Proton ceramic membrane fuel cell of composite structure and preparation

Abstract

The invention relates to a proton ceramic membrane fuel cell of a composite structure. The fuel cell is composed of a cathode porous layer, an electrolyte porous layer, an anode porous layer, a cathode compact layer and an anode compact layer. The cathode porous layer and the anode porous layer play a role in gas transmission and surface catalysis; the cathode compact layer and the anode compact layer play a role in blocking gas and improving interface connection; and the electrolyte porous layer has the effects of conducting ions and blocking electrons. According to the proton ceramic membrane fuel cell with the composite structure, the preparation temperature can be reduced to 1,200-1,300 DEG C, and the problems that a traditional proton type electrolyte is difficult to sinter at high temperature, large in interface resistance and the like are solved, so the preparation cost is reduced, and the application range of the proton ceramic membrane fuel cell is expanded.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, in particular to a proton ceramic membrane fuel cell with a composite structure. Background technique [0002] Traditional solid oxide fuel cells use oxygen ions as carriers, and have problems such as difficult sealing, long start-up and stop times, and serious diffusion reactions of various components at high operating temperatures (800°C-1000°C). Solid oxide fuel cells use protons as carriers. The theoretical transport activation energy of protons is three orders of magnitude lower than that of oxygen ions, and the operating temperature can be reduced to between 350°C and 550°C. potential. At present, proton ceramic membrane fuel cells are mainly based on doped BaCeO 3 Base, BaZrO 3 The base is an electrolyte, which has high intrinsic proton conductivity, but poor sintering activity. For example, the sintering temperature of pure BZY is usually between 1700°C and 2200°C. Excessively hig...

AI Technical Summary

Problems solved by technology

At present, proton ceramic membrane fuel cells are mainly based on doped BaCeO 3 Base, BaZrO 3 The base is an electrolyte, which has high intrinsic proton conductivity, but poor sintering activity. For example, the sintering temperature of pure BZY is usually between 1700°C and 2200°C. Excessively high sintering temperature not only wastes energy, but also causes serious Ba volatilization, which affects the electrolyte. The actual ionic conductivity of

In addition, most of the proton ceramic membrane electrolytes are alkaline oxides, which have the problem of poor stability in acidic atmosphere.

Common methods for preparing proton ceramic membranes at low temperature: on the one hand, adding additives and using liquid phase sintering to promote electrolyte densification, but this method tends to leave impurity phases in the grain boundaries, which increases the grain boundary resistance and reduces battery performance; on the other hand, pulsed laser deposition , magnetron sputtering, chemical vapor deposition and other methods have been applied to prepare proton ceramic membranes, but the operation is complicated and the cost is high, which is not conducive to mass production