Preparation method of strontium iron molybdenum based double-perovskite type metal oxide nano-fibers

A double perovskite and nanofiber technology, applied in the direction of inorganic raw materials such as artificial filaments, can solve the problems of refractory solubility, difficulty in maintaining a complete structure of nanofibers, and difficulty in producing electrospinning precursors of metal elements, etc., to achieve structural The effects of integrity, excellent electrochemical performance, high catalytic activity and gas permeability

Active Publication Date: 2018-05-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, when the above method is applied to the preparation of double perovskite metal oxides, especially strontium-iron-molybdenum-based double perovskite metal oxides, the phase formation temperature is generally higher than 900 ° C, and when the calcination temperature is higher than 900 ° C, the electrostatic Nanofibers prepared by spinning will agglomerate and it is difficult to maintain a complete structure
Moreover, the molybdenum source used in the preparation of strontium-iron-molybdenum-based double perovskite metal oxides is generally strontium molybdate, which is insoluble in organic solvents such as N,N-dimethylformamide (DMF), so it is difficult to produce uniform metal elements. Dispersed Electrospinning Precursors

Method used

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  • Preparation method of strontium iron molybdenum based double-perovskite type metal oxide nano-fibers
  • Preparation method of strontium iron molybdenum based double-perovskite type metal oxide nano-fibers
  • Preparation method of strontium iron molybdenum based double-perovskite type metal oxide nano-fibers

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Experimental program
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Embodiment 1

[0034] Sr below 2 Fe 1.1 Cu 0.4 Mo 0.5 o 6 Take an example to further illustrate the synthesis of strontium-iron-molybdenum-based double perovskite metal oxide nanofibers.

[0035] (1) Prepare 0.001mol electrospinning solution. Sr 2 Fe 1.1 Cu 0.4 Mo 0.5 o 6 Nanofiber material using Sr(Ac) 2 , (NH 4 ) 6 Mo 7 o 24 4H 2 O, Fe(NO 3 ) 3 9H 2 O, Cu(Ac) 2 Metal salt is used as raw material, citric acid is used as complexing agent, PVP (K88-96) is used as polymer, and DMF (dimethylformamide) is used as solvent. Accurately weigh the required raw materials according to the stoichiometric ratio.

[0036]

[0037] (2) Dissolve the accurately weighed metal salt and citric acid in 6.4g DMF, stir for 12 hours until the metal salt is completely dissolved; then add PVP polymer to the solution and continue stirring until completely dissolved to obtain a viscous solution.

[0038] (3) Set up the spinning device, inject the completely dissolved spinning solution into the inj...

Embodiment 2

[0041] With the Sr that embodiment 1 makes 2 Fe 1.1 Cu 0.4 Mo 0.5 o 6 (SFCM) as an example to conduct nanofibers in CO 2 The test of the AC impedance curve under the atmosphere.

[0042] The electrolyte support used in the experiment is LSGM (La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 o 3 ), prepared by tableting method. Specific steps are as follows:

[0043] Weigh 0.5g of LSGM powder in a mortar, use a pipette to measure 0.5mL of 5% polyvinyl alcohol (PVA) solution as a binder, and add it to the mortar. Grind until the powder is dry and fine enough. Put the powder into the mold, hold the pressure at 9 MPa for 4 minutes, pressurize to 18 MPa and hold the pressure for 4 minutes to obtain a disc-shaped electrolyte green body, and calcinate it at 1450 ° C for 8 hours to make it dense, and obtain the required LSGM electrolyte support (black circle sheet), and the electrolyte sheet was polished to a thickness of 300 μm, and ultrasonically cleaned for later use.

[0044] The electro...

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Abstract

The invention discloses a preparation method of strontium iron molybdenum based double-perovskite type metal oxide nano-fibers and application of the strontium iron molybdenum based double-perovskitetype metal oxide nano-fibers to middle-low temperature solid oxide fuel cells and solid oxide electrolytic tanks. The preparation method comprises the following steps: synthesizing Sr2Fe1.5-xCuxMo0.5O6 (x is equal to 0.01 to 0.6) precursor fibers; after drying the fibers, calcining the fibers at temperature in a range of 700 DEG C to 800 DEG C for 1 to 3h to obtain the Sr2Fe1.5-xCuxMo0.5O6 (x is equal to 0.01 to 0.6) double-perovskite type metal oxide nano-fibers with the diameter of 50 to 500nm. The nano-fibers disclosed by the invention have the advantages of large specific surface area, abundant active sites, excellent catalytic performance and high conductivity and are applied to electrode materials of the middle-low temperature solid oxide fuel cells and the solid oxide electrolytic tanks, and excellent electrochemical performance can be obtained.

Description

technical field [0001] The present invention relates to the field of solid oxide fuel cells or solid oxide electrolytic cells, in particular to a preparation method of double perovskite metal oxide nanofibers and their application in medium and low temperature solid oxide fuel cells or solid oxide electrolytic cells applications in electrode materials. Background technique [0002] 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 conversio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08
CPCC04B35/62231C04B2235/3213C04B2235/3256C04B2235/3274C04B2235/3281D01F9/08
Inventor 孙旺孙克宁徐春明张宇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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