PERFORMA ELEKTROKIMIA KOMPOSIT KATODA BERBASIS La0,6 Sr0,4 Co0,2 Fe0,8 O3-δ UNTUK SOLID OXIDE FUEL CELL BERSUHU RENDAH

Abstract

PERFORMA ELEKTROKIMIA KOMPOSIT KATODA BERBASIS La0,6Sr0,4Co0,2Fe0,8O3-δ UNTUK SOLID OXIDE FUEL CELL BERSUHU RENDAH. Komposit katoda bernasis bahan perovskite La0,6Sr0,4Co0,2Fe0,8O3-δ (LSCF) telah diteliti untuk aplikasi solid oxide fuel cell bersuhu rendah (LT-SOFC) dengan samarium terdoping cerium (SDC) - karbonat sebagai elektrolit. Serbuk LSCF di sintesis menggunakan teknik sol-gel. Selanjutnya komposit katoda LSCF-SDC karbonat disiapkan dengan mencampurkan LSCF dengan elektrolit SDC-karbonat dengan teknik reaksi keadaan padat dalam berbagai komposisi, yaitu 30% berat, 40% berat dan 50% berat. Komposit katoda dilakukan beberapa karakterisasi seperti morfologi, struktur fasa dan koefisien ekspansi panas serta performa elektrokimia selnya. Nilai koefisien ekspansi panas katoda mendekati elektrolit ketika jumlah campuran elektrolit SDC-karbonat dalam komposit katoda naik. Diantara katoda yang diselidiki, 70LSCF - 30SDC7030 memperlihatkan performa sel yang terbaik, yaitu 60,26 mW/cm2 dan 75,33 mW/cm2 pada masing-masing 600°C dan 650°C.

ELECTROCHEMICAL PERFORMANCE OF La0.6Sr0.4Co0.2Fe0.8O3-δ BASED CATHODES FOR LOW TEMPERATURE SOLID OXIDE FUEL CELLS. Composite cathodes based on perovskite, La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF), were investigated as cathodes for low-temperature solid-oxide fuel cells with samarium-doped cerium (SDC)-carbonate electrolytes. The LSCF powder was synthesized via the sol-gel technique. The LSCF-SDC-carbonate composite cathode was subsequently prepared by mixing the LSCF with the SDC-carbonate electrolyte through solid-state reaction in various compositions, i.e., 30wt%, 40wt%, and 50wt%. The composite cathode was characterized in terms of its morphology, phase structure, and thermal expansion coefficient, as well as the electrochemical performance of the cells. The thermal expansion of the cathode approached that of the electrolyte when the amount of the SDC-carbonate electrolyte in the composite cathode was increased. Among the cathodes investigated, 70LSCF-30SDC7030 showed the best cell performance of 60.26 mW/cm2 to 75.33 mW/cm2 at 600°C to 650°C, respectively.