CO_2原位处理对Sm_(0.5)Sr_(0.5)CoO_(3-δ)电催化剂性能的影响  

Effect of CO_2 Treatment on the Performance of Sm_(0.5)Sr_(0.5)CoO_(3-δ) Cathode Electrocatalyst

作　　者：张海洲[1] 丛铀[1] 杨维慎[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2008年第1期7-9,共3页

基　　金：国家杰出青年科学基金(20725313);国家重点基础研究发展计划(973计划;2005CB221404)

摘　　要：采用阴极轻度过烧工艺制备了Sm_(0.5)Sr_(0.5)CoO_(3-δ)(SSC)阴极,并在单电池运行条件下利用25%CO2(体积比)对电池阴极进行了原位处理.XRD及TG分析表明,在600℃下,CO2的原位处理导致SSC阴极表面有少量SrCO3和Co3O4生成.空气吹扫下,SrCoO3-δ和Co3O4的存在都有效地改变了阴极材料的表面物理化学性质.阴极电催化剂上氧还原速率的加快显著地降低了阴极的极化电阻,从而导致电池的功率密度提高了约20%.The Sm0.5Sr0.5CoO3-δ （SSC） cathode was fabricated under slightly overtired condition and was in situ treated with 25 % CO2 （V/V） under single cell operating circumstance. XRD and TG analysis demonstrated that some SrCO3 and Co3O4 appeared on the SSC surface after CO2 treatment at 600 ℃. The existence of SrCoO3-δ and Co3O4 under air sweep condition resulted in the changes of physicochemical properties of cathode surface to some extent. The acceleration of oxygen reduction rate of the cathode electrocatalyst evidently decreased the polarization resistance and consequently yielded about 20 % higher cell performance than the untreated one.

关 键 词：钐 锶 钴 二氧化碳 极化电阻 阴极电催化剂 固体氧化物燃料电池 

分 类 号：TM911.4[电气工程—电力电子与电力传动]