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Method for preparing composite cathode materials RBCO-xCGO of SOFC by in-situ colloidal composite method

A technology of solid oxides and fuel cells, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of uneven distribution and poor uniformity of impregnated particles, and achieve the effects of improving preparation performance, preventing agglomeration, and ensuring uniformity

Active Publication Date: 2017-06-16
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor mixing uniformity of the current mechanical mixing method and uneven distribution of impregnated particles by the sol impregnation method, and to provide an in-situ colloidal composite method for preparing solid oxide fuel cell composite cathode material RBCO-xCGO method

Method used

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  • Method for preparing composite cathode materials RBCO-xCGO of SOFC by in-situ colloidal composite method
  • Method for preparing composite cathode materials RBCO-xCGO of SOFC by in-situ colloidal composite method
  • Method for preparing composite cathode materials RBCO-xCGO of SOFC by in-situ colloidal composite method

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specific Embodiment approach 1

[0033] Embodiment 1: The method for preparing solid oxide fuel cell composite cathode material RBCO-xCGO by an in-situ colloidal composite method of the present embodiment is carried out according to the following steps:

[0034] 1. ReBaCo 2 O 6-δ Preparation of precursor sol: Re(NO 3 ) 3 ·6H 2 O, Ba (NO 3 ) 2 and Co(NO 3 ) 3 ·6H 2 After mixing, add deionized water, stir until it is completely dissolved at a temperature of 20-25 °C, and obtain a mixed solution, then add EDTA and citric acid, and stir at a temperature of 20-25 °C until it becomes a homogeneous solution , and then add ammonia water to adjust the pH to 6-6.5 to obtain ReBaCo 2 O 6-δ Precursor sol, wherein Re is a rare earth element;

[0035] Re(NO) described in step 1 3 ) 3 ·6H 2 O and Ba(NO 3 ) 2 The ratio of the amount of substances is 1:1;

[0036] Re(NO) described in step 1 3 ) 3 ·6H 2 O and Co(NO 3 ) 3 ·6H 2 The ratio of the amount of O substances is 1:2;

[0037] Re(NO) described in ...

specific Embodiment approach 2

[0054] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the rare earth element Re in step 1 is La, Pr, Nd, Sm or Gd. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0055] Embodiment 3: The difference between this embodiment and one of Embodiments 1 to 2 is that the Re(NO 3 ) 3 ·6H 2 The ratio of the amount of O substance to the volume of deionized water is 0.007 mol to 0.009 mol: 150 mL. Other steps and parameters are the same as one of the first to second embodiments.

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Abstract

The invention discloses a method for preparing composite cathode materials RBCO-xCGO of SOFC by an in-situ colloidal composite method, belongs to the field of SOFCs, particularly relates to the method for preparing the composite cathode materials RBCO-xCGO of SOFC by the in-situ colloidal composite method, and aims at solving the problems of poor mixing uniformity of the conventional mechanical mixing method and nonuniform distribution of impregnated particles of a sol impregnation method. The method comprises the following steps: 1, preparing ReBaCo2O6-delta precursor sol; 2, preparing CGO hydrosol; 3, preparing RBCO-XCGO composite materials. The cathode materials and electrolyte materials are once compounded in situ in a liquid phase system, without the step of secondary impregnation to ensure the uniformity of the composite materials. CGO nanoparticles effectively prevent agglomeration of the cathode materials in the high-temperature sintering process, thereby being beneficial to improving electrode performances.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, in particular to a method for preparing a composite cathode material RBCO-xCGO of a solid oxide fuel cell by an in-situ colloid composite method. Background technique [0002] The commercialization of solid oxide fuel cells (SOFCs) requires lower operating temperatures to overcome many of the problems faced at high temperatures (eg, cell sealing, connector stability, material aging, etc.). To achieve this goal, improving the electrode performance of existing cathode materials is a key issue. Cobalt-based perovskite structure materials show excellent electrocatalytic activity as SOFC cathode materials, but the high thermal expansion coefficient of cobalt-based cathode materials leads to poor thermal matching with existing common electrolyte materials, which limits its large-scale application. The study found that the composite cathode made by compounding a certain proportion of the electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8652H01M4/88Y02E60/50
Inventor 孙丽萍赵辉衣凯华李强夏天
Owner HEILONGJIANG UNIV
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