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Exploring fundamentals of CoO and 2D rocksalt metal oxides
Block, Claire E. Stuewe, Rose L. Mansfield, Elisabeth Richards, Ryan
Block, Claire E.
Stuewe, Rose L.
Mansfield, Elisabeth
Richards, Ryan
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2023-04
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Abstract
Due to a high surface area to volume ratio, nanomaterials have a wide variety of applications in catalysis, renewable energy, and more. Aside from controlling the composition to achieve desired properties, a critical aspect of synthesis to control is the morphology of the nanomaterial. Different particle shapes will expose different crystal facets, resulting in different surface energies and chemical reactivities. Therefore, controlling the final shape and structure of a nanomaterial is just as important as the composition. Cobalt oxide is a material of interest for its catalytic properties in decomposition of compounds, lithium battery anodes, and CO oxidation. Nickel oxide, geometrically very similar to cobalt oxide, retains unknown differences between the resulting compounds from synthesis methods used for the two oxides. The synthesis method presented on here successfully makes NiO (111) facet by using an autoclave with supercritical drying for easy sample retrieval; cobalt precursors were substituted for nickel precursors to make various cobalt oxides. This project explores how adjusting temperatures affects the resulting morphology of cobalt oxide. The autoclave and post-synthesis heat treatment temperatures were varied to investigate the resulting cobalt oxide compound and the morphology. The results demonstrating the relationship between temperature and morphology will be presented here. Future work will focus on performing preliminary catalytic studies of the different nanostructures for CO2 capture and electrolysis. This work contributes to furthering knowledge about the relationships between synthesis method, nanomaterial morphology, temperature, and material properties of cobalt oxides, a promising material for a more sustainable society.
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