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A kind of preparation method of composite cathode material for fuel cell

A composite cathode, fuel cell technology, applied in battery electrodes, preparation/processing of rare earth metal compounds, nanotechnology for materials and surface science, etc. It can reduce the probability of cathode agglomeration, improve the catalytic efficiency, and the preparation process is simple.

Active Publication Date: 2022-05-31
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional electrode preparation process requires high-temperature sintering (900-1200°C), which increases the particle size of the LSCF electrode and reduces the reaction surface area of ​​the electrode.
Nanoscale coated electrodes can be prepared by the impregnation method, but the process is relatively complicated and needs to undergo multiple impregnation-pre-firing processes (Tomov RI, Mitchel-Williams T B, Maher R, et al. The synergistic effect of cobalt oxide and Gd- CeO 2 dual infiltration in LSCF / CGO cathodes[J].Journal of Materials Chemistry A, 2018, 6(12): 5071-5081)
Patent CN 108091885A prepares perovskite oxide or fluorite oxide on the cathode by impregnation method. The method used is to first coat the cathode slurry on the electrolyte, perform high-temperature sintering, and then drop the nitrate solution into the cathode. It has the same complex preparation process as the aforementioned impregnation method, and the phenomenon of uneven impregnation concentration gradient
And the patent CN 102420332A in LaNi 0.6 Fe 0.4 o 3-δ Cathode coated with CeO 2 In order to prepare a Cr poisoning-resistant cathode, the method used is to first coat the cathode slurry on the electrolyte, then perform high-temperature sintering, and then infiltrate the cathode in CeO 2 solution, but it was not uniformly stirred during the infiltration process, and LaNi 0.6 Fe 0.4 o 3-δ The electrode has been sintered at high temperature before coating, and it is easy to have large cathode particles and uneven coating.

Method used

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  • A kind of preparation method of composite cathode material for fuel cell
  • A kind of preparation method of composite cathode material for fuel cell
  • A kind of preparation method of composite cathode material for fuel cell

Examples

Experimental program
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preparation example Construction

[0026] Preparation of LSCF powder:

[0027] (1) 5.1g La (NO 3 ) 3 ·6H 2 O, 1.7g Sr (NO 3 ) 2 , 1.2g Co(NO 3 ) 2 ·6H 2 O, 6.5g Fe(NO 3 ) 3 ·9H 2 O, 11.5g of citric acid, and 11.7g of EDTA powder were added to the beaker, mixed with 500mL of deionized water, and then slowly poured into 24mL of 25% aqueous ammonia solution, and kept stirring to fully dissolve, and pH=5 was measured at this time;

[0028] (2) The stirred colored solution was heated to 300°C again. After the solution was completely transformed into a gel, the solution was put into an oven for drying, and then calcined at 950°C for 5 hours to obtain pure LSCF cathode powder.

[0029] figure 1 is the SEM surface topography of the prepared pure LSCF cathode powder. As shown in the figure, the particle size is uneven, the agglomeration phenomenon is serious, and the dispersion is uneven.

Embodiment 1

[0030] Example 1 Preparation of LSCF / GDC composite powder

[0031] (1) Weigh 0.02g (4.6×10 -5 mol) Gd (NO 3 ) 3 ·6H 2 O, 0.22g (4.8×10 -4 mol) Ce (NO 3 ) 3 ·6H 2 O, 0.33g (1.7×10 -3 mol) citric acid, 0.33g (1.1×10 -3 mol) EDTA in a beaker, pour 100 mL of deionized water, slowly pour 0.7 mL of 25% ammonia solution, and keep stirring at room temperature to fully dissolve it, and the pH of the solution is detected to be 6;

[0032] (2) Heating and stirring the obtained pale yellow solution at 180°C, adding a certain amount of LSCF cathode powder when the residual water reaches 50 mL, then keeping the temperature unchanged, stirring and mixing to obtain a black bulky cathode precursor gel;

[0033] (3) Put the obtained precursor gel in a 180°C oven to dry for 10 hours, then take out the bulk precursor and grind it into powder, put it into a crucible, and calcine it in a high-temperature furnace at 750°C for 2 hours, and then take it out and grind it. Fine, 10wt% GDC-coat...

Embodiment 2

[0035] Example 2 Preparation of LSCF / GDC composite powder

[0036] (1) Weigh 0.04g (9.2×10 -5 mol) Gd (NO 3 ) 3 ·6H 2 O, 0.44g (9.6×10 -4 mol) Ce (NO 3 ) 3 ·6H 2 O, 0.66g (3.4×10 -3 mol) citric acid, 0.68g (2.2×10 -3 mol) EDTA in a beaker, pour 200 mL of deionized water, slowly pour 0.14 mL of ammonia aqueous solution (concentration of 25%), and keep stirring at room temperature to fully dissolve it. The pH value of the detected solution is 6;

[0037] (2) Heating and stirring the obtained pale yellow solution at 180°C, adding a certain amount of LSCF cathode powder when the residual water reaches 50 mL, then keeping the temperature unchanged, stirring and mixing to obtain a black bulky cathode precursor gel;

[0038] (3) Put the obtained precursor gel in a 180°C oven to dry for 10 hours, then take out the bulk precursor and grind it into powder, put it into a crucible and calcine it in a high temperature furnace at 750°C for 2 hours, then take it out and grind it fin...

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Abstract

The invention discloses a method for preparing a composite cathode material for a fuel cell, and belongs to the technical field of fuel cell electrode material preparation. It is through Gd z Ce 1‑z o 2 (z is 0~1) Composite enhanced La x Sr 1‑x co y Fe 1‑y o 3‑δ (x is 0~1, y is 0~1) performance. The cathode particle obtained by the invention has a greater improvement on the original structure and can exhibit significantly high catalytic activity. The preparation material of the invention is simple and easy to obtain, the process is stable, and the requirements of industrial production can be met.

Description

technical field [0001] The invention belongs to the technical field of preparation of fuel cell electrode materials, and in particular relates to an efficient preparation method of a composite cathode material for fuel cells. Background technique [0002] A fuel cell is an electrochemical power generation device that can efficiently and cleanly convert fuel chemical energy into electrical energy. Among them, solid oxide fuel cells (SOFC) have unique advantages, such as the use of all-solid-state ceramic devices, without electrolyte corrosion. , leakage phenomenon; modular design can also be used, reducing design and production costs. The cathode is an important component of SOFC, and the performance of SOFC is closely related to the catalytic activity, electrical conductivity and microstructure of the cathode. An ideal high-performance cathode should have excellent electrochemical catalytic activity, high electrochemical reaction area, and good electronic and ionic mixed co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/90C01F17/10C01F17/235C01F17/241C01G51/00B82Y30/00B82Y40/00
CPCH01M4/88H01M4/8657H01M4/9033C01G51/40C01G51/006B82Y30/00B82Y40/00C01P2004/80C01P2002/72C01P2004/03C01P2006/40Y02E60/50
Inventor 陈孔发蒋文俊逄舒淇江丽贞邵艳群王欣唐电
Owner FUZHOU UNIV
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