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From waste to wealth: From kraft lignin to free-standing supercapacitors
Queen Mary University of London, UK.
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
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2019 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 145, p. 470-480Article in journal (Refereed) Published
Abstract [en]

Pure eucalyptus Kraft lignin derived carbon fiber mats were produced based on a model workflow. It covers the preparation and characterization of the lignin precursor and the carbon materials and its testing in the final application (supercapacitor). Sequential solvent extraction was employed to produce a eucalyptus Kraft lignin precursor which could be electrospun into lignin fibers without any additives. The fiber formation from low molecular weight lignin is assigned to strong intermolecular interactions via hydrogen bonding and π-π-stacking between individual lignin macromolecules which gives rise to association complexes in the electrospinning solution. By stabilization in air, carbonization in N2 and an activation step in CO2, free-standing microporous carbon fiber mats could be produced. These fiber mats possess mainly basic oxygen functional groups which proved to be beneficial when tested as free-standing electrodes in symmetric supercapacitors. Consequently, the CO2-activated fiber mats showed a high specific gravimetric capacitance of 155 F/g at 0.1 A/g, excellent rate capability with 113 F/g at 250 A/g and good capacitance retention of 94% after 6000 cycles when tested in 6 M KOH electrolyte. Therefore, we conclude that lignin itself is a promising precursor to produce microporous, oxygen functionalized carbon fibers serving as free-standing electrodes in aqueous supercapacitors.

Place, publisher, year, edition, pages
2019. Vol. 145, p. 470-480
Keywords [en]
kraft lignin, supercapacitor, carbon fibre, eucalyptus
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-37675DOI: 10.1016/j.carbon.2019.01.035OAI: oai:DiVA.org:ri-37675DiVA, id: diva2:1283635
Available from: 2019-01-29 Created: 2019-01-29 Last updated: 2019-05-15Bibliographically approved

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