Microscopic and Nanoscopic Three-Phase-Boundaries of Platinum Thin-Film Electrodes on YSZ Electrolyte

被引：92

作者：

Ryll, Thomas ^{[1
]}

Galinski, Henning ^{[1
]}

Schlagenhauf, Lukas ^{[1
]}

Elser, Pierre ^{[1
]}

Rupp, Jennifer L. M. ^{[1
]}

Bieberle-Hutter, Anja ^{[1
]}

Gauckler, Ludwig J. ^{[1
]}

机构：

[1] ETH, Dept Mat, CH-8093 Zurich, Switzerland

来源：

ADVANCED FUNCTIONAL MATERIALS | 2011年 / 21卷 / 03期

关键词：

O-2(G)VERTICAL-BAR-YTTRIA-STABILIZED ZIRCONIA SYSTEM; YTTRIA-STABILIZED ZIRCONIA; OXIDE FUEL-CELLS; REACTION-MECHANISM; CEO2; ELECTROLYTES; SUBSTITUTED ZRO2; OXYGEN-TRANSFER; POLARIZATION; IDENTIFICATION; AGGLOMERATION;

D O I：

10.1002/adfm.201001729

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Agglomerated Pt thin films have been proposed as electrodes for electrochemical devices like micro-solid oxide fuel cells (mu-SOFCs) operating at low temperatures. However, comprehensive studies elucidating the interplay between agglomeration state and electrochemical properties are lacking. In this contribution the electrochemical performance of agglomerated and "dense" Pt thin film electrodes on yttria-stabilized-zirconia (YSZ) is correlated with their microstructural characteristics. Besides the microscopically measurable triple-phase-boundary (tpb) where Pt, YSZ and air are in contact, a considerable contribution of "nanoscopic" tpbs to the electrode conductivity resulting from oxygen permeable grain boundaries is identified. It is demonstrated that "dense" Pt thin films are excellent electrodes provided their grain size and thickness are in the nanometer range. The results disprove the prevailing idea that the performance of Pt thin film electrodes results from microscopic and geometrically measurable tpbs only.

引用

页码：565 / 572

页数：8

共 28 条

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