Download or read book Study on Direct Synthesis of Energy Efficient Multifunctional Polyaniline Graphene Oxide Nanocomposite and Its Application in Aqueous Symmetric Supercapacitor Devices written by Hajera Gul and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of promising nanocomposite materials can always be tricky and depends a lot on the method of synthesis itself. Developing such synthesis routes, which are not only simple but also can effectively catch up the synergy of the compositing material, is definitely a worthy contribution towards nanomaterial science. Carbon-based materials, such as graphene oxide, and conjugative polymers, such as conductive polyaniline, are considered materials of the 21st century. This study involves a simple one pot synthesis route for obtaining a nanocomposite of polyaniline and graphene oxide with synergistic effects. The study was carried out in a systematic way by gradually changing the composition of the ingredients in the reaction bath until the formation of nanocomposite took place at some particular reaction parameters. These nanocomposites were then utilized for the fabrication of electrodes for aqueous symmetric supercapacitor devices utilizing gold or copper as current collectors. The device manifested a good capacitance value of 264 F/g at 1 A/g, magnificent rate performance, and capacitance retention of 84.09% at a high current density (10 A/g) when gold sheet electrodes were used as the current collectors. It also showed a capacitance retention of 79.83% and columbic efficiency of 99.83% after 2000 cycles.

Download or read book Electrode Materials for Energy Storage and Conversion written by Mesfin A. Kebede and published by CRC Press. This book was released on 2021-11-17 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the latest developments and materials used in electrochemical energy storage and conversion devices, including lithium-ion batteries, sodium-ion batteries, zinc-ion batteries, supercapacitors and conversion materials for solar and fuel cells. Chapters introduce the technologies behind each material, in addition to the fundamental principles of the devices, and their wider impact and contribution to the field. This book will be an ideal reference for researchers and individuals working in industries based on energy storage and conversion technologies across physics, chemistry and engineering. FEATURES Edited by established authorities, with chapter contributions from subject-area specialists Provides a comprehensive review of the field Up to date with the latest developments and research Editors Dr. Mesfin A. Kebede obtained his PhD in Metallurgical Engineering from Inha University, South Korea. He is now a principal research scientist at Energy Centre of Council for Scientific and Industrial Research (CSIR), South Africa. He was previously an assistant professor in the Department of Applied Physics and Materials Science at Hawassa University, Ethiopia. His extensive research experience covers the use of electrode materials for energy storage and energy conversion. Prof. Fabian I. Ezema is a professor at the University of Nigeria, Nsukka. He obtained his PhD in Physics and Astronomy from University of Nigeria, Nsukka. His research focuses on several areas of materials science with an emphasis on energy applications, specifically electrode materials for energy conversion and storage.

Download or read book Graphene based Composites for Electrochemical Energy Storage written by Jilei Liu and published by Springer. This book was released on 2017-01-07 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the synthesis and characterization of various carbon allotropes (e.g., graphene oxide/graphene, graphene foam (GF), GF/carbon nanotube (CNT) hybrids) and their composites for electrochemical energy storage applications. The coverage ranges from materials synthesis to electrochemical analysis, to state-of-the-art electrochemical energy storage devices, and demonstrates how electrochemical characterization techniques can be integrated and applied in the active materials selection and nanostructure design process. Readers will also discover the latest findings on graphene-based electrochemical energy storage devices including asymmetric supercapacitors, lithium ion batteries and flexible Ni/Fe batteries. Given the unique experimental procedures and methods, the systematic electrochemical analysis, and the creative flexible energy storage device design presented, the thesis offers a valuable reference guide for researchers and newcomers to the field of carbon-based electrochemical energy storage.

Download or read book Graphene based Nanotechnologies for Energy and Environmental Applications written by Mohammad Jawaid and published by Elsevier. This book was released on 2019-08-02 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene-Based Nanotechnologies for Energy and Environmental Applications explores how graphene-based materials are being used to make more efficient, reliable products and devices for energy storage and harvesting and environmental monitoring and purification. The book outlines the major sustainable, recyclable, and eco-friendly methods for using a range of graphene-based materials in innovative ways. It represents an important information source for materials scientists and engineers who want to learn more about the use of graphene-based nanomaterials to create the next generation of products and devices in energy and environmental science. Graphene-based nanotechnologies are at the heart of some of the most exciting developments in the fields of energy and environmental research. Graphene has exceptional properties, which are being used to create more effective products for electronic systems, environmental sensing devices, energy storage, electrode materials, fuel cell, novel nano-sorbents, membrane and photocatalytic degradation of environmental pollutants especially in the field of water and wastewater treatment. Covers synthesis, preparation and application of graphene based nanomaterials from different sources Demonstrates systematic approaches to the design, synthesis, characterization and applications of graphene-based nanocomposites in order to establish their important relationship with end-user applications Discusses the challenges in ensuring reliability and scalability of graphene-based nanotechnologies

