Peroxocarbonate
In chemistry, peroxocarbonate is a divalent anion with formula CO2−
4. It is an oxocarbon anion that consists solely of carbon and oxygen. It would be the anion of a hypothetical peroxocarbonic acid HO–CO–O–OH.
The peroxocarbonate anion is formed, together with peroxodicarbonate C
2O2−
6, at the negative electrode during electrolysis of molten lithium carbonate. Lithium peroxocarbonate can be produced also by combining carbon dioxide CO2 with lithium hydroxide in concentrated hydrogen peroxide H2O2 at −10 °C.