Nanolayered manganese oxides as water-oxidizing catalysts: the effects of Cu(ii) and Ni(ii) ions

Abstract

We synthesized nanolayered manganese oxides by the reaction of Mn(CH₃COO)₂·4H₂O and KMnO₄ in the presence of copper(II) or nickel(II) ions. The compounds were synthesized, and characterized by scanning electron microscopy, transmission electron microscopy, powder diffractometry and atomic absorption spectroscopy. Water-oxidizing activities of these oxides in the presence of cerium(IV) ammonium nitrate as a non-oxo transfer oxidant are reported. The results and proposed important factors influencing the water-oxidizing activities of these oxides are also discussed.