A kind of double-layer composite proton conductor material and its preparation method

Abstract

A double-layer composite proton conductor material and its preparation method, the material is a double-layer structure composed of a matrix part and a coating part, and the molecular formula of the matrix part is A 1‑y A' y B 1‑z B' z o 3‑α , the coating part formula A 3 (B' 1+x B″ 2‑x )O 9‑γ The preparation method is as follows: (1) prepare the first A raw material, the first B' raw material and the B" raw material, mix and ball mill to obtain the mixed powder I; (2) press the mixed powder I into a block, and calcined to obtain the calcined material I; (3) preparing the second A raw material, B raw material, A' raw material and the second B' raw material, mixing and ball milling to obtain mixed powder II; (4) pressing the mixed powder II into a block, and calcining to obtain calcined material II; ( 5) Press the calcined material II to form a base blank; use co-pressing, casting, spin coating, magnetron sputtering or laser deposition methods to cover the calcined material I on the base blank to form a coating; (6) double-layer blank Sintering. The product of the present invention ensures that the material has high proton conductivity, and greatly limits the electron conduction in the material.

Description

technical field [0001] The invention relates to the technical field of solid electrolyte proton conductors, in particular to a double-layer composite proton conductor material and a preparation method thereof. Background technique [0002] High-temperature oxide proton conductors are solid electrolyte materials that can transmit protons at high temperatures. Proton conductors have good application prospects in the fields of hydrogen sensors, fuel cells, ammonia synthesis at atmospheric pressure, and electrochemical hydrogenation and dehydrogenation; Simple perovskite ABO doped in conductors 3 type materials and double perovskite A 3 (B' 1+x B″ 2-x )O 9 The material has good proton conductivity. [0003] Simple perovskite structure ABO 3 It is a cubic, tetragonal or orthorhombic crystal system, where the A position is usually +2 valent cations (such as Ba, Ca, Sr, etc.), and the B position is +4 valent cations (such as Zr, Ce, etc.), usually trivalent rare earth element...

AI Technical Summary

Problems solved by technology

By adjusting the ratio of B' and B" ions, oxygen vacancies are generated, protons are introduced, and proton conduction occurs; different from ABO 3 Simple Perovskite Material, Double Perovskite A 3 (B' 1+x B″ 2-x )O 9 The material can hinder electron and electron-hole conduction; however, double perovskite A 3 (B' 1+x B″ 2-x )O 9 The concentration of protons in the material decreases dramatically, resulting in a material with low proton conductivity at high temperature

[0005] From the above, it can be seen that the current simple perovskite structure ABO 3 The material is easy to generate electrons and electron-hole conduction, and the double perovskite A 3 (B' 1+x B″2 -x )O 9 The material has low proton conductivity at high temperature, which limits the application of the material

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