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 Allakhverdiev

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)489-498
Number of pages10
JournalPhotosynthesis research
Volume126
Issue number2-3
DOIs
Publication statusPublished - Dec 1 2015

Keywords

  • Artificial photosynthesis
  • Cerium(III)
  • Lanthanum(III)
  • Nanolayered manganese oxide
  • Oxygen
  • Water oxidation

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

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