High performance electrode for medium-temperature solid oxide fuel cells -: Control of microstructure of La(Sr)CoO3 cathodes with highly dispersed Pt electrocatalysts

被引：57

作者：

Uchida, H ^{[1
]}

Arisaka, S ^{[1
]}

Watanabe, M ^{[1
]}

机构：

[1] Univ Yamanashi, Fac Engn, Lab Electrochem Energy Convers, Kofu, Yamanashi 4008511, Japan

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2002年 / 149卷 / 01期

关键词：

D O I：

10.1149/1.1423641

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In order to enhance gas diffusion rates in a porous La(Sr)CoO3 (LSC) cathode, additional mum-sized pores were introduced by sintering a LSC paste containing fine polymer beads (d = 1.2 mum), coated on yttria-stabilized zirconia (YSZ) electrolyte. A thin and dense samaria-doped ceria interlayer was used to avoid unfavorable solid-state reactions between LSC and YSZ. Control of the microstructure of LSC cathode appreciably lowered the IR-free overpotential without an increase of the ohmic resistance. The performance of the LSC cathode with optimized microstructure was enhanced further with highly dispersed Pt catalysts at 3 wt % loading, especially at low operating temperature. The current density on the Pt-LSC cathode at an overpotential of -50 mV was 1 A/cm(2) at 800 degreesC in air. (C) 2001 The Electrochemical Society.

引用

页码：A13 / A18

页数：6

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