Atomic Layer Deposition Functionalized Composite SOFC Cathode La0.6Sr0.4Fe0.8Co0.2O3-δ -Gd0.2Ce0.8O1.9: Enhanced Long-Term Stability

被引：83

作者：

Gong, Yunhui ^{[1
]}

Patel, Rajankumar L. ^{[2
]}

Liang, Xinhua ^{[2
]}

Palacio, Diego ^{[3
]}

Song, Xueyan ^{[3
]}

Goodenough, John B. ^{[4
]}

Huang, Kevin ^{[1
]}

机构：

[1] Univ S Carolina, Dept Mech Engn, Columbia, SC 29201 USA

[2] Missouri Univ Sci & Technol, Dept Chem & Biochem Engn, Rolla, MO 65409 USA

[3] W Virginia Univ, Dept Mech & Aerosp Engn, Morgantown, WV 26506 USA

[4] Univ Texas Austin, Texas Mat Inst, Austin, TX 78713 USA

来源：

CHEMISTRY OF MATERIALS | 2013年 / 25卷 / 21期

基金：

美国国家科学基金会;

关键词：

atomic layer deposition; solid oxide fuel cell; cathode; stability; OXYGEN-REDUCTION ACTIVITY; FUEL-CELL CATHODE; THIN-FILMS; SURFACE; PERFORMANCE; DEGRADATION; ALD; INTERCONNECT; STRONTIUM; CATALYSTS;

D O I：

10.1021/cm402879r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report that the long-term stability of a conventional mixed oxide-ion and electron conducting solid oxide fuel cell cathode, La0.6Sr0.4Fe0.8Co0.2O3-delta-Gd0.2Ce0.8O1.9 (LSCF-GDC) composite, can be markedly improved by functionalizing its surfaces with a conformal layer of nanoscale ZrO2 films through atomic layer deposition (ALD). Over a >1100 h testing at 800 degrees C, the overcoated LSCF-GDC cathode exhibited respective polarization and ohmic area-specific-resistances 3 and 1.5 times lower than the pristine sample, whereas the pristine LSCF-GDC cathode degraded at a rate 4 times faster than the overcoated one. The multifunctionality of porosity, mixed conductivity, and suppressed Sr-enrichment enabled by the nanoscaled ALD-ZrO2 overcoats are attributed to the performance retention observed for the overcoated cathode.

引用

页码：4224 / 4231

页数：8

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