CN108550874B - Cerium oxide-barium cerate-based solid oxide fuel cell electrolyte and preparation method thereof - Google Patents
Cerium oxide-barium cerate-based solid oxide fuel cell electrolyte and preparation method thereof Download PDFInfo
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 54
- 239000000446 fuel Substances 0.000 title claims abstract description 16
- 239000007787 solid Substances 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- XMHIUKTWLZUKEX-UHFFFAOYSA-N hexacosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O XMHIUKTWLZUKEX-UHFFFAOYSA-N 0.000 title description 8
- RKMSYLGAZSHVGJ-UHFFFAOYSA-N barium(2+) cerium(3+) oxygen(2-) Chemical compound [O-2].[Ba+2].[Ce+3] RKMSYLGAZSHVGJ-UHFFFAOYSA-N 0.000 title description 3
- 239000002131 composite material Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 6
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 4
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 8
- 238000000498 ball milling Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 101150058765 BACE1 gene Proteins 0.000 claims 1
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims 1
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims 1
- 239000008187 granular material Substances 0.000 claims 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 abstract description 8
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 abstract description 8
- 229910052788 barium Inorganic materials 0.000 abstract description 6
- 229910052692 Dysprosium Inorganic materials 0.000 abstract description 3
- 229910052691 Erbium Inorganic materials 0.000 abstract description 3
- 229910052693 Europium Inorganic materials 0.000 abstract description 3
- 229910052779 Neodymium Inorganic materials 0.000 abstract description 3
- 229910052769 Ytterbium Inorganic materials 0.000 abstract description 3
- 238000005469 granulation Methods 0.000 abstract description 3
- 230000003179 granulation Effects 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 238000000748 compression moulding Methods 0.000 abstract 1
- 238000003837 high-temperature calcination Methods 0.000 abstract 1
- 238000003746 solid phase reaction Methods 0.000 abstract 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 8
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 8
- 238000010304 firing Methods 0.000 description 7
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 6
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 6
- 229910002761 BaCeO3 Inorganic materials 0.000 description 5
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 description 3
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 3
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 229910001938 gadolinium oxide Inorganic materials 0.000 description 2
- 229940075613 gadolinium oxide Drugs 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 238000010406 interfacial reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- -1 oxygen ion Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/08—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
本发明涉及一种氧化铈‑铈酸钡基固体氧化物燃料电池电解质及制备方法，电解质的主要成分是Ce0.8Bi x Re(0.2‑x)O2‑δ‑BaCe0.8Bi x Re(0.2‑x)O3‑δ(0≤x≤0.2)，其中Re为La、Nd、Eu、Gd、Dy、Er、Yb中的一种。采用固相反应法一次合成Ce0.8Bi x Re(0.2‑x)O2‑δ‑BaCe0.8Bi x Re(0.2‑x)O3‑δ复合粉体，经过造粒、压制成型、高温煅烧，制备出复合电解质。该电解质具有烧成温度低和离子电导率高的优点，该工艺具有简单高效和便于产业化的优点。The invention relates to a ceria-barium ceria-based solid oxide fuel cell electrolyte and a preparation method. The main component of the electrolyte is Ce 0.8 Bi x Re (0.2- x ) O 2-δ -BaCe 0.8 Bi x Re ( 0.2- x ) x ) O 3‑δ (0≤x≤0.2), wherein Re is one of La, Nd, Eu, Gd, Dy, Er, and Yb. Ce 0.8 Bi x Re (0.2- x ) O 2-δ -BaCe 0.8 Bi x Re (0.2- x ) O 3-δ composite powder was synthesized by solid-phase reaction method at one time, after granulation, compression molding, high temperature calcination, A composite electrolyte was prepared. The electrolyte has the advantages of low sintering temperature and high ionic conductivity, and the process has the advantages of simplicity, high efficiency and easy industrialization.
Description
Technical Field
The invention relates to the field of electrolytes of solid oxide fuel cells, in particular to a cerium oxide-barium cerate-based electrolyte of a solid oxide fuel cell and a preparation method thereof.
