Correlating oxygen mobility with thermochemical CO2-splitting efficiency in A-site substituted manganite perovskites

The effect of lattice geometric parameters of perovskite oxides on thermochemical redox CO2-splitting process is highlighted. Experimentally-derived amounts of O-2 and CO evolved were found to correlate with critical radius per unit cell volume (R-c.u) and specific free volume (V-F.S), respectively, in a series of phase pure A-site substituted perovskites. These findings demonstrate the possibility of designing new oxygen carrier materials based on geometric parameters while predicting their CO2-splitting activity during two-step cycles.