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Microemulsion method for preparing nanometer cathode Ln2NiO4 of solid oxide fuel cell

A solid oxide and fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor chemical stability and high polarization resistance, and achieve simple and easy preparation methods, good chemical compatibility and stability Effect

Inactive Publication Date: 2014-12-17
HEILONGJIANG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor chemical stability and high polarization resistance of cathode materials in existing solid oxide fuel cells

Method used

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  • Microemulsion method for preparing nanometer cathode Ln2NiO4 of solid oxide fuel cell
  • Microemulsion method for preparing nanometer cathode Ln2NiO4 of solid oxide fuel cell
  • Microemulsion method for preparing nanometer cathode Ln2NiO4 of solid oxide fuel cell

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specific Embodiment approach 1

[0017] Specific embodiment 1: In this embodiment, the microemulsion method is used to prepare the nanoscale cathode Ln for solid oxide fuel cells 2 NiO 4 The method is implemented in the following steps:

[0018] 1. Mix 5-20mL oil phase, 2-8g surfactant and 0.5-3mL co-surfactant, stir evenly and divide into solution A and solution B;

[0019] 2. Dissolve 1.0-8.0g of soluble rare earth nitrate and 0.5-2.5g of nickel nitrate in 10-100mL of deionized water, stir well and add to solution A to obtain microemulsion A;

[0020] 3. Dissolve KOH or NaOH in deionized water to form a strong alkali solution with a concentration of 0.5-1.0 mol / L, and then add it to solution B to obtain microemulsion B;

[0021] 4. Mix microemulsion A and microemulsion B under stirring conditions, control the temperature of the mixed solution at 20-40°C, stir and react for 2-6 hours, then let stand for 1-5 hours, then centrifuge and wash to obtain Solid phase, the solid phase is sintered at a rate of 5-1...

specific Embodiment approach 2

[0025] Embodiment 2: This embodiment differs from Embodiment 1 in that step 1 mixes 5 mL of cyclohexane, 5 g of sodium dodecylbenzenesulfonate and 3 mL of isoamyl alcohol. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that step 3 dissolves 1 g of KOH in 20 mL of deionized water. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a microemulsion method for preparing nanometer cathode Ln2NiO4 of a solid oxide fuel cell, which relates to a preparation method of cathode material Ln2NiO4 of a solid oxide fuel cell, and aims to solve the problems of poor chemical stability and high polarization resistance of a cathode material of an existing solid oxide fuel cell. The preparation method comprises the following steps of: (1) mixing and stirring an oil phase, a surface active agent and a cosurfactant to obtain a solution, and dividing the solution into two equal parts; (2) dissolving soluble lanthanide nitrate and nickel nitrate in water, and adding an obtained solution into a solution obtained in the step (1); (3) dissolving alkali into water, and adding an obtained alkali solution into the other solution obtained in the step (1), thereby obtaining microemulsion; and (4) mixing the two microemulsion, centrifuging and washing the microemulsion to obtain a solid-phase matter, and sintering the solid-phase matter at a high temperature to obtain the nanometer cathode Ln2NiO4. The polarization resistance of the nanometer cathode Ln2NiO4 is 0.5ohm.cm<2>, and the chemical stability of the nanometer cathode Ln2NiO4 is good. The microemulsion method provided by the invention is mainly applied to cathodes of solid oxide fuel cells.

Description

technical field [0001] The invention belongs to the field of cathode materials for chemical power source solid oxide fuel cells, in particular to a cathode material Ln for solid oxide fuel cells 2 NiO 4 method of preparation. Background technique [0002] As a new type of energy conversion device, solid oxide fuel cell is attracting more and more attention from various countries because of its advantages of high efficiency and cleanliness. Conventional solid oxide fuel cells suffer from poor stability and short lifetime due to their high operating temperature. The reduction of the operating temperature of the battery will cause a rapid decline in the performance of the electrode, and the performance of the cathode material directly affects the quality of the entire battery system. [0003] The preparation of cathode materials with nanostructures can increase the oxygen diffusion performance on the cathode reaction interface, increase the electrocatalytic activity of catho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 李强赵辉孙丽萍霍丽华高山
Owner HEILONGJIANG UNIV
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