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Fe3O4 Nanoparticle-Embedded Cellulose Nanofibre/Graphite Carbon Hybrid Aerogels as Advanced Negative Electrode for Flexible Asymmetric Supercapacitors

Abstract

Fe3O4 is a negative material with great development potential, but it remains a challenge for Fe3O4-based negative electrodes to attain excellent electrochemical performance and stability simultaneously with good flexibility, which limit their practical applications in high-performance flexible asymmetric supercapacitors (ASCs). In this study, a simple and scalable bottom-up strategy is presented to prepare three-dimensional (3D) porous CNF/MWCNT/GO-hybrid aerogels (HAs) based on one-dimensional (1D) cellulose nanofibers (CNFs) and multiwalled carbon nanotubes (MWCNTs) and two-dimensional (2D) graphene oxide (GO). After in-situ embedding of Fe3O4 nanoparticles (~200nm) into the HAs substrate, a high-performance flexible CNF/MWCNT/reduced-GO (RGO)/Fe3O4 electrode with a large capacitance of 1193 mF/cm2 and excellentrate capability as well as high durability has been synthesized. Moreover, when using this CNF/MWCNT/RGO/Fe3O4 as negative electrode, the as-fabricated flexible ASC device exhibited a significant capacitance and energy density of 5.82 F/cm3 and 2.35 mWh/cm3, respectively. In addition, the flexible ASC device retained more than 94.7% of its initial capacitance after 5000 charge-discharge cycles. These results indicate the proposed strategy can provide new opportunities for researchers to rationally design and prepare flexible ASC negative materials with excellent capacitive properties, which will extend the application of such materials to the domain of portable and wearable electronics.

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Publication details

The article was received on 14 Jun 2018, accepted on 08 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA05678A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Fe3O4 Nanoparticle-Embedded Cellulose Nanofibre/Graphite Carbon Hybrid Aerogels as Advanced Negative Electrode for Flexible Asymmetric Supercapacitors

    L. Y. Xia, X. Li, X. Wu, L. Huang, L. Yu, Y. Qing, Y. Wu and X. Lu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05678A

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