Studies on the Solid Oxide Cell Perovskite Electrode Materials for Soot Oxidation Activity

Abstract

Solid oxide cell (SOC) perovskite electrode materials (BSCF (Ba<inf>0.5</inf>Sr<inf>0.5</inf>Co<inf>0.8</inf>Fe<inf>0.2</inf>O<inf>3-?</inf>), LSCF (La<inf>0.6</inf>Sr<inf>0.4</inf>Co<inf>0.2</inf>Fe<inf>0.8</inf>O<inf>3-?</inf>) and LSCM (La<inf>0.75</inf>Sr<inf>0.25</inf>Cr<inf>0.5</inf>Mn<inf>0.5</inf>O<inf>3-?</inf>)) were synthesised using microwave-assisted reverse-strike co-precipitation method and tested for soot oxidation activity. The calcined perovskite materials were characterized using FT-IR, XRD, SEM and BSE, BET and BJH and XPS analysis. The mean activation energy for soot oxidation was calculated from Ozawa plots at various heating rates (5, 10, 15 and 20 K/min) at different levels of soot conversions (T<inf>10</inf> to T<inf>90</inf>) for BSCF, LSCM and LSCF perovskite materials and was around 133 ± 11.5, 138 ± 9.9 and 152 ± 7.2 kJ/mol, respectively. Irrespective of the heating rates, BSCF material showed the lowest T<inf>50</inf> temperature than compared to other samples, and it is correlated to the presence of Fe<inf>3</inf>O<inf>4</inf> as a secondary phase. © 2019, Springer Nature Switzerland AG.