Reductive dissolution of microparticulate manganese oxides

被引:70
作者
Bakardjieva, S [1 ]
Bezdicka, P [1 ]
Grygar, T [1 ]
Vorm, P [1 ]
机构
[1] Acad Sci Czech Republ, Inst Inorgan Chem, CZ-25068 Rez, Czech Republic
关键词
manganese oxides; reductive dissolution;
D O I
10.1007/s100089900104
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Electrochemical dissolution of immobilised microparticulate Mn(III,IV) oxides in slightly acidic solution (pH 4.4) was found to be a very general reaction, which is responsible for well-defined voltammetric peaks. Dissolution of six Mn(III,IV) oxides is initiated by the reduction of Mn(IV) to Mn(III) in the solid phase. which is followed by a massive dissolution via further reduction of Mn(III) to Mn(II), which finally yields soluble Mn2+. The reactivity of manganese oxides depends on their structure: the most reactive are amorphous (delta-MnO2) and layered structures (birnessite); more resistant toward reductive dissolution are alpha- and lambda-MnO2 and electrochemical manganese dioxide; and least reactive is beta-MnO2. Reductive dissolution of LiMn2O4 resembles that of lambda-MnO2, whereas CaMnO3 dissolves via a different reaction mechanism.
引用
收藏
页码:306 / 313
页数:8
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