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.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
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)
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
samarium
strontium
cobalt
carbon dioxide
polarization resistance
cathode electrocatalyst
solid oxide fuel cell
