Electrochemical Characteristics of Porous Carbon Materials and Electrical Double Layer Capacitors PDF Download
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Author: Mati Arulepp
Publisher:
ISBN: 9789985568149
Category :
Languages : en
Pages : 195
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Book Description
Author: Mati Arulepp
Publisher:
ISBN: 9789985568149
Category :
Languages : en
Pages : 195
Get Book Here
Book Description
Author: Jin Hee Kang
Publisher:
ISBN:
Category :
Languages : en
Pages : 182
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Book Description
Porous electrode is a key component in electrochemical double layer capacitors (EDLCs), also called supercapacitors, which provides effective charge storage sites and ion transport channels along the electric double-layer interface between a solid electrode surface and liquid electrolyte. In particular, the micro-structure of an electrode is extremely important to optimize the ion's transport channel and subsequently increasing the ion storage capacity on porous electrodes. This research focuses on three types of porous carbon materials, activated carbon (AC), graphene and single-walled carbon nanotube (SWCNT), with varying surface area and internal porosity as electrode materials. Depending on the type of carbon materials, three different fabrication methods, cast-coating, electrophotretic deposition (EPD) and vacuum filtration deposition, were developed to exploit the unique properties of electrodes. Their structural, electrochemical, thermodynamic properties were characterized, and the temperature/frequency-dependent capacitive and resistive behaviors were correlated to the microstructures, BET surface area, pore size and pore size distribution (PSD) of the electrodes. Under various operating temperatures between -30 °C and 60 °C and frequency operations, these electrochemical parameters were quantified using cyclic voltammetry (CV), constant current charging/discharging (CCD) measurements and electrochemical impedance spectroscopy (EIS). The differences in their temperature/frequency-dependent characteristics, including their current response to high scan rates, capacitance retention, resistance variation, and degradation of energy and power densities, were addressed by investigating ion kinetics and transport into the micro-, or meso-pores of the electrodes. An equivalent circuit model for an EDLC device was proposed through analyzing the EIS measurements. This model was developed based on the Grahame theory, while the effects of charge diffusion and the ion adsorption at the double-layer interface and bulk media were investigated. This circuit model, upon its validation against the EIS data, was successfully applied to characterize practical EDLC devices. Experimental results were obtained from different EDLC cells consisting of activated carbon-based electrodes and two distinct electrolytes, aqueous (H2SO4) and organic (Et4NBF4/PC). The model predicted the useful parameters (such as charge transfer, diffusion, adsorption and bulk media impedance) which help interpret electrochemical processes at the electrode/electrolyte interface. The quantitative dependence of impedance on the applied electrode potential was analyzed for the two electrolytes during charging/discharging, and its correlation with the internal resistance (referred ESR) was derived. Their temperature-dependent electrochemical properties were also investigated using a specified characterization procedure, and the capacitance, internal resistance and energy/power densities of the two capacitors were quantified. The temperature dependency of their impedances was analyzed through simulations of the EIS data by the proposed equivalent circuit model. The simulated impedances were then utilized to address the performance discrepancies between the two electrolytes.
Author: Ana Arenillas
Publisher: Springer
ISBN: 9783030138998
Category :
Languages : en
Pages : 212
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Book Description
Author: Francois Beguin
Publisher: John Wiley & Sons
ISBN: 352764668X
Category : Technology & Engineering
Languages : en
Pages : 596
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Book Description
Supercapacitors are a relatively new energy storage system that provides higher energy density than dielectric capacitors and higher power density than batteries. They are particularly suited to applications that require energy pulses during short periods of time, e.g., seconds or tens of seconds. They are recommended for automobiles, tramways, buses, cranes, fork-lifts, wind turbines, electricity load leveling in stationary and transportation systems, etc. Despite the technological maturity of supercapacitors, there is a lack of comprehensive literature on the topic. Many high performance materials have been developed and new scientific concepts have been introduced. Taking into account the commercial interest in these systems and the new scientific and technological developments now is the ideal time to publish this book, capturing all this new knowledge. The book starts by giving an introduction to the general principles of electrochemistry, the properties of electrochemical capacitors, and electrochemical characterization techniques. Electrical double layer capacitors and pseudocapacitors are then discussed, followed by the various electrolyte systems. Modelling, manufacture of industrial capacitors, constraints, testing, and reliability as well as applications are also covered. 'Supercapacitors - Materials, Systems, and Applications' is part of the series on Materials for Sustainable Energy and Development edited by Prof. G.Q. Max Lu. The series covers advances in materials science and innovation for renewable energy, clean use of fossil energy, and greenhouse gas mitigation and associated environmental technologies.
