Bi-component semiconductor oxide photoanodes for the photoelectrocatalytic oxidation of organic solutes and vapours: A short review with emphasis to TiO2-WO3 photoanodes

► The principle of photoelectrocatalytic water and air treatment is presented. ► The preparation methods of semiconductor oxides are reviewed. ► The synergism in binary semiconductor oxide photoanodes is discussed. ► The photoelectrocatalytic activity of TiO2-WO3 photoanodes is reviewed. ► All-solid photoelectrochemical cells for air treatment are discussed.