The electrochemical response of manganese hydroxide—oxide films in slightly alkaline solutions—I. The redox couple

Ubeda, M. Hernández; Mishima, H.; Mishima, B. A. López de

doi:10.1016/0013-4686(91)85309-u

Cited by 9 publications

(1 citation statement)

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“…Peak C2 exhibits reduction of MnOOH to Mn(OH)2. 24 The anodic counterpart of C2 is not detected in cyclic voltammograms; this redox process is discussed in more detail below. The redox reaction taking place at the Al/Cl wave may be represented as7"23 MnO,(OH), + zH 2 O + ze-= MnO, -(OH),,+ + z OH [1] Reaction 1 shows a certain degree of chemical reversibility, which allows the anodic and/or cathodic processes to be identified by electrochemical techniques.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Oxidation of Mn ( OH ) 2 in Alkaline Media

Cha

Park

1997

J. Electrochem. Soc.

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Redox transformations of the Mn(II)/Mn(III) and Mn(II)/Mn(IV) pairs have been studied by transient electrochemical, spectroelectrochemical, and impedance measurements in alkaline solutions at a manganese electrode. The Mn(0)/Mn(II) and Mn(II)/Mn(III) pairs, which have not been clearly identified hitherto in the literature, have been observed using these techniques. A species observed at 285 nm during oxidation of the Mn(OH)2-covered manganese electrode was assigned to MnOOH. This species eventually led to passive films whose major component is MnO, absorbing at about 400 nm. An accumulation of the passive films was observed at longer electrolysis times. Electrochemical impedance measurements were used to construct a Tafel plot for the manganese oxidation. The polarization resistance reached a minimum at about +0.17 V vs. AglAgCl (saturated KC1) without oxygen evolution. Some kinetic information including resistance-capacitance time constants for the oxidation reaction and an exchange current density are also reported.

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Section: Resultsmentioning

confidence: 99%