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利用浸渍法制备了以La0.6Sr0.4Co0.2Fe0.8O3–δ(LSCF)为催化相、Ce0.8Sm0.2O1.9(SDC)为骨架的纳米结构复合阴极,并将LSCF–SDC复合阴极在600℃保温500 h,随后再用HCl腐蚀,研究了LSCF–SDC纳米结构复合阴极性能衰减的机理。结果表明:LSCF–SDC纳米结构复合阴极在600℃保温处理500 h后,阴极的极化电阻从0.21Ω·cm–2增加到0.25Ω·cm–2,增加了19%,对其腐蚀处理后阴极极化电阻降为0.15Ω·cm–2,阴极催化活性的降低主要与氧在阴极表面的吸附与解离过程有关;阴极相组成和表观形貌没有明显的变化;保温处理后Sr2+在阴极表面以SrO的形式富集。
Abstract：The La0.6Sr0.4Co0.2Fe0.8O3–δ(LSCF)–Ce0.8Sm0.2O1.9(SDC)composite cathodes were fabricated by infiltrating nano-sized LSCF coatings into the porous SDC backbones.The microstructure and electrochemical properties evolution of the composite cathode with time was investigated through the aging treatment at 600℃for 500 h and the etching treatment.The polar resistance(Rp)of the cathodes measured at 600℃is 0.21,0.25 and 0.15Ω·cm–2 for the as-prepared,the aged and the etched cathodes,respectively.The impedance spectra plots show that the evolution of Rp is mainly related to the oxygen absorption and dissociation on the cathode surface.The XRD and SEM results show that no appreciable changes about the phase composition and the apparent morphology are observed.The XPS results showed the nano-sized LSCF–SDC cathode deactivation at 600℃was mainly attributed to the Sr segregation to the surface of the LSCF and the formation of SrO.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2019.06.06
中图分类号:TM911.4
引用信息:
[1]徐红梅,孙凯利,万峰,等.固体氧化物燃料电池La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3–δ)–Ce_(0.8)Sm_(0.2)O_(1.9)纳米结构复合阴极的性能衰减行为[J].硅酸盐学报,2019,47(06):752-757.DOI:10.14062/j.issn.0454-5648.2019.06.06.
基金信息:
国家自然科学基金(51402104)
2019-03-26
2019-03-26
2019-03-26