4.7 Article

Co-sputtered Pt/Ti alloy cathode for low-temperature solid oxide fuel cell

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 900, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163407

Keywords

Low-temperature solid oxide fuel cell; Oxygen reduction reaction; Co-sputtering; Pt-M alloy catalyst; Pt-Ti alloy

Funding

  1. Seoul National University of Science and Technology

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Modifying the electronic structure and reducing the surface energy of Pt through transition metal alloying is an effective strategy to enhance the activity and stability of Pt-based catalysts in low-temperature solid oxide fuel cells (LT-SOFCs). In this study, co-sputtered Pt/Ti alloy cathodes with varying Pt/Ti compositional ratios (Ti 0-26 at%) were fabricated and tested. The results showed that the cell with the optimal Pt/Ti alloy cathode demonstrated a five times lower degradation rate in activation resistance compared to a pure Pt cathode at 450 degrees C, resulting in a 33% enhancement in the maximum power density after 2 hours of operation. The performance enhancement of the Pt/Ti alloy cathode at elevated temperature was attributed to the formation of a catalytically active and thermally stable Pt3Ti alloy phase.
One of the effective strategies to enhance the activity and stability of the Pt-based catalysts in low-temperature solid oxide fuel cells (LT-SOFCs) is modifying the electronic structure and reducing the surface energy of Pt by transition metal alloying. Herein, co-sputtered Pt/Ti alloy cathodes for LT-SOFC with varying Pt/Ti compositional ratios (Ti 0-26 at%) are fabricated and tested. The cell constructed with the optimal (6-11 at% Ti) Pt/Ti alloy cathode shows five times lower degradation rate in activation resistance compared to a pure Pt cathode at 450 degrees C, resulting in a 33% enhancement in the maximum power density after 2 h of operation. We show that the performance enhancement of the Pt/Ti alloy cathode at elevated temperature is due to the formation of a catalytically active and thermally stable Pt3Ti alloy phase, in which coarsening is effectively prevented as opposed to its pure Pt counterpart. Moreover, we demonstrate that Pt/Ti alloy cathodes with excessive Ti content (>= 19 at%) suffer from the formation of a nonreactive TiO2 surface upon oxygen exposure at elevated temperature, which causes higher activation resistance. (c) 2021 Elsevier B.V. All rights reserved.

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