Process for producing medium-temperature solid-oxide fuel battery electrolyte material lanthanum silicate powder

Abstract

The invention relates to a method for preparing lanthanum silicate powder-an electrolyte material for a mesothermal solid oxide fuel cell, and belongs to the field of preparation of inorganic materials. The method comprises the following steps: firstly, preparing a nitrate raw material into a saturated solution and nano silicon dioxide into uniform suspension according to the stoichiometric ratio of the target lanthanum silicate powder, and uniformly mixing and stirring the saturated solution and the suspension; secondly, adding an organic monomer-acrylamide and a crosslinking agent-N,N'-methylene-bisacrylamide into the mixture for uniformly stirring; thirdly, adding an initiator-a ammonium persulfate aqueous solution into the mixture, keeping the mixture stand at the temperature of between 60 and 80 DEG C for 30 to 80 minutes after uniformly stirring the mixture, curing slurry into gel, and performing dehydration or thermal treatment on the gel to obtain a plastery precursor; and fourthly, calcining the precursor at high temperature, and obtaining the electrolyte material-the lanthanum silicate powder with high purity and an apatite structure.

Description

technical field [0001] The invention relates to a preparation method of apatite-structured lanthanum silicate powder used as an electrolyte material for intermediate temperature solid oxide fuel cells (IT-SOFCs), and belongs to the field of ceramic powder synthesis. technical background [0002] At present, the primary energy consumption structure in the world is still dominated by fossil energy consumption. However, fossil energy is an unclean energy. While meeting most of the energy needs of people, it also discharges a large amount of waste water and waste gas into nature. , waste residues, causing global environmental problems such as acid rain hazards, greenhouse effect, ozone layer destruction, potential feminization hazards, and the threat of chemical time bombs. A fuel cell is a high-efficiency energy conversion device that directly converts the chemical energy of fuel into electrical energy through electrochemical reactions, which greatly reduces environmental pollu...

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Problems solved by technology

Synthesis of Lanthanum Silicate La by Solid State Reaction 10 Si 6 o 27 When it is difficult to mix the oxide raw materials evenly, it is easy to produce impurity phase La 2 SiO 5 or La 2 Si 2 o 7 , the apatite structure La with high purity and uniform particle size can be prepared by sol-gel (sol-gel) method 10 Si 6 o 27 [See: Shanwen Tao, John T.S. Irvine, Preparation and characterization of apatite-typelanthanum silicates by a sol-gel process, Materials Research Bulletin, 36(2001) 1245-1258; Stéphane Celerier, C.Laberty-Robert, F.Ansart , C.Calmet, P.Stevens, Synthesis by sol-gel routeoxyapatite powders for dense ceramics: Applications as electrolytes for solid oxide fuel cells, Journal of the European Ceramic Society.25(2005)2665-2668], however, using sol- The gel process needs to use expensive metal alkoxides as raw materials, which is not conducive to reducing the preparation cost of IT-SOFCs

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