Sc2O3-stabilized ZrO2-based electrolyte powder and preparation method thereof, and Sc2O3-stabilized ZrO2 electrolyte ceramic wafer prepared from powder

Abstract

The invention discloses Sc2O3-stabilized ZrO2-based electrolyte powder and a preparation method thereof, and a Sc2O3-stabilized ZrO2 electrolyte ceramic wafer prepared from the powder. The Sc2O3-stabilized ZrO2-based electrolyte powder is characterized in that zirconyl nitrate, Sc2O3, optional CeO2, nitric acid, and optional auxiliary materials are used as the raw materials, an ammonium bicarbonate-ammonia buffer system is used as a precipitant, and the coprecipitation, mist spray and heat treating method is carried out to prepare the powder of which a bulk phase is a cubic phase. Such Sc2O3-stabilized ZrO2-based electrolyte powder has the advantage that the raw materials are low in price and nontoxic; the Sc2O3-stabilized ZrO2-based electrolyte powder can be prepared into a high-strength dense electrolyte ceramic wafer which has relatively high ionic conductivity stability and the like. Simultaneously, according to the preparation method of the Sc2O3-stabilized ZrO2-based electrolyte powder, follow-up complex processes such as filtering, washing and drying in the coprecipitation method are avoided, the agglomeration is reduced, the product purity is ensured, the process is simple, the process is continuous and efficient in process, and large industrial production is facilitated.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cell electrolyte preparation and relates to a Sc 2 o 3 Stabilized ZrO 2 Base electrolyte powder, its preparation method and Sc 2 o 3 Stabilized ZrO 2 Electrolyte ceramic sheet. Background technique [0002] As an efficient and clean new energy source, solid oxide fuel cell (SOFC for short) has broad application prospects. Foreign countries such as the American venture company Bloom Energy have disclosed their SOFC products in 2010, while in China, due to the late start and foreign technology blockade, SOFC research is still in the development stage. SOFC includes electrolyte, anode, cathode, connector material and sealing material, among which the electrolyte material is the core component, and its performance (conductivity, stability, thermal expansion, densification temperature, etc.) directly affects the operating temperature and power conversion efficiency of SOFC , so the following cond...

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Problems solved by technology

[0004] (1) An Shengli and others used zirconium n-propoxide (C 12 h 28 o 4 Zr) and Sc 2 o 3 As a raw material, scandium oxide stabilized zirconia (9mol%Sc 2 o 3 ; ScSZ) powder, but the zirconium raw material it uses is expensive, not suitable for industrialized production

[0005] (2) The patent CN201010151728.6 of Jiangxi Fanmeiya Material Co., Ltd. introduces the preparation of scandia-stabilized zirconia powder by atmospheric pressure hydrolysis reaction and low-pressure hydrothermal reaction, but the process is relatively complicated, and the process requires high equipment and is difficult. Realize industrial production

[0006] Although many improved methods for yttria-stabilized zirconia materials (YSZ) have been proposed in the prior art, the existing ScSZ powder preparation methods, such as the sol-gel method, require expensive raw materials, hydrolysis-hydrothermal The method has relatively high requirements on equipment, and the co-precipitation method is prone to hard agglomeration, etc., and it is difficult to realize industrialized large-scale production, which seriously hinders the development of the SOFC industry.

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