High-entropy perovskite oxides for direct solar-driven thermochemical CO2 splitting.

The global energy crisis and climate change have fueled interest in solar-driven thermochemical CO 2 splitting as a potential solution. However, conventional materials like CeO 2 encounter limitations attributable to their low solar absorptivity and CO yield (even at high reduction temperatures), exerting a detrimental influence on both solar energy utilization and process efficiency. This study proposes high-entropy A-site doped perovskites as a potential solution for efficient solar thermochemical CO 2 splitting. The increased configurational entropy enhances the solar thermal CO 2 splitting cycles by decreasing oxygen vacancy formation energy and lattice oxygen migration energy barrier. This is supported by experimental results, where Sm 0.25 Sr 0.25 Ca 0.25 La 0.25 MnO 3 achieved a maximum CO yield of 764.76 μmol g−1 with low temperature difference between the reduction and oxidation steps, marking an important progress in solar thermal CO 2 splitting cycles. The study demonstrates the potential of high-entropy perovskites for direct solar energy harvesting with high spectrum absorption coefficients and sustainable CO 2 utilization. [ABSTRACT FROM AUTHOR]