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1995 (1)
1Author    Irene Scheler, DietrichW. WabnerRequires cookie*
 Title    Impedance Measurements to Determine the Influence of Fluoride at Platinum Anodes During the Formation of Peroxodisulfate  
 Abstract    The electrode reactions at platinum anodes in 1.5 M H2S 0 4 + 2.3 M (N H 4)2S 0 4 solution with and without addition o f NaF (0.5 M) have been examined. Impedance spectra between 1 to 100.000 Hz were measured under galvanostatic conditions. Electrolyte, polarization, charge-transfer resistance (Rd), double-layer capacitance (CD) and inductance (L) were determined. For a constant current density, fluoride causes an increase o f CD and a decrease o f RD. At a certain potential (measured and corrected by the electrolyte resistance) CD nearly remains the same with and without fluoride, whereas RD is slightly increased by fluoride. This behaviour is explained by the double function o f the fluoride: It is adsorbed on the anode surface and causes an increase o f the real current density on the surface. Simultaneously, the evolution o f oxygen is hindered by fluoride. 
  Reference    Z. Naturforsch. 50b, 1717—1722 (1995); received May 26 1995 
  Published    1995 
  Keywords    Persulfate Production, Impedance Spectroscopy, Fluoride, Platinum Electrodes 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1717.pdf 
 Identifier    ZNB-1995-50b-1717 
 Volume    50