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Cathode material of solid oxide fuel cell in A omission type perovskite structure

A fuel cell cathode and solid oxide technology, which is applied in solid electrolyte fuel cells, fuel cells, battery electrodes, etc., can solve problems such as poor stability, achieve good battery performance, and have a wide range of applications

Inactive Publication Date: 2010-09-29
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF) It has high performance at low temperature (Nature, 2004.431(7005): p.170-173;), but this material has poor stability in CO2 (Applied Catalysis B: Environmental, 2006.66: p .64-71; Applied Catalysis B: Environmental, 2007.76: p.320-327.)

Method used

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  • Cathode material of solid oxide fuel cell in A omission type perovskite structure

Examples

Experimental program
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Embodiment 1

[0021] BaCO 3 ,,Co 2 o 3 ,, Fe 2 o 3 and Nb 2 o 5 According to the stoichiometric ratio Ba 0.92 (Co 0.7 Fe 0.2 Nb 0.1 )O 3-δ Mix, add alcohol and ball mill for 24 hours to obtain the precursor. After the precursor was dried, it was sintered in the air at 1100°C for 6 hours, and the powder was obtained by solid phase synthesis for the outer layer of the battery cathode; the Ba(NO 3 ) 2 , Co(NO 3 ) 2 .6H 2 O, Fe(NO 3 ) 3 .9H 2 O and NbO(C 2 o 4 ) 3 According to the stoichiometric ratio Ba0.92 (Co 0.7 Fe 0.2 Nb 0.1 )O 3-δ Mix, add water to dissolve, add citric acid with the same molar amount of total metal ions, heat and stir at 90°C until it becomes sol or gel, and finally sinter in air at 800°C for 5 hours to obtain nanopowder for battery cathode inner layer. In the following examples, the electrolyte powder in the anode-supported half-cell is obtained by solid-phase synthesis, the anode and the electrolyte are respectively obtained by casting method, ...

Embodiment 2

[0023] BaCO 3 ,,Co 2 o 3 ,, Fe 2 o 3 and Nb 2 o 5 According to the stoichiometric ratio Ba 0.95 (Co 0.6 Fe 0.3 Nb 0.1 )O 3-δ Mix, add alcohol and ball mill for 48 hours to obtain the precursor. After the precursor was dried, it was sintered in the air at 1000°C for 12 hours, and the powder was obtained by solid phase synthesis for the outer layer of the battery cathode; the Ba(NO 3 ) 2 , Co(NO 3 ) 2 .6H 2 O, Fe(NO 3 ) 3 .9H 2 O and NbO(C 2 o 4 ) 3 According to the stoichiometric ratio Ba 0.95 (Co 0.6 Fe 0.3 Nb 0.1 )O 3-δ Mix, add water to dissolve, add citric acid with the same molar amount of total metal ions, heat and stir at 80-100°C until it becomes a sol or gel, and finally sinter at 800°C in air for 5 hours to obtain nanopowder for use in The inner layer of the battery cathode. Fabrication of Ba by coating on NiO-SSZ(500μm) / SSZ(10μm) anode-supported half-cells 0.95 (Co 0.6 Fe 0.3 Nb 0.1 )O 3-δ The cathode is sintered at 900°C for 5 hours. ...

Embodiment 3

[0025] BaCO 3 ,,Co 2 o 3 ,, Fe 2 o 3 and V 2 o 5 According to the stoichiometric ratio Ba 0.99 (Co 0.7 Fe 0.2 V 0.1 )O 3-δ Mix, add alcohol and ball mill for 48 hours to obtain the precursor. After the precursor was dried, it was sintered in air at 1100°C for 24 hours, and the powder was obtained by solid phase synthesis for the outer layer of the battery cathode; the Ba(NO 3 ) 2 , Co(NO 3 ) 2 .6H 2 O, Fe(NO 3 ) 3 .9H 2 O and C 10 o 20 V 2 According to the stoichiometric ratio Ba 0.99 (Co 0.7 Fe 0.2 V 0.1 )O 3-δ Mix, add water to dissolve, add citric acid twice the molar amount of the total metal ions, heat and stir at 80-100°C until it becomes sol or gel, and finally sinter in air at 800°C for 6 hours to obtain nano-pure cathode powder body; the Sm(NO 3 ) 3 .6H 2 O, Ce(NO 3 ) 3 .6H 2 Mix and dissolve O in water, add glycine with 2 times the molar amount of total metal ions, burn at high temperature to obtain precursor powder, and then sinter at...

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Abstract

The invention relates to a cathode material of a solid oxide fuel cell, in particular to an A omission Ba1-z(Co1-x-yFexMy)O3-delta(BCFM, x=0 to 0.9, y=0.1 to 0.5, and z=0.01 to 0.3) perovskite cathode material and application thereof, wherein M is Zr, V, Nb, Ti, W, Mo, Ta or Hf. The invention is characterized in that the Ba omission in introduced in a site A on titanium ore type BaCo1-xFexO3-delta(BCF) materials, high-valence ions are doped in a site B, the cobalt content is reduced, and the molecular formula is Ba1-z(Co1-x-yFexMy)O3-delta. The porous A omission site B high-valence doping perovskite materials prepared by the invention have the advantages of good thermal and chemical stability and high oxygen catalytic activity, and can effectively reduce the cathodic polarization. The BCFM materials singly form an SOFC cathode or form the SOFC cathode with electrolyte materials through being compounded. The cathode is in a nano-micro structure with two layers, wherein the outer layer is in a large-grain loose structure, and the inner layer is in a fine-grain relatively compact structure. The BCFM cathode can be used as the SOFC cathodes with different structures and compositions. The output power of the cell at 650 to 700 DEG C is about 1.0 W / cm<2>.

Description

technical field [0001] The invention relates to a cathode material for a solid oxide fuel cell, specifically a cathode material for a solid oxide fuel cell with an A-vacancy type and a B-site high-valent ion doped perovskite structure, and a cathode and a solid containing the cathode material. Oxide fuel cells. Background technique [0002] The performance of conventional solid oxide fuel cells (SOFCs) is mainly limited by the oxygen reduction process at the cathode. especially in H 2 In an anode-supported cell for fuel, the resistance of the electrolyte and anode is relatively small, and the cathode is highly polarized. ABOs 3 Type (A=Ln (La series elements), Ca, Sr, Ba; B=Cr, Mn, Fe, Co, Ni, Ga, In) perovskite materials have mixed conductivity and can be used as SOFC cathodes. Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ (BSCF) has high performance at low temperature (Nature, 2004.431(7005): p.170-173;), but this material is in CO 2 Medium stability is poor (Applied Catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/12H01M8/1246
CPCY02E60/521Y02E60/525Y02E60/50
Inventor 韩敏芳刘泽杨志宾
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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