Toward <Emphasis Type="Italic">Escherichia coli</Emphasis> bacteria machine for water oxidation |
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| Authors: | Mohammad Mahdi Najafpour Navid Jameei Moghaddam Leila Hassani Robabeh Bagheri Zhenlun Song " target="_blank">Suleyman I Allakhverdiev |
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| Institution: | 1.Department of Chemistry,Institute for Advanced Studies in Basic Sciences (IASBS),Zanjan,Iran;2.Center of Climate Change and Global Warming,Institute for Advanced Studies in Basic Sciences (IASBS),Zanjan,Iran;3.Research Center for Basic Sciences and Modern Technologies (RBST),Institute for Advanced Studies in Basic Sciences (IASBS),Zanjan,Iran;4.Department of Biological Sciences,Institute for Advanced Studies in Basic Sciences (IASBS),Zanjan,Iran;5.Surface Protection Research Group, Surface Department, Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo,China;6.Controlled Photobiosynthesis Laboratory, Institute of Plant Physiology,Russian Academy of Sciences,Moscow,Russia;7.Institute of Basic Biological Problems,Russian Academy of Sciences,Pushchino,Russia;8.Department of Plant Physiology, Faculty of Biology,M.V. Lomonosov Moscow State University,Moscow,Russia;9.Moscow Institute of Physics and Technology,Dolgoprudny,Russia;10.Bionanotechnology Laboratory, Institute of Molecular Biology and Biotechnology,Azerbaijan National Academy of Sciences,Baku,Azerbaijan |
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| Abstract: | Nature uses a Mn oxide-based catalyst for water oxidation in plants, algae, and cyanobacteria. Mn oxides are among major candidates to be used as water-oxidizing catalysts. Herein, we used two straightforward and promising methods to form Escherichia coli bacteria/Mn oxide compounds. In one of the methods, the bacteria template was intact after the reaction. The catalysts were characterized by X-ray photoelectron spectroscopy, visible spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, diffuse reflectance infrared Fourier transform spectroscopy, Raman spectroscopy, and X-ray diffraction spectrometry. Electrochemical properties of the catalysts were studied, and attributed redox potentials were assigned. The water oxidation of the compounds was examined under electrochemical condition. Linear sweep voltammetry showed that the onsets of water oxidation in our experimental condition for bacteria and Escherichia coli bacteria/Mn oxide were 1.68 and 1.56 V versus the normal hydrogen electrode (NHE), respectively. Thus, the presence of Mn oxide in the catalyst significantly decreased (~?120 mV) the overpotential needed for water oxidation. |
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