期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 16, 页码 9556-9564出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta12261j
关键词
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资金
- National Natural Science Foundation of China [31530009, 31470584]
- Youth Scientific Research Foundation, Central South University of Forestry and Technology [QJ2018002A]
- Fundamental Research Funds for the Central Universities [2572018AB09]
To build high-energy density asymmetric supercapacitors (ASCs), current studies are always directed towards cathode materials; however, anode materials are paid much less attention. Here we for the first time demonstrate that orthorhombic FeOCl with a self-stacked laminated structure is suitable to be a high-performance anode material for supercapacitors since its unique laminated structure can provide abundant active sites for migration and intercalation reactions of electrolyte ions. By introducing a highly conductive and porous cellulose-derived carbon aerogel (CDCA) matrix, the mechanical stability and charge-storage kinetics of FeOCl are significantly enhanced. FeOCl@CDCA delivers an ultra-high areal specific capacitance of 1618 mF cm(-2) (647 F g(-1)) at 2 mA cm(-2) and outstanding cycle stability with no more than 10% capacitance loss after 10 000 cycles in 1 M Na2SO4 between 1 and 0 V vs. Ag/AgCl. An ASC operating at 0-1.8 V was fabricated using a FeOCl@CDCA anode and a cheap MnO2 cathode. The ASC displays a highly competitive energy/power density (289 mW h cm(-2) at 1.8 mW cm(-2)) and excellent rate capability and cycle stability. These findings may open a new pathway to design high-energy density energy-storage systems using FeOCl-based anodes.
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