Carbon Nanotube-Based Composite Fibers for Supercapacitor Application
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University of Cincinnati / OhioLINK
2019
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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin15619968245803232021-08-03T07:11:33Z Carbon Nanotube-Based Composite Fibers for Supercapacitor Application Adusei, Paa Kwasi Materials Science Fiber Supercapacitors CNT Fiber composites Pseudocapacitors Graphene CNT hybrid fiber PANI-CNT Hybrid Fiber Oxygen Plasma Functionalization In the fast-growing field of energy storage devices, using Carbon Nanotubes (CNTs), as part of the electrode structures brings significant advantages due to the superior electrochemical performance of devices made from them. This has been ascribed to their high surface area, electrical conductivity, charge transport capability, mesoporosity, and electrolyte accessibility. Furthermore, CNT can be assembled into sheets, ribbons, and fibers amongst other types of assemblages, which made these nanotube form materials of interest in the field of wearable electronics. In this work, we have explored new design and fabrication of CNT based fiber supercapacitors (FSC) with increased energy and power densities and have investigated the approaches by which their electrochemical performances can be improved.Increasing the surface area and tuning of the pore sizes have been identified as some of the ways to enhance the electrochemical properties of supercapacitors. By employing a dry spinning process of Chemical Vapor Deposition (CVD) synthesized CNT arrays, we created CNT fibers, which can be used as electrodes for fiber-based supercapacitors. We successfully achieved enhanced surface area and alteration of pore width in our CNT fibers by employing an atmospheric pressure oxygen plasma functionalization process (OPFCNT). The presence of functional groups on the surface of the fibers is proved by X-Ray Photoelectron Spectroscopy (XPS) and Raman Spectroscopy, while the increase of their surface area is demonstrated by Brauner-Emmett-Teller (BET) measurements, UV-Vis Spectroscopy, and Randles Sevcik method. We housed active materials (polyaniline (PANI)) in our OPFCNTs. The CNT-PANI electrodes were produced by employing chemical oxidation polymerization of PANI on oxygen plasma functionalized CNT (OPFCNT) fibers. We also investigated the use of ionic liquid electrolytes in our fiber supercapacitor devices to improve the energy and power densities of the fabricated devices. Due to the larger operating voltage windows of the ionic liquid electrolyte as well as the pseudocapacitive nature of PANI, we were able to reach high gravimetric, areal and volumetric densities of the fiber supercapacitors. Another strategy employed in this thesis was to create and test a simple route for the synthesis of three-dimensional graphene (3D-G) - carbon nanotube (CNT) hybrid fibers via CVD. The obtained hybrid fiber was employed as a free-standing current collector in an electrochemical supercapacitor, thus avoiding any conductive additives or metals. These novel carbon nanostructures are characterized and used to create high energy density supercapacitors. 2019-10-01 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1561996824580323 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1561996824580323 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Materials Science Fiber Supercapacitors CNT Fiber composites Pseudocapacitors Graphene CNT hybrid fiber PANI-CNT Hybrid Fiber Oxygen Plasma Functionalization |
| spellingShingle |
Materials Science Fiber Supercapacitors CNT Fiber composites Pseudocapacitors Graphene CNT hybrid fiber PANI-CNT Hybrid Fiber Oxygen Plasma Functionalization Adusei, Paa Kwasi Carbon Nanotube-Based Composite Fibers for Supercapacitor Application |
| author |
Adusei, Paa Kwasi |
| author_facet |
Adusei, Paa Kwasi |
| author_sort |
Adusei, Paa Kwasi |
| title |
Carbon Nanotube-Based Composite Fibers for Supercapacitor Application |
| title_short |
Carbon Nanotube-Based Composite Fibers for Supercapacitor Application |
| title_full |
Carbon Nanotube-Based Composite Fibers for Supercapacitor Application |
| title_fullStr |
Carbon Nanotube-Based Composite Fibers for Supercapacitor Application |
| title_full_unstemmed |
Carbon Nanotube-Based Composite Fibers for Supercapacitor Application |
| title_sort |
carbon nanotube-based composite fibers for supercapacitor application |
| publisher |
University of Cincinnati / OhioLINK |
| publishDate |
2019 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1561996824580323 |
| work_keys_str_mv |
AT aduseipaakwasi carbonnanotubebasedcompositefibersforsupercapacitorapplication |
| _version_ |
1719455938277015552 |