Download or read book Graphene and Nanoparticles Hybrid Nanocomposites written by Abou el Kacem Qaiss and published by Springer Nature. This book was released on 2021-04-27 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the recent research on nanomaterials and nanotechnology based on the hybridization of graphene with other nanoparticles. With their simple synthesis, nanoscale dimensions, high aspect ratio, mechanical, electrical and thermal properties, graphene and its hybridized materials have witnessed a great interest, and the chapters in this book cover the spectrum of research from the preparation and synthesis of novel nanocomposites to their potential use in aeronautic, automative, energy and environmental applications. Written by respected researchers from both industry and academia, this book is of interest to researchers and students working on nanomaterials.

Download or read book Design of Graphene based Structures for Capacitive Energy Storage written by Zhuangnan Li and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Carbon and Metal Oxides Based Nanomaterials for Flexible High Performance Asymmetric Supercapacitors written by Yating Hu and published by Springer. This book was released on 2018-06-23 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis examines electrode materials such as mesoporous carbons, manganese oxides, iron oxides and their nanohybrids with graphene. It also explores several of the key scientific issues that act as the governing principles for future development of supercapacitors, which are a promising class of high-efficiency energy storage devices for tackling a key aspect of the energy crisis. However, critical technical issues, such as the low energy density and reliability, need to be addressed before they can be extended to a wide range of applications with much improved performance. Currently available material candidates for the electrodes all have their disadvantages, such as a low specific capacitance or poor conductivity for transition metal oxide/hydroxide-based materials. This thesis addresses these important issues, and develops a high-performance, flexible asymmetric supercapacitor with manganese oxides/reduced graphene oxide as the positive electrode and iron oxide/reduced graphene oxide as the anode, which delivers a high energy density of 0.056 Wh cm-3.

Download or read book Graphene to Polymer Graphene Nanocomposites written by Ayesha Kausar and published by Elsevier. This book was released on 2021-09-23 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene to Polymer/Graphene Nanocomposites: Emerging Research and Opportunities brings together the latest advances and cutting-edge methods in polymer/graphene nanocomposites that offer attractive properties and features, leading to a broad range of valuable applications. The initial chapters of this book explain preparation, properties, modification, and applications of graphene and graphene-based multifunctional polymeric nanocomposites. Later, the state-of-the-art potential of polymer/graphene nanocomposites for hierarchical nanofoams, graphene quantum dots, graphene nanoplatelets, graphene nanoribbons, etc., has been elucidated. The subsequent chapters focus on specific innovations and applications including stimuli-responsive graphene-based materials, anticorrosive coatings, applications in electronics and energy devices, gas separation and filtration membrane applications, aerospace applications, and biomedical applications. Throughout the book, challenges, and future opportunities in the field of polymer/graphene nanocomposites are discussed and analyzed. This is an important resource for researchers, scientists, and students/academics working with graphene and across the fields of polymer composites, nanomaterials, polymer science, chemistry, chemical engineering, biomedical engineering, materials science, and engineering, as well those in an industrial setting who are interested in graphene or innovative materials. Explores the fundamentals, preparation, properties, processing, and applications of graphene and multifunctional polymer-graphene nanocomposites. Focuses on the state of the art including topics such as nano-foam architectures, graphene quantum dots, graphene nanoplatelets, graphene nanoribbons, and other graphene nanostructures. Provides advanced applications including shape memory materials, anticorrosion materials, electronics and energy devices, gas separation and filtration membranes, aerospace relevance, and biomedical applications.

Download or read book Functionalized Graphene Nanocomposites and Their Derivatives written by Mohammad Jawaid and published by Elsevier. This book was released on 2018-11-01 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functionalized Graphene Nanocomposites and Their Derivatives: Synthesis, Processing and Applications explains how the functionalization technique is used to create graphene nanocomposites, also exploring its current uses in industrial applications. Graphene-based nanocomposites are one of the major advancements in polymer-based materials, thus the synthesis, nanoscale dimensions, high aspect ratio, mechanical, electrical and thermal properties of graphene and its derivative have all been major areas of research in the last decade. This important reference covers these updates and is a critical book for those working in the fields of materials processing and characterization. Explains how graphene is functionalized and used in the fabrication of nanocomposites for a range of applications Explores why the properties of functionalized graphene make it such a useful, versatile material Describes, in detail, the functionalization process for utilization in graphene

Download or read book Graphene Functionalization Strategies written by Anish Khan and published by Springer Nature. This book was released on 2019-10-17 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses various aspects of graphene fictionalization strategies from inorganic oxides and organic moieties including preparation, design, and characterization of functionalization material and its applications. Including illustrations and tables summarizing the latest research on manufacturing, design, characterization and applications of graphene functionalization, it describes graphene functionalization using different techniques and materials and highlights the latest technologies in the field of manufacturing and design. This book is a valuable reference resource for lecturers, students, researchers and industrialists working in the field of material science, especially polymer composites.

