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Title: Toward Stabilizing Co 3O 4 Nanoparticles as an Oxygen Reduction Reaction Catalyst for Intermediate-Temperature SOFCs

The oxygen reduction reaction (ORR) activity of a series of composite cathodes consisting of a porous Gd 0.20Ce 0.80O 2-δ (GDC) scaffold infiltrated with Sr-, Co-, and Y-nitrate solutions has been systematically investigated in this study. The results show that such infiltrated cathodes if calcined at low temperatures such as 350°C exhibit low polarization resistance (RP) in the temperature range of 450–700°C, even though XRD analysis reveals that the calcined product is virtually a mixture of Co 3O 4 and SrCO 3. A further study by design-of-experiment suggests that the true ORR-active species is Co 3O 4, whereas SrCO 3 serves as a sintering inhibitor to preserve the high surface area of Co 3O 4. The findings and understanding in this study present a new strategy for future development of active cathodes for intermediate-temperature solid oxide fuel cells (SOFCs).
Authors:
 [1] ; ORCiD logo [2] ;  [2] ;  [1]
  1. Univ. of South Carolina, Columbia, SC (United States). Department of Mechanical Engineering
  2. Univ. of Pennsylvania, Philadelphia, PA (United States). Department of Chemical and Biomolecular Engineering
Publication Date:
Grant/Contract Number:
AR0000492; FE0023317
Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 10; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Research Org:
Univ. of South Carolina, Columbia, SC (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; coarsening; cobalt oxide; oxygen electrocatalysis; sintering resistance; solid oxide fuel cell
OSTI Identifier:
1424749