On the chemical nature of thermally reduced graphene oxide and its electrochemical Li intake capacity |
| |
| Affiliation: | 1. Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, MI 48859-0001, USA;2. Department of Physics, Central Michigan University, Mount Pleasant, MI 48859-0001, USA;3. Department of Chemistry, Central Michigan University, Mount Pleasant, MI 48859-0001, USA;1. Faculty of Engineering and Green Technology, UniversitiTunku Abdul Rahman, Kampar, Malaysia;2. Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Sungai Long, Malaysia;1. Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, P. O. Box 9004, Saudi Arabia;2. Physics Dept., Faculty of Science, King Khalid University, P. O. Box 9004, Abha, Saudi Arabia;3. Faculty of Materials Science and Ceramics, AGH – University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland;4. Physics Dept., Faculty of College of Arts & Sciences, King Khalid University, Muhail Asir, Saudi Arabia;5. Laboratoire Géoressources, Matériaux, Environnement et Changements Globaux, Faculty of Sciences of Sfax, University of Sfax, 3018 Sfax, Tunisia;1. Department of Immunology and Microbial Pathogenesis, Memorial Sloan-Kettering Cancer Center, New York, NY;;2. Cancer Program, Broad Institute of MIT and Harvard, Cambridge, MA;;3. Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA;;4. Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY;;5. Department of Human Pathology and Oncology, University of Siena, Siena, Italy; and;6. Department of Pathology, Northwestern University, Chicago, IL |
| |
| Abstract: | Graphene oxide (GO) presents a unique chemical complexity due to the number of defect sites and chemical groups introduced by the harsh oxidative treatment. In this work, we elucidate the chemical nature of GO and thermally-reduced GO at different temperatures. These materials were characterized by a variety of techniques such as FT-IR, Raman spectroscopy, TGA, SEM, XRD, XPS, TEM, surface area, and elemental analysis. Furthermore, galvanostatic experiments demonstrate that the electrochemical performance of reduced-GOs for Li intake is optimal when GO is reduced at a relatively mild temperature of 250 °C regardless of the chemical environment. Mildly reduced-GOs show a high first cycle specific capacity of over 2000 mAh/g (charge) and 1000 mAh/g (discharge), at a large current density of 500 mA/g. After 100 cycles, the reversible capacity remains stabilized at 500 mAh/g. Our characterization results combined with density functional theory calculations suggest that the presence of specific ketone groups at the edge sites rather than their gross morphology is responsible for the enhanced performance of the material as anode electrodes. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
