Compound solid oxide fuel cell and preparation method thereof

A solid oxide, fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of performance degradation, complex preparation process, poor electronic conductivity, etc., to solve the problem of high interface resistance, simple preparation process and high performance Effect

Active Publication Date: 2019-06-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the one hand, the increase of ohmic resistance at low temperature, especially for oxygen-ion-type electrolytes, will lead to a sharp decline in performance; The application of biofuel cells under medium and low temperature conditions, such as the thermal matching between the commonly used oxygen ion-conducting oxide membrane material YSZ and the commonly used LSCF, BSCF and other barium- and strontium-containing cathodes and the high-temperature reaction to form a non-conductive layer
Studies have shown that adding a dense interlayer between the electrolyte and the cathode, such as sputtering or chemical vapor deposition of a GDC dense interlayer on the surface of YSZ, can improve the overall battery performance, but the preparation process is more complicated and the cost is higher (Solid State Ionics, 2016, 295 :25-31.)
In addition, new cathode materials such as BCFZY have high ion conductivity, but poor electronic conductivity, only 1.3S / cm at 700°C (Science, 2015, 349:6254.), and the performance can be improved by coating Au collector layer double, but the above method has the disadvantages of high cost and unfavorable industrialized production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] NiO, YSZ, and BZY were ball-milled for 32 hours according to the mass ratio of 45:25:30, mixed evenly, tape-casted, and sintered at 960°C for 6 hours to obtain a 360-micron-thick anode green body. The mixed slurry of YSZ and BZY was drip-coated on the anode ceramic green body with a mass ratio of 1:1. After drying for 10 hours, it was sintered at 1290°C for 8 hours to obtain a 20-micron YSZ (BZY) composite film with a density of 96.3%. Mix GDC and YSZ at a molar ratio of 1:0.1, add terpineol and PVB glue, the mass ratio to the mixed powder is 0.3:1:1, stir evenly and ultrasonicate for 38 hours to obtain interlayer slurry. The interlayer slurry was drip-coated on the surface of the dense YSZ (BZY) composite membrane, dried at room temperature for 8 hours, and then sintered at 1300°C for 5 hours to obtain a composite film with a porosity of 63%, a pore size of 0.12 microns to 0.50 microns, and a thickness of 3.2 microns. Porous compartment. Then apply the BCFZY cathode s...

Embodiment 2

[0017] NiO, YSZ, and BZY were ball-milled for 42 hours according to the mass ratio of 40:30:30, mixed evenly, tape-casted, and sintered at 1000°C for 5 hours to obtain a 420-micron-thick anode green body. The YSZ and BZY slurry was drip-coated on the anode ceramic green body, dried for 10 hours and then sintered at 1310° C. for 6 hours to obtain a 10-micron YSZ (BZY) composite film with a density of 98.5%. Add fish oil and PVB glue to GDC at a mass ratio of 0.3:1:1 to the mixed powder, stir evenly and ultrasonicate for 52 hours to obtain interlayer slurry. The interlayer slurry was screen-printed onto the surface of the YSZ (BZY) composite membrane, dried at room temperature for 12 hours, and then sintered at 1320°C for 6 hours to obtain a film with a porosity of 58.2%, a pore size of 0.2 microns to 2.0 microns, and a thickness of 8 microns. GDC porous barrier. Then apply the LSM cathode slurry to the interlayer, dry at room temperature, coat the LSC cathode, and sinter at 10...

Embodiment 3

[0019] NiO, YSZ, and BZY were ball-milled for 56 hours according to the mass ratio of 50:25:25, mixed evenly, tape-cast, and sintered at 960°C for 6 hours to obtain a 370-micron-thick anode green body. The YSZ and BZY composite slurry was drip-coated on the anode ceramic green body, dried for 10 hours and then sintered at 1310° C. for 7 hours to obtain an 8-micron YSZ (BZY) composite film with a density of 97.8%. Mix GDC and CMO at a molar ratio of 1:0.01, and add terpineol containing 6% ethyl cellulose, n-butanol, and the mass ratio of the mixed powder is 0.3:1:1, stir evenly and ultrasonically for 24h to obtain layer slurry. The interlayer slurry was spin-coated on the surface of the dense YSZ (BZY) composite membrane, dried at room temperature for 2 hours, and then sintered at 1320°C for 3 hours to obtain a film with a porosity of 53%, a pore size of 0.20 μm to 0.80 μm, and a thickness of 5 μm. Composite porous barrier. Then apply the BCFZY slurry to the interlayer, dry a...

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Abstract

The invention relates to a compound solid oxide fuel cell, which consists of a compound positive electrode layer, an oxygen ion-proton double-conductor compound electrolyte layer, a compound porous electrolyte interlayer and a double-negative-electrode layer, wherein the compound electrolyte layer can simultaneously carry out proton electrical conduction and oxygen ion electrical conduction, and electrolyte ion electrical conduction can achieve performance requirements at intermediate, low and high temperatures; the compound porous electrolyte interlayer can effectively obstruct reaction between the negative electrode and the electrolyte so as to lower interfere resistance; and the double-negative-electrode layer consists of an electron electrical conduction enhancement layer and an ion electrical conduction enhancement layer, and polarization resistance is greatly lowered. Therefore, the compound solid oxide fuel can meet performance requirements at any SOFC (Solid Oxide Fuel Cell) operation temperature (350-800DEG C), and has a wide application value.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, in particular to a composite solid oxide fuel cell. Background technique [0002] Traditional solid oxide fuel cells mostly use oxygen ions as carriers. This type of battery was discovered earlier, and the current research is relatively mature, and some of them have been commercialized. However, too high operating temperature (800°C-1000°C) brings problems to battery cost and long-term stability. However, the currently researched hot proton fuel cells use hydrogen ions as carriers, theoretically the transmission activation energy is three orders of magnitude lower than that of oxygen ions, and the operating temperature is between 350°C and 550°C, but the research is not yet mature, and there are still Sinterability and stability in acidic atmosphere and other issues. Therefore, the development of a solid oxide fuel cell suitable for use in various temperature ranges, especially at low temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1253H01M8/1213
CPCY02E60/50
Inventor 程谟杰戚惠颖赵哲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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