期刊
CARBON
卷 50, 期 9, 页码 3298-3309出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2011.12.022
关键词
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资金
- Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
- National Science Foundation Research Experience for Teachers (RET) [EEC-0743111]
- Alexander von Humboldt Foundation
- NSF [0924570]
- John von Neumann-Institut fur Computing (NIC)
- Forschungszentrum Julich GmbH, Germany [HLZ18, HLZ16]
- Julich Supercomputing Centre (JSC)
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0924570] Funding Source: National Science Foundation
Onion-like carbon (OLC), also known as carbon onions, is an attractive material for electrical energy storage in regards to high rate, high power applications. We report the most up to date, systematic, and extensive study of the electrochemical behavior of carbon onions in aqueous (1 M sulfuric acid, H2SO4) and organic (1 M tetraethylammonium tetrafluoroborate, TEA-BF4, and 1 M tetrabutylammonium tetrafluoroborate, TBA-BF4, in acetonitrile) electrolytes. The physical and electrical properties of OLC are studied as a function of the synthesis temperature and compared with diamond soot, carbon black, and activated carbon. To obtain a molecular scale picture of the processes at the OLC-electrolyte interface, we supplement the experimental work with molecular dynamics (MD) simulations of carbon onions in organic electrolytes. The capacitive performance of OLC exceeds other carbon materials at high charge/discharge rates (up to 50 V s(-1); time constant tau similar to 10 ms). OLC produced from detonation soot has a performance similar to that of OLC from highly purified nanodiamond. While OLC produced at 1500 degrees C has the largest specific surface area, OLC produced at 1800 degrees C has the highest conductivity and shows the best capacitive performance at high rates. (C) 2011 Elsevier Ltd. All rights reserved.
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