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Hierarchical cellulose-derived CNF/CNT composites for electrostatic energy storage
Chalmers Tekniska Högskola.
Chalmers Tekniska Högskola.
Chalmers Tekniska Högskola.
Chalmers Tekniska Högskola.
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2016 (English)In: Journal of Micromechanics and Microengineering, ISSN 0960-1317, E-ISSN 1361-6439, Vol. 26, no 12, article id 124001Article in journal (Refereed) Published
Abstract [en]

Today many applications require new effective approaches in energy delivery on demand. Supercapacitors are viewed as essential energy storage devices that can continuously provide quick energy. The performance of supercapacitors is mostly determined by electrode materials that can store energy via electrostatic charge accumulation. This study presents new sustainable cellulose-derived composite electrodes which consist of carbon nanofibrous (CNF) mats covered with vapor-grown carbon nanotubes (CNTs). The CNF/CNT electrodes have high electrical conductivity and surface area: two most important features that are responsible for good electrochemical performance of supercapacitor electrodes. The results show that the composite electrodes have fairly high values of specific capacitance, energy and power density and can retain excellent performance over at least 2 000 cycles. All of that makes us think that sustainable cellulose-derived composites can be extensively used in future as supercapacitor electrodes.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2016. Vol. 26, no 12, article id 124001
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-45613DOI: 10.1088/0960-1317/26/12/124001ISI: 000389022900002OAI: oai:DiVA.org:kau-45613DiVA, id: diva2:957226
Available from: 2016-09-01 Created: 2016-09-01 Last updated: 2021-10-29Bibliographically approved
In thesis
1. The influence of crystallinity on the properties of carbon nanotubes
Open this publication in new window or tab >>The influence of crystallinity on the properties of carbon nanotubes
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Carbon nanotubes have been advertised as a material with quite extraordinary properties, both mechanically and electrically. The truth is that carbon nanotubes is not one material, but several different. Depending on the method used to produce them, and consequently the quality of the atomic structure within their walls, their physical properties can also differ drastically. 

In this doctoral thesis a method was developed for quantifying the degree of order within the tubes' walls, namely their crystallinity, by using transmission electron microscopy. The method enables the characterization of the inherent properties of the tubes such as electrical conductivity and bending stiffness, alongside the determination of crystallinity, making it possible to quantify the influence of tube crystallinity on these critical properties. Furthermore, a model for electrical conduction in the outermost wall of multi-walled carbon nanotubes is suggested, enabling the determination of intrinsic quantities like the sheet resistance of individual crystallite grains within the walls and the boundaries in-between them. 

The studies reveal a profound shift in both mechanical and electrical behavior at a critical crystallite size, with large differences connected to production method, and even between individual tubes from the same production batch. These findings successfully explain previously seen differences and highlight the need for well-defined characterization techniques with protocols and classification systems, in order to successfully exploit the promising properties of carbon nanotubes in the future.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2021. p. 82
Series
Karlstad University Studies, ISSN 1403-8099 ; 2021:30
Keywords
carbon nanotubes, crystallinity, electrical conductivity, transmission electron microscopy
National Category
Physical Sciences Condensed Matter Physics
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-86394 (URN)978-91-7867-235-6 (ISBN)978-91-7867-246-2 (ISBN)
Public defence
2021-12-17, 21A 342 Eva Eriksson, Karlstads universitet, Karlstad, 13:15 (English)
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Supervisors
Available from: 2021-11-26 Created: 2021-10-29 Last updated: 2021-11-26Bibliographically approved

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Flygare, MattiasSvensson, Krister

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