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Layer-By-Layer Design of Organic-Carbon Composite Electrodes for Capacitive Charge Storage.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Layer-By-Layer Design of Organic-Carbon Composite Electrodes for Capacitive Charge Storage.
Author:	N'Diaye, Jeanne Marietou Andre.
Published:	Ann Arbor : ProQuest Dissertations & Theses, 2021
Description:	192 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-06, Section: B.
Notes:	Advisor: Lian, Keryn.
Contained By:	Dissertations Abstracts International83-06B.
Subject:	Engineering.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28769066
ISBN:	9798496562171

Layer-By-Layer Design of Organic-Carbon Composite Electrodes for Capacitive Charge Storage.
N'Diaye, Jeanne Marietou Andre.

Layer-By-Layer Design of Organic-Carbon Composite Electrodes for Capacitive Charge Storage. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 192 p.

Source: Dissertations Abstracts International, Volume: 83-06, Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2021.

This item must not be sold to any third party vendors.

Delivering clean and sustainable energy is currently a major challenge worldwide. Among the promising energy storage solutions are electrochemical capacitors (ECs), which have seen tremendous improvements recently, but suffer from their low energy densities and fabrication costs. A potential remedy to these issues is the development of electrodes that combine the two main charge storage mechanisms of ECs, namely electrical double-layer capacitance (EDLC) and pseudocapacitance. This combination has been successfully realized by depositing conducting polymers on carbon, which greatly increases the energy density of the resulting composites. The main shortcomings of these composites are their slower charge storage kinetics and instability, resulting from thick active layer. The aim of this thesis is to address the issues above, in the case of composite electrodes based on carbon nanotubes (CNT) modified with redox polyluminol (CpLum) and sulfonated porphyrin macrocycles (TPPS). This work is divided into three parts, the first part starts with a single layer approach to identify the advantages and shortcomings of the developed composites. Compared to bare CNT electrodes, the obtained CpLum-CNT and TPPS-CNT composites have enhanced capacitive charge storage abilities and good stability. The charge storage kinetics of the composite was studied to gauge the capacitive performance of said composites.In the second part of the thesis, the knowledge gained from the first part is leveraged to develop a TPPS-CpLum-CNT composite. This dual layer material exhibits enhanced capacitive charge and faster storage kinetics compared to the individual single layer-CNT.The last part of this work tackles the layer-by-layer (LbL) assembly of molybdovanadogermanic (GeMoV) polyoxometalates. The synergy between redox active CpLum and GeMoV along with the anchoring polycation on CNT give rise to several improvements, including improved capacitive behavior, faster storage kinetics, and a wider operating potential window. The fundamental aspects of the contributions above enabled the design and optimization of carbon-based composites via a feasible and scalable LbL assembly method through an in-depth understanding of the physico-chemical and electrochemical properties of the materials at hand. On top of obtaining higher energy and power densities for ECs, the approaches in this work can be extended to improve other electrochemical devices.

ISBN: 9798496562171Subjects--Topical Terms:

210888
Engineering.
Subjects--Index Terms:

Composite electrodes

Layer-By-Layer Design of Organic-Carbon Composite Electrodes for Capacitive Charge Storage.
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520 $a Delivering clean and sustainable energy is currently a major challenge worldwide. Among the promising energy storage solutions are electrochemical capacitors (ECs), which have seen tremendous improvements recently, but suffer from their low energy densities and fabrication costs. A potential remedy to these issues is the development of electrodes that combine the two main charge storage mechanisms of ECs, namely electrical double-layer capacitance (EDLC) and pseudocapacitance. This combination has been successfully realized by depositing conducting polymers on carbon, which greatly increases the energy density of the resulting composites. The main shortcomings of these composites are their slower charge storage kinetics and instability, resulting from thick active layer. The aim of this thesis is to address the issues above, in the case of composite electrodes based on carbon nanotubes (CNT) modified with redox polyluminol (CpLum) and sulfonated porphyrin macrocycles (TPPS). This work is divided into three parts, the first part starts with a single layer approach to identify the advantages and shortcomings of the developed composites. Compared to bare CNT electrodes, the obtained CpLum-CNT and TPPS-CNT composites have enhanced capacitive charge storage abilities and good stability. The charge storage kinetics of the composite was studied to gauge the capacitive performance of said composites.In the second part of the thesis, the knowledge gained from the first part is leveraged to develop a TPPS-CpLum-CNT composite. This dual layer material exhibits enhanced capacitive charge and faster storage kinetics compared to the individual single layer-CNT.The last part of this work tackles the layer-by-layer (LbL) assembly of molybdovanadogermanic (GeMoV) polyoxometalates. The synergy between redox active CpLum and GeMoV along with the anchoring polycation on CNT give rise to several improvements, including improved capacitive behavior, faster storage kinetics, and a wider operating potential window. The fundamental aspects of the contributions above enabled the design and optimization of carbon-based composites via a feasible and scalable LbL assembly method through an in-depth understanding of the physico-chemical and electrochemical properties of the materials at hand. On top of obtaining higher energy and power densities for ECs, the approaches in this work can be extended to improve other electrochemical devices.
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