Enhancing thermal-stability of metal electrodes with a sputtered gadolinia-doped ceria over-layer for low-temperature solid oxide fuel cells. Issue 7 (May 2017)

• Record Type: Journal Article
• Authors: Oh, Seongkook; Hong, Soonwook; Kim, Hyong June; Kim, Young-Beom; An, Jihwan
• Is Part Of: Ceramics international. Volume 43:Issue 7(2017)
• Page Start: 5781
• Page End: 5788
• Publication Date: 2017-05
• Subjects: Solid oxide fuel cell -- Thermal stability -- Metal electrode -- Oxide over-layer; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.01.125
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Cathodic activation loss is the dominant loss mechanism in the operation of low-temperature solid oxide fuel cells (LT-SOFCs). The thermal degradation of metallic cathodes decreases the performance of LT-SOFCs, causing practical issues in long-term operation. In this paper, we investigate the effect of the sputtered gadolinia-doped ceria (GDC) over-layer on the thermal stability of platinum (Pt) cathodes. The thermal stability of Pt cathodes with 23 nm-thick GDC over-layers significantly increased compared to that of the Pt-only cathodes after 2hrs' operation at 450 °C. (<4% vs. 17% performance degradation, respectively). Highlights: Thermal stabilization effect of sputtered GDC over-layers on Pt electrodes of low-temperature SOFC is investigated. Performance degradation of the 23 nm GDC over-layered Pt cathode decreases to 1/4 compared to Pt-only cell at 450 °C. Thermal stability enhancement of GDC over-layered electrode is due to the suppressed agglomeration of Pt surface.