CN101054196A - Method for synthesizing electron-ion mixed conductor material - Google Patents

Method for synthesizing electron-ion mixed conductor material Download PDF

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CN101054196A
CN101054196A CN 200710051856 CN200710051856A CN101054196A CN 101054196 A CN101054196 A CN 101054196A CN 200710051856 CN200710051856 CN 200710051856 CN 200710051856 A CN200710051856 A CN 200710051856A CN 101054196 A CN101054196 A CN 101054196A
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precursor solution
precursor
preparation
synthetic
carbonate
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CN100482590C (en
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徐庆
黄端平
张枫
陈文�
刘韩星
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Wuhan University of Technology WUT
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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

A kind of synthetic method of electron-ion mixed conductor material
Technical field
The present invention relates to a kind of K of having 2NiF 4The La of structure 2-xSr xNi 1-yMe yO 4+ δThe synthetic method of (y=0～1, δ is the nonstoichiometry oxygen level for Me=Co, Cu, Fe or Mn, x=0～1.5) system electronic-ion mixed conductor material belongs to the solid state ionic conductor field.
Background technology
La 2-xSr xNi 1-yMe yO 4+ δSystem material is a kind of A 2BO 4+ δThe type electron-ion mixed conductor belongs to K 2NiF 4Structure has by AO halite layer and ABO 3The laminate structure that calcium titanium ore bed is alternately arranged along the c direction of principal axis.La 2-xSr xNi 1-yMe yO 4+ δThe electronics of system material-oxonium ion hybrid conductive characteristic is mainly derived between the AO halite layer migration of calking oxygen and ABO on the interstitial site 3P type electronic conduction in the calcium titanium ore bed.In addition, La 2-xSr xNi 1-yMe yO 4+ δSystem material also has moderate thermal expansivity (12～13 * 10 -6/ ℃), good oxonium ion transmission performance is arranged in 600～800 ℃ mesophilic range.So, La in recent years 2-xSr xNi 1-yMe yO 4+ δThe system mixed conductor is subjected to extensive attention both domestic and external in the application of aspects such as middle temperature solid-oxide fuel tank negative electrode, electrochemical sensor, oxygen separation membrane.Nearest studies show that, at La 2-xSr xNi 1-yMe yO 4+ δThe B position introduce suitable transition metal ion the peak temperature of electronic conductivity is moved to the high temperature direction, the surperficial oxygen switching performance of strongthener, and can improve the sintering character of material.
At present, the conventional solid phase method of main both at home and abroad employing synthesizes K 2NiF 4The La of structure 2-xSr xNi 1-yMe yO 4+ δThe system material mixed conductor.With ABO 3The type perovskite structure compound is compared, K 2NiF 4The La of structure 2-xSr xNi 1-yMe yO 4+ δThe synthetic comparatively difficulty of system material.For obtaining single K 2NiF 4The synthetic product of structure, when adopting solid reaction process, usually need through long-time (tens hours to tens hours) repeatedly, high temperature repeatedly (1000～1250 ℃) solid phase synthesis process (sees 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), this gives the research of this material and uses and all bring difficulty.Therefore, need to explore and study novel, the efficient synthesis of this electron-like-ion mixed conductor material.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of technology simple, the easy synthetic K that has 2NiF 4The La of structure 2-xSr xNi 1-yMe yO 4+ δThe method of system electronic-ion mixed conductor material, and the thing phase purity height of synthetic product.
The technical scheme that the present invention solves its technical problem employing is: adopt to comprise the steps synthetic a kind of K of having 2NiF 4The La of structure 2-xSr xNi 1-yMe yO 4+ δThe synthetic method of system electronic-ion mixed conductor material, in the molecular formula, Me=Co, Cu, Fe or Mn, x=0～1.5, y=0～1.