Author: Inamuddin
Publisher: Materials Research Forum LLC
ISBN: 1945291575
Category : Technology & Engineering
Languages : en
Pages : 298
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Book Description
Electrochemical capacitors are most important for the development of future energy storage systems and sustainable power sources. New superior hybrid supercapacitors are based on binary and ternary thin film nanocomposites involving carbon, metal oxides and polymeric materials. The synthesis of materials and fabrication of electrodes for supercapacitor applications is discussed in detail. The book also presents the fundamental theory and a thorough literature review of supercapacitors. Energy Storage, Electrochemical Capacitors, Nanocomposites, Hybrid Supercapacitors, Carbon/Metal Oxide Composites, Metal Oxides/Hydroxides Composites, Polymer Type Capacitors, Nanoscience, Hydrothermal Synthesis, Graphene-based Composites, Ultrasonic Assisted Synthesis
Author: Francois Beguin
Publisher: CRC Press
ISBN: 1420055402
Category : Science
Languages : en
Pages : 532
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Book Description
As carbons are widely used in energy storage and conversion systems, there is a rapidly growing need for an updated book that describes their physical, chemical, and electrochemical properties. Edited by those responsible for initiating the most progressive conference on Carbon for Energy Storage and Environment Protection (CESEP), this book undoub
Author: Patrice Simon
Publisher: John Wiley & Sons
ISBN: 1119007348
Category : Science
Languages : en
Pages : 135
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Book Description
Electrochemical capacitors are electrochemical energy storage devices able to quickly deliver or store large quantities of energy. They have stimulated numerous innovations throughout the last 20 years and are now implemented in many fields. Supercapacitors Based on Carbon or Pseudocapacitive Materials provides the scientific basis for a better understanding of the characteristics and performance of electrochemical capacitors based on electrochemical double layer electrodes or pseudocapacitive materials, as well as providing information on the design and conception of new devices such as lithium-ion capacitors. This book details the various applications of supercapacitors, ranging from power electronics and stationary use, to transportation (hybrid vehicles, trams, planes, etc.). They are increasingly used in the automotive sector, especially as part of stop/start systems that have allowed for energy recovery through braking and reduced fuel consumption.
