TY - JOUR

T1 - Electrochemical characterization of infiltrated Bi2V0.9Cu0.1O5.35 cathodes for use in low temperature solid oxide fuel cells

A1 - Samson,Alfred Junio

A1 - Søgaard,Martin

A1 - Bonanos,Nikolaos

AU - Samson,Alfred Junio

AU - Søgaard,Martin

AU - Bonanos,Nikolaos

PB - Elsevier BV North-Holland

PY - 2012

Y1 - 2012

N2 - The electrochemical performance of porous Bi2V0.9Cu0.1O5.35 (BICUVOX) and BICUVOX-Ce0.9Gd0.1O1.95 (CGO) composite backbones infiltrated with La0.6Sr0.4Co1.05O3-δ (LSC) has been evaluated. LSC was introduced into the screen printed and sintered porous backbones by multiple infiltrations of aqueous nitrate solutions followed by firing. The polarization resistance at 500 °C in air, measured using electrochemical impedance spectroscopy on symmetrical cells of BICUVOX backbones infiltrated with LSC, was approximately 100 times higher than the one obtained for a CGO backbone subjected to the same LSC infiltrations even though the conductivity of BICUVOX at 500 °C was significantly higher than that of CGO at this temperature. The poor performance of the infiltrated BICUVOX backbones is attributed to their coarse microstructure, brought about by the high temperature sintering of the BICUVOX backbone onto the dense CGO electrolyte and a possible reaction layer between the LSC infiltrate material and the BICUVOX backbone. The poor chemical compatibility of BICUVOX with LSC even by using a low temperature processing for the LSC using the infiltration method greatly undermines the motivation to continue the exploration of the combination of these materials for use in solid oxide fuel cells. © 2012 Elsevier B.V. All rights reserved

AB - The electrochemical performance of porous Bi2V0.9Cu0.1O5.35 (BICUVOX) and BICUVOX-Ce0.9Gd0.1O1.95 (CGO) composite backbones infiltrated with La0.6Sr0.4Co1.05O3-δ (LSC) has been evaluated. LSC was introduced into the screen printed and sintered porous backbones by multiple infiltrations of aqueous nitrate solutions followed by firing. The polarization resistance at 500 °C in air, measured using electrochemical impedance spectroscopy on symmetrical cells of BICUVOX backbones infiltrated with LSC, was approximately 100 times higher than the one obtained for a CGO backbone subjected to the same LSC infiltrations even though the conductivity of BICUVOX at 500 °C was significantly higher than that of CGO at this temperature. The poor performance of the infiltrated BICUVOX backbones is attributed to their coarse microstructure, brought about by the high temperature sintering of the BICUVOX backbone onto the dense CGO electrolyte and a possible reaction layer between the LSC infiltrate material and the BICUVOX backbone. The poor chemical compatibility of BICUVOX with LSC even by using a low temperature processing for the LSC using the infiltration method greatly undermines the motivation to continue the exploration of the combination of these materials for use in solid oxide fuel cells. © 2012 Elsevier B.V. All rights reserved

KW - Scanning electron microscopy

KW - Infiltration

KW - Cathode

KW - SOFC

KW - Electrochemical impedance spectroscopy

U2 - 10.1016/j.ssi.2012.01.027

DO - 10.1016/j.ssi.2012.01.027

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

VL - 211

SP - 74

EP - 79

ER -