Industrialization of electro-oxidizing Cerium(III) to Cerium(IV) has been a important project for long time because of its low cost, no chemical oxidation agents used and no pollution to rare earths productions. Many factories focus on this method to reduce the process cost to deal with the price drop of cerium products special for recent years. The oxidation of Cerium(III) to Cerium(IV) had been unsuccessfully used in sulfuric acid solution in spite of nitric acid media for low solubility of rare earths su...