Sorption radioaktiver Isotopen an Niederschlägen XII. Elution von Spaltprodukten aus der Mangan(IV)-hydroxidsäule

Kolařík, Z.; Krtil, J.

doi:10.1135/cccc19641604

Cited by 2 publications

(8 citation statements)

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“…6c) during the third cathodic scan taken as an example. We note a slight increase in the regions corresponding to O 2 evolution (PPC 3 ) and I c peak (PIC 3 ), even in the absence of reduction, while the EM loss is about 100 g/Ᏺ in the regions of peaks II c and IV c (PIIC 3 and PIVC 3 , respectively). In the region of peak III c (PIIIC 3 ), the loss is about 20 g/Ᏺ.…”

Section: Resultsmentioning

confidence: 78%

“…We note a slight increase in the regions corresponding to O 2 evolution (PPC 3 ) and I c peak (PIC 3 ), even in the absence of reduction, while the EM loss is about 100 g/Ᏺ in the regions of peaks II c and IV c (PIIC 3 and PIVC 3 , respectively). In the region of peak III c (PIIIC 3 ), the loss is about 20 g/Ᏺ. Finally, the total effective mass loss observed between points A 3 and B 3 is about 300 g per 2 Ᏺ (Fig.…”

Section: Resultsmentioning

confidence: 78%

“…In the negative potential region (NPC 3 in Fig. 6 and NPA 3 in Fig. 7), we do not observe electrochemical reactions but a small capacitive current, I cap , and an important oxygen reduction current, I O 2 , on the I-E profile (Fig.…”

Section: Resultsmentioning

confidence: 82%

“…Published data relative to solid-state electrochemistry and X-ray diffraction (XRD) show that the mass variation during solid-state oxidation and reduction is 18 g per Mn. [3][4][5][6][7][8][9][10][11][12][13][14] As already observed in 10 M KOH solution several peaks are observed in 1 M KOH solution, but the absolute and the relative intensity of each one is different. The existence of these peaks and shoulders during reduction of Mn(IV) into Mn(II) implies that electrochemical reactions, chemical reactions (disproportionation), and physical processes (dissolution and deposition) take place.…”

Section: Discussionmentioning

confidence: 84%

“…The overall exchanged mass corresponds to (18m)Ϫ2 g/Mn. In published data, 3,4 Mn(OH) 4 is described as the most hydrated manganese dioxide variety, which corresponds to m ϭ 2. The layer structure such as birnessite allows incorporation of 1 H 2 O molecule.…”

Section: Discussionmentioning

confidence: 99%

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Voltammetric and Electrogravimetric Study of Manganese Dioxide Thin Film Electrodes: II. Chemically Deposited Films

Ratieuville¹,

Wu²,

Lincot

et al. 1999

J. Electrochem. Soc.

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Concurrent utilization of voltammetry and electrochemical quartz crystal microbalance methods for studying chemically deposited MnO 2 films in alkaline media shows the existence of matter exchange during repeated electrochemical reduction/oxidation reactions. As already observed with electrodeposited films, the mass variations during reduction and oxidation correspond to exchanges higher than 150 g per faraday. These large exchanged masses can be explained assuming that the film has an open microporous structure in which the micropores are emptied when the film is reduced to Mn(OH) 2 and filled by water molecules, K ϩ ions, and dissolved Mn polyions as the film is reoxidized to MnO 2 . Finally, the MnO 2 film acts as an electrochemical sponge. The spongingup phenomenon is due to the combined effect of the dissolution/deposit process and the conductivity variation with the applied potential.

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