Metal-supported solid oxide electrolytic cell adopting GDC electrolyte

Abstract

The invention provides a metal-supported solid oxide electrolytic cell adopting a GDC electrolyte. The metal-supported solid oxide electrolytic cell comprises a metal support body, a cathode layer, an anode layer and a GDC electrolyte layer, an electron barrier layer is arranged between the GDC electrolyte layer and the cathode layer and between the GDC electrolyte layer and the anode layer; the electron barrier layer comprises a zirconia material which is compounded and stabilized by scandium oxide and cerium oxide; the cathode layer is deposited on the metal support. According to the present invention, the scandium oxide and cerium oxide composite stable zirconium oxide is adopted as the electron blocking layer material, such that the electron conductivity of the GDC is effectively blocked, the oxygen partial pressure in the GDC main electrolyte is controlled, the decomposition or interface layering problem is avoided, and the working temperature and the input voltage of the electrolytic tank are significantly reduced without increasing the impedance of the electrolytic tank. Meanwhile, metal sealing can be allowed to be adopted at the low operation temperature, the operation cost can be reduced, and the reliability and durability of the system can be improved.

Description

technical field [0001] The invention belongs to the field of hydrogen production devices, and in particular relates to a metal-supported solid oxide electrolytic cell using GDC electrolyte. Background technique [0002] Solid Oxide Electrolysis Cell (SOEC for short) is a completely solid-state water electrolysis hydrogen production device operating in a high temperature environment. It is a very promising technology. It has high energy conversion efficiency and environmental protection. Friendly and both electrolytic CO 2 Etc. The key to realizing the industrial application of SOEC is to reduce the cost of the electrolytic cell, and the effective way to reduce the cost is to reduce the working temperature of the electrolytic cell. [0003] GDC electrolytes have high ionic conductivity and can operate at lower temperatures, but they are not chemically stable and can be reduced when exposed to reducing atmospheres at high temperatures, where Ce 4+ Partial reduction to Ce 3...

AI Technical Summary

Problems solved by technology

However, the YSZ electrolyte material has better chemical stability, but its ionic conductivity is low under low temperature conditions below 650 °C, which greatly increases the ohmic polarization, and is actually not suitable for mass production of SOEC, and, GDC The electrolyte on the side close to the fuel electrode is prone to GDC decomposition due to the low internal oxygen partial pressure, which also limits the application of GDC electrolytes

The technical problems of GDC electrolyte-based SOEC have not been effectively resolved

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