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Title: New Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells

Abstract

Operation of SOFCs at intermediate temperatures (500-800 C) requires new combinations of electrolyte and electrode materials that will provide both rapid ion transport across the electrolyte and electrode--electrolyte interfaces and efficient electrocatalysis of the oxygen reduction and fuel oxidation reactions. This project concentrates on materials and issues associated with cathode performance that are known to become limiting factors as the operating temperature is reduced. The specific objectives of the proposed research are to develop cathode materials that meet the electrode performance targets of 1.0 W/cm{sup 2} at 0.7 V in combination with YSZ at 700 C and with GDC, LSGM or bismuth oxide based electrolytes at 600 C. The performance targets imply an area specific resistance of {approx}0.5 {Omega}cm{sup 2} for the total cell. The research strategy is to investigate both established classes of materials and new candidates as cathodes, to determine fundamental performance parameters such as bulk diffusion, surface reactivity and interfacial transfer, and to couple these parameters to performance in single cell tests. In this report, the oxygen exchange kinetics of a P2 composition are described in detail. The oxygen exchange kinetics of the oxygen deficient double perovskite LnBaCo{sub 2}O{sub 5.5+{delta}} (Ln=Pr and Nd) have been determined bymore » electrical conductivity relaxation. The high electronic conductivity and rapid diffusion and surface exchange kinetics of PBCO suggest its application as cathode material in intermediate temperature solid oxide fuel cells.« less

Authors:
Publication Date:
Research Org.:
University of Houston
Sponsoring Org.:
USDOE
OSTI Identifier:
860434
DOE Contract Number:  
FC26-03NT41960
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; BISMUTH OXIDES; CATHODES; DIFFUSION; ELECTRIC CONDUCTIVITY; ELECTRODES; ELECTROLYTES; KINETICS; OXIDATION; OXYGEN; PERFORMANCE; PEROVSKITE; RELAXATION; SOLID OXIDE FUEL CELLS; TARGETS; TRANSPORT

Citation Formats

Allan J. Jacobson. New Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells. United States: N. p., 2005. Web. doi:10.2172/860434.
Allan J. Jacobson. New Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells. United States. doi:10.2172/860434.
Allan J. Jacobson. Thu . "New Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells". United States. doi:10.2172/860434. https://www.osti.gov/servlets/purl/860434.
@article{osti_860434,
title = {New Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells},
author = {Allan J. Jacobson},
abstractNote = {Operation of SOFCs at intermediate temperatures (500-800 C) requires new combinations of electrolyte and electrode materials that will provide both rapid ion transport across the electrolyte and electrode--electrolyte interfaces and efficient electrocatalysis of the oxygen reduction and fuel oxidation reactions. This project concentrates on materials and issues associated with cathode performance that are known to become limiting factors as the operating temperature is reduced. The specific objectives of the proposed research are to develop cathode materials that meet the electrode performance targets of 1.0 W/cm{sup 2} at 0.7 V in combination with YSZ at 700 C and with GDC, LSGM or bismuth oxide based electrolytes at 600 C. The performance targets imply an area specific resistance of {approx}0.5 {Omega}cm{sup 2} for the total cell. The research strategy is to investigate both established classes of materials and new candidates as cathodes, to determine fundamental performance parameters such as bulk diffusion, surface reactivity and interfacial transfer, and to couple these parameters to performance in single cell tests. In this report, the oxygen exchange kinetics of a P2 composition are described in detail. The oxygen exchange kinetics of the oxygen deficient double perovskite LnBaCo{sub 2}O{sub 5.5+{delta}} (Ln=Pr and Nd) have been determined by electrical conductivity relaxation. The high electronic conductivity and rapid diffusion and surface exchange kinetics of PBCO suggest its application as cathode material in intermediate temperature solid oxide fuel cells.},
doi = {10.2172/860434},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Nov 17 00:00:00 EST 2005},
month = {Thu Nov 17 00:00:00 EST 2005}
}

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