Electrochemical characterization of Pr2CuO4-Ce0.9Gd0.1O1.95 composite cathodes for solid oxide fuel cells

被引：22

作者：

Kolchina, L. M. ^{[1
]}

Lyskov, N. V. ^{[2
]}

Petukhov, D. I. ^{[1
]}

Mazo, G. N. ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119992, Russia

[2] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 605卷

基金：

俄罗斯基础研究基金会;

关键词：

Pr2CuO4; Composite cathode; Electrode/electrolyte interface; Impedance spectroscopy; IT-SOFCs; IMPEDANCE SPECTROSCOPY; STABILIZED ZIRCONIA; THERMAL-EXPANSION; AIR CATHODES; PERFORMANCE; ELECTROLYTE; SOFC; POLARIZATION;

D O I：

10.1016/j.jallcom.2014.03.179

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：

Pr2CuO4-Ce0.9Gd0.1O1.95 (PCO-GDC) composites screen printed on Ce0.9Gd0.1O1.95 (GDC) electrolyte were considered as a cathode material for intermediate temperature solid oxide fuel cells (IT-SOFCs). Phase composition, microstructure and electrochemical properties were investigated by X-ray powder diffraction (XRD), scanning electron microscopy and AC impedance spectroscopy, respectively. The oxygen reduction on porous PCO-GDC electrode applied on CGO electrolyte was studied in a symmetrical cell configuration by AC impedance spectroscopy at OCV conditions at 670-730 degrees C and p(O2) = 10(-2) - 0.21 atm. The charge transfer process and the dissociation of adsorbed molecular oxygen were found to be rate-determining steps of the oxygen reduction reaction. Results reveal that both GDC addition and electrode morphology have strong influence on area specific resistance (ASR) of the electrode/electrolyte interface. The lowest ASR value of 0.41 Omega cm(2) was achieved for the composition containing 33 wt.% GDC at 700 degrees C in air. The data obtained allow to consider the PCO-GDC33 composite as a promising cathode material for IT-SOFCs. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：89 / 95

页数：7