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Issue 17, 2016
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Highly active water oxidation on nanostructured biomimetic calcium manganese oxide catalysts

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Abstract

Water oxidation is a crucial reaction step in solar-to-chemical energy conversion processes such as photocatalytic water splitting and carbon dioxide reduction. In natural photosynthesis, the water oxidation reaction is catalyzed by μ-oxido-Mn4Ca clusters in photosystem II (PSII). Herein, we report the fabrication of nanostructured biomimetic calcium manganese oxides (CaxMnOy) via a simple process under mild conditions utilizing H2O2 as an oxidant and TMAOH (tetramethylammonium hydroxide) as an alkaline source. CaxMnOy materials with x higher than 0.26 are composed of nanoparticles with particle sizes ranging from 15 to 30 nm according to the result of HRTEM. The results of X-ray absorption fine structure (XAFS) indicate that calcium manganese oxides have similar structural motifs to the catalytically active site for water oxidation in PSII. It was also found that the content of Ca and the concentration of H2O2 in the initial mixture could affect the crystallinity and the average Mn valence state of calcium manganese oxides. Water oxidation experiments for both chemical and photocatalytic systems suggest that the disordered structure of calcium manganese oxides and a modest valence state of Mn (+3.7 to +3.8) are necessary for achieving high activity. Our method provides a strategy for synthesis and modulation of nanostructured biomimetic water oxidation catalysts.

Graphical abstract: Highly active water oxidation on nanostructured biomimetic calcium manganese oxide catalysts

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Publication details

The article was received on 13 Oct 2015, accepted on 29 Mar 2016 and first published on 29 Mar 2016


Article type: Paper
DOI: 10.1039/C5TA08217J
Citation: J. Mater. Chem. A, 2016,4, 6585-6594
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    Highly active water oxidation on nanostructured biomimetic calcium manganese oxide catalysts

    F. Rong, J. Zhao, Z. Chen, Y. Xu, Y. Zhao, Q. Yang and C. Li, J. Mater. Chem. A, 2016, 4, 6585
    DOI: 10.1039/C5TA08217J

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