A new polypyrrole/maghemite hybrid as a lithium insertion electrode |
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| Institution: | 1. Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), 87 Avenue du Dr. A. Schweitzer, 33608 Pessac, France;2. National Nanohybrid Materials Laboratory, School of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-747, South Korea;1. Department of Biodiversity and Ecologic Restoration, Instituto Pirenaico de Ecología (IPE-CSIC), Avda. Nuestra Señora de la Victoria 16, 22700 Jaca, Spain;2. Zoology and Evolutionary Biology, Department of Biology, University of Konstanz, Universitatstrasse 10, 78467 Konstanz, Germany;3. Department of Functional Biology, University of Oviedo, C/Julián Clavería s/n, 33006 Oviedo, Spain;1. Chemistry College, Dalian University of Technology, Dalian 116024, China;2. High Density Electronics Center, Department of Electrical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA;1. Department of Printed Electronics Engineering, Sunchon National University, Chonnam 57922, Korea;2. Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Korea;1. Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Kralovopolska 135, CZ-61265 Brno, Czech Republic;2. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic;3. Charles University in Prague, Faculty of Science, Department of Analytical Chemistry, UNESCO Laboratory of Environmental Electrochemistry, Hlavova 8, CZ-12843 Prague 2, Czech Republic;4. Charles University in Prague, Faculty of Science, Department of Organic Chemistry, Hlavova 8, CZ-12843 Prague 2, Czech Republic;5. Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic;1. Forensic Pathology Department, Institute of Legal Medicine, Seville, Spain;2. Dental Sinai, Seville, Spain;3. Institute of Legal Medicine, Badajoz, Spain;4. Center of Research in Biomedical Sciences, Universidad Autónoma de Chile, Temuco, Chile;5. Universidad Científica del Sur, Lima, Peru;6. CIMA Research Group, Faculty of Dentistry, University of La Frontera, Temuco, Chile;7. Laboratory of Forensic Dentistry, Faculty of Dentistry, University of La Frontera, Temuco, Chile |
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| Abstract: | A new polypyrrole (PPY)/maghemite (γ-Fe2O3) hybrid was prepared by modification of the surface of maghemite nanoparticles using polymerization of pyrrole on the surface. Fourier Transform infrared (FTIR), X-ray diffraction and electron microscopy studies have proven that it was only a surface modification, keeping the core structure unchanged. Transmission electron micrographs have shown the presence of PPY on the intergrain surface between maghemite particles, leading to reduction of particle aggregation. The electrochemical lithium capacity has increased up to 270 mAh/g in the potential range between 1.3 and 4.3 V vs. Li at 8 mA/g. The modified samples showed an enhanced cyclability compared to the pristine one. |
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