Abstract
The effects of KOH on the supercritical hydrothermal synthesis of cobalt oxide and manganese oxide particles are investigated using a continuous-flow reactor. Significant changes in morphology, particle size, and oxidation state are observed by adding KOH. The spinel Co3O4 phase is transformed to a rocksalt CoO phase and the pyrolusite MnO2 phase is transformed to a hausmannite Mn3O4 phase in the presence of 0.5M KOH. The average particle size of the metal oxides decreased with an addition of KOH. The OH− ions of KOH may act as a reducing agent as well as a supersaturation enhancing agent under supercritical water conditions.
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