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Oxide material of iron-based double perovskite structure and preparation method thereof

A double perovskite and oxide technology, applied in the direction of fuel cells, electrochemical generators, final product manufacturing, etc., can solve the problems of high thermal expansion coefficient, high cost of cobalt raw materials, and limited practical applications, etc., to achieve high ion and electronic The effect of electrical conductivity, reduced sintering temperature, and good anti-carbon deposition effect

Active Publication Date: 2020-06-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high coefficient of thermal expansion of this type of material, poor chemical stability, and high cost of cobalt raw materials, the practical application of this type of material is severely limited (LnBaCo 2 o 5+δ Oxides as Cathodes for Intermediate-Temperature SolidOxide Fuel Cells, Journal of The Electrochemical Society, 155(4)(2008)B385-B390)

Method used

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  • Oxide material of iron-based double perovskite structure and preparation method thereof
  • Oxide material of iron-based double perovskite structure and preparation method thereof
  • Oxide material of iron-based double perovskite structure and preparation method thereof

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Embodiment 1

[0065] This embodiment provides an oxide material GdBaFe of a first configuration iron-based double perovskite structure 2 o 5+δ , which was prepared by the following steps:

[0066] (1) Weigh Gd according to the molar ratio Gd:Ba:Fe=1:1:2 2 o 3 , Ba(NO 3 ) 2 and Fe(NO 3 ) 3 9H 2 O, where Gd 2 o 3 Pre-burn at 900°C for 2 hours to remove moisture, and weigh the required amount at 200°C; weigh the obtained Gd 2 o 3 Dissolved in dilute nitric acid to obtain the corresponding nitrate solution, and then mixed with Ba(NO 3 ) 2 and Fe(NO 3 )3 9H 2 The aqueous solution of O was mixed to obtain a mixed solution of three nitrates (referred to as the first mixed solution in Example 1).

[0067] (2) Take complexing agent ethylenediaminetetraacetic acid and citric acid, wherein, the mol ratio of ethylenediaminetetraacetic acid, citric acid and metal ion is 0.7:1.8:0.9, and metal ion refers to Gd 3+ 、Ba 2+ , Fe 3+ The sum of the three is mixed with the above-mentioned firs...

Embodiment 2

[0075] This embodiment provides an oxide material GdBaFe of a first configuration iron-based double perovskite structure 2 o 5+δ , which was prepared by the following steps:

[0076] (1) Weigh Gd according to the molar ratio Gd:Ba:Fe=1:1:2 2 o 3 , Ba(NO 3 ) 2 and Fe(NO 3 ) 3 9H 2 O, where Gd 2 o 3 Pre-burn at 900°C for 2 hours to remove moisture, and weigh the required amount at 200°C. Will weigh the resulting Gd 2 o 3 Dissolve in dilute nitric acid to obtain the corresponding nitrate solution. Then with Ba(NO 3 ) 2 and Fe(NO 3 ) 3 9H 2 The aqueous solution of O was mixed to obtain a mixed solution of three nitrates (referred to as the first mixed solution in Example 2).

[0077] (2) Take complexing agent ethylenediaminetetraacetic acid and citric acid, wherein, the mol ratio of ethylenediaminetetraacetic acid, citric acid and metal ion is 0.9:1.9:1.1, and metal ion refers to Gd 3+ 、Ba 2+ , Fe 3+ The sum of the three. After adding ammonia water to dissolv...

Embodiment 3

[0084] This embodiment provides a second configuration of the iron-based double perovskite structure oxide material GdBaFe 2 o 5+δ , which was prepared by the following steps:

[0085] The GdBaFe prepared by embodiment 1 2 o 5+δ After grinding with alcohol for 1 hour, sintering at 1000°C for 15 hours in a reducing atmosphere to obtain the iron-based double perovskite structure oxide material GdBaFe that can be used as the second configuration of the solid oxide fuel cell anode material 2 o 5+δ , wherein the reducing atmosphere is 3% hydrogen and 97% argon at normal pressure.

[0086] image 3 For the prepared GdBaFe of this embodiment 2 o 5+δ Compared with the standard card in the crystal library, it can be seen that there are no other impurity peaks, indicating that after high temperature sintering, a single-phase iron-based double perovskite structure oxide GdBaFe was obtained under a reducing atmosphere. 2 o 5+δ , and an obvious double-peak splitting phenomenon app...

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Abstract

The invention provides an oxide material of an iron-based double perovskite structure and a preparation method thereof. The material is a layered oxygen vacancy isomeric material with an ordered A position, and the molecular formula is GdBaFe2O5 + delta, wherein the A position is Gd and Ba ordered coexistence. The material synthesized in an oxidizing atmosphere and a reducing atmosphere has different oxygen vacancies, GdBaFe2O5+delta of two different configurations can be obtained by changing synthesis conditions, and a cathode and anode of a solid oxide fuel cell are prepared respectively; and the electrode made of the material can be used as a symmetrical battery electrode. A catalyst prepared from the material can be used for high-temperature cracking of hydrocarbon fuel, and is particularly applied to selective separation of methane and carbon dioxide. The wet chemical preparation method of the material provided by the invention is simple, efficient and wide in material applicability.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to an oxide material with an iron-based double perovskite structure and a preparation method thereof. Background technique [0002] A solid oxide fuel cell (SOFC) is an electrochemical power generation device that directly converts chemical energy into electrical energy. A basic solid oxide fuel cell consists of three main components: cathode, electrolyte and anode, such as figure 1 shown. The cathode of the solid oxide fuel cell works in an oxidizing atmosphere, and its function is to reduce oxygen into oxygen ions, that is, the cathode provides the required place for the electrochemical reduction of the oxidant. This requires cathode materials with good oxygen transport performance and oxygen catalytic activity. For solid oxide fuel cells that use oxygen ion conductors as electrolytes, the cathode must first convert O 2 reduced to O 2－ , then O 2－ Transfer to ...

Claims

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Application Information

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IPC IPC(8): H01M8/1246
CPCH01M8/1246H01M2008/128Y02E60/50Y02P70/50
Inventor 贺天民张赢贺强
Owner BC P INC CHINA NAT PETROLEUM CORP
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