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Preparation method of high-conductivity perovskite type BaZrO3-based proton conductor material with controllable grain size

A high-conductivity, perovskite-type technology, applied in chemical instruments and methods, circuits, fuel cells, etc., can solve the problems of difficult grain growth, unsuitable for BaZrO application, uncontrollable grain size, etc. The effects of reduced boundary impedance, improved total conductivity, and simple preparation methods

Active Publication Date: 2021-11-19
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing BaZrO 3 The powder obtained by the synthesis method has uncontrollable grain size, and it is difficult to grow grains during the sintering process, which cannot meet the requirements of BaZrO 3 Applications in various aspects

Method used

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  • Preparation method of high-conductivity perovskite type BaZrO3-based proton conductor material with controllable grain size
  • Preparation method of high-conductivity perovskite type BaZrO3-based proton conductor material with controllable grain size
  • Preparation method of high-conductivity perovskite type BaZrO3-based proton conductor material with controllable grain size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 1 mole of barium nitrate, add it to an appropriate amount of deionized water, and after the barium nitrate is completely dissolved, add 1 mole of (ZrO 2 ) 0.92 (Y 2 O3) 0.08 (particle size is 0.15-5 μm), placed on a magnetic stirrer, heated at 80° C. and continuously stirred to volatilize water to obtain dry mixed powder. Then the mixed powder was placed in an alumina crucible and placed in a tubular muffle furnace for calcination. During the heating process, the heating rate was 1.33°C / min, and finally kept at 800°C for 2 hours. Nitrogen was introduced into the tubular muffle furnace during the reaction, and the flow rate of nitrogen was 60 mL / min. After cooling, the XRD pattern of the synthesized BZY15 powder is as follows figure 1 shown. It can be seen from the figure that the characteristic diffraction peaks of the samples are all consistent with those of BaZrO 3 The standard card corresponds to the successful synthesis of BZY15 powder. The grain size ...

Embodiment 2

[0030] Weigh 1 mole of barium nitrate, add it to an appropriate amount of deionized water, and after the barium nitrate is completely dissolved, add 1 mole of (ZrO 2 ) 0.92 (Y 2 O3) 0.08 (particle size is 0.15-5 μm), placed on a magnetic stirrer, heated at 80° C. and continuously stirred to volatilize water to obtain dry mixed powder. Then the mixed powder was placed in an alumina crucible and placed in a tubular muffle furnace for calcination at a heating rate of 2.22°C / min, and finally kept at 800°C for 3h. Nitrogen was fed into the tubular muffle furnace during the reaction, and the flow rate of nitrogen was 60 mL / min. After cooling, the grain size of the synthesized powder is about 1.428μm. The electrochemical test steps are the same as in Example 1. At 600°C, its conductivity reaches 4.44×10 -3 S cm -1 .

Embodiment 3

[0032]Weigh 1 mole of barium nitrate, add it to an appropriate amount of deionized water, and after the barium nitrate is completely dissolved, add 1 mole of (ZrO 2 ) 0.92 (Y 2 O3) 0.08 (particle size is 0.15-5 μm), placed on a magnetic stirrer, heated at 80° C. and continuously stirred to volatilize water to obtain dry mixed powder. Then the mixed powder was placed in an alumina crucible and placed in a tubular muffle furnace for calcination. During the heating process, the heating rate was 3.33°C / min, and finally kept at 850°C for 2h. Nitrogen was passed through during the reaction, and the flow rate of nitrogen was 20 mL / min. After cooling, the grain size of the synthesized powder is about 1.337μm. The electrochemical test steps are the same as in Example 1. At 600°C, its conductivity reaches 4.32×10 -3 S cm -1 .

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Abstract

The invention discloses a preparation method of a high-conductivity perovskite type BaZrO3-based proton conductor material with a controllable grain size. According to the method, (ZrO2)1-x(Y2O3)x (x is larger than or equal to 0.05 and smaller than or equal to 0.08) powder is adopted as an initial raw material, and the BaZrO3-based proton conductor powder material with the controllable grain size is synthesized at the low temperature. According to the invention, the problems of wide grain size distribution and non-uniform chemical composition in the traditional solid-phase synthesis process, tedious steps and difficult grain growth in the wet-chemical synthesis process. and the like are solved; the perovskite type BaZrO3-based proton conductor material prepared by the method is regular in shape, high in crystallinity and uniform in dispersion; and after densification treatment, the proton conductivity is good, the grain boundary impedance is greatly reduced, and the conductivity at 600 DEG C can reach 4.92*10<-3> S cm<-1>.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a high-conductivity perovskite-type BaZrO with controllable grain size 3 A method for preparing a matrix proton conductor material, specifically relating to an improved solid-state method for preparing high-conductivity perovskite-type BaZrO 3 Methods for matrix proton conductor materials. Background technique [0002] A high-temperature proton conductor refers to a substance that has proton conductivity in a high-temperature hydrogen-containing or hydrogen-containing atmosphere. High-temperature proton conductors have broad application prospects in electrolyzers, hydrogen sensors, hydrogen separation membranes, and medium-low temperature solid oxide fuel cells. Among the currently available high-temperature proton conductor materials, ABO 3 Type perovskite oxides have the best proton conductivity. Among them, BaCeO 3 Has a high proton conductivity, but in the presence of C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/00H01M8/1253
CPCC01G25/00H01M8/1253C01P2004/38C01P2004/62C01P2004/61C01P2006/40C01P2002/34Y02E60/50
Inventor 葛林孙克强徐冬
Owner NANJING UNIV OF TECH
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