Preparation method of solid oxide fuel cell cathode by utilizing electrical spinning method

Abstract

The invention relates to a preparation method of a solid oxide fuel cell cathode by utilizing an electrical spinning method, belonging to the technological field of function materials. The preparation method is characterized in that cathode material metal cations containing the stoichiometric ratio and the precursor solution or colloidal sol of the appropriate amount of polymerizer is subjected to electrical spinning on a substrate; then the spinning precursor sample is dried and sintered to prepare the solid oxide fuel cell cathode materials with a porous structure and controllable microstructure and thickness. The SOFC (Solid Oxide Fuel Cell) cathode prepared by utilizing the electrical spinning method has the advantages of large specific surface area, high porosity, adjustable aperture and good structure homogeneity; the oxygen transmission characteristic and the catalytic activity of the cathode can be enhanced; the polarization impedance is reduced; the performance in intermediate and low temperature solid oxide fuel cells is excellent; the simple, convenient and low-cost preparation of the solid oxide fuel cell cathode is realized by omitting a powder synthesis step and reducing a high-temperature sintering step; and the method comprises the preparation of perovskite structure oxide, class perovskite structure oxide and composite cathode materials.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a method for preparing a solid oxide fuel cell cathode, that is, an electrospinning preparation method. Background technique [0002] Solid oxide fuel cell (SOFC) is the third-generation fuel cell system with the highest energy conversion efficiency (50-70%), and is considered to be the green energy with the most development and application potential in the 21st century. Cathode is one of the key components of SOFC, which determines the performance and cost of SOFC. The SOFC cathode needs to have sufficient porosity and reasonable pore size distribution to increase the oxygen transport rate of the cathode, reduce the concentration polarization resistance, and improve the three-phase interface of the cathode reaction and the catalytic activity of oxygen reduction. [0003] The patent (CN101252190) applied by Shao Zongping of Nanjing University of Technology and his col...

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Problems solved by technology

[0005] The invention provides a preparation method of electrospinning for SOFC cathode. The prepared electrospinning solution or sol is electrospun on a substrate, and then sintered. By adjusting the parameters of the electrospinning process, porous materials with different thicknesses and microstructures are obtained. Structural cathode membrane; one of the purposes of the present invention is to simplify the cathode preparation process and reduce the preparation cost by omitting the powder synthesis step and reducing the high-temperature sintering step; another purpose is to prepare SOFC cathode with good performance can effectively control the microstructure of the cathode, and solve the problems of slow oxygen transport reaction, high polarization impedance and low catalytic activity caused by low cathode porosity and small three-phase interface