Negative electrode surface modification method of solid oxide fuel cell

A fuel cell cathode and solid oxide technology, which is 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: 2018-08-10
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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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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  • Negative electrode surface modification method of solid oxide fuel cell
  • Negative electrode surface modification method of solid oxide fuel cell
  • Negative electrode surface modification method of solid oxide fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Preparation of pulsed laser deposition (PLD) targets

[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, 4.04g Fe(NO 3 ) 3 9H 2 O, 14.64g glycine (Alfa Aesar, USA) was put into a 1L beaker filled with 100ml deionized water successively, and the mixed solution was stirred for 10min with a glass rod.

[0048] (2) Place the beaker on a magnetic stirrer, put a 5cm long magnetic rotor, and stir at 190°C for 0.5h until the mixture becomes molten (bubbling). The magnetic spinner was taken out with long stainless steel tweezers, the temperature was adjusted to 490 °C, and then heated until spontaneous combustion to obtain a fluffy powder.

[0049] (3) Put it in a crucible, put it into a muffle furnace, and sinter at 1000°C for 5h in an 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 (pol...

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, 4.04g Fe(NO 3 ) 3 9H 2 O, 14.64g glycine (Alfa Aesar, USA) was put into a 1L beaker filled with 100ml deionized water successively, and the mixed solution was stirred for 10min with a glass rod.

[0073] (2) Place the beaker on a magnetic stirrer, put a 5cm long magnetic rotor, 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 ° C, and then heat until it spontaneously ignites to obtain a fluffy powder

[0074] (3) Put it in a crucible, put it into a muffle furnace, and sinter at 1000°C for 5h in an 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...

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) was put into a 1L beaker filled with 100ml deionized water successively, and the mixed solution was stirred for 10min with a glass rod.

[0098] (2) Place the beaker on a magnetic stirrer, put a 5cm long magnetic rotor, 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 ° C, and then heat until it spontaneously ignites to obtain a fluffy powder

[0099] (3) Put it in a crucible, put it into a muffle furnace, and sinter at 1000°C for 5h in an 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...

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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 and oxygen reduction activity of an electrode, 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. The current traditional method of using fossil fuels can no longer meet human needs for energy safety, high efficiency, and environmental friendliness. It is urgent to find a new way to use fossil fuels, which can efficiently convert chemical energy-thermal energy, is environmentally friendly, and has no by-products. Energy conversion device and method. Solid oxide fuel cell (SOFC) is a fuel cell with solid oxide as electrolyte. It is mainly composed of anode, electrolyte membrane and cathode. Unlike other fuel cells, SOFC has a high operating temperature (>800°C), which makes it have the advan...

Claims

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Application Information

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Patent Type & Authority Applications(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
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