skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Analysis of the thermal-mechanical redox stability of Nb2TiO7 and Nb1.33Ti0.67O4 for SOFC application

Journal Article · · Ceramics International
 [1];  [1];  [1];  [1];  [1];  [2]
  1. West Virginia University, Morgantown, WV (United States)
  2. GE, Global Research Center, Niskayuna, NY (United States)
+ Show Author Affiliations

Nb2TiO7 and Nb1.33Ti0.67O4 was reported as a potential anode materials for Solid Oxide Fuel Cells (SOFCs) based on their stable reversible phase transformation and high electronic conductivity. A high-temperature redox dilatometry test was developed to monitor the linear expansion or contraction of Nb2TiO7 and Nb1.33Ti0.67O4 synthesized through a solid-state route. XRD analysis confirmed the phase purity. It was found that Nb2TiO7 contracts linearly up to 0.006% in a reducing atmosphere and this contraction is reversible in nature whereas Nb1.33Ti0.67O4 expands linearly up to 1.9% in an oxidizing atmosphere which is irreversible in nature at 800 °C. In addition, the electrical conductivity of the materials was analyzed in redox atmospheres. At 800 °C, Nb2TiO7 showed an electrical conductivity of 1.35 S/cm in forming gas (5%H2/95%N2) which increases to 85 S/cm upon the reduction of Nb2TiO7 to Nb1.33Ti0.67O4.Here this study emphasizes the importance of high-temperature redox dilatometry in the development of SOFC electrode materials.

Research Organization:
General Electric Co., Boston, MA (United States); West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0026169; FE-0026169
OSTI ID:
1538089
Alternate ID(s):
OSTI ID: 1582961
Journal Information:
Ceramics International, Vol. 44, Issue 7; ISSN 0272-8842
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

References (9)

Niobia Based Rutile Materials as SOFC Anodes journal December 2001
Anode-supported planar SOFC with high performance and redox stability journal October 2010
Thermomechanical and conductivity studies of doped niobium titanates as possible current collector material in the SOFC anode journal May 2003
Composite Cathode Based on Redox-Reversible Nb 2 TiO 7 for Direct High-Temperature Steam Electrolysis journal June 2015
Structure, Conductivity, and Thermal Expansion Studies of Redox Stable Rutile Niobium Chromium Titanates in Oxidizing and Reducing Conditions journal July 2009
Mechanical properties of NiO/Ni–YSZ composites depending on temperature, porosity and redox cycling journal June 2009
Niobium based tetragonal tungsten bronzes as potential anodes for solid oxide fuel cells: synthesis and electrical characterisation journal May 1999
Double Perovskites as Anode Materials for Solid-Oxide Fuel Cells journal April 2006
Simplified processing of anode-supported thin film planar solid oxide fuel cells journal April 2005

Similar Records

Manipulation of polar order in the “empty” tetragonal tungsten bronzes: Ba{sub 4-x}Sr{sub x}Dy{sub 0.67}□{sub 1.33}Nb{sub 10}O{sub 30}, x = 0, 0.25, 0.5, 1, 2, 3
Journal Article · Mon Aug 15 00:00:00 EDT 2016 · Applied Physics Letters · OSTI ID:1538089
Composition dependent phase connectivity, dielectric and magnetoelectric properties of magnetoelectric composites with Pb(Mg{sub 1/3}Nb{sub 2/3}){sub 0.67}Ti{sub 0.33}O{sub 3} as piezoelectric phase
Journal Article · Tue Dec 15 00:00:00 EST 2009 · Materials Research Bulletin · OSTI ID:1538089
Structure and high-temperature properties of the (Sr,Ca,Y)(Co, Mn)O{sub 3-y} perovskites - perspective cathode materials for IT-SOFC
Journal Article · Wed Aug 15 00:00:00 EDT 2012 · Journal of Solid State Chemistry · OSTI ID:1538089
+6 more

Related Subjects

36 MATERIALS SCIENCE
Nb2TiO7
Nb1.33Ti0.67O4
processing
XRD
dilatometry
electrical conductivity