Preparation method of solid oxide fuel cell gradient structure cathode film

A solid oxide and fuel cell technology, applied in solid electrolyte fuel cells, battery electrodes, structural parts, etc., can solve problems such as large polarization loss, achieve the effects of reducing interface impedance, simplifying sintering process, and reducing costs

Inactive Publication Date: 2015-04-29
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of large polarization loss of the solid oxide fuel cell cathode at medium and low temperatures, the present invention proposes a preparation method of a gradient porous cathode membrane, thereby significantly reducing the polarization loss of the cathode and improving the output efficiency of the battery

Method used

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  • Preparation method of solid oxide fuel cell gradient structure cathode film
  • Preparation method of solid oxide fuel cell gradient structure cathode film
  • Preparation method of solid oxide fuel cell gradient structure cathode film

Examples

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Embodiment 1

[0039] 1. Synthesis of LSCF powders with different particle sizes

[0040] Take La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Co(NO 3 ) 3 and Fe(NO 3 ) 3 9H 2 O as a raw material, La was synthesized by a sol-gel method 0.6 Sr 0.4 co 0.2 Fe0.8 o 3 (LSCF) powder, the particle size of the powder obtained after full ball milling and dispersion is 0.1-0.3 μm; 2 o 3 , SrCO 3 , CoCO 3 and Fe 2 o 3 As raw material, (LSCF) powder was synthesized by gel injection molding process, and the particle size of the synthesized powder was 0.6-1 μm; La 2 o 3 , SrCO 3 , CoCO 3 and Fe 2 o 3 As a raw material, the particle size of LSCF powder is synthesized by a solid-state method with a particle size of 1-2 μm.

[0041] 2. Slurry Preparation

[0042] (1) Use LSCF powder with a particle size of 0.1-0.3 μm to form a mixed powder with pore-forming agent graphite in a mass ratio of 1:0.1, add organic solvent ethanol and dispersant, ball mill for 20 hours, and then add plasticizer, After...

Embodiment 2

[0058] Embodiment 2: As described in Embodiment 1, the difference is that the gradient cathode material is strontium manganate lanthanum La x Sr 1-x MnO 3-δ (LSM), the sintering temperature is 1100°C, and it is kept for 2 hours and naturally cooled.

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Abstract

The invention discloses a preparation method of a solid oxide fuel cell gradient porous structure cathode film and belongs to the technical field of electrode design and preparation. A solid oxide fuel cell cathode is subjected to a gradient design and is divided into an inner layer, a middle layer and an outer layer; and the cathode film with the gradient-changeable grain diameter, gradient-changeable air pore size and gradient-changeable porosity is prepared by adopting a laminating tape casting process. The preparation method is simple and low in cost; and a prepared single cell has a good electrochemical performance and is expected to be applied and developed in commercialized production in middle-temperature and low-temperature flat plate type solid oxide fuel cells.

Description

technical field [0001] The invention relates to the preparation of a solid oxide fuel cell, in particular to a solid oxide fuel cell cathode membrane with a gradient porous structure and a preparation method thereof. Background technique [0002] Solid oxide fuel (SOFC) is a high-efficiency energy conversion device that uses dense oxide ceramics as the electrolyte membrane to directly convert the chemical energy of the fuel into electrical energy at high temperatures. Compared with other types of fuel cells (alkaline fuel cells, phosphoric acid fuel cells, proton membrane exchange fuel cells, direct methanol fuel cells, molten carbonate fuel cells), SOFC also has the following advantages: the fuel has wide adaptability and can be used directly Hydrocarbons are used as fuel; the use of an all-solid battery structure effectively solves the problems of corrosion of liquid electrolyte strips and loss of electrolyte; there is no need to use noble metal electrodes, which can great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCH01M4/861H01M4/88H01M8/10Y02E60/50
Inventor 聂丽芳刘泽刘明飞刘美林范伟建
Owner TIANJIN POLYTECHNIC UNIV
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