced by oxygen ion transfer. The heat, thereby reducing the operating temperature of solid oxide fuel cells, is favored by researchers. [0003] As a key component of an anode-supported solid oxide fuel cell, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M8/1231
CPCH01M4/861H01M2008/1293H01M8/1231Y02E60/50
Inventor 王秋旺付佩杨剑
Owner XI AN JIAOTONG UNIV
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