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Issue 19, 2017
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A new strategy to make an artificial enzyme: photosystem II around nanosized manganese oxide

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Abstract

Herein we report a new strategy to disperse Mn oxide into the apoenzyme of photosystem II. The compound was characterized by scanning electron microscopy, transmission electron microscopy, UV-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray absorption near edge structure, extended X-ray absorption fine structure, X-ray diffraction and some electrochemical methods. Under electrochemical conditions, the peaks attributed to Mn(II)/(III), Mn(III)/(IV) and Mn(II)/(IV) were assigned and compared with other manganese oxides. Linear sweep voltammetry shows that water electro-oxidation occurs at 80 mV less than that for the apoenzyme of photosystem II. Thus, Mn oxide maintains its water-oxidizing activity under these conditions. The compound is a new type of structural and functional model for the water-oxidizing complex in photosystem II.

Graphical abstract: A new strategy to make an artificial enzyme: photosystem II around nanosized manganese oxide

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Publication details

The article was received on 14 Aug 2017, accepted on 15 Aug 2017 and first published on 07 Sep 2017


Article type: Paper
DOI: 10.1039/C7CY01654A
Citation: Catal. Sci. Technol., 2017,7, 4451-4461
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    A new strategy to make an artificial enzyme: photosystem II around nanosized manganese oxide

    M. M. Najafpour, S. Madadkhani, S. Akbarian, M. Hołyńska, M. Kompany-Zareh, T. Tomo, J. P. Singh, K. H. Chae and S. I. Allakhverdiev, Catal. Sci. Technol., 2017, 7, 4451
    DOI: 10.1039/C7CY01654A

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