Background
Solid Oxide Fuel Cells (SOFCs) have become a hot point of research in the fuel cell field due to their advantages such as high energy conversion, no pollution, and fuel diversity. Electrolytes are key and core materials for SOFCs. Currently, YSZ (yttria doped zirconia) is the most developed of the mature SOFCs electrolyte materials. However, YSZ generally has a high ionic conductivity above 1000 ℃, and excessively high operating temperatures cause SOFCs to have a series of problems, such as: reduced electrode activity, high requirements for connector materials, poor battery sealing, etc. Therefore, lowering the operating temperature of SOFCs is an important development to expand the range of battery pack material choices and improve the long-term battery operating stability. However, as the operating temperature decreases, the conductivity of the YSZ electrolyte rapidly decreases, resulting in a sharp decrease in battery performance. The development of new electrolytes for intermediate-temperature solid oxide fuel cells is the current direction of intense research.
Chinese patent document CN101000966 discloses 'a composite doped cerium oxide electrolyte and a preparation method thereof', wherein the composite doped cerium oxide electrolyte is in accordance with Ce1-xGdx-yYyO2-0.5xThe composite oxide of cerium oxide, gadolinium oxide and yttrium oxide in stoichiometric ratio has an electrical conductivity of 0.038S-cm at 600 deg.C in air-1. Chinese patent document CN102544559A discloses "a cerium oxide-based electrolyte for solid oxide fuel cell and a preparation method thereof", wherein the firing temperature is reduced by adding lanthanum oxide and vanadium oxide to cerium oxide, and the electrolyte has an electrical conductivity of 0.0178S-cm at 600 ℃ in air-1. However, Ce in the cerium oxide-based electrolyte4+Is easy to be partially reduced into Ce under low oxygen partial pressure or reducing atmosphere3+Electron conductance is generated, resulting in a drop in the open circuit voltage of the SOFCs, which in turn results in reduced battery performance.
Chinese patent document CN103086716A discloses a composite proton conductor material based on rare earth oxide doped barium cerate and a preparation method thereof, wherein the electrolyte is gadolinium oxide or yttrium oxide doped barium cerate, and the conductivity of the electrolyte is higher than 10 under the condition of 550 ℃ in air-2 S·cm-1. However, barium cerate electrolyte contains CO2、H2O is unstable under the condition and is easy to generate chemical reaction to generate barium carbonate, barium hydroxide and the like, thereby further reducing the conductivity.
Wenping Sun et al (A novel electronic current-blocked stable mixed oxide for solid oxide fuels, Journal of Power Sources, 2011, 196(1): 62-68) describe a rare earth element doped CeO2/BaCeO3The composite electrolyte realizes the complementary performance advantages of the cerium oxide-based electrolyte and the barium cerate-based electrolyte, and solves the problems that the cerium oxide-based electrolyte is easy to be partially reduced and the barium cerate-based electrolyte is unstable in chemistry. However, the firing temperature of the composite electrolyte is high (> 1350 ℃), and an interfacial reaction or element is likely to occur between the two electrolytesThe element diffuses, resulting in lower conductivity.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides Bi-doped Ce0.8Bi x Re x(0.2-)O2-δ- BaCe0.8Bi x Re x(0.2-)O3-δ(x is more than or equal to 0 and less than or equal to 0.2, and Re = La, Nd, Eu, Gd, Dy, Er, Yb and the like) composite electrolyte and a preparation method thereof. The prepared electrolyte has the advantages of low sintering temperature, high conductivity and the like. The preparation method has the advantages of simple process and convenient industrialization.
The invention is realized by the following technical scheme, which comprises the following steps.
1、Ce0.8Bi x Re x(0.2-)O2-δ-BaCe0.8Bi x Re x(0.2-)O3-δThe preparation method of the composite powder is as follows.
1.1 according to Ce0.8Bi x Re x(0.2-)O2-δ-BaCe0.8Bi x Re x)(0.2-O3-δStoichiometric weighing of BaCO3、CeO2、Bi2O3、Re2O3(Re = La, Nd, Eu, Gd, Dy, Er, Yb and the like), putting the mixture into a polyurethane ball milling tank, adding absolute ethyl alcohol, and carrying out ball milling for 8-12 hours by taking zirconia balls as a medium, wherein the mass ratio of the raw materials to the zirconia balls to the absolute ethyl alcohol is 1 (2.5-3.5) to (0.8-0.9), so as to obtain the slurry.
