Electrochemical production of ferrate(VI) using sinusoidal alternating current superimposed on direct current : grey and white cast iron electrodes

• Published in: Electrochimica acta 1998-01, Vol.44 (4), p.547-557
• Main Authors: BOUZEK, K, LIPOVSKA, M, SCHMIDT, M, ROUSAR, I, WRAGG, A. A
• Format: Article
• Language: English
• Subjects: Applied sciences; Chemical industry and chemicals; Chemistry; Electrochemistry; Exact sciences and technology; General and physical chemistry; Industrial chemicals; Inorganic industry
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/S0013-4686(98)00174-1

The current yield during the electrochemical production of ferrate(VI) in a batch cell was measured using grey and white cast iron as working electrode materials. Sinusoidal alternating current superimposed on the direct current with a frequency varying in the range 0.1 mHz to 5 kHz was used. The amplitude (peak to peak) of the alternating current component varied from 39.8 to 91.1 mA cm super(-2) in the case of grey cast iron and 37.0 to 86.0 mA cm super(-2) in the case of white cast iron. The direct current density was maintained at a constant value of 16.0 mA cm super(-2) in both cases. A 14 M NaOH solution was used as electrolyte and the temperature range of 10-50 degree C was studied. The current yield for ferrate(VI) synthesis exhibited a maximum at frequencies varying from 0.5 mHz to 0.5 Hz and 0.5 to 5 Hz depending on the alternating current amplitude for the grey and white cast iron electrode, respectively.