Linear sweep voltammetry of manganate(VII), manganate(VI), and manganate(V) in alkaline media |
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Authors: | DB Freeman G Mamantov |
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Affiliation: | Department of Chemistry, University of Tennessee, Knoxville, TX 37916, U.S.A. |
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Abstract: | Electrochemical reactions were assigned to the voltammetric waves obtained in alkaline KMnO4 and K2MnO4 solutions. Plots of ip (AC°ν)?1 and iapicp?1 νs log ν indicate that at slow potential scan rates in MnO?4 solutions ranging from 0·07 to 0·19 F in NaOH the first step in MnO?4 reduction is a l-electron reversible charge transfer with no coupled chemical reaction; at fast scan rates (? V s?1 the process becomes quasi-reversible. The standard rate constant and the activation energy for the MnO?4/MnO2?4 charge transfer step were estimated. Plots of ip (AC°ν)?1 and iapicp?1 νs log ν indicate that in 4·O F KOH and at potential scan rates between 0·005 and 2·V s?1 the reduction of MNO2?4 to MnO3?4 is a reversible charge transfer with no coupled chemical reaction. The diffusion coefficients of MnO?4 and MnO2?4 in alkaline solutions are reported. |
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