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BaFeO3-theta-base B-site Bi2O3 doping solid oxide fuel cell cathode material as well as preparation method and application thereof

A fuel cell cathode and solid oxide technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve unconsidered problems and achieve improved structural stability, good oxygen reduction catalytic activity, and good thermal expansion coefficient matching Effect

Inactive Publication Date: 2014-08-13
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] After searching the prior art, it was found, such as A Comparative Study of Oxygen Reduction Reaction on Bi-and La-Doped SrFeO 3-δ Perovskite Cathodes (Bi and La doped SrFeO 3-δ Comparative study on the oxygen reduction reaction of perovskite cathode, Journal of the Electrochemical Society, 2011, 158 (2) B132-B138. 3-δ Perovskite cathode conducts Bi at the A site 2 o 3 and La 2 o 3 The effect of doping on the catalytic activity of oxygen reduction, but the effect on BaFeO 3-δ Perovskite cathode conducts Bi at the B site 2 o 3 Effect of doping on the catalytic activity of oxygen reduction
CN102208663A discloses BaFeO doped with B-site of transition metal element 3-δ base ABO 3 Type perovskite fuel cell cathode material and its application, for BaFeO 3-δ The perovskite cathode is doped with metal elements at the B site, such as Ti, V, Cr, Mn, Ni, Cu, Zn, Zr, Nb, Mo, but the Bi site is not Bi 2 o 3 Doping for Oxygen Reduction Catalytic Activity

Method used

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  • BaFeO3-theta-base B-site Bi2O3 doping solid oxide fuel cell cathode material as well as preparation method and application thereof
  • BaFeO3-theta-base B-site Bi2O3 doping solid oxide fuel cell cathode material as well as preparation method and application thereof
  • BaFeO3-theta-base B-site Bi2O3 doping solid oxide fuel cell cathode material as well as preparation method and application thereof

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Embodiment 1

[0042] This embodiment provides a perovskite-type cathode material used in a medium-low temperature solid oxide fuel cell, whose chemical formula is BaFe 1-x Bi x o 3-δ , where δ represents oxygen excess or deficiency, -1≤δ≤1, x represents Bi 2 o 3 The amount of doping, 0≤x≤0.5.

[0043] The cathode material used by the solid oxide fuel cell represented by the above chemical formula is B-site Bi 2 o 3 Doped BaFO with perovskite crystal structure 3-δ , by Bi 2 o 3 The doping of doping improves the electrochemical performance, in order to prepare SOFC cathode materials with stable structure and suitable thermal expansion coefficient.

Embodiment 2

[0045] This embodiment provides a preparation and characterization method of the above-mentioned medium and low temperature solid oxide fuel cell cathode material, which specifically includes the following steps:

[0046] Step 1: according to the chemical formula of the material, weigh metal nitrate barium nitrate, iron nitrate and bismuth nitrate in stoichiometric formula ratio respectively as raw materials, and weigh a certain amount of ethylenediaminetetraacetic acid (EDTA) and citric acid as complex Mixture, the molar ratio of ethylenediaminetetraacetic acid: citric acid: metal ion is 1:1~2:1~2.

[0047] Step 2: dissolving ferric nitrate in a certain amount of distilled water to prepare a clear solution, dissolving EDTA in a certain amount of dilute ammonia solution to form a clear solution, dissolving the weighed bismuth nitrate with nitric acid solution to form a clear solution for later use.

[0048] Step 3: Add the ammonia solution of EDTA into the ferric nitrate solut...

Embodiment 3

[0053] This embodiment provides a BaFe 0.7 Bi 0.3 o 3-δ The scheme of preparation and performance characterization, specifically includes the following experimental steps:

[0054] Step 1: Take by weighing 10.454 grams of analytically pure barium nitrate, 11.312 grams of iron nitrate and 5.821 grams of bismuth nitrate, and simultaneously weigh the organic complexing agent according to the ratio of EDTA: citric acid: metal ion=1: 1.5: 1 23.379 grams of ethylenediamine tetraacetic acid, 25.217 grams of citric acid.

[0055] Step 2: Dissolve ferric nitrate with 100mL distilled water to form a reddish-brown solution; dissolve ethylenediaminetetraacetic acid with 30mL dilute ammonia water (the volume ratio of ammonia water and distilled water is 1:1) to form a transparent and clear EDTA-ammonia solution; Nitric acid (the volume ratio of nitric acid and distilled water is 2:1) dissolves bismuth nitrate to form a transparent and clear bismuth nitrate solution.

[0056] Step 3: Ad...

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Abstract

The invention discloses a BaFeO3-theta-base B-site Bi2O3 doping solid oxide fuel cell cathode material as well as a preparation method and an application thereof. The constitutional molecular formula of the cathode material is BaFe<1-x>BixO<3-theta>, wherein theta indicates the excessive oxygen quantity or the shortage quantity of oxygen, theta is more than or equal to minus 1 and less than or equal to 1, x indicates the doping quantity of Bi2O3, and x is more than or equal to 0 and less than or equal to 0.5. The BaFeO3-theta-base B-site Bi2O3 doping solid oxide fuel cell cathode material can be synthesized in a solid reaction method and also can be synthesized in a sol-gel method. The invention also provides an application of BaFe<1-x>BixO<3-theta> in a low-temperature solid oxide fuel cell. A BaFeO3-theta perovskite cathode material is doped with Bi2O3 on B site, so that the electrochemical performance of the material can be improved, and the SOFC (solid oxide fuel cell) cathode material with good electrochemical performance, stable structure and appropriate heat expansion coefficient can be obtained.

Description

technical field [0001] The present invention relates to a kind of cathode material of solid oxide fuel cell and its preparation method and application, in particular to a kind of material containing doped Bi 2 o 3 Cobalt-free BaFeO 3-δ Cathode materials based on perovskite oxides and their preparation methods and applications. Background technique [0002] Fuel cell is an electrochemical energy conversion device that can directly convert chemical energy into electrical energy. It has the advantages of cleanness, quietness, and high efficiency. It is considered to be one of the most effective technologies to solve the environmental pollution caused by fossil fuels. Among various types of fuel cells, solid oxide fuel cells (SOFC) have outstanding advantages, such as all-solid structure, easy to move and transport, waste heat during operation can be recycled again, and the fuel has a wide range of applications. [0003] Since a typical SOFC needs to operate in a high tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88H01M8/12
CPCY02E60/521Y02E60/525H01M4/9033H01M8/12Y02E60/50
Inventor 乐士儒孙克宁罗燕关丽丽朱晓东
Owner HARBIN INST OF TECH
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