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Open AccessArticle

Oriented Graphenes from Plasma-Reformed Coconut Oil for Supercapacitor Electrodes

1
School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4000, Australia
2
QUT-CSIRO Joint Sustainable Processes and Devices Laboratories, Lindfield, NSW 2070, Australia
3
CSIRO Manufacturing, Lindfield, NSW 2070, Australia
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1679; https://doi.org/10.3390/nano9121679
Received: 4 November 2019 / Revised: 22 November 2019 / Accepted: 22 November 2019 / Published: 25 November 2019
The utilization of vertical graphene nanosheet (VGN) electrodes for energy storage in supercapacitors has long been desired yet remains challenging, mostly because of insufficient control of nanosheet stacking, density, surface functionality, and reactivity. Here, we report a single-step, scalable, and environment-friendly plasma-assisted process for the fabrication of densely packed yet accessible surfaces of forested VGNs (F-VGNs) using coconut oil as precursor. The morphology of F-VGNs could be controlled from a continuous thick structure to a hierarchical, cauliflower-like structure that was accessible by the electrolyte ions. The surface of individual F-VGNs was slightly oxygenated, while their interior remained oxygen-free. The fabricated thick (>10 μm) F-VGN electrodes presented specific capacitance up to 312 F/g at a voltage scan rate of 10 mV/s and 148 F/g at 500 mV/s with >99% retention after 1000 cycles. This versatile approach suggests realistic opportunities for further improvements, potentially leading to the integration of F-VGN electrodes in next-generation energy storage devices. View Full-Text
Keywords: plasma nanoscience; oriented graphenes; plasma production of nanomaterials plasma nanoscience; oriented graphenes; plasma production of nanomaterials
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Kumar, S.; Martin, P.; Bendavid, A.; Bell, J.; Ostrikov, K.K. Oriented Graphenes from Plasma-Reformed Coconut Oil for Supercapacitor Electrodes. Nanomaterials 2019, 9, 1679.

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