Optimized energy conversion efficiency in solid-oxide fuel cells implementing SrMo1−xFexO3−δ perovskites as anodes

► Novel SrMo1−xFexO3−δ oxides are prepared and characterized by a number of techniques. ► Use of these oxides as anodes in SOFC doubles the performance of standard cermets. ► In situ neutron diffraction helps to understand the extraordinary performance: oxygen vacancies are created upon heating.