Conductive Carbon Microfibers Derived from Wet-Spun Lignin/Nanocellulose Hydrogels

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Helsinki School of Economics
  • University of Turku
  • Western Michigan University

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.

Details

Original languageEnglish
Pages (from-to)6013-6022
Number of pages19
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number6
Publication statusPublished - 18 Mar 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Carbon fibers, Carbonization, Cellulose nanofibrils, Coagulation, Electrical conductivity, Lignin, Wet spinning, SUSPENSIONS, CONVERSION, RHEOLOGY, Wet spinning Coagulation, CELLULOSE NANOFIBRILS, CARBONIZATION, FIBERS, FILAMENTS, FUEL, NANOTUBES, PRECURSORS

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