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Title: Enhancement of SOFC Cathode Electrochemical Performance Using Multi-Phase Interfaces

Abstract

This work explored the use of oxide heterostructures for enhancing the catalytic and degradation properties of solid oxide fuel cell (SOFC) cathode electrodes. We focused on heterostructures of Ruddlesden-Popper and perovskite phases. Building on previous work showing enhancement of the Ruddlesden-Popper (La,Sr) 2CoO 4 / perovskite (La,Sr)CoO 3 heterostructure compared to pure (La,Sr)CoO 3 we explored the application of related heterostructures of Ruddlesden-Popper phases on perovskite (La,Sr)(Co,Fe)O 3. Our approaches included thin-film electrodes, physical and electrochemical characterization, elementary reaction kinetics modeling, and ab initio simulations. We demonstrated that Sr segregation to surfaces is likely playing a critical role in the performance of (La,Sr)CoO 3 and (La,Sr)(Co,Fe)O 3 and that modification of this Sr segregation may be the mechanism by which Ruddlesden-Popper coatings enhance performances. We determined that (La,Sr)(Co,Fe)O 3 could be enhanced in thin films by about 10× by forming a heterostructure simultaneously with (La,Sr) 2CoO 4 and (La,Sr)CoO 3. We hope that future work will develop this heterostructure for use as a bulk porous electrode.

Authors:
 [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1253141
DOE Contract Number:  
FE0009435
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Morgan, Dane. Enhancement of SOFC Cathode Electrochemical Performance Using Multi-Phase Interfaces. United States: N. p., 2015. Web. doi:10.2172/1253141.
Morgan, Dane. Enhancement of SOFC Cathode Electrochemical Performance Using Multi-Phase Interfaces. United States. doi:10.2172/1253141.
Morgan, Dane. Wed . "Enhancement of SOFC Cathode Electrochemical Performance Using Multi-Phase Interfaces". United States. doi:10.2172/1253141. https://www.osti.gov/servlets/purl/1253141.
@article{osti_1253141,
title = {Enhancement of SOFC Cathode Electrochemical Performance Using Multi-Phase Interfaces},
author = {Morgan, Dane},
abstractNote = {This work explored the use of oxide heterostructures for enhancing the catalytic and degradation properties of solid oxide fuel cell (SOFC) cathode electrodes. We focused on heterostructures of Ruddlesden-Popper and perovskite phases. Building on previous work showing enhancement of the Ruddlesden-Popper (La,Sr)2CoO4 / perovskite (La,Sr)CoO3 heterostructure compared to pure (La,Sr)CoO3 we explored the application of related heterostructures of Ruddlesden-Popper phases on perovskite (La,Sr)(Co,Fe)O3. Our approaches included thin-film electrodes, physical and electrochemical characterization, elementary reaction kinetics modeling, and ab initio simulations. We demonstrated that Sr segregation to surfaces is likely playing a critical role in the performance of (La,Sr)CoO3 and (La,Sr)(Co,Fe)O3 and that modification of this Sr segregation may be the mechanism by which Ruddlesden-Popper coatings enhance performances. We determined that (La,Sr)(Co,Fe)O3 could be enhanced in thin films by about 10× by forming a heterostructure simultaneously with (La,Sr)2CoO4 and (La,Sr)CoO3. We hope that future work will develop this heterostructure for use as a bulk porous electrode.},
doi = {10.2172/1253141},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {9}
}