PhD thesis, University of Nottingham. Electrochemical capacitors, also known as supercapacitors, have attracted considerable attention over the past decades owing to their higher power density, long cycle life and moderate energy density compared. A high-performance supercapacitor integrates innovative electrode materials with desirable properties coupled with low cost and sustainability. In this thesis, a series of low cost transition metal oxide-activated carbon composite materials, lithium iron phosphate-activated carbon composite materials as well as metal oxide-graphene composite materials were prepared, characterized and evaluated as supercapacitor electrodes. The charge storage capabilities of these metal oxide-based composites with different loading ratios were evaluated in both mild aqueous 1 M Na2SO3 and 1 M Na2SO4 electrolytes.
ECE Circuit Analysis
With the ever-increasing need for portable and wearable electronics, flexible all-solid-state supercapacitors ASSSC have attracted wide attention and show promising application as power sources due to their fast charge-discharge rate, high power density, low cost, easy fabrication, and excellent customizability and versatility. Graphene possesses extraordinary physical properties including large specific surface area and high electronic conductivity and has been viewed as an ideal active electrode material for supercapacitors. Thus far, graphene-based flexible macroscopic assemblies, such as graphene-based films freestanding films or flexible substrate supported films and graphene-based fibers have been created and extensively researched as active electrodes for flexible ASSSC. The electrochemical performance of supercapacitors is greatly determined by the structures and physicochemical properties of the active electrode materials, and the mechanical strength of the flexible electrodes largely determines the electrochemical performance of the ASSSC under mechanical deformations including stretching, bending, rolling, and folding. As a final part, this contribution concludes with some challenges and prospects before graphene-based flexible ASSSC are really commercialized as power systems for wearable and portable electronics. If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center.
The electrochemical properties of this highly flexible, stable supercapacitor are enhanced by optimizing the concentration of the electrolyte in polymer gel. If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center. Go to our Instructions for using Copyright Clearance Center page for details. Authors contributing to RSC publications journal articles, books or book chapters do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material.
Cossutta, Matteo Life cycle analysis of graphene in a supercapacitor application. PhD thesis, University of Nottingham. The aim of this thesis is to undertake a life cycle analysis to identify the environmental impact of using graphene to manufacture supercapacitors. It was part of a larger project to develop supercapacitors using graphene in place of activated carbon. The first part of this work focuses on production of graphene in the laboratory.