And 1.2, drying, granulating, and pressing and forming under the pressure of 5-15 MPa to obtain a blank.
1.3, putting the blank into a heating furnace, heating to 900-1050 ℃, preserving heat for 10-15 hours, and then cooling along with the furnace.
1.4 crushing the calcined lump material to obtain Ce0.8BixRe(0.2-x)O2-δ-Ba Ce0.8BixRe(0.2-x)O3-δAnd (3) composite powder.
2、Ce0.8BixRe(0.2-x)O2-δ-Ba Ce0.8BixRe(0.2-x)O3-δThe preparation method of the composite electrolyte is as follows.
2.1 to Ce0.8BixRe(0.2-x)O2-δ-Ba Ce0.8BixRe(0.2-x)O3-δAdding 1 wt.% of binder into the composite powder, uniformly mixing, granulating, and pressing under the pressure of 30-60 MPa to prepare a flaky electrolyte blank with the thickness of 0.3-1.5 mm.
2.2, putting the electrolyte blank into a heating furnace, heating to 1100-1250 ℃, and preserving heat for 2-6 hours to obtain the solid oxide fuel cell electrolyte.
The purity of the raw material is more than 99.9 percent; the absolute ethyl alcohol is of analytical pure grade.
Ce of step 1.1 of the invention0.8Bi x Re x(0.2-)O2-δAnd BaCe0.8Bi x Re x)(0.2-O3-δThe mass ratio of (95-50) to (5-50).
Preferred according to the invention, Ce in step 1.10.8Bi x Re x(0.2-)O2-δ-BaCe0.8Bi x Re x)(0.2-O3-δX is more than or equal to 0.05 and less than or equal to 0.12.
In the step 1.2, the drying temperature is 80-100 ℃, and the drying time is 12-15 hours. The mesh number of the granulated powder is 40 meshes.
Preferably according to the invention, the temperature ramp profile in step 1.3 is: heating to 950-1000 ℃ at a speed of 3-6 ℃/min, and preserving heat for 11-13 hours.
The binder in step 2.1 of the present invention is one of a PVA (polyvinyl alcohol) aqueous solution or a PVB (polyvinyl butyral) ethanol solution with a concentration of 5 wt.%.
Preferably, the mesh size of the crushed powder in step 2.1 is 40 meshes.
Preferably, in step 2.1, the thickness of the sheet-like electrolyte sheet is 0.6-1.2 mm.
Preferably according to the invention, the temperature ramp profile in step 1.3 is: heating to 1150-1200 ℃ at a speed of 2-4 ℃/min, and preserving heat for 3-5 hours.
Advantageous effects
1. The firing temperature is low: bi2O3Has a low melting point, Bi is doped so that CeO2/BaCeO3The firing temperature of the composite electrolyte is reduced by more than 100 ℃.
2. High oxygen ion conductivity: doped with single element of undoped Bi with CeO2/BaCeO3Compared with the composite electrolyte, the ionic conductivity is higher than 3 times.
3. The composite doped CeO can be prepared by one-step reaction2/BaCeO3The powder does not need subsequent mixing process, the process flow is simple, and the industrialization is convenient.
Detailed Description
The technical solution of the present invention is further described with reference to the following examples, but the scope of the present invention is not limited thereto.
Example 1
As 90wt.% Ce0.8Bi0.1La0.1O2-δ-10 wt.% BaCe0.8Bi0.1La0.1O3-δStoichiometric weighing of BaCO3、CeO2、Bi2O3、La2O3Putting the mixture into a polyurethane ball milling tank, adding absolute ethyl alcohol, and ball milling for 10 hours by taking zirconia balls as a medium, wherein the mass ratio of the raw materials to the zirconia balls to the absolute ethyl alcohol is 1: 3: 0.8, so as to obtain slurry. Drying at 90 deg.C for 12 hr, sieving with 40 mesh sieve, granulating, and press-forming under 10MPa to obtain blank. And (3) putting the blank into a heating furnace, heating to 1000 ℃ at the speed of 3 ℃/min, preserving heat for 12 hours, and then cooling along with the furnace. Crushing the calcined lump to obtain 90wt.% Ce0.8Bi0.1La0.1O2-δ-10 wt.% BaCe0.8Bi0.1La0.1O3-δAnd (3) composite powder. Adding 1 wt.% of PVA aqueous solution into the composite powder, uniformly mixing, sieving by a 40-mesh sieve, granulating, and pressing under the pressure of 50MPa to prepare a flaky electrolyte blank with the thickness of 1.0 mm. Putting the electrolyte blank into a heating furnace, heating at 3 DEG CHeating to 1150 ℃ in min, and preserving the temperature for 4 hours to obtain the solid oxide fuel cell electrolyte.
