Najafpour Mohammad Mahdi, Isaloo Mohsen Abbasi, Hołyńska Małgorzata, Shen Jian-Ren, Allakhverdiev Suleyman I
Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), 45137-66731, Zanjan, Iran.
Center of Climate Change and Global Warming, Institute for Advanced Studies in Basic Sciences (IASBS), 45137-66731, Zanjan, Iran.
Photosynth Res. 2015 Dec;126(2-3):489-98. doi: 10.1007/s11120-015-0098-9. Epub 2015 Feb 21.
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.
采用一种简单的方法合成了层间含有镧（III）或铈（III）离子的氧化锰结构。样品中锰与铈或镧的比例为0.00、0.04、0.08、0.16、0.32、0.5、0.82或1.62。通过扫描电子显微镜、透射电子显微镜、X射线衍射研究和原子吸收光谱对这些化合物进行了表征。在硝酸铈铵存在的情况下，这些化合物表现出高效的水氧化催化活性，周转频率为1.6 mmol O2/mol Mn·s。与光系统II中的水氧化复合物不同，钙（II）对增强层状氧化锰的水氧化活性没有特定作用，其他阳离子可以被取代，而这些层状锰氧化物的水氧化活性不会有任何显著降低。基于此以及之前报道的在H2(18)O存在下的析氧结果，我们讨论了氧化锰水氧化活性的机制和重要影响因素。