(1) preparation of precursor solution: according to the stoichiometric ratio of synthetic product, the carbonate or the oxyhydroxide of various components are mixed in deionized water with diethylenetriamine pentaacetic acid, heated and stirred is dissolved carbonate or oxyhydroxide fully, forms the precursor solution of clear;
(2) preparation of solid precursor: the gained precursor solution is carried out heat drying, form transparent vitreous state aminopolycanboxylic acid title complex presoma;
(3) preparation of synthetic powder: the solid precursor to gained is heat-treated, and obtains having single K 2NiF 4The ultra tiny synthetic powder of structure.
The present invention compares with conventional synthesis by solid state reaction, and its beneficial effect is: synthesis technique is simple, and synthesis temperature is low, generated time is short, and building-up process is easy to control, favorable repeatability, and the thing phase purity height of synthetic product, particle are tiny evenly.Confirm that through X-ray diffraction (XRD) test synthetic product has single K 2NiF 4Structure.Confirm that through field emission scanning electron microscope (FESEM) test the particle of synthetic product is tiny, even again, granular size is 100～200nm.Adopt the ultra tiny powder of present method synthetic to have good sintering character, can obtain fine and close ceramics sample in 2～8 hours at 1300～1600 ℃ of following sintering.Present method synthetic product can be used in aspects such as intermediate temperature solid oxide fuel cell negative electrode, electrochemical sensor, oxygen separation membrane, and application prospect is good.
Description of drawings
Fig. 1 is the La of embodiment 1 2NiO 4+ δThe XRD figure spectrum of superfine powder.
Fig. 2 is the La of embodiment 1 2NiO 4+ δThe FESEM photo of superfine powder.
Fig. 3 is for adopting the La of embodiment 1 2NiO 4+ δThe SEM photo of the prepared ceramics sample of superfine powder.
Fig. 1 explanation: the equal and La of the position of each diffraction peak and relative intensity in the XRD figure of synthetic product 2NiO 4+ δStandard JCPDS card (80-1346) consistent, show that synthetic product has single K 2NiF 4Structure.
Fig. 2 explanation: the particle of synthetic powder is approximately spherical, no tangible agglomeration between particle, and grain graininess is even, and the particulate mean particle size is about 100nm.
Fig. 3 explanation: adopt the microstructure densification of the synthetic prepared ceramics sample of powder, grain size is about 1 μ m.
Embodiment
The invention provides a kind of K of having 2NiF 4The La of structure 2-xSr xNi 1-yMe yO 4+ δ(Me=Co, Cu, Fe or Mn, x=0～1.5, y=0～1, δ is the nonstoichiometry oxygen level) synthetic method of system electronic-ion mixed conductor material, its step that adopts comprises the preparation of precursor solution, the preparation of solid precursor and the preparation of synthetic powder.
The invention will be further described below in conjunction with embodiment, but do not limit the present invention.
Embodiment 1:
(1) preparation of precursor solution: press La 2NiO 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3With basic nickel carbonate NiCO 32Ni (OH) 24H 2O, in the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 1.7: 3 ratio adds diethylenetriamine pentaacetic acid, mixture places beaker and adds proper amount of deionized water, 90 ℃ of following heated and stirred 4 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 120 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 12 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 900 ℃ and be incubated 2 hours, promptly obtain the synthetic powder of black.
Embodiment 2:
(1) preparation of precursor solution: press La 1.8Sr 0.4NiO 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3, Strontium carbonate powder SrCO 3With basic nickel carbonate NiCO 32Ni (OH) 24H 2O, in the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 1.6: 3 ratio adds diethylenetriamine pentaacetic acid, mixture places beaker and adds proper amount of deionized water, 100 ℃ of following heated and stirred 6 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 140 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 8 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 800 ℃ down and be incubated 2 hours, promptly obtain the synthetic powder of black.
Embodiment 3:
(1) preparation of precursor solution: press La 2Ni 0.8Co 0.2O 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3, basic nickel carbonate NiCO 32Ni (OH) 24H 2O and cobaltous carbonate CoCO 3In the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 1.9: 3 ratio adds diethylenetriamine pentaacetic acid, mixed solution places beaker and adds proper amount of deionized water, 80 ℃ of following heated and stirred 8 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 110 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 18 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 950 ℃ down and be incubated 4 hours, promptly obtain the synthetic powder of black.
