Kinetics and Mechanism of the DischargeIonization of Manganese in an Ammonium Chloride Solution

L. F. Kozin, N. V. Mashkova, and F. D. Manilevich

V.I. Vernadskii Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine,

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Received May 10, 2006

Abstract — Analysis of the cathodic and anodic polarization curves recorded on manganese in a 2.0 M MnCl₂ + 2.0 NH₄Cl solution (pH 5.5 0.1 and t = 18 to 60C) reveals the multistage character of the discharge–ionization of manganese in such a solution involving the formation of intermediate particles. The subsequent transformation of particles proceeds via either the electrochemical redox reaction or disproportionation. The inflection points in the cathodic polarization curves originate seemingly from the change in the surface charge of the electrode on passing the zero potential.

PACS numbers: 82.45.Hk; 82.45.Qr