A位缺陷对铁酸盐基阴极材料硫中毒特性影响

Effect of A⁃Site Defect on Sulfur Poisoning Behaivor of Ferrite⁃Based Cathode Materials

杨权森 王芳芳

Quansen Yang Fangfang Wang

南京理工大学 能源与动力工程学院, 江苏 南京 210094

School of Energy and Power Engineering，Nanjing University of Science and Technology，Nanjing Jiangsu 210094，China

空气中微量SO2 (10-9)引起阴极材料硫中毒是导致固体氧化物燃料电池（SOFC）性能衰减的关键因素之一。将(La0.6Sr0.4) (Co0.2Fe0.8)O3（LSCF）和A位缺陷型(La0.6 Sr0.4)0.85(Co0.2Fe0.8)O3（LSCF85）样品放置在含有30 μg/g SO2的干空气气氛中，800 ℃条件下热处理50 h后，对反应的生成物进行XRD、SEM、EDX表征，评价A位缺陷的存在对钙钛矿结构铁酸盐基固体氧化物燃料电池阴极材料硫中毒行为的影响。结果发现，对于钙钛矿结构LSCF阴极材料，A位缺陷的引入可以有效地抑制该材料与SO2发生化学反应生成SrSO4，提高材料在含SO2气氛中的化学稳定性。其原因可能是由于A位缺陷的引入，降低了LSCF中Sr元素的活性，从而抑制了Sr元素与SO2之间化学反应的发生。

Ppb amount of SO2 in air will react with cathode material of solid oxide fuel cell, inducing decrease of the cell/stack performance as one of the most effective factors.The sulfur poisoning behavior of (La0.6Sr0.4) (Co0.2Fe0.8)O3(LSCF) and A?site deficient (La0.6Sr0.4)0.85(Co0.2Fe0.8)O3(LSCF85) was investigated after exposure to 30 μg/g SO2 at 800 ℃ for 50 h.The products of the reaction were characterized by XRD,SEM and EDX to evaluate the effect of A?site defects on the sulfur poisoning behavior of perovskite ferrite based solid oxide fuel cell cathode materials. It was found that A?site defect in LSCF85 can suppress the chemical reaction between LSCF based cathode and SO2. It was ascribed to the low Sr reaction activity with SO2 caused by the existence of A?site defect.

国家自然科学基金资助项目(51802158)

10.3969/j.issn.1006-396X.2021.06.001