Used as a pigment in ceramics and glass due to its ability to produce dark blue to black colors at high temperatures. Also employed in the production of magnetic recording media and magnetic materials for electronics due to its magnetic properties. Serves as a component or precursor in battery electrodes, particularly in lithium-ion battery cathodes, contributing to improved electrochemical performance. Acts as a catalyst in industrial oxidation processes, such as the decomposition of toxic gases or oxidation of organic compounds, and in the synthesis of other cobalt-based materials. Additionally, used in surface coatings to prevent corrosion and enhance metal hardness.