Selective Ion Permeability of Manganese Oxides Prepared with an Electrosynthesis

DOI Web Site Web Site 33 References

Bibliographic Information

Other Title
  • 電気化学的に合成したマンガン酸化物の選択的イオン透過性
  • デンキ カガクテキ ニ ゴウセイ シタ マンガン サンカブツ ノ センタクテキ イオン トウカセイ

Search this article

Abstract

<p>The membrane potentials of γ-MnO2 and Mn3O4, which were electrochemically prepared on Pt mesh, were measured in neutral aqueous solutions of KCl, KNO3, NaCl and Na2SO4 at 25°C to examine the transport numbers of the electrolyte ions in the Mn oxides. In these solutions, the cation transport numbers, t+, in γ-MnO2 were 0.62∼0.73, which were larger than those (0.38∼0.51) in the bulk solutions. On the other hand, the anion transport numbers, t–, in Mn3O4 were 0.62∼0.79, which were larger than those (0.49∼0.62) in the bulk solutions. The above results indicated that γ-MnO2 was cation-selective, whereas Mn3O4 was anion-selective. The difference in selective ion permeability between γ-MnO2 and Mn3O4 was explained in terms of the difference in sign of surface electric charge, depending on zero point of charge (zpc) of Mn oxides and pH of the used solutions.</p>

Journal

  • Electrochemistry

    Electrochemistry 67 (4), 377-380, 1999-04-05

    The Electrochemical Society of Japan

References(33)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top