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A kind of solid oxide fuel cell cathode surface modification method

A fuel cell cathode and solid oxide technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor surface activity and long-term stability, and achieve the effect of inhibiting strontium segregation and improving stability

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a method for modifying the surface of a solid oxide fuel cell cathode, aiming at the problems of poor surface activity and long-term stability of the existing solid fuel cell cathode materials, by using highly active praseodymium cerium oxide Pr x Ce 1-x o 2 Modification of common solid oxide fuel cell SOFC cathode La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ (LSCF) surface, forming an oxide heterostructure to enhance its electrocatalytic activity and long-term stability

Method used

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  • A kind of solid oxide fuel cell cathode surface modification method
  • A kind of solid oxide fuel cell cathode surface modification method
  • A kind of solid oxide fuel cell cathode surface modification method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Pulse laser deposition (PLD) target preparation

[0046] 1) La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) target preparation

[0047] (1) Weigh 12.34g La(NO 3 ) 3 ·6H 2 O, 4.02g Sr(NO 3 ) 2 , 11.64g Co(NO 3 ) 2 ·6H 2 O, 4.04gFe(NO 3 ) 3 ·9H 2 O, 14.64g glycine (Alfa Aesar, USA), were put into a 1L beaker containing 100ml deionized water, and the mixture was stirred with a glass rod for 10 minutes.

[0048] (2) Place the beaker on a magnetic stirrer, put in a 5cm long magnetic spinner, and stir at 190°C for 0.5h until the mixture becomes molten (bubbling). Use long stainless steel tweezers to take out the magnetic spinner, adjust the temperature to 490°C, and then heat until spontaneous combustion to obtain fluffy powder.

[0049] (3) Put it in the crucible, put it into the muffle furnace, and sinter it at 1000℃ for 5h under air atmosphere to obtain La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) powder.

[0050] (4) Prepare a PVB (polyvinyl butyral) alcohol solution with a mass ratio of ...

Embodiment 2

[0070] 1. Pulse laser deposition (PLD) target preparation

[0071] 1) La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) target preparation

[0072] (1) Weigh 12.34g La(NO 3 ) 3 ·6H 2 O, 4.02g Sr(NO 3 ) 2 , 11.64g Co(NO 3 ) 2 ·6H 2 O, 4.04gFe(NO 3 ) 3 ·9H 2 O, 14.64g glycine (Alfa Aesar, USA) was put into a 1L beaker containing 100ml deionized water, and the mixture was stirred with a glass rod for 10 minutes.

[0073] (2) Place the beaker on a magnetic stirrer, put a 5cm-long magnetic spinner, and stir at 200°C for 0.5h until the mixture becomes molten (bubbling). Use long stainless steel tweezers to take out the magnetic spinner, adjust the temperature to 500℃, and then heat until spontaneous combustion to obtain a fluffy powder

[0074] (3) Put it in the crucible, put it into the muffle furnace, and sinter at 1000℃ for 5h in air atmosphere to obtain La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) powder.

[0075] (4) Prepare a PVB (polyvinyl butyral) alcohol solution with a mass ratio of 1:20, weigh...

Embodiment 3

[0095] 1. Pulse laser deposition (PLD) target preparation

[0096] 1) La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) target preparation

[0097] (1) Weigh 12.34g La(NO 3 ) 3 ·6H 2 O, 4.02g Sr(NO 3 ) 2 , 11.64g Co(NO 3 ) 2 ·6H 2 O, 4.04g Fe(NO 3 ) 3 ·9H 2 O, 14.64g glycine (Alfa Aesar, USA), were put into a 1L beaker containing 100ml deionized water, and the mixture was stirred with a glass rod for 10 minutes.

[0098] (2) Place the beaker on a magnetic stirrer, put a 5cm long magnetic spinner, and stir at 200°C for 0.5h until the mixture becomes molten (bubbling). Use long stainless steel tweezers to take out the magnetic spinner, adjust the temperature to 500℃, and then heat until spontaneous combustion to obtain a fluffy powder

[0099] (3) Put it in the crucible, put it into the muffle furnace, and sinter it at 1000℃ for 5h under air atmosphere to obtain La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) powder.

[0100] (4) Prepare a PVB (polyvinyl butyral) alcohol solution with a mass ratio of 1:...

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Abstract

The invention discloses a negative electrode surface modification method of a solid oxide fuel cell. The modification method specifically comprises the steps of synthesizing an LSCF target material, aGDC target material and a praseodymium cerium oxide target material of a pulse laser deposition instrument (PLD) through a combustion method and a high-temperature calcining method, wherein the praseodymium cerium oxide has the chemical formula of Pr<x>Ce<1-x>O<2>, and x is equal to 0-1; depositing SOFC negative electrode material lanthanum strontium cobalt ferrite on a monocrystal substrate electrolyte through the pulse laser deposition instrument, and depositing a nanoscale praseodymium cerium oxide on the surface to be used as a surface modification layer. An electrochemical impedance diagram is tested in a high-temperature air condition to prove that the negative electrode oxygen reduction activity and long-term stability of the lanthanum strontium cobalt ferrite can be obviously improved by virtue of the surface modification layer, thereby achieving significance to guidance of synthesis of the novel negative electrode material and popularization of commercialization of the solidoxide fuel cell.

Description

Technical field [0001] The invention relates to a fuel cell, in particular to a surface-modified solid oxide fuel cell (SOFC) to improve the long-term stability of electrodes and oxygen reduction activity, and belongs to the technical field of batteries. Background technique [0002] For a long period of time in the future, fossil fuels will still be the main source of energy. At present, the traditional methods of using fossil fuels can no longer meet the human demand for safety, efficiency and environmental friendliness. There is an urgent need to find a new way of using fossil fuels, which can efficiently convert chemical energy-thermal energy, environmentally friendly, and without by-products Energy conversion devices and methods. A solid oxide fuel cell (SOFC) is a fuel cell with solid oxide as the electrolyte. It is mainly composed of anode, electrolyte membrane and cathode. Unlike other fuel cells, SOFC has a higher operating temperature (> 800°C), which makes it hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCH01M4/88Y02E60/50
Inventor 陈燕陈惠君李菲刘茜刘江刘美林
Owner SOUTH CHINA UNIV OF TECH