90wt.% Ce, tested using an electrochemical workstation (Shanghai Hua, CHI 660E)0.8Bi0.1La0.1O2-δ-10 wt.% BaCe0.8Bi0.1La0.1O3-δThe ionic conductivity of the composite electrolyte at 600 ℃ in air is 0.031S cm-1。
Example 2
As 70wt.% Ce0.8Bi0.1Gd0.1O2-δ-30 wt.% BaCe0.8Bi0.1Gd0.1O3-δStoichiometric weighing of BaCO3、CeO2、Bi2O3、Gd2O3Putting the mixture into a polyurethane ball milling tank, adding absolute ethyl alcohol, and ball milling for 10 hours by taking zirconia balls as a medium, wherein the mass ratio of the raw materials to the zirconia balls to the absolute ethyl alcohol is 1: 3.1: 0.9, so as to obtain the slurry. Drying at 80 ℃ for 15 hours, sieving with a 40-mesh sieve for granulation, and pressing and molding under the pressure of 8MPa to obtain a blank. And (3) putting the blank into a heating furnace, heating to 980 ℃ at the speed of 5 ℃/min, preserving the heat for 13 hours, and then cooling along with the furnace. Crushing the calcined lump to obtain 70wt.% Ce0.8Bi0.1Gd0.1O2-δ-30 wt.% BaCe0.8Bi0.1Gd0.1O3-δAnd (3) composite powder. Adding 1 wt.% PVB ethanol solution into the composite powder, mixing uniformly, sieving with a 40-mesh sieve for granulation, and pressing under 40MPa pressure to obtain a sheet electrolyte blank with the thickness of 0.9 mm. And (3) putting the electrolyte blank into a heating furnace, heating to 1200 ℃ at the speed of 4 ℃/min, and preserving the temperature for 5 hours to obtain the solid oxide fuel cell electrolyte.
Tested using an electrochemical workstation (Shanghai Hua, CHI 660E), 70wt.% Ce0.8Bi0.1Gd0.1O2-δ-30 wt.% BaCe0.8Bi0.1Gd0.1O3-δThe ionic conductivity of the composite electrolyte at 600 ℃ and under the air condition is 0.028S cm-1。
Comparative example 1
As described in example 1, except that: is prepared fromDoping Bi element. Namely: the composition of the composite electrolyte is 90wt.% Ce0.8La0.2O2-δ-10 wt.% BaCe0.8La0.2O3-δ. The firing temperature of the electrolyte was 1300 ℃. The ionic conductivity at 600 deg.C in air is 0.0078S cm-1。
Comparative example 2
As described in example 1, except that: is not doped with Bi element. Namely: the composition of the composite electrolyte is 70wt.% Ce0.8Gd0.2O2-δ-30 wt.% BaCe0.8Gd0.2O3-δ. The firing temperature of the electrolyte was 1350 ℃. The ionic conductivity at 600 deg.C in air is 0.0071S cm-1。
Compared with the comparative examples 1 and 2, the sintering temperature of the examples 1 and 2 is obviously reduced, and the conductivity is improved by more than 3 times. Shows that the doping of Bi element is beneficial to reducing CeO2/BaCeO3The firing temperature of the composite electrolyte is improved, and the ionic conductivity of the composite electrolyte is improved.
It should be noted that the above-mentioned embodiments are merely examples of the present invention, and it is obvious that the present invention is not limited to the above-mentioned embodiments, and other modifications are possible. All modifications directly or indirectly derivable by a person skilled in the art from the present disclosure are to be considered within the scope of the present invention.
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