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

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Abstract

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 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.

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

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Publication details

The article was received on 19 Dec 2018, accepted on 29 Jan 2019 and first published on 29 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA12261J
Citation: J. Mater. Chem. A, 2019, Advance Article

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

    C. Wan, Y. Jiao, W. Bao, H. Gao, Y. Wu and J. Li, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA12261J

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