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A method of improving stability of a perovskite oxide cathode

A perovskite oxide, perovskite technology, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of reduced battery performance and reduced oxygen reduction sites, so as to improve battery performance and improve cathodes The effect of degradation and stability improvement

Inactive Publication Date: 2017-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Co / Fe-based perovskite cathodes will degrade after long-term operation of the battery, and the higher the operating temperature, the more obvious the degradation will be (Electrochem.Solid State Lett.9(10)(2006)A478)
Some scholars believe that the degradation of Co and Fe-based perovskite materials is mainly related to the enrichment of Sr on the surface of the material, which significantly reduces the oxygen reduction sites on the surface of the material and significantly reduces the performance of the battery (Phy.Chem.Chem.Phy.2013,15,489 -496)

Method used

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Embodiment 1

[0019] La was synthesized by ammonium citrate method 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ Cathode powder, where La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ Take 0.05mol. Weigh 12.9872gLa(NO 3 ) 3 ·6H 2 O (analytical pure), 4.2325gSr (NO 3 ) 2 (analytical pure), 2.9105gCo(NO 3 ) 2 ·6H 2 O (analytical pure), 16.16gFe (NO 3 ) 3 9H 2 O (analytical pure) was added into a beaker with deionized water and stirred to dissolve it completely. Then add 36.483g ammonium citrate (analytical pure) according to the ratio of ammonium citrate: metal ion molar ratio of 1.5:1, adjust the pH=9 of the solution with ammonia water (analytical pure) to make the solution clear and transparent, then heat and stir to evaporate the solvent Pour the solution into an evaporating dish until the solution becomes viscous and sol-like, heat it with an electric furnace to make the system self-propagating and burn, collect the primary powder and roast it in a muffle furnace at 1000°C, and use XRD to character...

Embodiment 2

[0021] Co-synthesis of La by ammonium citrate method 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ / Gd 0.1 Ce 0.9 o 1.95 =50:50wt% composite cathode impregnated nanoparticles, where Gd 0.1 Ce 0.9 o 1.95 Take 0.025mol. Weigh 0.4531gGd 2 o 3 Powder (analytical pure), in a 250ml beaker, add HNO 3 (analytical pure) after stirring to dissolve it completely, weigh 6.5486g Ce(NO 3 ) 3 ·6H 2 O (analytical pure), 5.0409gLa (NO 3 ) 3 ·6H 2 O (analytical pure), 1.6429gSr (NO 3 ) 2 (analytical pure), 1.1297gCo(NO 3 ) 2 ·6H 2 O (analytical pure), 6.2724gFe (NO 3 ) 3 9H 2 O (analytical pure) was added into a beaker with deionized water and stirred to dissolve it completely. Then according to ammonium citrate: the ratio of metal ion mol ratio is 1.5:1 to add 23.2814g ammonium citrate (analytically pure), adjust the pH=1 of solution with nitric acid (analytical pure) to make the solution become clear and transparent, and the solution is settled at 100ml volumetric flask.

Embodiment 3

[0023] La prepared as in Example 1 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ Powder, after grinding, add 50wt% cathode paste (the composition of the added glue is a terpineol (90wt%) solution that dissolves ethyl cellulose (10wt%).) Configure the cathode slurry, and coat 0.0080g to Gd 0.1 Ce 0.9 o 1.95 After sintering on the interlayer at 900°C for 2 hours, use a microliter syringe to take 3uL of the solution prepared in Example 2 and dip it into La 0.6 Sr 0.4 co 0.2Fe 0.8 o 3-ζ In the cathode, bake at 800°C for 2 hours to make the impregnating solution phase, and then test it on the self-assembled battery evaluation device at 700°C, 1A / cm 2 Constant current discharge at current density. figure 2 SEM image of the cross-section of the cathode after firing.

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Abstract

A method of improving stability of a perovskite oxide cathode is provided. The method includes impregnating a Co / Fe based perovskite cathode with a perovskite / fluorite-phased composite precursor solution by adopting an ammonium citrate co-synthesis process, and performing calcination at a low temperature that is 800 DEG C to obtain perovskite / fluorite-phased composite nanometer particles. The composite nanometer particles have the perovskite and a cubic fluorite phase, are mixed ion-electron conductors, and are low in particle dimension and uniformly distributed in the cathode. Compared with a battery not impregnated, the battery after impregnation has significantly improved performance, and stability after long-term running for 500 h is obviously improved.

Description

[0001] Technical field: [0002] The invention relates to a solid oxide fuel cell cathode, in particular to a method for improving the long-term operation stability of a solid oxide fuel cell [0003] Background technique: [0004] Solid oxide fuel cells (SOFCs) are energy conversion devices that directly convert chemical energy stored in fuels and oxidants into electrical energy. Compared with traditional energy production technologies, they have high production efficiency, clean and pollution-free, and a wide range of applications. It is one of the most promising clean energy technologies at present. Reducing the operating temperature of SOFC to below 800°C is based on the fact that cheap stainless steel can be used as the connector to reduce the operating cost of SOFC; and it can suppress the reaction between the various components of the battery and solve the problems of sealing and thermal degradation of battery components, so it has become the main development direction o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/126
CPCH01M8/126H01M2008/1293Y02E60/50
Inventor 程谟杰尚磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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