Double-perovskite-type anode material and preparation method thereof

An anode material, double perovskite technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of easy decomposition of materials, achieve the effects of reducing costs, improving performance, and improving catalytic activity and electrical conductivity

Active Publication Date: 2014-11-19
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved La doping Sr 2 MgO 6 The problem that the material is easily decomposed in an oxidizing atmosphere makes La x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ Double perovskite anode material becomes a very promising anode material for solid oxide fuel cells

Method used

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  • Double-perovskite-type anode material and preparation method thereof
  • Double-perovskite-type anode material and preparation method thereof
  • Double-perovskite-type anode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Synthesis of La by citric acid-combustion method x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) Dense sample. According to La x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) stoichiometric ratio preparation, Sr(NO 3 ) 2 , La 2 o 3 , Mg(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 O was dissolved in deionized water, and citric acid was added at a ratio of 1:2 between metal ions and citric acid, and stirred continuously to form a uniform solution. Then at 70-90 o C water bath to obtain a homogeneous sol, the sol in an oven for 80 o C to keep dry gel, then 250 o C is heated until it self-combusts to form a very fluffy La x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) precursor powder. Grind the powder and put it into an electric furnace for roasting at a temperature of 800 o C, the holding time is 6 h, so that the organic matter in it can be fully decomposed. The roasted powder was ground and sieved again, a...

Embodiment 2

[0041] Synthesis of La by citric acid-combustion method x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) anode powder. According to La x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) stoichiometric ratio preparation, Sr(NO 3 ) 2 , La 2 o 3 , Mg(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 O was dissolved in deionized water, and citric acid was added at a ratio of 1:2 between metal ions and citric acid, and stirred continuously to form a uniform solution. Then at 70-90 o C water bath to obtain a homogeneous sol, the sol in an oven for 80 o C to keep dry gel, then 250 o C is heated until it self-combusts to form a very fluffy La x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) precursor powder. Grind the powder and put it into an electric furnace for roasting at a temperature of 800 o C, the holding time is 6 h, so that the organic matter in it can be fully decomposed. The powder heat-treated in the electric furnace i...

Embodiment 3

[0043] Synthesis of La by citric acid-combustion method x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) anode powder, and prepare a single battery to test battery performance. According to La x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) stoichiometric ratio preparation, Sr(NO 3 ) 2 , La 2 o 3 , Mg(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 O was dissolved in deionized water, and citric acid was added at a ratio of 1:2 between metal ions and citric acid, and stirred continuously to form a uniform solution. Then at 70-90 o C water bath to obtain a homogeneous sol, the sol in an oven for 80 o C to keep dry gel, then 250 o C is heated until it self-combusts to form a very fluffy La x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ (x=2 / 3, y=1 / 3) precursor powder. Grind the powder and put it into an electric furnace for roasting at a temperature of 800 o C, the holding time is 6 h, so that the organic matter in it can be fully deco...

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Abstract

The invention discloses a double-perovskite-type anode material and a preparation method thereof, and belongs to the technical field of solid oxide fuel batteries. The site Mg and the site Mo of the anode material LaxSr(2-x)MgMoO6 of a double-perovskite (A2BB'O6) solid oxide fuel battery are simultaneously doped with Fe, so that a high-performance and high-stability double-perovskite structured blended conductor material is formed. The molecular formula of the double-perovskite-type anode material is LaxSr(2-x)Mg(1-y)Fe2yMo(1-y)O(6-delta), wherein x is greater than 0 and smaller than 1, y is greater than 0 and smaller than 1, and delta is greater than or equal to 0 and smaller than or equal to 1. The invention also discloses a compact-type anode material and a porous film anode material. The double-perovskite-type anode material has the technical effects that according to a charge compensation principle, the site Mg and the site Mo are simultaneously doped with Fe to achieve charge self-consistency of a material system, so that the redox stability of the material is effectively improved; cheap Fe is selected as a doping element, so that the cost of the material can be lowered; meanwhile, Fe is relatively high in valence change capacity, so that an effective conductive network can be formed on the site B, and the catalysis activity and the conductivity of the material are improved favorably.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, in particular to double perovskite (A 2 BB'O 6 ) Solid oxide fuel cell anode material La x Sr 2-x MgO 6 The Mg site and Mo site of the La x Sr 2-x Mg 1-y Fe 2y Mo 1-y o 6-δ Double perovskite type anode material and preparation method thereof. [0002] Background technique [0003] With the rapid growth of the global population, the intensification of industrialization, and the increasing consumption of energy in various countries, it has become an important direction for the development of the world today to seek new energy technologies with high energy conversion efficiency and environmental friendliness, among which solid oxide fuel cells It is one of the most potential energy technologies. A solid oxide fuel cell is a power generation device that converts chemical energy stored in fuel and oxidant directly into electrical energy. It has the advantages of high conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8647H01M4/8885Y02E60/50
Inventor 赵海雷杜志鸿夏青杨春阳严春林卢瑶方梦雅
Owner UNIV OF SCI & TECH BEIJING
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