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Mechanisms of PrO x Performance Enhancement of Oxygen Electrodes for Low Temperature Solid Oxide Cells

42 Pages Posted: 15 Jul 2019 Sneak Peek Status: Review Complete

See all articles by Matthew Yunching Lu

Matthew Yunching Lu

Northwestern University - Department of Materials Science and Engineering

Roberto Scipioni

Northwestern University - Department of Materials Science and Engineering

Beom-Kyeong Park

Northwestern University - Department of Materials Science and Engineering

Tianrang Yang

Northwestern University - Department of Materials Science and Engineering

Yvonne Antonia Chart

Northwestern University - Department of Materials Science and Engineering

Scott Alexander Barnett

Northwestern University - Department of Materials Science and Engineering

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Abstract

Recent developments in solid oxide cells focus on decreasing operating temperatures below 600 °C for improved cost and electrochemical stability in order to improve viability for commercialization. In this work, we improve the performance and stability of La0.6Sr0.40.2Fe0.8O3-δ (LSCF) and a recently developed electrode material, SrTi0.3Fe0.55Co0.15O3-δ (STFC), with addition of PrOx nanoparticles. Single-step PrOx infiltration improves performance of both LSCF and STFC across all tested temperatures (450 to 650 °C) with the most significant enhancements at lower temperatures. STFC modified with PrOx yields the best overall performance and stability, with the initial polarization resistance of 0.20 Ω·cm2 at 550 °C increasing over ~ 800 hours before stabilizing at 0.27 Ω·cm2. This represents a factor of ~ 10 resistance decrease compared to the LSCF electrode at 550 °C. A distribution of relaxation timesanalysis sheds light on the electrochemical mechanisms impacted by PrOx.

Keywords: Solid Oxide Cells, LSCF, STFC, Praseodymium Oxide, Infiltration, Fuel Cells

Suggested Citation

Lu, Matthew Yunching and Scipioni, Roberto and Park, Beom-Kyeong and Yang, Tianrang and Chart, Yvonne Antonia and Barnett, Scott Alexander, Mechanisms of PrO x Performance Enhancement of Oxygen Electrodes for Low Temperature Solid Oxide Cells (July 13, 2019). JOULE-D-19-00571. Available at SSRN: https://ssrn.com/abstract=3419214 or http://dx.doi.org/10.2139/ssrn.3419214
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Matthew Yunching Lu

Northwestern University - Department of Materials Science and Engineering

2145 Sheridan Road
Evanston, IL 60208
United States

Roberto Scipioni

Northwestern University - Department of Materials Science and Engineering ( email )

2145 Sheridan Road
Evanston, IL 60208
United States

Beom-Kyeong Park

Northwestern University - Department of Materials Science and Engineering ( email )

2145 Sheridan Road
Evanston, IL 60208
United States

Tianrang Yang

Northwestern University - Department of Materials Science and Engineering ( email )

2145 Sheridan Road
Evanston, IL 60208
United States

Yvonne Antonia Chart

Northwestern University - Department of Materials Science and Engineering ( email )

2145 Sheridan Road
Evanston, IL 60208
United States

Scott Alexander Barnett (Contact Author)

Northwestern University - Department of Materials Science and Engineering ( email )

2145 Sheridan Road
Evanston, IL 60208
United States

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