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Fluidized bed cathode solid oxide fuel cell

A solid oxide and fuel cell technology, which is applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of ineffective improvement of concentration polarization, inability to apply hydrogen-oxygen fuel cells, and difficulty in large-scale utilization, so as to reduce heat The possibility of stress destroying the battery, increasing the active sites of chemical reactions, and solving the effect of small stack capacity

Active Publication Date: 2021-08-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It was found that surface modification significantly improved the cathode oxygen reduction activity of lanthanum strontium cobalt iron, that is, reduced the activation polarization of the cathode, but it also had little effect on the improvement of concentration polarization, and the process was complicated and difficult to use on a large scale
[0007] CN 102324539 A discloses a fluidized bed electrode direct carbon fuel cell device, the invention proposes a fluidized bed anode fuel cell using carbon as fuel, but in the hydrogen-oxygen fuel cell, the rate-determining step of the battery is the cathode electrochemical reaction, so this technology is not suitable for hydrogen-oxygen fuel cells

Method used

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  • Fluidized bed cathode solid oxide fuel cell
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  • Fluidized bed cathode solid oxide fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment one: when using air as the fluidizing gas and hydrogen as the fuel gas, the specific implementation test steps are as follows:

[0035] The anode support tube was prepared by extrusion molding, and then the battery single tube of the anode support structure was prepared by layer-by-layer calcination and spraying, wherein the anode material of the battery single tube was nickel oxide / 8% yttria stabilized zirconia (NiO / YSZ ), the electrolyte material is YSZ, the barrier layer material is GDC, the cathode chamber filling is a mixture of LSCF and YSZ, and the surface of the battery single tube is coated with silver paste and silver wire for current collection. The shell and cover are made of quartz material, the air distribution plate is made of porous quartz sand core, and all gaps are sealed with high-temperature ceramic glue. Before the experiment, the particles in the cathode chamber are filled to one-third of the height of the cathode chamber.

[0036] First, ...

Embodiment 2

[0040] Embodiment 2: When using air as the fluidizing gas and ammonia as the fuel gas, the specific fluidized bed cathode solid oxide fuel cell process steps are as follows:

[0041] A microtube single cell with an electrode support structure, the anode material is NiO / YSZ, the electrolyte material is YSZ, a layer of GDC is attached to the outside of the electrolyte as a protective layer, and the cathode chamber is filled with LSCF / GDC mixed powder, and the filling height is the height of the cathode chamber two-fifths of.

[0042] When the device is started, the external auxiliary burner is used to burn hydrogen in the air atmosphere, and then the exhaust gas is passed into the air inlet and gas inlet of the fuel cell to heat the device. Wait for the device to heat up to 800 o At C, switch the fuel gas inlet gas to nitrogen for purging; after the purge is clean, switch the gas inlet gas to ammonia, and the air inlet gas to air, and adjust the air flow on the cathode side so ...

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Abstract

The invention provides a fluidized bed cathode solid oxide fuel cell, and the fuel cell combines fluidization engineering and a solid oxide fuel cell technology, and provides a novel cathode fluidized bed electrode solid oxide fuel cell technology. The fuel cell is not of a traditional 'sandwich' structure, fine electrode particles are fluidized by air flow on the air side of the cell, and the fluidized electrode particles are used as the cathode of the cell. According to the process, the cathode mass transfer rate and the reaction interface can be obviously increased, reduction of cathode concentration polarization and activation polarization is facilitated, and in addition, the heat transfer rate of the fluidized electrode is relatively high, so that reduction of thermal stress damage caused by non-uniform reaction of the battery is facilitated.

Description

technical field [0001] The invention relates to a fluidized bed electrode solid oxide fuel cell, which belongs to the technical field of solid oxide fuel cells. Background technique [0002] A fuel cell is a device that can directly convert fuel chemical energy into electrical energy. Among them, the solid oxide fuel cell technology has the advantages of high operating temperature, wide adaptability of raw materials, high power generation efficiency, and can realize cogeneration of heat and power. At present, solid oxide fuel cells mainly have two structures: tube type and plate type, both of which are electrode-electrolyte-electrode fixed "sandwich" structures. However, due to the inconsistent thermal expansion coefficients of the electrode material and the electrolyte material, cracks or poor contact may occur during processing, resulting in an increase in the ohmic impedance of the battery, which will seriously cause the battery to be unusable. In addition, conventional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1231H01M4/86
CPCH01M8/1231H01M4/86H01M2008/1293H01M2004/8689Y02E60/50
Inventor 肖睿吴石亮崔东旭赵聪凡张欣驰张宇鑫
Owner SOUTHEAST UNIV
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