A ceria-based electrolyte separator for solid oxide fuel cells and its preparation

Abstract

The invention discloses a solid oxide fuel cell cerium-oxide-based electrolyte barrier layer comprising a compact layer and a loose layer. The compact layer can effectively inhibit harmful chemical reactions and element diffusion between cobalt cathode and a zirconia-based electrolyte. The loose layer can improve the contact performance of a cathode / electrolyte interface. The barrier layer is prepared with a radio frequency magnetron reactive sputtering method under a lower temperature, such that the production of cerium-zirconium oxide solid solution produced through the reaction with the zirconia-based electrolyte is avoided. With the barrier layer, cell performance is effectively improved, and long-time stability and reliability of the solid oxide fuel cell are improved.

Description

technical field [0001] The invention relates to the field of solid oxide fuel cells, in particular to a ceria-based electrolyte interlayer between a cobalt-containing cathode and a zirconia-based electrolyte and a preparation method thereof. Background technique [0002] Solid oxide fuel cell is an energy conversion device that can efficiently convert the chemical energy in fuel gas (such as hydrogen, natural gas, coal gas, etc.) Low noise, it is an ideal distributed power station and centralized power station technology, and can also be applied to vehicle auxiliary power supply, portable power supply, etc. [0003] In order to reduce manufacturing costs, improve long-term battery stability and reliability, and shorten start-up time, medium and low temperature solid oxide fuel cells with an operating temperature of 500-700 °C have become the focus of research and development at home and abroad. However, currently used medium and low temperature high-performance cobalt-conta...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of poor chemical and thermal compatibility between cobalt-containing highly active cathodes and zirconia-based electrolytes in solid oxide fuel cells, and poor contact performance between cathodes and electrolytes, the object of the present invention is to provide a A dense cerium oxide-based electrolyte interlayer that can effectively prevent the reaction between the cobalt-containing cathode and the zirconia-based electrolyte is prepared, and a loose ceria-based electrolyte interlayer is prepared on this basis, which can effectively improve the contact performance between the cathode and the electrolyte and reduce the contact between the cathode and the electrolyte. Electrolyte interface contact resistance, thereby effectively increasing the battery output power and improving the long-term stability and reliability of the battery