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Method for synthesizing electron-ion mixed conductor material

A technology of mixed conductors and synthesis methods, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of material synthesis difficulties, research and application difficulties, etc., and achieve the effect of easy control of the synthesis process, simple and easy synthesis process, and fine particles

Inactive Publication Date: 2007-10-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

with ABO 3 type perovskite structure compound, K 2 NiF 4 structure of La 2-x Sr x Ni 1-y Me y o 4+δ The synthesis of system materials is more difficult
for a single K 2 NiF 4 The synthetic product of structure, when adopting solid-phase reaction method, often need through long time (tens of hours to dozens of hours) repeatedly, multiple high-temperature (1000~1250 ℃) solid-phase synthesis process (see V.V.Kharton, A.P.Viskup, E.N.Naumovich, F.M.B.Marques, J.Mater.Chem.1999, 9:2623 and M.A.Darorukh, V.V.Vashook, H.Ullmann, et al., Solid State Ionics, 2003, 158:141), which gives the material Difficulties in the research and application of

Method used

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  • Method for synthesizing electron-ion mixed conductor material
  • Method for synthesizing electron-ion mixed conductor material
  • Method for synthesizing electron-ion mixed conductor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of precursor solution: press La 2 NiO 4+δ The stoichiometric ratio weighs a certain amount of lanthanum hydroxide La(OH) 3 and basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, add diethylenetriaminepentaacetic acid according to the molar ratio of diethylenetriaminepentaacetic acid to the total amount of various metal ions of 1.7:3, put the mixture in a beaker and add an appropriate amount of deionized water, and put it at 90 ° C Heated and stirred for 4 hours to obtain a clear and transparent precursor solution;

[0020] (2) Preparation of solid precursor: put the above precursor solution into a constant temperature drying oven, heat and dry the precursor solution at 120° C. for 12 hours to obtain a transparent glassy aminopolycarboxylic acid complex precursor;

[0021] (3) Preparation of synthetic powder: the obtained solid precursor was placed on a corundum plate and sent into a muffle furnace, heated to 900° C. in an air atmosphere and kept for 2 ...

Embodiment 2

[0023] (1) Preparation of precursor solution: press La 1.8 Sr 0.4 NiO 4+δ The stoichiometric ratio weighs a certain amount of lanthanum hydroxide La(OH) 3 , strontium carbonate SrCO 3 and basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, add diethylenetriaminepentaacetic acid according to the molar ratio of diethylenetriaminepentaacetic acid to the total amount of various metal ions of 1.6:3, put the mixture in a beaker and add an appropriate amount of deionized water, and put it at 100 ° C Heated and stirred for 6 hours to obtain a clear and transparent precursor solution;

[0024] (2) Preparation of solid precursor: put the above precursor solution into a constant temperature drying oven, heat and dry the precursor solution at 140° C. for 8 hours to obtain a transparent glassy aminopolycarboxylic acid complex precursor;

[0025](3) Preparation of synthetic powder: the obtained solid precursor was placed on a corundum plate and sent into a muffle furnace, heated to 800° ...

Embodiment 3

[0027] (1) Preparation of precursor solution: press La 2 Ni 0.8 co 0.2 o 4+δ The stoichiometric ratio weighs a certain amount of lanthanum hydroxide La(OH) 3 , Basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O and cobalt carbonate CoCO 3 , add diethylenetriaminepentaacetic acid according to the molar ratio of diethylenetriaminepentaacetic acid to the total amount of various metal ions of 1.9:3, put the mixed solution in a beaker and add an appropriate amount of deionized water, at 80 ° C Heated and stirred for 8 hours to obtain a clear and transparent precursor solution;

[0028] (2) Preparation of solid precursor: put the above precursor solution into a constant temperature drying oven, heat and dry the precursor solution at 110° C. for 18 hours to obtain a transparent glassy aminopolycarboxylic acid complex precursor;

[0029] (3) Preparation of synthetic powder: the obtained solid precursor was placed on a corundum plate and sent into a muffle furnace, heated to 950° C...

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Abstract

The present invention relates to a method for synthesizing a electron-ion mixed conducting material with a K2NiF4 structure of the La2-xSrxNi1-yMeyo4+delta system. The carbonate or hydroxide of various component elements is mixed with diethylenetriamine pentaacetic acid in deionized water according to the stoichiometric ratio of synthetic product, the mixture is heated and agitated so that the carbonate or hydroxide is dissolved completely to form clarifying and transparent solution of precursor, and then the transparent glass state aminopolycarboxylic acid complexes precursor is obtained by means of heating and drying; finally, the complexes precursor is heated to create the ultramicro composite powder with single K2NiF4 structure. The present invention has a simple synthesizing technology, a low synthesizing temperature, a short synthesizing time, a controllable synthesizing process, and an excellent repeatability. The synthetic product has a high phase purity, fine and uniform particles, and can be widely used as the cathode of moderate temperature solid oxide fuel battery, and used for the electrochemical sensor and the oxygen separation membrane, and has a broad application prospect.

Description

technical field [0001] The present invention relates to a kind of K 2 NiF 4 structure of La 2-x Sr x Ni 1-y Me y o 4+δ (Me=Co, Cu, Fe or Mn, x=0-1.5, y=0-1, δ is the non-stoichiometric oxygen content) system electron-ion mixed conductor material synthesis method, which belongs to the field of solid ion conductors. Background technique [0002] La 2-x Sr x Ni 1-y Me y o 4+δ The system material is a kind of A 2 BO 4+δ type electron-ionic mixed conductor, belonging to the K 2 NiF 4 structure, with a rock-salt layer consisting of AO and ABO 3 A layered structure in which perovskite layers are alternately arranged along the c-axis direction. La 2-x Sr x Ni 1-y Me y o 4+δ The electron-oxygen ion mixed conductivity of the system material mainly comes from the migration of interstitial oxygen in the interstitial positions of AO rock salt layers and the migration of ABO 3 The P-type electrons in the perovskite layer conduct electricity. In addition, La 2-x Sr ...

Claims

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Application Information

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IPC IPC(8): C01G1/02C01G51/04
Inventor 徐庆黄端平张枫陈文刘韩星
Owner WUHAN UNIV OF TECH
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