Cobalt(III) oxide is a chemical compound with the formula Co2O3. It consists of cobalt in the +3 oxidation state and oxygen. This compound appears as a dark brown or black solid and is used in various applications, including ceramics, pigments, and as a catalyst in chemical reactions. In addition to its industrial uses, cobalt(III) oxide is of interest in research for its potential applications in batteries and electronic devices. It can be produced through various methods, including thermal decomposition of cobalt salts. Proper handling is essential, as cobalt compounds can be toxic in certain forms.