Embodiment 4:
Except that heat drying in the step 2 24 hours, other is with embodiment 3.
Embodiment 5:
(1) preparation of precursor solution: press La 2Ni 0.7Fe 0.3O 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3, basic nickel carbonate NiCO 32Ni (OH) 24H 2O and ironic hydroxide Fe (OH) 3In the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 2.5: 3 ratio adds diethylenetriamine pentaacetic acid, mixture places beaker and adds proper amount of deionized water, 90 ℃ of following heated and stirred 6 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 120 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 12 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 950 ℃ down and be incubated 6 hours, promptly obtain jade-green synthetic powder.
Embodiment 6:
(1) preparation of precursor solution: press La 2Ni 0.6Cu 0.4O 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3, basic nickel carbonate NiCO 32Ni (OH) 24H 2O and copper carbonate CuCO 3In the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 2.7: 3 ratio adds diethylenetriamine pentaacetic acid, mixture places beaker and adds proper amount of deionized water, 100 ℃ of following heated and stirred 4 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 110 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 16 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 800 ℃ down and be incubated 1 hour, promptly obtain synthetic powder azury.
Embodiment 7:
(1) preparation of precursor solution: press La 2Ni 0.8Mn 0.2O 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3, basic nickel carbonate NiCO 32Ni (OH) 24H 2O and manganous carbonate MnCO 3In the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 1.6: 3 ratio adds diethylenetriamine pentaacetic acid, mixture places beaker and adds proper amount of deionized water, 90 ℃ of following heated and stirred 6 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 130 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 10 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 950 ℃ down and be incubated 2 hours, promptly obtain the synthetic powder of black.
Embodiment 8:
Except that Heating temperature in the step 3 is 1000 ℃ and is incubated 1 hour that other is with embodiment 7.
Embodiment 9:
(1) preparation of precursor solution: press La 1.8Sr 0.2Ni 0.8Co 0.2O 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3, Strontium carbonate powder SrCO 3, basic nickel carbonate NiCO 32Ni (OH) 24H 2O and cobaltous carbonate CoCO 3In the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 2: 3 ratio adds diethylenetriamine pentaacetic acid, mixture places beaker and adds proper amount of deionized water, 100 ℃ of following heated and stirred 4 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 140 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 8 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 900 ℃ down and be incubated 4 hours, promptly obtain the synthetic powder of black.
Embodiment 10:
Except that in the step 1 mixing solutions being carried out 1 hour the heated and stirred, other is with embodiment 9.
Embodiment 11:
(1) preparation of precursor solution: press La 1.7Sr 0.3Ni 0.7Cu 0.3O 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3, Strontium carbonate powder SrCO 3, basic nickel carbonate NiCO 32Ni (OH) 24H 2O and copper carbonate CuCO 3In the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 1.8: 3 ratio adds diethylenetriamine pentaacetic acid, mixture places beaker and adds proper amount of deionized water, 80 ℃ of following heated and stirred 6 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 120 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 12 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 900 ℃ down and be incubated 6 hours, promptly obtain the synthetic powder of black.
Embodiment 12:
(1) preparation of precursor solution: press La 2CuO 4+ δStoichiometric ratio take by weighing a certain amount of lanthanum hydroxide La (OH) 3With copper carbonate CuCO 3In the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is that 2.1: 3 ratio adds diethylenetriamine pentaacetic acid, mixture places beaker and adds proper amount of deionized water, 90 ℃ of following heated and stirred 4 hours, obtains the precursor solution of clear;
(2) preparation of solid precursor: above-mentioned precursor solution is put into thermostatic drying chamber, under 130 ℃,, obtain transparent vitreous state aminopolycanboxylic acid title complex presoma to precursor solution heat drying 10 hours;
(3) preparation of synthetic powder: the solid precursor of gained is placed on the corundum plate sends in the retort furnace, in air atmosphere, be heated to 800 ℃ down and be incubated 4 hours, promptly obtain the synthetic powder of black.
Embodiment 13:
The mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is 3: 3 in the precursor solution.Other is with embodiment 12.
