Method for preparing bismuth oxide-lanthanum molybdate composite electrolyte by sol-gel self-combustion method

Abstract

The invention relates to the technical field of solid electrolyte material preparation, in particular to a method for preparing bismuth oxide-lanthanum molybdate composite electrolyte by a sol-gel self-combustion method. The method comprises the following steps that acidifying is carried out on a mixed solution of lanthanum nitrate and ammonium molybdate by using ethylene glycol, and then stirringand heating are performed to carry out sol-gel reaction to prepare lanthanum molybdate coarse powder; the lanthanum molybdate powder is purified by a self-combustion method, the lanthanum molybdate coarse powder is placed in a crucible to be placed into a muffle furnace for sintering; and solid-phase compounding is carried out on lanthanum molybdate and bismuth oxide, and steps of grinding, tabletting, and finally sintering are carried out to prepare the bismuth oxide-lanthanum molybdate composite electrolyte. When the bismuth oxide and lanthanum molybdate composite electrolyte with the doping ratio of 20% is sintered to 800 DEG C, the absorption peak of the bismuth oxide completely covers the absorption peaks of the lanthanum molybdate, and the composite degree is very high. The researchalso provides important experimental data for research and practical application of bismuth oxide.

Description

technical field [0001] The invention relates to the technical field of preparation of solid electrolyte materials, in particular to a method for preparing a bismuth oxide-lanthanum molybdate composite electrolyte by a sol-gel self-combustion method. Background technique [0002] A solid oxide fuel cell (SOFC) is a conversion device that directly converts the activation energy of a material into electrical energy. It has attracted widespread attention because of its high efficiency and is considered to be one of the most promising clean energy sources in the 21st century. [0003] In solid electrolyte fuel cells, if the crystal box of the electrolyte is accompanied by a large volume change, it will have a very large impact on the performance of the electrolyte, so the stability of the electrolyte is very important, and in the manufacturing and operating environment. Keep the chemical composition, tissue structure, shape and size stable. δ-Bi 2 O 3 Its conductivity is the ...

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Problems solved by technology

δ-Bi 2 o 3 The electrical conductivity is the phase with the highest conductivity among its various phases, but it has a very obvious disadvantage, that is, the temperature range is very small (730-825 ° C), so in order to get a wide range of practical applications, it must be To overcome this problem, the δ phase has better stability in a wide temperature range

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