Download or read book Polyaniline and Graphene Based Symmetric and Asymmetric Solide State Supercapacitor written by Chang Liu and published by . This book was released on 2015 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The great demands of electronics is stimulated the development of portable energy storage devices. Supercapacitors show great potentials with its high power density and fast charge-discharge rate. Graphene material has advantages of high surface area, good electrical conductivity and is a promising material for fabrication of the electrical double layer capacitors. But the inevitable stacking between graphene sheets restricts the performance of the materials. Polyaniline (PANI) exhibits high intrinsic specific capacitance and good environmental stability, which is a promising candidate for pesudo capacitors. However, the shrinkage and swelling of PANI in charge-discharge process give the material mechnial degradation and less cycle stability. Here, we fabricate polyaniline/graphene composite electrode and get the synergistic effect of the electrochemical performance from the two materials. The specific capacitance is significantly improved and the energy density of devices is also enhanced. The improvement comes from the combination of two materials. Meanwhile the morphology of the PANI also plays an important role in device performance. The nano-arrays we got in this study is uniform nano-dot and nano-fiber. We investigated different synthesis environments influencing the morphology of PANI and got morphology of nano-dot and nano-fiber. The uniform nano-array of PANI alleviates the aggregation of graphene sheet and thus gives an increase of surface area and pathways of ion diffusion. Liquid electrolyte based supercapacitors has problem with high-cost package, electrolyte leakage, large-scale production and flexibility of device. However, with the solid-state supercapacitors fabrication we resolve this problem. In our study, we fabricate both symmetric and asymmetric solid-state supercapacitors configuration. The symmetric supercapacitors can reach specific capacitance as 639 F/g high and the stability of device is 70% retention after 10,000 charge-discharge cycles. Both of these characteristic is higher than that of graphene based devices. To improve the work voltage of supercapacitors, we develop asymmetric supercapacitors configuration with PANI/graphene composite as positive electrode and graphene as negative electrode. The asymmetric device configuration can reach work voltage two times higher as that of symmetric device and the energy density is also enhanced 46%. The tandem devices we made can enlighten the blue LED over seventy seconds.

Download or read book Multidimensional Polyaniline Reduced Graphene Oxide Silica Nanocomposite for Efficient Supercapacitor Electrodes written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nanocarbons for Advanced Energy Storage written by Xinliang Feng and published by John Wiley & Sons. This book was released on 2015-03-20 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first volume in the series on nanocarbons for advanced applications presents the latest achievements in the design, synthesis, characterization, and applications of these materials for electrochemical energy storage. The highly renowned series and volume editor, Xinliang Feng, has put together an internationally acclaimed expert team who covers nanocarbons such as carbon nanotubes, fullerenes, graphenes, and porous carbons. The first two parts focus on nanocarbon-based anode and cathode materials for lithium ion batteries, while the third part deals with carbon material-based supercapacitors with various applications in power electronics, automotive engineering and as energy storage elements in portable electric devices. This book will be indispensable for materials scientists, electrochemists, physical chemists, solid state physicists, and those working in the electrotechnical industry.

Download or read book Synthesis and Characterization of Reduced Graphene Oxide Polyaniline Au Nanoparticles Hybrid Material for Energy Applications written by Carmina Menchaca-Campos and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, synthesis and characterization of reduced graphene oxide/polyaniline/Au nanoparticles (GO/PANI/NpAu) as a hybrid capacitor are presented. Graphite oxide (GO) was synthesized by a modified Hummer's method. Polyaniline was synthesized by chemical polymerization, and Au nanoparticles (NpAu) were added afterward. Fabrication of the electrodes consisted on the hybrid materials being deposited on carbon cloth electrodes. The chemical and structural properties of the electrode were characterized by high-resolution scanning electron microscopy (HRSEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (X-R), and Raman spectroscopy; the results confirm the graphene reduction, the covalent functionalization, and formation of nanocomposites and also show the polyaniline grafted graphene. The performance and evaluation of the electrodes based on grapheme oxide (GO), polyaniline (PANI), GO-PANI, and GO/PANI/NpAu nanocomposites over carbon cloth, stainless steel, and copper have been obtained in 1 M H2SO4 solution, using electrochemical techniques namely: cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). They showed that GO/PANI/NpAu gave higher specific capacitance (SC) and energy values than PANI, and GO/PANI, in the order of 160 F/g. The present study introduces new hybrid material for energy applications, from the evaluation of their electrical contributions.

