Development and optimization of Lal-xCaxZn0.2Fe0.8O3-δ perovskites as novel cathodes for solid oxide fuel cell

• Main Authors: Hanifah, Annisa Fitri Nur, Saptari, Sitti Ahmiatri, Raharjo, Jarot, Damisih, Khaerudini, Deni Shidqi
• Format: Conference Proceeding
• Language: English
• Subjects: Brownmillerite; Calcium aluminum ferrite; Cathodes; Chemical reduction; Electrical resistivity; Electrochemical impedance spectroscopy; Ethanol; Low temperature; Operating temperature; Optimization; Oxygen reduction reactions; Perovskites; Roasting; Solid oxide fuel cells; Wet milling
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0106435

Perovskite-type oxide is a promising material for active oxygen reduction reaction (ORR) catalysts. It can improve solid oxide fuel cell (SOFC) performance, especially at intermediate operating temperatures. La1-xCaxZn0.2Fe0.8O3-δ (LCZF, x=0.4, 0.5, and 0.6) has been successfully synthesized using the solid state reaction method by wet milling in ethanol medium solvent for 12 h at a rotation speed of 400 rpm with the ball to powder ratio (BPR) of 20:1 and calcination temperature of 900 °C for 5 h. This study is a continuation of the development of La1-xCaxFeO3-δ (x=0.2-0.4) and La0.8Sr0.2Zn0.2Fe0.8O3-δ perovskite materials for SOFC cathode. As a preliminary study, LCZF materials were characterized by X-ray diffraction (XRD) and then its electrical conductivity performance is investigated at low temperature region to analyze its performance as a novel SOFC cathode by electrochemical impedance spectroscopy (EIS). The LCZF (x=0.4-0.6) materials exhibit cubic perovskite (Pm-3m) structure, while LCZF (x=0.4) after optimized by calcined at 1000 °C exhibits orthorombic brownmillerite (Pnma) phase. The LCZF (x = 0.5) has a smaller crystalline size (31.190 nm) and good electrical conductivity at 250 and 300 °C. As a result, the LCZF (x=0.5) is good candidate as novel cathode for SOFC.