Compound solid oxide fuel cell and preparation method thereof

Abstract

The invention relates to a compound solid oxide fuel cell, which consists of a compound positive electrode layer, an oxygen ion-proton double-conductor compound electrolyte layer, a compound porous electrolyte interlayer and a double-negative-electrode layer, wherein the compound electrolyte layer can simultaneously carry out proton electrical conduction and oxygen ion electrical conduction, and electrolyte ion electrical conduction can achieve performance requirements at intermediate, low and high temperatures; the compound porous electrolyte interlayer can effectively obstruct reaction between the negative electrode and the electrolyte so as to lower interfere resistance; and the double-negative-electrode layer consists of an electron electrical conduction enhancement layer and an ion electrical conduction enhancement layer, and polarization resistance is greatly lowered. Therefore, the compound solid oxide fuel can meet performance requirements at any SOFC (Solid Oxide Fuel Cell) operation temperature (350-800DEG C), and has a wide application value.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, in particular to a composite solid oxide fuel cell. Background technique [0002] Traditional solid oxide fuel cells mostly use oxygen ions as carriers. This type of battery was discovered earlier, and the current research is relatively mature, and some of them have been commercialized. However, too high operating temperature (800°C-1000°C) brings problems to battery cost and long-term stability. However, the currently researched hot proton fuel cells use hydrogen ions as carriers, theoretically the transmission activation energy is three orders of magnitude lower than that of oxygen ions, and the operating temperature is between 350°C and 550°C, but the research is not yet mature, and there are still Sinterability and stability in acidic atmosphere and other issues. Therefore, the development of a solid oxide fuel cell suitable for use in various temperature ranges, especially at low temp...

AI Technical Summary

Problems solved by technology

But on the one hand, the increase of ohmic resistance at low temperature, especially for oxygen-ion-type electrolytes, will lead to a sharp decline in performance; The application of biofuel cells under medium and low temperature conditions, such as the thermal matching between the commonly used oxygen ion-conducting oxide membrane material YSZ and the commonly used LSCF, BSCF and other barium- and strontium-containing cathodes and the high-temperature reaction to form a non-conductive layer

Studies have shown that adding a dense interlayer between the electrolyte and the cathode, such as sputtering or chemical vapor deposition of a GDC dense interlayer on the surface of YSZ, can improve the overall battery performance, but the preparation process is more complicated and the cost is higher (Solid State Ionics, 2016, 295 :25-31.)

In addition, new cathode materials such as BCFZY have high ion conductivity, but poor electronic conductivity, only 1.3S / cm at 700°C (Science, 2015, 349:6254.), and the performance can be improved by coating Au collector layer double, but the above method has the disadvantages of high cost and unfavorable industrialized production