Influence of Ag on the chemical and thermal compatibility of LSCF-SDCC for LT-SOFC

Agun, Linda and Abu Bakar, Muhammad Subri and Ahmad, Sufizar and Andanastuti, Muchtar and Abd Rahman, Hamimah (2014) Influence of Ag on the chemical and thermal compatibility of LSCF-SDCC for LT-SOFC. In: International Integrated Engineering Summit (IIES 2014), 1-4 December 2014, Universiti Tun Hussein Onn Malaysia, Johor.

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Abstract

In addition to the good electrochemical performance criteria in solid oxide fuel cell (SOFC) applications, cathode material must match thermal expansion with other SOFC components. Thus, effects of Ag on thermal mismatch, chemical reactions, and microstructure are investigated. Ag (1 wt% to 5 wt. %) was mixed with La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF6428) and Sm-doped ceria carbonate (SDCC) composite cathode powder. LSCF6428-SDCC-Ag samples were sintered at 600 °C for 2 h. The thermal expansion coefficients (TECs), which were determined using a dilatometer, indicated relatively less TEC mismatch between LSCF-SDCC-Ag cathodes composite and SDCC electrolyte. The average TEC value obtained from 20 °C to 600 °C implied that LSCF-SDCC-A5 (5 wt. % Ag) showed better thermal matching (13.18×10−6 K−1) with SDCC electrolyte (12.84×10−6 K−1) and achieved better compatibility. The X-ray diffraction patterns indicated that the LSCF6428-SDCC-Ag peak increased with the increase in the amount of Ag. Scanning electron microscopy analysis showed that Ag was capable of maintaining the porosity that is required for cathodes (20%–40%). Results showed that Ag exhibited desirable thermal and chemical compatibility with LSCF-SDCC. Thus, LSCF6428-SDCC-Ag can be used as a composite cathode for low-temperature SOFCs

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:LSCF; silver; thermal expansion; LT-SOFC
Subjects:T Technology > TP Chemical technology > TP785-869 Clay industries. Ceramics. Glass
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Materials Engineering and Design
ID Code:6398
Deposited By:Mrs. Nurhayati Ali
Deposited On:08 Mar 2015 15:00
Last Modified:27 May 2015 16:33

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