Characterization of cuprate based cathode structures by AC impedance

M. Cassidy; J. T S Irvine

doi:10.1149/1.3205829

Characterization of cuprate based cathode structures by AC impedance

M. Cassidy^*, J. T S Irvine

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Composites containing the cuprate Nd_1.8Ce_0.2CuO _4+δ (NCCO) have been shown to have promising behaviour for SOFC cathode applications, with performances similar to those of standard LSM based composites. It is hoped that the n-type conductivity exhibited by the NCCO may confer further operational advantages when operating at high oxygen utilizations or high cell polarisations where the local cathode oxygen partial pressure is reduced. Also, as it contains neither Mn nor Sr (both of which have been implicated in nucleating Cr deposition) it may also have benefits in terms of Cr tolerance. Candidate structures were assessed in a symmetrical half cell arrangement using both AC impedance and SEM examination. So far the best results have been obtained using the in-situ fired current collector Rp values of 0.10 Ω·cm² and 0.115 Ω·cm2 at around 750°C have been observed for cathode structures with the CGO interface or CGO electrolyte respectively.

Original language	English
Title of host publication	ECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI)
Pages	2689-2698
Number of pages	10
Volume	25
Edition	2 PART 3
DOIs	https://doi.org/10.1149/1.3205829
Publication status	Published - 1 Dec 2009
Event	11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting - Vienna, Austria Duration: 4 Oct 2009 → 9 Oct 2009

Conference

Conference	11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting
Country/Territory	Austria
City	Vienna
Period	4/10/09 → 9/10/09

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10.1149/1.3205829

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title = "Characterization of cuprate based cathode structures by AC impedance",

abstract = "Composites containing the cuprate Nd1.8Ce0.2CuO 4+δ (NCCO) have been shown to have promising behaviour for SOFC cathode applications, with performances similar to those of standard LSM based composites. It is hoped that the n-type conductivity exhibited by the NCCO may confer further operational advantages when operating at high oxygen utilizations or high cell polarisations where the local cathode oxygen partial pressure is reduced. Also, as it contains neither Mn nor Sr (both of which have been implicated in nucleating Cr deposition) it may also have benefits in terms of Cr tolerance. Candidate structures were assessed in a symmetrical half cell arrangement using both AC impedance and SEM examination. So far the best results have been obtained using the in-situ fired current collector Rp values of 0.10 Ω·cm2 and 0.115 Ω·cm2 at around 750°C have been observed for cathode structures with the CGO interface or CGO electrolyte respectively.",

author = "M. Cassidy and Irvine, {J. T S}",

year = "2009",

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doi = "10.1149/1.3205829",

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note = "11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting ; Conference date: 04-10-2009 Through 09-10-2009",

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AU - Cassidy, M.

AU - Irvine, J. T S

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N2 - Composites containing the cuprate Nd1.8Ce0.2CuO 4+δ (NCCO) have been shown to have promising behaviour for SOFC cathode applications, with performances similar to those of standard LSM based composites. It is hoped that the n-type conductivity exhibited by the NCCO may confer further operational advantages when operating at high oxygen utilizations or high cell polarisations where the local cathode oxygen partial pressure is reduced. Also, as it contains neither Mn nor Sr (both of which have been implicated in nucleating Cr deposition) it may also have benefits in terms of Cr tolerance. Candidate structures were assessed in a symmetrical half cell arrangement using both AC impedance and SEM examination. So far the best results have been obtained using the in-situ fired current collector Rp values of 0.10 Ω·cm2 and 0.115 Ω·cm2 at around 750°C have been observed for cathode structures with the CGO interface or CGO electrolyte respectively.

AB - Composites containing the cuprate Nd1.8Ce0.2CuO 4+δ (NCCO) have been shown to have promising behaviour for SOFC cathode applications, with performances similar to those of standard LSM based composites. It is hoped that the n-type conductivity exhibited by the NCCO may confer further operational advantages when operating at high oxygen utilizations or high cell polarisations where the local cathode oxygen partial pressure is reduced. Also, as it contains neither Mn nor Sr (both of which have been implicated in nucleating Cr deposition) it may also have benefits in terms of Cr tolerance. Candidate structures were assessed in a symmetrical half cell arrangement using both AC impedance and SEM examination. So far the best results have been obtained using the in-situ fired current collector Rp values of 0.10 Ω·cm2 and 0.115 Ω·cm2 at around 750°C have been observed for cathode structures with the CGO interface or CGO electrolyte respectively.

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ER -

Characterization of cuprate based cathode structures by AC impedance

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