title: The effect of lanthanum(III) and cerium(III) ions between layers of manganese oxide on water oxidation.
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.
authors.affiliation: Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), 45137-66731, Zanjan, Iran. mmnajafpour@iasbs.ac.ir.|Center of Climate Change and Global Warming, Institute for Advanced Studies in Basic Sciences (IASBS), 45137-66731, Zanjan, Iran. mmnajafpour@iasbs.ac.ir.
authors.forename: Mohammad Mahdi
authors.initials: MM
authors.lastname: Najafpour
authors.affiliation: Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), 45137-66731, Zanjan, Iran.
authors.forename: Mohsen Abbasi
authors.initials: MA
authors.lastname: Isaloo
authors.affiliation: Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften (WZMW), Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032, Marburg, Germany.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Hołyńska
authors.affiliation: Graduate School of Natural Science and Technology/Faculty of Science Photosynthesis Research Center, Okayama University, Okayama, 700-8530, Japan.
authors.forename: Jian-Ren
authors.initials: JR
authors.lastname: Shen
authors.forename: Suleyman I
authors.initials: SI
authors.lastname: Allakhverdiev
authors.affiliation: Controlled Photobiosynthesis Laboratory, Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, 127276, Russia. suleyman.allakhverdiev@gmail.com.|Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia. suleyman.allakhverdiev@gmail.com.|Department of Plant Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Leninskie Gory 1-12, Moscow, 119991, Russia. suleyman.allakhverdiev@gmail.com.
authors.forename: Suleyman
authors.initials: S
authors.lastname: Allakhverdiev
mesh_terms: D002412:Cations; D002563:Cerium / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009566:Nitrates / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D045332:Photosystem II Protein Complex / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D002412:Cations; D017895:Manganese Compounds; D009566:Nitrates; D010087:Oxides; D045332:Photosystem II Protein Complex; D014867:Water; D002563:Cerium; C027424:manganese oxide; D007811:Lanthanum; D010100:Oxygen; C006568:ammonium nitrate
keywords: Artificial photosynthesis; Cerium(III); Lanthanum(III); Nanolayered manganese oxide; Oxygen; Water oxidation