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Issue 34, 2014
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The role of nano-sized manganese oxides in the oxygen-evolution reactions by manganese complexes: towards a complete picture

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Abstract

Eighteen Mn complexes with N-donor and carboxylate ligands have been synthesized and characterized. Three Mn complexes among them are new and are reported for the first time. The reactions of oxygen evolution in the presence of oxone (2KHSO5·KHSO4·K2SO4) and cerium(IV) ammonium nitrate catalyzed by these complexes are studied and characterized by UV-visible spectroscopy, X-ray diffraction spectrometry, dynamic light scattering, Fourier transform infrared spectroscopy, electron paramagnetic resonance spectroscopy, transmission electron microscopy, scanning electron microscopy, membrane-inlet mass spectrometry and electrochemistry. Some of these complexes evolve oxygen in the presence of oxone as a primary oxidant. CO2 and MnO4 are other products of these reactions. Based on spectroscopic studies, the true catalysts for oxygen evolution in these reactions are different. We proposed that for the oxygen evolution reactions in the presence of oxone, the true catalysts are both high valent Mn complexes and Mn oxides, but for the reactions in the presence of cerium(IV) ammonium nitrate, the active catalyst is most probably a Mn oxide.

Graphical abstract: The role of nano-sized manganese oxides in the oxygen-evolution reactions by manganese complexes: towards a complete picture

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Publication details

The article was received on 07 May 2014, accepted on 30 Jun 2014 and first published on 02 Jul 2014


Article type: Paper
DOI: 10.1039/C4DT01367K
Citation: Dalton Trans., 2014,43, 13122-13135
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    The role of nano-sized manganese oxides in the oxygen-evolution reactions by manganese complexes: towards a complete picture

    M. M. Najafpour, M. Hołyńska, A. N. Shamkhali, S. H. Kazemi, W. Hillier, E. Amini, M. Ghaemmaghami, D. Jafarian Sedigh, A. Nemati Moghaddam, R. Mohamadi, S. Zaynalpoor and K. Beckmann, Dalton Trans., 2014, 43, 13122
    DOI: 10.1039/C4DT01367K

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