Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 128, Issue -, Pages 33-40Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2016.03.012
Keywords
Functional composites; Layered structure; Nanocomposites; Electrical properties
Categories
Funding
- Creative Research Initiative Program - National Research Foundation of Korea (NRF) [2015R1A3A2028975]
- NSL (National Space Lab) program through the National Research Foundation of Korea [NRF-2014M1A3A3A02034793]
- National Research Foundation of Korea [2014M1A3A3A02034793] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report a bendable and flexible supercapacitor based on polypyrrole-coated core-shell bacterial cellulose composite networks. As an initial step, gel-type bacterial cellulose was transformed into individually ultrathin bacterial cellulose nanofibers (TOBC) with diameters of 3-5 nm, by using 2,2,6,6-tetramethylpylperidine-l-oxyl radical (TEMPO)-mediated oxidation and successive mild disintegration in water. And, PPy-TOBC core-shell nanofiber network electrodes were synthesized in situ by oxidative polymerization of pyrrole with iron (III) chloride on the TOBC nanofibers in aqueous medium. The PPy-TOBC core-shell nanofiber network electrode exhibited a high porosity (101 m(2)/g) and high conductivity (similar to 6.63 S/cm) due to the homogenous coating of PPy nanoparticles on the TOBC nanofiber network. The as-prepared PPy-TOBC supercapacitor cell, fabricated with PVDF-EMIMBF4 (1-Ethyl-3-methylimidazolium tetrafluoroborate) polymer electrolyte, showed a specific capacitance of 153 F/g and energy density of 21.22 Wh/kg at the current density of 0.2 A/g. Moreover, the PPy-TOBC super-capacitor exhibited an exceptionally good cyclic stability with similar to 93% capacitance retention after 100 cycles; it also showed good bending stability due to the mechanical failure tolerance of the nanofiber-networked electrodes. The present approach is a versatile, inexpensive, and promising way to develop the cellulose-based nanofiber network electrodes for practical energy storage applications. (C) 2016 Elsevier Ltd. All rights reserved.
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