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Published February 26, 2018 | Supplemental Material
Journal Article Open

Scalable Fabrication of Supercapacitors by Nozzle-free Electrospinning


Nozzle-free electrospinning was investigated as a facile technique for producing nanoscale materials for supercapacitors. MnO2 nanofibers and their composites with multiwalled carbon nanotubes (MWCNTs) were synthesized in a single step, using polyvinylpyrrolidone (PVP) and Mn(CH_3COO)_2·4H_2O as starting materials, followed up by heat treatment in ambient air. Nanofibers of relatively uniform diameter were produced at high rates. The nanofibers exhibited good electrical contact between MnO_2 and MWCNT without degradation, which was attributed to the improved stability of MWCNTs in PVP solutions. Electrochemical testing of the composites demonstrated a high capacitance of 1.43 F cm^(–2) at a scan rate of 100 mV s^(–1) in the three-electrode tests. Electrodes and devices produced by nozzle-free electrospinning are promising for practical energy storage applications.

Additional Information

© 2018 American Chemical Society. Received: December 5, 2017; Accepted: January 31, 2018; Published: January 31, 2018. We thank Miguel Gonzalez of Caltech for his assistance. Use of SAFCEL, Inc. equipment for electrochemical measurements is greatly appreciated. The electrospinning development work was funded by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under Award No. DE-AR0000495. The authors declare no competing financial interest.

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