Abstract
Co3O4 was prepared in aqueous solutions through a staged oxidation process. When the mole ratio of starting chemicals Co2+:OH− is ≤1:2 (Co2+ as a limiting reagent), the formation reaction follows the brucitelike phase to cobalt oxide-hydroxide, and then to cubic spinel. However, when the ratio of Co2+:OH− is > 1:2 (OH− as a limiting reagent), the reaction path changes to the brucite-like to hydrotalcite-like phase, and then to the spinel. Using the present method, Co3O4 can be formed at a temperature as low as 40 °C, and single-phase spinel Co3O4 can be prepared at 50 °C within hours under normal atmospheric pressure.
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Zeng, H.C., Lim, Y.Y. Synthesis of Co3O4 Spinel at Ambient Conditions. Journal of Materials Research 15, 1250–1253 (2000). https://doi.org/10.1557/JMR.2000.0181
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DOI: https://doi.org/10.1557/JMR.2000.0181