Used as a precursor in the synthesis of cobalt oxide materials for lithium-ion battery cathodes. Employed in electroplating baths to deposit cobalt metal coatings for wear and corrosion resistance. Acts as a catalyst in petroleum refining and organic oxidation reactions. Utilized in the production of pigments for ceramics and glass, imparting blue to green colors. Applied in textile industry as a mordant to fix dyes onto fabrics. Serves as a drying agent in paints and varnishes due to its ability to accelerate oxidation of drying oils. Also used in analytical chemistry for qualitative detection of aluminum and in the preparation of other cobalt salts.