Abstract: A new method for direct electrosynthesis of solid potassium ferrate (K₂FeO₄) in KOH solution using potas-sium iodide (KI) as additive was put forward.Fe electrode and K₂FeO₄ sample were characterized by means of CV,EDX,IR,and SEM etc..Results showed that using the additive during synthesis could result in the highest current efficiency of 76.6%,product purity of 95.3%~97.8%,and a yield of 66 g/L  K₂FeO₄ at 65 ℃;and the current density could be enhanced from 2.5 mA/cm² to 4.5 mA/cm²,which is 80% higher than that of the blank sample when keeping current efficiency over 63%.EDX and IR results indicated K₂FeO₄ sample obtained by using additive contained little iodine and appeared longer polyhedron in shape than that of the blank sample.  

Key words: potassium ferrate, KI additive, electrosynthesis, current efficiency, KOH