Linear sweep voltammetry of manganate(VII), manganate(VI), and manganate(V) in alkaline media
✍ Scribed by D.B. Freeman; G. Mamantov
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 521 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
Electrochemical reactions were assigned to the voltammetric waves obtained in alkaline KMnO, and K,MnO, solutions. Plots of i,, (AC%"') ' and i,,,,i,,,-' c'., log 1; mdicate that at slow potential scan rates in MnO, solutions ranging from 007 to O-19 F in NaOH the first step in MnO; reduction is a l-electron reversible charge transfer with no coupled chemical reaction; at fast scan rates (2 1 V s ') the process becomes quasi-reversible. The standard rate constant and the activation energy for the MnO;/MnO:-charge transfer step were estimated. Plots of i,, (AC"a"*)-' and i,,,,l,,us log o indicate that in 40 F KOH and at potential scan rates between OGO5 and 2.0 V S-' the reduction of MnO:-to MnO:-is a reversible charge transfer with no coupled chemical reaction.
The diffusion coellicients of MnO; and MnO:-in alkalme solutions are reported.