Oxygen exchange and diffusion in the near surface of pure and modified yttria-stabilised zirconia
Oxygen exchange and diffusion in the near surface of pure and modified yttria-stabilised zirconia
复制标题
DOI：
10.1016/s0167-2738(02)00759-2
复制
发表时间：
2003-02-01
影响因子：
3.2
通讯作者：
Kreissig, U
中科院分区：
文献类型：
--
作者：
de Ridder, M;van Welzenis, RG;Kreissig, U
通过研究通过氧化钇稳定的氧化锆（YSZ）的氧传输，可以提出一种策略，这将导致固体氧化物燃料电池（SOFC）的工作温度降低到中间温度范围，而不会损失性能。同位素交换深度剖析与低能离子散射（LEIS）和弹性反冲检测分析（ERDA）的组合显示了复杂的结构，影响表面氧交换反应和自扩散在10摩尔%的氧化钇掺杂的氧化锆。值得注意的是，在外表面存在一个薄（约6锰）层，显示出与单斜相的相似性。结果表明，一个显着的改善，在表面的氧交换相对于文献中报道的值时，杂质氧化物被阻止分离到外表面。大约850摄氏度的可能操作温度似乎是可行的。文献中报道的通过添加表面催化剂的表面氧交换的改善也归因于杂质的去除。通过去除本体中的杂质（这将导致晶界扩散的显著增加）和通过减小电解质厚度，可以进一步降低操作温度，降低到至少725 ℃。(C)2002 Elsevier Science B.V保留所有权利。
By studying the oxygen transport through yttria-stabilised zirconia (YSZ), a strategy could be proposed which should lead to a reduction in the operating temperature of the solid oxide fuel cell (SOFC) to the intermediate temperature range without loss in performance. The combination of isotopic exchange depth profiling with low energy ion scattering (LEIS) and elastic recoil detection analysis (ERDA) has shown a complex structure affecting the surface oxygen exchange reaction and self-diffusion in 10 mol% yttria-doped zirconia. Remarkable is the presence of a thin (about 6 mn) layer at the external surface showing resemblance with the monoclinic phase. The results suggest a significant improvement in the surface oxygen exchange with respect to the values reported in literature when impurity oxides are prevented from segregating to the external surface. A possible operating temperature of around 850 degreesC seems feasible. Improvements in the surface oxygen exchange by addition of a surface catalyst reported in literature are also attributed to the removal of impurities. Further decrease in operating temperature, down to at least 725 degreesC, should be possible by removing the impurities in the bulk, which should lead to a considerable increase in the grain boundary diffusion and by reduction of the electrolyte thickness. (C) 2002 Elsevier Science B.V All rights reserved.