Cobalt oxide is a chemical compound made up of cobalt and oxygen, commonly represented by the formula CoO or Co3O4. It appears as a black or blue powder and is used in various applications, including ceramics, batteries, and pigments. Cobalt oxide is known for its stability and resistance to heat, making it valuable in industrial processes. In addition to its industrial uses, cobalt oxide plays a role in the production of lithium-ion batteries, where it helps improve energy density and performance. It is also studied for its potential applications in catalysis and as a material for fuel cells.