Synthesis and characterization of Nd0.6Sr0.4Co1-yMnyO3-δ (0≤y≤1.0) cathodes for intermediate temperature solid oxide fuel cells

被引：32

作者：

Lee, K. T. ^{[1
]}

Manthiram, A. ^{[1
]}

机构：

[1] Univ Texas, Mat Sci & Engn Program, Austin, TX 78712 USA

来源：

JOURNAL OF POWER SOURCES | 2006年 / 158卷 / 02期

关键词：

solid oxide fuel cells; cathode materials; electrical conductivity; thermal expansion; electrochemical performance; ELECTRICAL-PROPERTIES; THERMAL-EXPANSION; CRYSTAL-STRUCTURE; PEROVSKITE; SR; NONSTOICHIOMETRY; MECHANISM; ELECTRODE; SYSTEM; SOFC;

D O I：

10.1016/j.jpowsour.2005.10.021

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

Nd0.6Sr0.4Co1-yMnyO3-delta (0 <= y <= 1.0) oxides have been investigated as cathode materials for intermediate temperature solid oxide fuel cells (SOFC). The samples form a single-phase solid solution with an orthorhombic perovskite structure and the lattice parameters and volume increase with increasing Mn content y. The degree of oxygen loss at high temperatures and the thermal expansion coefficient (TEC) decrease with increasing y due to a stronger Mn-O bond. The electrical conductivity decreases with y and the system exhibits a metal to semiconductor transition at around y = 0.2. The electrocatalytic activity and power density measured with single cell SOFC decrease with increasing y due to a decrease in oxygen exchange and mobility as well as charge transfer kinetics, arising from a decrease in the oxide ion vacancy concentration and electrical conductivity. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：1202 / 1208

页数：7

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