Platinum and samaria-doped ceria (Pt-SDC) cermet cathode for low-temperature solid oxide fuel cells

Platinum (Pt) and Samaria-doped ceria (SDC) as cermet cathodes were investigated to enhance oxygen reduction reaction (ORR) kinetics in low-temperature solid oxide fuel cells (SOFCs). Pt is widely known for its high catalytic activity, whereas SDC is one of the most promising oxide ionic conductors...

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Bibliographic Details
Published in:Journal of alloys and compounds 2024-04, Vol.982, p.173755, Article 173755
Main Authors: Park, Yongchan, Lee, Hojae, Kim, Hyeontaek, Jeong, Davin, Kim, Young-Beom, Hong, Soonwook
Format: Article
Language:English
Subjects:
Co-sputtering
Oxygen reduction reaction
Platinum
Samaria-doped ceria
Solid oxide fuel cell
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Summary:Platinum (Pt) and Samaria-doped ceria (SDC) as cermet cathodes were investigated to enhance oxygen reduction reaction (ORR) kinetics in low-temperature solid oxide fuel cells (SOFCs). Pt is widely known for its high catalytic activity, whereas SDC is one of the most promising oxide ionic conductors as an LT-SOFC electrolyte. To improve both the catalytic activity and oxygen ionic transportation, a co-sputtering technique was used to fabricate a composite cathode by adjusting the elemental composition of Pt and SDC. This technique demonstrated that the Pt-SDC cermet cathode can increase the electrochemical reaction sites and offer a percolated pathway for rapid electron-ion conduction within the cermet structure. The electrochemical analysis results also revealed that the fuel cells coated with Pt-SDC cermet cathodes outperformed the pure Pt-coated fuel cells in terms of peak power density. The electrochemical impedance spectroscopy analysis indicated that the improved ORR kinetics of Pt-SDC cermet cathodes were the main reason for the improved fuel cell performance by catalyzing both electron and oxygen ion conduction. •Pt-SDC cermet cathodes were fabricated via co-sputtering technique for LT-SOFCs.•The chemical composition of cermet cathodes was controlled by RF power of SDC.•The TPB density can be enlarged by mixing the both Pt and SDC with co-sputtering.•Optimized ratio of Pt and SDC can provide the percolating path for charge transport.•Pt-SDC cermet cathode can increase the performance of fuel cell by catalyzing ORR.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2024.173755