Download or read book Advanced Supercapacitor Based on Combination of Graphene Hybrid Materials and Redox Electrolytes written by Jee Youn Hwang and published by . This book was released on 2016 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrochemical capacitors, also known as supercapacitors, are attractive energy storage devices with the ability to recharge in seconds instead of hours for traditional batteries. They also can be used for up to a million charge/discharge cycles. Because of their enabling features, supercapacitors are replacing batteries and capacitors in an increasing number of applications including back-up power, cold starting, flash cameras, and regenerative braking. However, the low energy density of carbon electrodes is the main impediment to realizing the full potential of this technology. State-of-the-art supercapacitors feature activated carbon electrodes impregnated with a non-aqueous electrolyte (typically acetonitrile) that operate at voltages between 2.2-2.7 V. Unfortunately, activated carbons have low specific capacitance in organic electrolytes which severely limits the energy density of commercial systems. In addition, organic solvents are often flammable leading to safety and environmental concerns. Aqueous electrolytes, on the other hand, are safer, cheaper and have higher ionic conductivity, promising higher capacitance electrodes. This has triggered tremendous research efforts in order to develop new hybrid electrode materials that are capable of providing a huge amount of energy in an aqueous electrolyte. We have used a commercial grade LightScribe DVD burner for the direct synthesis and processing of graphene-metal oxide (RuO2, Fe3O4, MnO2, V2O5, etc.) hybrid electrodes in a single step. By anchoring metal oxide nanoparticles directly onto graphene, the 3-dimensional, highly porous graphene surfaces serve as excellent conductors for fast electron transfer, while metal oxide nanoparticles provide a large electrochemically active surface area for fast and reversible Faradaic reactions. Although metal oxide and carbon composite active materials are able to improve the capacitance, the energy density cannot be improved significantly if one only relies on the solid active materials comprising the electrode. Another important deciding factor for the performance of a supercapacitor is the electrolyte. Adding redox-additives into a traditional aqueous electrolyte has proven to be an efficient route to enhance supercapacitor performance because redox additives can contribute to the capacitance and enhance the energy densities via redox reactions between the electrode and the electrolyte. While carbon hybrid electrodes can only operate at 1.0 V, the addition of a redox mediator extends the decomposition voltage of the electrolyte, resulting in a symmetric supercapacitor with an ultrahigh voltage of 2 V. This represents a conceptual advance in the field of aqueous supercapacitors and may enable a new generation of eco-friendly energy storage devices. As both electrode and electrolyte contribute to charge storage simultaneously, an ultrahigh specific capacitance can be obtained. In addition, single-step direct laser writing of hybrid micro-supercapacitors shows great potential for miniaturized electronics. Thus, the current work provides an effective strategy for designing and fabricating aqueous supercapacitors and micro-supercapacitors that hold promise for a sustainable energy future.

Download or read book Synthesis of High performance Polyaniline graphene Oxide Nanocomposites written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Nanocomposite Supercapacitor Materials I written by Kamal K. Kar and published by Springer Nature. This book was released on 2020-04-16 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book delivers a comprehensive overview of the characteristics of several types of materials that are widely used in the current era of supercapacitors; namely, architectured carbon materials, transition metal oxides and conducting polymers. It provides readers with a complete introduction to the fundamentals of supercapacitors, including the development of new electrolytes and electrodes, while highlighting the advantages, challenges, applications and future of these materials. This book is part of the Handbook of Nanocomposite Supercapacitor Materials. Supercapacitors have emerged as promising devices for electrochemical energy storage, playing an important role in energy harvesting for meeting the current demands of increasing global energy consumption. The handbook covers the materials science and engineering of nanocomposite supercapacitors, ranging from their general characteristics and performance to materials selection, design and construction. Covering both fundamentals and recent developments, this handbook serves a readership encompassing students, professionals and researchers throughout academia and industry, particularly in the fields of materials chemistry, electrochemistry, and energy storage and conversion. It is ideal as a reference work and primary resource for any introductory senior-level undergraduate or beginning graduate course covering supercapacitors.