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Preparation method of composite cathode material for fuel cell

A composite cathode, fuel cell technology, applied in battery electrodes, nanotechnology for materials and surface science, chemical instruments and methods, etc. Probability of cathode agglomeration, improvement of cathode performance, effect of simple preparation process

Active Publication Date: 2020-05-12
FUZHOU UNIV
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  • Summary
  • 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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  • Preparation method of composite cathode material for fuel cell
  • Preparation method of composite cathode material for fuel cell
  • 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) Put 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 Add O, 11.5g of citric acid, and 11.7g of EDTA powder into a beaker, mix with 500mL of deionized water, then slowly pour 24mL of 25% aqueous ammonia solution, keep stirring to make it fully dissolved, and the measured pH=5;

[0028] (2) Reheat the stirred colored solution to 300°C, and after the solution is completely transformed into a gel, it is placed in an oven to dry, and then calcined at 950°C for 5 hours to obtain pure LSCF cathode powder.

[0029] figure 1 It 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) Put EDTA in a beaker, pour 100 mL of deionized water, slowly pour 0.7 mL of 25% ammonia solution, and stir continuously at room temperature to make it fully dissolved. The pH of the test solution is 6;

[0032] (2) Heat and stir the obtained light yellow solution at 180°C, add a certain amount of LSCF cathode powder when the moisture remains to 50mL, then keep the temperature constant, stir and mix to obtain a black bulky cathode precursor gel;

[0033] (3) Put the obtained precursor gel in an oven at 180℃ to dry for 10 hours, then take out the massive precursor and grind it into powder, then put it into a crucible, calcinate in a high-temperature furnace at 750℃ for 2 hours, and then take it out for grinding Fine, can get 10wt% GDC coated LSCF ion-enhanced fuel cell ...

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) Put EDTA in a beaker, pour 200mL of deionized water, slowly pour 0.14mL of ammonia solution (concentration of 25%), keep stirring at room temperature to make it fully dissolved, and the pH of the test solution is 6;

[0037] (2) Heat and stir the obtained light yellow solution at 180°C, add a certain amount of LSCF cathode powder when the moisture remains to 50mL, then keep the temperature constant, stir and mix to obtain a black bulky cathode precursor gel;

[0038] (3) Put the obtained precursor gel into an oven at 180°C and dry it for 10 hours, then take out the massive precursor and grind it into powder, put it into a crucible, and calcinate it in a high-temperature furnace at 750°C for 2 hours, and then remove it for fine grinding. The LSCF ion-enhanced fuel cell...

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Abstract

The invention discloses a preparation method of a composite cathode material for a fuel cell, and belongs to the technical field of preparation of fuel cell electrode materials. The performance of LaxSr<1-x>CoyFe<1-y>O<3-delta> (x is 0-1, and y is 0-1) is compositely enhanced through GdzCe<1-z>O2 (z is 0-1). The cathode particles obtained by the invention greatly improve the original structure, and can show significant high catalytic activity. The preparation raw materials are simple and easy to obtain, the process is stable, and the requirement of industrial production can be met.

Description

Technical field [0001] The invention belongs to the technical field of fuel cell electrode material preparation, and in particular relates to a method for preparing a highly efficient composite cathode material for fuel cells. Background technique [0002] 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 cell (SOFC) has unique advantages, such as the use of all-solid ceramic devices, which will not cause electrolyte corrosion , Leakage phenomenon; modular design can also be adopted, reducing design and production costs. The cathode is an important component of the SOFC, and the performance of the SOFC is closely related to the catalytic activity, conductivity and microstructure of the cathode. The ideal high-performance cathode needs to have excellent electrochemical catalytic activity, high electrochemical reaction area, and good electronic conductivity and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/90C01F17/00C01G51/00B82Y30/00B82Y40/00
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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