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The Effect of lanthanum(III) and cerium(III) Ions Between Layers of Manganese Oxide on Water Oxidation

The Effect of lanthanum(III) and cerium(III) Ions Between Layers of Manganese Oxide on Water Oxidation

Mohammad Mahdi Najafpour, Mohsen Abbasi Isaloo, Małgorzata Hołyńska, Jian-Ren Shen, Suleyman I Allakhverdiev

Photosynth Res. 2015 Dec;126(2-3):489-98.

PMID: 25701552

Abstract:

Manganese oxide structure with lanthanum(III) or cerium(III) ions between the layers was synthesized by a simple method. The ratio of Mn to Ce or La in samples was 0.00, 0.04, 0.08, 0.16, 0.32, 0.5, 0.82, or 1.62. The compounds were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction studies, and atomic absorption spectroscopy. The compounds show efficient catalytic activity of water oxidation in the presence of cerium(IV) ammonium nitrate with a turnover frequency of 1.6 mmol O2/mol Mn.s. In contrast to the water-oxidizing complex in Photosystem II, calcium(II) has no specific role to enhance the water-oxidizing activity of the layered manganese oxides and other cations can be replaced without any significant decrease in water-oxidizing activities of these layered Mn oxides. Based on this and previously reported results from oxygen evolution in the presence of H 2 (18) O, we discuss the mechanism and the important factors influencing the water-oxidizing activities of the manganese oxides.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1312818	Lanthanum(III) oxide		1312-81-8	Price

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