University of Oulu

ACS Appl. Energy Mater. 2020, 3, 4, 3530–3540.

Green carbon nanofiber networks for advanced energy storage

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Author: Wei, Jiayuan1; Geng, Shiyu1; Pitkänen, Olli2;
Organizations: 1Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-97187 Luleå, Sweden
2Microelectronics Research Group, University of Oulu, FI-90570 Oulu, Finland
3Fibre and Particle Engineering Research Group, University of Oulu, FI-90570 Oulu, Finland
4Mechanical & Industrial Engineering (MIE), University of Toronto, Toronto, ON M5S 3G8, Canada
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5.6 MB)
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Language: English
Published: American Chemical Society, 2020
Publish Date: 2020-06-09


Energy storage devices such as supercapacitors of high performance are in great need due to the continuous expansion of digitalization and related devices for mobile electronics, autonomous sensors, and vehicles of different kinds. However, the nonrenewable resources and often complex preparation processes associated with electrode materials and structures pose limited scale-up in production and difficulties in versatile utilization of the devices. Here, free-standing and flexible carbon nanofiber networks derived from renewable and abundant bioresources are demonstrated. By a simple optimization of carbonization, the carbon nanofiber networks reach a large surface area of 1670 m² g–1 and excellent specific gravimetric capacitance of ∼240 F g–1, outperforming many other nanostructured carbon, activated carbon, and even those decorated with metal oxides. The remarkable electrochemical performance and flexibility of the green carbon networks enable an all-solid-state supercapacitor device, which displays a device capacitance of 60.4 F g–1 with a corresponding gravimetric energy density of 8.4 Wh kg–1 while maintaining good mechanical properties.

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Series: ACS applied energy materials
ISSN: 2574-0962
ISSN-E: 2574-0962
ISSN-L: 2574-0962
Volume: 3
Issue: 4
Pages: 3530 - 3540
DOI: 10.1021/acsaem.0c00065
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
216 Materials engineering
Funding: We are grateful for the financial support provided by the Swedish Research Council (Carbon Lignin 2017-04240), Swedish strategic research program Bio4Energy, Business Finland (project Grelectronics), and Interreg Nord & Lapinliitto (project Flexibla Transparenta Ledande Filmer som Electroder). We acknowledge the support received from the Micro- and Nanotechnology Center, University of Oulu.
Copyright information: © 2020 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium,provided the author and source are cited.