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Capacitive effects of nitrogen doping on cellulose-derived carbon nanofibers

Artikel i vetenskaplig tidskrift
Författare Volodymyr Kuzmenko
Olga Naboka
Henrik Staaf
Mohammad Mazharul Haque
Gert Göransson
Per Lundgren
Paul Gatenholm
Peter Enoksson
Publicerad i Materials Chemistry and Physics
Volym 160
Sidor 59–65
ISSN 0254-0584
Publiceringsår 2015
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 59–65
Språk en
Länkar dx.doi.org/10.1016/j.matchemphys.20...
Ämnesord Nanostructures; Surfaces; Electrochemical properties
Ämneskategorier Materialkemi, Elektrokemi, Nanoteknik

Sammanfattning

Carbons with valuable electrochemical characteristics are among the most convenient electrode materials used for energy storage. At the moment, their production is mostly reliant on unsustainable fossil fuels. A preferential sustainable production of enhanced carbonaceous electrodes can be achieved with more extensive utilization of abundant renewable resources instead of fossils. In this study, nitrogen-doped carbon nanofibers (CNFs) were synthesized from cellulose, the most abundant renewable resource, via consecutive steps of cellulose acetate electrospinning, subsequent deacetylation to cellulose, impregnation with nitrogen-containing additive (ammonium chloride), and carbonization. Results of material characterization showed that the carbonization of functionalized cellulose samples led to formation of CNFs doped with 4–5.6 at.% of nitrogen. In comparison with pristine CNFs N-doped samples had a slightly lower specific surface area, but higher conductivity and hydrophilicity. Moreover, electrochemical measurements indicated that the enhanced N-doped materials had about 2.5 times higher specific capacitance which was increasing throughout 1000 charge–discharge cycles. These results suggest that nitrogen doping method used in this study has a positive pseudocapacitive effect on the electrochemical performance of carbonized cellulose materials.

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