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Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical Capacitors
Although electrochemical capacitors (ECs), also known as supercapacitors or ultracapacitors, charge and discharge faster than batteries, they are still limited by low energy densities and slow rate capabilities. We used a standard LightScribe DVD optical drive to do the direct laser reduction of graphite oxide films to graphene. The produced films are mechanically robust, show high electrical conductivity (1738 Siemens per meter) and specific surface area (1520 square meters per gram), and can thus be used directly as EC electrodes without the need for binders or current collectors, as is the case for conventional ECs. Devices made with these electrodes exhibit ultrahigh energy density values in different electrolytes while maintaining the high power density and excellent cycle stability of ECs. Moreover, these ECs maintain excellent electrochemical attributes under high mechanical stress and thus hold promise for high-power, flexible electronics.
Journal Article
Carbons for Electrochemical Energy Storage and Conversion Systems
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 undoubtedly fills this need. Written in collaboration with prominent scientists in carbon science and its energy-related applications, Carbons for Electrochemical Energy Storage and Conversion Systems provides the most complete and up-to-date coverage available on carbon materials for application in electrochemical energy storage and conversion. The text studies different carbon materials and their detailed physicochemical properties and provides an in-depth review of their wide-ranging applications-including lithium-ion batteries, supercapacitors, fuel cells, and primary cells.
eBook
Overview of wireless power transfer technologies for electric vehicle battery charging
In this study, a comprehensive review of existing technological solutions for wireless power transfer used in electric vehicle battery chargers is given. The concept of each solution is thoroughly reviewed and the feasibility is evaluated considering the present limitations in power electronics technology, cost and consumer acceptance. In addition, the challenges and advantages of each technology are discussed. Finally, a thorough comparison is made and a proposed mixed conductive/wireless charging system solution is suggested to solve the inherent existing problems.
Journal Article
Technology and Applications of Wide Bandgap Semiconductor Materials: Current State and Future Trends
Silicon (Si)-based semiconductor devices have long dominated the power electronics industry and are used in almost every application involving power conversion. Examples of these include metal-oxide-semiconductor field-effect transistors (MOSFETs), insulated-gate bipolar transistors (IGBTs), gate turn-off (GTO), thyristors, and bipolar junction transistor (BJTs). However, for many applications, power device requirements such as higher blocking voltage capability, higher switching frequencies, lower switching losses, higher temperature withstand, higher power density in power converters, and enhanced efficiency and reliability have reached a stage where the present Si-based power devices cannot cope with the growing demand and would usually require large, costly cooling systems and output filters to meet the requirements of the application. Wide bandgap (WBG) power semiconductor materials such as silicon carbide (SiC), gallium nitride (GaN), and diamond (Dia) have recently emerged in the commercial market, with superior material properties that promise substantial performance improvements and are expected to gradually replace the traditional Si-based devices in various power electronics applications. WBG power devices can significantly improve the efficiency of power electronic converters by reducing losses and making power conversion devices smaller in size and weight. The aim of this paper is to highlight the technical and market potential of WBG semiconductors. A detailed short-term and long-term analysis is presented in terms of cost, energy impact, size, and efficiency improvement in various applications, including motor drives, automotive, data centers, aerospace, power systems, distributed energy systems, and consumer electronics. In addition, the paper highlights the benefits of WBG semiconductors in power conversion applications by considering the current and future market trends.
Journal Article
Power Electronics for Renewable Energy Systems, Transportation and Industrial Applications
<p><i>Power Electronics for Renewable Energy, Transportation, and Industrial Applications</i> combines state-of-the-art global expertise to present the latest research on power electronics and its application in transportation, renewable energy, and different industrial applications. This timely book aims to facilitate the implementation of cutting-edge techniques to design problems offering innovative solutions to the growing power demands in small- and large-size industries.  Application areas in the book range from smart homes and  electric and plug-in hybrid electrical vehicles (PHEVs), to smart distribution and intelligence operation centers where significant energy efficiency improvements can be achieved through the appropriate use and design of power electronics and energy storage devices. </p> <p>Key features: </p> <ul> <li>Discusses wide range of power electronics converters and control techniques to reduce energy waste and improve grid power quality.</li> <li>Brings together power electronics technologies such as renewable energy conversion, electric transportation, and electric drives, which are prevalent in industry and at education and research stages.</li> <li>Defines existing challenges, concerns, and selected problems complying with international trends, standards, and programs for electric power conversion, distribution, and sustainable energy development. </li> <li>An imperative and far reaching learning resource for power electronics engineers, researchers, and students.</li> </ul>
eBook