Zr-position doped high conductivity proton conductor material for La2Zr2O7 basal body and preparing method thereof

A high-conductivity, proton-conducting technology, applied in the direction of non-metallic conductors, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of low conduction temperature, and achieve the effects of simple preparation method, improved electrical performance, and low cost

Inactive Publication Date: 2007-09-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zr-based pyrochlore has some special electrical properties: in an oxygen atmosphere, the ionic conductivity at medium temperature (400-800°C) exceeds that of yttria-stabilized zirconia; and some oxides (such as La 2 Zr 2 o 7 ) exhibits proton conduction behavior in a water vapor-saturated hydrogen atmosphere. After the rare earth elements are replaced by low-valent ions (such as rare earth Y or alkaline earth metals Ca, Sr), the conductivity increases, and the proton conductivity can be compared with perovskite Structural proton-conducting oxides, but conduction at a lower temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Get lanthanum oxide 54.14 grams, zirconia 32.76 grams, ytterbium oxide 13.10 grams, prepare La 2 Zr 1.6 Yb 0.4 o 7-δ (δ=0.2). The mixture was mixed by ball milling, using absolute ethanol as the medium, and the ball milling time was 6 hours. After drying, it was synthesized at 1400°C and kept for 8 hours. After ball milling again, it is dried, sieved and granulated, and the sample is formed by dry pressing (100MPa) + isostatic pressing (200MPa), sintered in the air at 1580°C, the heating rate is 3°C / min, and the heat preservation is 6 hours to obtain sintering body. The proton conductivity at 700 °C in a wet hydrogen atmosphere is 1.03×10 -3 S / cm.

Embodiment 2

[0021] Get lanthanum oxide 54.35 grams, zirconia 32.89 grams, erbium oxide 12.76 grams, prepare La 2 Zr 1.6 Er 0.4 o 7-δ (δ=0.2). The mixture was mixed by ball milling, using absolute ethanol as the medium, and the ball milling time was 6 hours. After drying, it was pre-synthesized at 1400°C and kept for 8 hours. After ball milling again, it is dried, sieved and granulated, and the sample is formed by dry pressing (100MPa) + isostatic pressing (200MPa), sintered at 1600°C in air, with a heating rate of 4°C / min, and heat preservation for 2 hours to obtain sintering body. The proton conductivity at 700°C in a wet hydrogen atmosphere is 4.0×10 -4 S / cm.

Embodiment 3

[0023] Get 54.72 grams of lanthanum oxide, 33.11 grams of zirconia, and 12.18 grams of gadolinium oxide to prepare La 2 Zr 1.6 Gd 0.4 o 7-δ (δ=0.2). The mixture was mixed by ball milling, using absolute ethanol as the medium, and the ball milling time was 8 hours. After drying, it was pre-synthesized at 1400°C and kept for 8 hours. After ball milling again, it is dried, sieved and granulated, and the sample is formed by dry pressing (100MPa) + isostatic pressing (200MPa), sintered in the air at 1580°C, the heating rate is 3°C / min, and the heat preservation is 6 hours to obtain sintering body. The proton conductivity at 700°C in a wet hydrogen atmosphere is 2.8×10 -4 S / cm.

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Abstract

This invention discloses a proton conductor material of high electric conductance of La2Zr2O7matrix doped at Zr bit and its preparation method, in which, the molecular structure of the material is: La2Zr2-xMxO7-delta, and M is Yb3+, Er3+, Gd3+ or Sc3+, x is 0.01-1, delta is x/2. The preparation process includes: taking La2O3, ZrO2 and Yb2O3 or Er2O3, Gd2O3 or Sc2O3 as the raw materials to match with them according to the mol ratio of each material in terms of the molecular formula and adds dispersant in light of the mass percentage of the adjuvant then to ball-mill and mix them with the adjuvant with water or alcohol as the medium to be dried to get powder to be milled, dried, screened, synthesized and heat-preserved to get the material, which is ball-milled and pressed to be sintered in 1400-1650deg.C and cooled to the room temperature to get the material.

Description

technical field [0001] The present invention relates to a kind of La 2 Zr 2 o 7 The invention relates to a high-conductivity proton conductor material doped with Zr sites in a matrix and a preparation method thereof, belonging to the advanced ceramic material technology. Background technique [0002] Studies have shown that pyrochlore-type materials have excellent electrical properties, high ionic conductivity required for solid electrolytes and high mixed conductivity required for electrode materials, thus making them possible to become electrolytes or electrode materials for fuel cells. Lanthanum zirconate (La 2 Zr 2 o 7 ) is a hot spot in the research of pyrochlore, especially its electrical properties. Its unique properties make it have broad prospects for application in many fields, such as: catalytic combustion active agent, high temperature thermal insulation coating , electrolytes for solid oxide fuel cells, immobilization substrates for actinide elements in nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00H01B1/06C04B35/48
Inventor 郭瑞松尹自光彭珍珍戚雯余芬
Owner TIANJIN UNIV
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