| Summary: | This review is devoted to the application of Sr<sub>2</sub>FeMoO<sub>6−δ</sub> (SFM) and Sr<sub>2</sub>F<sub>1.5</sub>Mo<sub>0.5</sub>O<sub>6−δ</sub> (SF<sub>1.5</sub>M) in La<sub>1−x</sub>Sr<sub>x</sub>Ga<sub>1−y</sub>Mg<sub>y</sub>O<sub>3−δ</sub> (LSGM)-based SOFCs. We consider the most relevant physical properties (crystal structure, thermodynamic stability, iron and molybdenum valence states, oxygen vacancy formation and oxygen non-stoichiometry, electrical conductivity), A- and B-site ion substitution, and the performance of SF<sub>1+<i>x</i></sub>M SOFCs (polarization resistance, operation with hydrogen, operation with hydrocarbons and methanol). Their properties can be tailored to a particular application by the substitution of different metal cations into their lattices. SF<sub>1+<i>x</i></sub>M materials are excellent catalysts in hydrocarbon oxidation and can prevent carbon deposition due to the ability to exchange lattice oxygen with the gaseous phase. Moreover, they are sulfur tolerant. This opens the way to direct hydrocarbon-fueled SOFCs, eliminating the need for external fuel reforming and sulfur removal components. Such SOFCs can be greatly simplified and operate with much higher overall efficiency, thus contributing to the solution to the lack of energy problem in our modern world.
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