Resulting synthetic powder is analyzed after tested in the foregoing description, and all can obtain the similar result with embodiment 1 (seeing Fig. 1 and Fig. 2): synthetic powder has single K 2NiF 4Structure, powder granule are approximately spherical, no tangible agglomeration between particle, and grain graininess is even, and the particulate mean particle size is about 100～200nm.

Claims (4)

1. the synthetic method of an electron-ion mixed conductor material is characterized in that a kind of K of having 2NiF 4The La of structure 2-xSr xNi 1-yMe yO 4+ δThe synthetic method of electron-ion mixed conductor material in the system, in the molecular formula, Me=Co, Cu, Fe or Mn, x=0～1.5, y=0～1; Described method adopts and comprises the steps:
(1) preparation of precursor solution: according to the stoichiometric ratio of synthetic product, the carbonate or the oxyhydroxide of various components are mixed in deionized water with diethylenetriamine pentaacetic acid, heated and stirred is dissolved carbonate or oxyhydroxide fully, forms the precursor solution of clear;
(2) preparation of solid precursor: the gained precursor solution is carried out heat drying, form transparent vitreous state aminopolycanboxylic acid title complex presoma;
(3) preparation of synthetic powder: the solid precursor to gained is heat-treated, and obtains having single K 2NiF 4The ultra tiny synthetic powder of structure.
2. synthetic method according to claim 1, it is characterized in that in the process of the preparation of precursor solution, its processing condition are: the mol ratio of diethylenetriamine pentaacetic acid and each metal ion species total amount is 1.6～3: 3, under 80～100 ℃, the mixing solutions of the carbonate of various components or oxyhydroxide and diethylenetriamine pentaacetic acid carried out 1～8 hour heated and stirred, make it to dissolve fully, form the precursor solution of clear.
3. synthetic method according to claim 1 and 2 is characterized in that under 100～140 ℃ of temperature, the precursor solution of gained is carried out 4～24 hours heat drying.
4. synthetic method according to claim 1 is characterized in that the solid precursor to gained is heat-treated in retort furnace, and its processing condition are: 800～1000 ℃ of thermal treatment temps, heat treatment time 1～6 hour.
CNB2007100518561A 2007-04-12 2007-04-12 Method for synthesizing electron-ion mixed conductor material Expired - Fee Related CN100482590C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104916850A (en) * 2015-04-27 2015-09-16 上海邦民新能源科技有限公司 Solid oxide fuel cell cathode material and solid oxide fuel cell composite cathode material and preparation method thereof and cell composite cathode preparation method
CN108358248A (en) * 2018-04-10 2018-08-03 武汉理工大学 Ln0.3Sr0.7Fe0.7Cr0.3O3-δThe synthetic method of ion-electron mixed conductor material
CN111403753A (en) * 2020-03-23 2020-07-10 武汉理工大学 La1.8Sr0.2NiO4+-Ce0.8Sm0.2O1.9Preparation method of composite cathode powder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104916850A (en) * 2015-04-27 2015-09-16 上海邦民新能源科技有限公司 Solid oxide fuel cell cathode material and solid oxide fuel cell composite cathode material and preparation method thereof and cell composite cathode preparation method
CN104916850B (en) * 2015-04-27 2017-06-06 上海邦民新能源科技有限公司 Cathode of solid oxide fuel cell material and have its composite cathode material and preparation method thereof and battery composite cathode preparation method
CN108358248A (en) * 2018-04-10 2018-08-03 武汉理工大学 Ln0.3Sr0.7Fe0.7Cr0.3O3-δThe synthetic method of ion-electron mixed conductor material
CN108358248B (en) * 2018-04-10 2020-01-31 武汉理工大学 Ln0.3Sr0.7Fe0.7Cr0.3O3-δSynthesis method of ion-electron mixed conductor material
CN111403753A (en) * 2020-03-23 2020-07-10 武汉理工大学 La1.8Sr0.2NiO4+-Ce0.8Sm0.2O1.9Preparation method of composite cathode powder

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