Used as a catalyst in oxidation reactions, particularly in the production of terephthalic acid from p-xylene. Also employed as a catalyst in synthetic rubber production, such as polybutadiene, to enhance cross-linking efficiency and improve mechanical properties.

Acts as a drying agent in paints, varnishes, and inks by accelerating the absorption of oxygen from the air, promoting faster film formation.

Serves as a precursor in the synthesis of other cobalt-containing compounds used in batteries, electroplating baths (to enhance corrosion resistance), and the fuel industry.

Functions as a colorant in ceramics, glass, paints, and ceramic coatings, imparting blue to green hues with improved color durability and consistency.

Utilized in animal feed as a source of cobalt for ruminant nutrition, supporting vitamin B12 synthesis.

In research and laboratories, used as a source of Co(II) for synthesizing coordination compounds and studying magnetic or optical properties of materials.