Perovskite particle of Feub>2ub>Oub>3ub>–NiO/Laub>0.8ub>Srub>0.2ub>FeOub>3ub> is proposed as an oxygen carrier.
Transition of mixed Feub>2ub>Oub>3ub>–NiO oxides to single NiFeub>2ub>Oub>4ub> enhances syngas yields.
Reinforced carrier activity and stability over repeated cycles are firstly reported.
Enabling a looping process of CHub>4ub> reforming-decomposition with COub>2ub> conversion.