Mg-doped La0·3Sr0·7Mn0·8Mg0·2O3−δ cathode as a catalyst for NOx decomposition via H–SOFCs

Abstract

Proton conducting solid oxide fuel cells (H–SOFCs) with BaZr0·1Ce0·7Y0·2O3-δ as electrolyte were fabricated to couple the removal of nitrogen oxides in power generation technology. Specially, a deliberately designed cathode with the composition of La0·3Sr0·7Mn0·8Mg0·2O3−δ was prepared to realize this dual function. The results indicated that the incorporation of Mg ions in La0·3Sr0·7MnO3−δ can improve its ability to adsorb NO and the cathode activity. At 800 °C, when using the NO as oxidant, single cell with La0·3Sr0·7Mn0·8Mg0·2O3−δ cathode was able to obtain peak power density of 48 mW cm−2 and achieve the conversion of NO to N2 more than 48%. These findings suggested that power generation coupling deNO via H–SOFC is possible and La0·3Sr0·7Mn0·8Mg0·2O3−δ was a promising cathode for this application.