A new parameter, the normalized current efficiency for the electro-combustion has been considered. This parameter allows to eliminate the mass transfer inefficiency and then can be defined as the ability of the anode to promote the electro-oxidn. and to reduce the side reaction of oxygen evolution. It has been shown that the normalized current efficiency highly depends on both anode material and org. species. The electrochem. behavior of lead dioxide and synthetic boron-doped diamond thin film electrode (BDD) has been studied in acid media contg. 4-chlorophenol by bulk electrolysis under different exptl. conditions with the use of normalized current efficiency. [on SciFinder (R)]