Author: Anatole France
Publisher: Library of Alexandria
ISBN: 1465604847
Category : Fiction
Languages : en
Pages : 142
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Book Description
The sea covers to-day what was once the Duchy of Clarides. No trace of the town or the castle remains. But when it is calm there can be seen, it is said, within the circumference of a mile, huge trunks of trees standing on the bottom of the sea. A spot on the banks, which now serves as a station for the customhouse officers, is still called "The Tailor's Booth," and it is quite probable that this name is in memory of a certain Master Jean who is mentioned in this story. The sea, which encroaches year by year, will soon cover this spot so curiously named. Such changes are in the nature of things. The mountains sink in the course of ages, and the depths of the seas, on the contrary, rise until their shells and corals are carried to the regions of clouds and ice. Nothing endures. The face of land and sea is for ever changing. Tradition alone preserves the memory of men and places across the ages and renders real to us what has long ceased to exist. In telling you of Clarides I wish to take you back to times that have long since vanished. Thus I begin: The Countess of Blanchelande having placed on her golden hair a little black hood embroidered with pearls.... But before proceeding I must beg very serious persons not to read this. It is not written for them. It is not written for grave people who despise trifles and who always require to be instructed. I only venture to offer this to those who like to be entertained, and whose minds are both young and gay. Only those who are amused by innocent pleasures will read this to the end. Of these I beg, should they have little children, that they will tell them about my Honey-Bee. I wish this story to please both boys and girls and yet I hardly dare to hope it will. It is too frivolous for them and, really, only suitable for old-fashioned children. I have a pretty little neighbour of nine whose library I examined the other day. I found many books on the microscope and the zoophytes, as well as several scientific story-books. One of these I opened at the following lines: "The cuttle-fish Sepia Officinalis is a cephalopodic mollusc whose body includes a spongy organ containing a chylaqueous fluid saturated with carbonate of lime." My pretty little neighbour finds this story very interesting. I beg of her, unless she wishes me to die of mortification, never to read the story of Honey-Bee.
Author: Mejdi Jeguirim
Publisher: Elsevier
ISBN: 0128148942
Category : Technology & Engineering
Languages : en
Pages : 506
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Book Description
Char and Carbon Materials Derived from Biomass: Production, Characterization and Applications provides an overview of biomass char production methods (pyrolysis, hydrothermal carbonization, etc.), along with the characterization techniques typically used (Scanning Electronic Microscopy, X-Ray Fluorescence, Nitrogen adsorption, etc.) In addition, the book includes a discussion of the various properties of biomass chars and their suitable recovery processes, concluding with a demonstration of applications. As biomass can be converted to energy, biofuels and bioproducts via thermochemical conversion processes, such as combustion, pyrolysis and gasification, this book is ideal for professionals in energy production and storage fields, as well as professionals in waste treatment, gas treatment, and more. Provides a discussion of sources of biomass feedstocks, such as agricultural, woody plants and food processing residue Discusses the various production processes of biomass chars, including pyrolysis and hydrothermal carbonization Explores various applications of biomass chars within different industries, including energy and agronomy
Author: Rajender Boddula
Publisher: John Wiley & Sons
ISBN: 3527346872
Category : Technology & Engineering
Languages : en
Pages : 356
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Book Description
Introduction to Electromagnetic Waves with Maxwell???s Equations Discover an innovative and fresh approach to teaching classical electromagnetics at a foundational level Introduction to Electromagnetic Waves with Maxwell???s Equations delivers an accessible and practical approach to teaching the well-known topics all electromagnetics instructors must include in their syllabus. Based on the author???s decades of experience teaching the subject, the book is carefully tuned to be relevant to an audience of engineering students who have already been exposed to the basic curricula of linear algebra and multivariate calculus. Forming the backbone of the book, Maxwell???s equations are developed step-by-step in consecutive chapters, while related electromagnetic phenomena are discussed simultaneously. The author presents accompanying mathematical tools alongside the material provided in the book to assist students with retention and comprehension. The book contains over 100 solved problems and examples with stepwise solutions offered alongside them. An accompanying website provides readers with additional problems and solutions. Readers will also benefit from the inclusion of: A thorough introduction to preliminary concepts in the field, including scalar and vector fields, cartesian coordinate systems, basic vector operations, orthogonal coordinate systems, and electrostatics, magnetostatics, and electromagnetics An exploration of Gauss??? Law, including integral forms, differential forms, and boundary conditions A discussion of Ampere???s Law, including integral and differential forms and Stoke???s Theorem An examination of Faraday???s Law, including integral and differential forms and the Lorentz Force Law Perfect for third- and fourth-year undergraduate students in electrical engineering, mechanical engineering, applied maths, physics, and computer science, Introduction to Electromagnetic Waves with Maxwell???s Equations will also earn a place in the libraries of graduate and postgraduate students in any STEM program with applications in electromagnetics.
