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Synthesizing morphology-controlled, high entropy perovskite nanomaterials for solid oxide fuel cells
McFadden Block, Claire E. Gonzalez, Sienna Kim, Youdong Richards, Ryan M. O'Hayre, Ryan
McFadden Block, Claire E.
Gonzalez, Sienna
Kim, Youdong
Richards, Ryan M.
O'Hayre, Ryan
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2024-04
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Abstract
Water splitting is important to a green energy future. Current issues with efficient water splitting include degradation of the fuel cell materials, thermal expansion, and transport through the material. Precise control of nanomaterial composition and morphology are among a materials scientist's tools to design novel low-cost and efficient materials. One way to improve material performance through controlling the composition is to create a high entropy oxide. There has been great interest in high entropy oxide systems because of the ability to combine multiple well-performing cations into one oxide phase, taking advantage of the synergistic effect. This work focuses on Ba, Sr, Ca, Co, Fe, and Mn cations (promising candidates for solid oxide fuel cell electrodes) in the perovskite ABO3 structure. Controlling the synthesis method to achieve single-phase, high entropy materials and maintaining nanomorphology will be discussed in this presentation. Aerogel synthesis is done in an autoclave with pseudo supercritical fluid drying, which allows immediate departure of the solvent and promotes nanomaterial production, resulting in a dry powder. However, subsequent calcination steps to achieve a single-phase oxide often sinters the materials, which removes the desired morphology. Different morphologies are of interest to be used in solid oxide fuel cells because it may improve performance depending on the unique surfaces that are exposed with different free energies.
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