稳定氧化锆固体电解质研究进展

Progress on stabilized zirconia as a solid-state electrolyte

稳定氧化锆作为固体氧化物燃料电池的电解质是最好的可用材料,介绍了这方面的研究进展,包括:纳米粉的制备,火花等离子体烧结法获得亚微米晶粒结构的高强度陶瓷,二次烧结前体清除法改善晶界的电导率和一个准三元系稳定的5% In2O3-8%Y2O3-ZrO2(式中均为摩尔百分数)。与准二元系稳定的8%Y2O3-ZrO2相比,该稳定氧化锆具有周期性晶格畸变大的各向异性和在实用温度范围不随老化松弛各向异性的特征,保证固体氧化物燃料电池工作时有稳定的和高的电效率。

Stabilized zirconia is the best material for electrolyte of solid oxide fuel cells (SOFC). Some of recent progress were summarized, including the preparation of nanosized powder, highly strengthened ceramic with submicrometer grain structure obtained via spark-plasma sintering method, improved conductivity of grain-boundary via precursor scavenging of two-stage sintering, and a pseudoternary stabilized 5%In2O3-8%Y2O3-ZrO2(all percentages in formula are mole percentage) system. Compared with pseudobinary stabilized 8%Y2O3-ZrO2 system, the system has bigger anisotropy of the periodic lattice distortion and no relaxation in the anisotropy with the aging within practical temperature ranges, ensuring to SOFC a high and stable electrical efficiency in the operation.