A proton ceramic membrane fuel cell with composite structure and its preparation

Abstract

The invention relates to a proton ceramic membrane fuel cell with composite structure. The fuel cell is composed of five parts: a cathode porous layer, an electrolyte porous layer, an anode porous layer, a cathode dense layer and an anode dense layer. Among them, the cathode porous layer and the anode porous layer play the role of gas transport and surface catalysis; the cathode dense layer and the anode dense layer play the role of blocking gas and improving interface connection; the electrolyte porous layer plays the role of conducting ions and blocking electrons. The proton ceramic membrane fuel cell with composite structure can reduce the preparation temperature to 1200°C-1300°C, breaking through the problems of traditional proton-type electrolytes such as high-temperature difficulty in sintering and high interface resistance, thereby reducing the preparation cost and expanding its application range.

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