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Conductive Carbon Microfibers Derived from Wet-Spun Lignin/Nanocellulose Hydrogels
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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19
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ACS Sustainable Chemistry & Engineering, Volume 7, issue 6, pp. 6013-6022
Abstract
We introduce an eco-friendly process to dramatically simplify carbon microfiber fabrication from biobased materials. The microfibers are first produced by wet-spinning in aqueous calcium chloride solution, which provides rapid coagulation of the hydrogel precursors comprising wood-derived lignin and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCNF). The thermomechanical performance of the obtained lignin/TOCNF filaments is investigated as a function of cellulose nanofibril orientation (wide angle X-ray scattering (WAXS)), morphology (scanning electron microscopy (SEM)), and density. Following direct carbonization of the filaments at 900 °C, carbon microfibers (CMFs) are obtained with remarkably high yield, up to 41%, at lignin loadings of 70 wt % in the precursor microfibers (compared to 23% yield for those produced in the absence of lignin). Without any thermal stabilization or graphitization steps, the morphology, strength, and flexibility of the CMFs are retained to a large degree compared to those of the respective precursors. The electrical conductivity of the CMFs reach values as high as 103 S cm -1 , making them suitable for microelectrodes, fiber-shaped supercapacitors, and wearable electronics. Overall, the cellulose nanofibrils act as structural elements for fast, inexpensive, and environmentally sound wet-spinning while lignin endows CMFs with high carbon yield and electrical conductivity.
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| openaire: EC/H2020/788489/EU//BioELCell
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Wang, L, Ago, M, Borghei, M, Ishaq, A, Papageorgiou, A C, Lundahl, M & Rojas, O J 2019, 'Conductive Carbon Microfibers Derived from Wet-Spun Lignin/Nanocellulose Hydrogels', ACS Sustainable Chemistry & Engineering, vol. 7, no. 6, pp. 6013-6022. https://doi.org/10.1021/acssuschemeng.8b06081