Fibres made from different nanostructured carbons (carbon black (CB)), carbon nanotubes (CNT) and CB/CNT were successfully developed by wet-spinning. The variation of dispersion conditions (carbon nanomaterial concentration, dispersant/Carbon nanomaterial concentration ratio, CB/CNT concentration ratio, pH) resulted in different electrochemical performance for each type of fibres. Fibres with the best capacitance values (10 F g−1) and good cycling stability (89%) were obtained from fibres containing 10% carbon black and 90% carbon nanotubes. A solid-state supercapacitor was fabricated by assembling the CB/CNT fibres resulting in 9.2 F g−1 electrode capacitance. Incorporation of 0.2 wt% birnessite-type potassium manganese oxide nanotubes dramatically increased the capacitance of the fibres up to 246 F g−1 due to the high specific capacitance of birnessite phase and the tubular nature of the nanomaterial.
Bibliographical noteNOTICE: this is the author’s version of a work that was accepted for publication in Electrochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Electrochimica Acta, , (2019) DOI: 10.1016/j.electacta.2018.10.201
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- Birnessite MnO2 nanotubes
- Carbon nanomaterials
- Flexible fibre
- Solid-state supercapacitor