One-step wet-spinning process of CB/CNT/MnO2 nanotubes hybrid flexible fibres as electrodes for wearable supercapacitors
By Garcia-Torres, Jose; Roberts, Alexander J.; Slade, Robert C. T.; Crean, Carol
Published in Electrochimica Acta
2019
Abstract
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.
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