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Anode load type solid electrolyte of yttrium oxide stabilized zirconium oxide and its preparing process

A technology for stabilizing zirconia and solid electrolyte, which is applied in the field of invention and can solve the problems of difficult materials, strict requirements for sealing materials and bipolar connection materials, etc.

Inactive Publication Date: 2004-07-14
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

However, such a high temperature has strict requirements on sealing materials and bipolar connection materials, and the materials are difficult to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1: YSZ / ethanol suspension (0.2g / ml) preparation

[0014] Weigh 2 grams of the commercial product 8% mol YSZ (~1 μm), measure 20 milliliters of absolute ethanol into 50 milliliter Erlenmeyer flasks, and form a suspension in an ultrasonic instrument for more than 1 hour. The suspending agent in the suspension may be solvents such as methanol, propanol, and isopropanol other than ethanol.

example 2

[0015] Example 2: Preparation of YSZ solid electrolyte film (10 μm)

[0016] Place the anode substrate (YSZ:NiO=1:1 weight) disc with a diameter of 22 mm and a thickness of 0.5 mm on a water platform, soak it with ethanol, and after the surface of the base disc is dry, pipette 0.15 ml of the above-mentioned YSZ ethanol to suspend Place the solution evenly on the disc. After the ethanol volatilizes, put it in a high-temperature oven for sintering at 1400°C, and heat up at a rate of 2-10°C / min. The holding time of each section is 250°C / 2h, 450°C / 1h, 1000°C / 1h. The holding time at 1400°C is 2 to 6 hours.

example 3

[0017] Example 3: Effect of Suspension Concentration on Thickness of Solid Electrolyte Film

[0018] The thickness of the YSZ solid electrolyte film can be adjusted by the concentration of various suspensions. Table 1 lists the thickness of the film prepared at three suspension concentrations. It can be seen from Table 1 that the thickness of the YSZ solid electrolyte film can be adjusted arbitrarily.

[0019] Table 1 Effect of suspension concentration on solid electrolyte film thickness

[0020] Suspension Concentration Suspension Volume Film Thickness*

[0021] (g / ml) (ml) (μm)

[0022] 0.2 0.15 20

[0023] 0.2 0.10 13

[0024] 0.1 0.15 10

[0025] 0.1 0.12 8

[0026] 0.07 0.15 7

[0027] 0.07 0.11 5

[0028] *According to the results of electron microscopy (SEM) analysis

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Abstract

An anode load type yttrium oxide-stabilized zirconium oxide solid electrolyte features that a layer of YSZ film with thickness of 5-20 microns is loaded on the anode substrate membrane which is an NiO (30-80 wt.%) and YSZ compounded porous ceramics with thickness of 0.1-1 mm and porosity of 30-50%. Its preparing process includes preparing YSZ suspension; dispersing the suspension on anode substrate membrane uniformly, evaporating to form YSZ film; and sintering at 250-1400 deg.C in normal pressure air for 4-12 hr. It can be used for medium temp. (800 deg.C) SOFC.

Description

technical field [0001] The invention relates to solid oxide fuel cell technology, and in particular provides an anode-loaded yttria-stabilized zirconia solid electrolyte that can be used as a medium-temperature solid oxide fuel cell and its preparation technology. Specifically, the first step is to prepare Zirconia (YSZ) composite oxide porous ceramic anode substrate stabilized with NiO and yttria (patent application number 98113759.8), and then a layer of uniform YSZ solid electrolyte film of 5-20 μm is prepared on the basis of the anode substrate, which is sintered at 1400 ° C A dense ion-conducting membrane is formed, so that the operating temperature of the solid oxide fuel cell can be performed below 800°C. Background technique [0002] The solid oxide fuel cell is an electrochemical energy conversion device that directly converts chemical energy into electrical energy. It is a new type of fuel cell technology developed rapidly in the 1980s. The preparation method of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1246H01M8/1253
CPCY02E60/521Y02E60/525Y02E60/50
Inventor 江义董永来张义煌阎景旺卢自桂
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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