Publications

An a-and b-site substitutional study of srfeo3−δ perovskites for solar thermochemical air separation

Farr, Tyler P.; Nguyen, Nhu P.; Bush, Hagan E.; Ambrosini, Andrea A.; Loutzenhiser, Peter G.

An A-and B-site substitutional study of SrFeO3−δ perovskites (A’x A1−x B’y B1−y O3−δ, where A = Sr and B = Fe) was performed for a two-step solar thermochemical air separation cycle. The cycle steps encompass (1) the thermal reduction of A’x Sr1−x B’y Fe1−y O3−δ driven by concentrated solar irradiation and (2) the oxidation of A’x Sr1−x B’y Fe1−y O3−δ in air to remove O2, leaving N2 . The oxidized A’x Sr1−x B’y Fe1−y O3−δ is recycled back to the first step to complete the cycle, resulting in the separation of N2 from air and concentrated solar irradiation. A-site substitution fractions between 0 ≤ x ≤ 0.2 were examined for A’ = Ba, Ca, and La. B-site substitution fractions between 0 ≤ y ≤ 0.2 were examined for B’ = Cr, Cu, Co, and Mn. Samples were prepared with a modified Pechini method and characterized with X-ray diffractometry. The mass changes and deviations from stoichiometry were evaluated with thermogravimetry in three screenings with temperature-and O2 pressure-swings between 573 and 1473 K and 20% O2 /Ar and 100% Ar at 1 bar, respectively. A’ = Ba or La and B’ = Co resulted in the most improved redox capacities amongst temperature-and O2 pressure-swing experiments.