Self-stacked multilayer FeOCl supported on a cellulose-derived carbon aerogel: a new and high-performance anode material for supercapacitors

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...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (16), p.9556-9564
Main Authors: Wan, Caichao, Jiao, Yue, Bao, Wenhui, Gao, He, Wu, Yiqiang, Li, Jian
Format: Article
Language:English
Subjects:
Aerogels
Anodes
Capacitance
Carbon
Cathodes
Cellulose
Density
Electrode materials
Energy storage
Flux density
Kinetics
Lithium
Manganese dioxide
Migration
Multilayers
Reaction kinetics
Shelf life
Silver chloride
Sodium sulfate
Stability
Storage systems
Supercapacitors
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Summary: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 Na 2 SO 4 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 MnO 2 cathode. The ASC displays a highly competitive energy/power density (289 μW 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.
ISSN:2050-7488
2050-7496
DOI:10.1039/C8TA12261J