Abstract
Different manganese oxides have been widely reported as catalysts for water oxidation. However, the best structure of Mn oxides for electrocatalytic water oxidation is still under debate. The convergence of different physical properties in those Mn oxides makes the assignment of the origin of the activity becoming confused. To eliminate the diverse influence factors among the Mn oxides for water oxidation, three sister Mn oxides (Mn2O3, Mn3O4, and MnO) are synthesized from the same parent precursor. The autologous Mn oxides have similarities in general physical properties, and the difference in phase structure becomes the only significant factor of their diversity. Through electrochemical analysis, Mn2O3 has the best catalytic performance among the Mn oxides. Based on this ideal platform, it is straightforwardly observed that the easy generation of MnIII in Mn2O3 is the origin of the higher catalytic activity for water oxidation.
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