Water Oxidation by λ-MnO2: Catalysis by the Cubical Mn4O4 Subcluster Obtained by Delithiation of Spinel LiMn2O4
- 30 July 2010
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 132 (33), 11467-11469
- https://doi.org/10.1021/ja1055615
Abstract
Nanocrystalline spinel LiMn2O4 has been prepared and treatment of LiMn2O4 with dilute nitric acid solution resulted in the delithiation of the framework, while maintaining the spinel structure, λ-MnO2. LiMn2O4 is not a catalyst for water oxidation. Upon removal of the lithium, the cubical Mn4O4 cores become active sites for oxidizing water to molecular oxygen, which was investigated with the photochemical [Ru2+(2,2′-bpy)3]/persulfate system at pH 5.8. The nanosize λ-MnO2 obtained from the nanocrystalline LiMn2O4, which was synthesized by the citrate route, shows a significantly higher water oxidation catalytic activity (Turnover Frequency: 3 × 10−5 mol O2/s/mol Mn) than that obtained via solid state reaction with micrometer and irregular particle sizes (Turnover Frequency: 5 × 10−6 mol O2/s/mol Mn).Keywords
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