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Solar thermochemical hydrogen production (STCH) is a renewable alternative tohydrogen produced using fossil fuels. While serial bulk experimental methodscan accurately measure STCH performance, screening chemically complex materialssystems for new promising candidates is more challenging. Here we identifydouble-site Ce-substituted (Ba,Sr)MnO3 oxide perovskites as promising STCHcandidates using a combination of bulk synthesis and high-throughput thin filmexperiments. The Ce substitution on the B-site in 10H-BaMnO3 and on the A-sitein 4P-SrMnO3 lead to 2-3x higher hydrogen production compared to CeO2, butthese bulk single-site substituted perovskites suffer from incompletereoxidation. Double-site Ce substitution on both A- and B-site in (Ba,Sr)MnO3thin films increases Ce solubility and extends the stability of 10H and 4Pstructures, which is promising for their thermochemical reversibility. Thisstudy demonstrates a high-throughput experimental method for screening complexoxide materials for STCH applications.

Double-site Substitution of Ce into (Ba, Sr)MnO3 Perovskites for Solar Thermochemical Hydrogen Production