Synthesis and characterization of Mn oxides on the surface of nanoparticles such as KAl3(SO4)(2)(OH)(6), CO3O4, CuO, Fe3O4, MgO, NiO, SiO2, SnO2, TiO2, WO3, zeolite, ZnO, and ZrO2 have been reported previously. Herein, we reported the effect of support on the water oxidizing activity of amorphous Mn oxides in the presence of cerium(IV) ammonium nitrate. We found that the efficiency of systems toward water oxidation depends on the nature of the support, and a significant effect was observed in the case of redox-active supports. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.