Download or read book Scissor g C3N4 for high density loading of catalyst domains in mesoporous thin layer conductive network for durable Li S batteries written by Chuanzhong Lai and published by OAE Publishing Inc.. This book was released on 2023-05-29 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of Li-S batteries (LSBs) is hindered by the undesired shuttle effect that leads to the fast consumption of active materials. The separator modification by using the carbon matrix with embedded metal nitride as catalyst can ease the problem. However, the previous synthesis processes of metal nitride catalysts are difficult to achieve a balance between their high-density production, homogenous distribution and excellent electronic contact with conductive substrates. Herein, we propose a bond scissoring strategy based on g-C3N4 to prepare NbN catalyst domains with high-density loading uniformly embedded in mesoporous thin-layer conductive carbon network (NbN/C) for durable LSBs. The molten salt reaction process is favorable for the diffusion of Nb cations into a porous g-C3N4 precursor to break the C-N bond and immobilize the N element. The residual monolithic carbon framework with space confinement effect limits the irregular growth and stacking of NbN precipitates. The NbN catalytic domains exhibit a strong adsorption effect on lithium polysulfides (LiPSs) and accelerate their liquid-solid conversion reactions. The LSBs utilizing an NbN/C-modified separator show superior cycling and rate performance, with a high-capacity retention of 72.7% after 1,000 cycles under 2 C and a high areal capacity of ~7.08 mA h cm-2 under a high sulfur loading of 6.6 mg cm-2. This g-C3N4-assisted strategy opens a new gate for the design of an integrated catalysis-conduction network for high-performance LSBs.
Download or read book Active sites rich zeolitic imidazolate framework MXene heterostructure modified separator with improved Li transport for high performance Li S batteries written by Leiping Liao and published by OAE Publishing Inc.. This book was released on 2024-03-22 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inevitable shuttling of lithium polysulfides (LiPSs) and poor redox kinetics restrict real-world applications of lithium-sulfur (Li-S) batteries, although they have been paid plentiful attention. Herein, a thin and multifunctional heterostructure (ZIF-L/MXene), consisting of leaf-like zeolitic imidazolate framework sheets (ZIF-L) and two-dimensional layered Ti3C2Tx MXene nanosheets, is developed for modification of polyolefin-based separators. A good combination of the merits of the ZIF-L and MXene can hinder the restacking of MXene nanosheets and achieve a large specific surface area, thus exposing plentiful active sites for adsorption and catalytic reaction of LiPSs. Taking these obviously synergistic effects, the ZIF-L/MXene heterostructure modified separators not only alleviate the shuttling of LiPSs but also promote their kinetics conversion. Furthermore, with an improved electrolyte affinity, the ZIF-L/MXene modified separators can accelerate the transport of Li+. Thus, the modified separator endows a Li-S cell with an admirable discharge capacity of 1371.7 mAh g-1 at 0.2 C and favorable cycling stability, with a slow capacity decay ratio of 0.075% per cycle during 500 cycles. Even under a sulfur loading of ~ 4.1 mg cm-2, the Li-S battery can achieve an excellent capacity of 990.6 mAh g-1 at 0.1 C and maintain an excellent cycling performance. The novel ZIF-L/MXene heterostructure modified separator in this work can provide an alternative strategy for designing thin and light separators for high-performance Li-S batteries, via the enhancement of redox kinetics and reduction of shuttling of the LiPSs.
Download or read book Nanostructured Materials for the Detection of CBRN written by Janez Bonča and published by Springer. This book was released on 2018-07-11 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes topics in nanophysics, nanotechnology, nanomaterials, sensors, biosensors, security systems, and CBRN agents detection. There have been many significant advances in the past two years and some entirely new directions of research are just opening up. Recent developments in nanotechnology and measurement techniques now allow experimental investigation of the physical properties of nanostructured materials. The book presents new methods for the detection of chemical, biological, radiological and nuclear (CBRN) agents using chemical and biochemical sensors. Identification, protection and decontamination are the main scientific and technological responses for the modern challenges of CBRN agents.
Download or read book Heterogeneous Photocatalysis written by M. Schiavello and published by . This book was released on 1997-10-09 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalysis is a reaction which is accelerated by light while a heterogeneous reaction consists of two phases ( a solid and a liquid for example). Heterogeneous Photocatalysis is a fast developing science which to date has not been fully detailed in a monograph. This title discusses the basic principles of heterogeneous photocatalysis and describes the bulk and surface properties of semiconductors. Applications of various types of photoreactions are described and the problems related to the modeling and design of photoreactors are covered.
Download or read book Technology in Forensic Science written by Deepak Rawtani and published by John Wiley & Sons. This book was released on 2020-11-02 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book "Technology in Forensic Science" provides an integrated approach by reviewing the usage of modern forensic tools as well as the methods for interpretation of the results. Starting with best practices on sample taking, the book then reviews analytical methods such as high-resolution microscopy and chromatography, biometric approaches, and advanced sensor technology as well as emerging technologies such as nanotechnology and taggant technology. It concludes with an outlook to emerging methods such as AI-based approaches to forensic investigations.
Download or read book The Exploration of Supramolecular Systems and Nanostructures by Photochemical Techniques written by Paola Ceroni and published by Springer Science & Business Media. This book was released on 2011-11-01 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Exploration of Supramolecular Systems and Nanostructures by Photochemical Techniques provides a comprehensive view of the most commonly used photochemical and photophysical techniques and their applications to the study of supramolecular systems. Optical inputs are extremely powerful in the study of nanostructures since they can be used both to “read” the state of the system and to provide it energy to work. After a brief introduction to the realm of photochemistry, electronically excited state formation and the different pathways of excited state deactivation, the book focuses on the theoretical basis and the practical aspects related to the most widely used photophysical and photochemical techniques, from absorption to time-resolved emission techniques with polarized light. Each chapter illustrates an example of the application of that particular technique to the study of a supramolecular system. The Exploration of Supramolecular Systems and Nanostructures by Photochemical Techniques not only discusses the latest advances of the field of supramolecular photochemistry but it also offers technical and operative details useful in the laboratory. It is therefore suitable for both the novice and the expert.
Download or read book Carbon Nanomaterial Based Adsorbents for Water Purification written by Suprakas Sinha Ray and published by Elsevier. This book was released on 2020-06-27 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deterioration of water quality and unavailability of drinkable water are pressing challenges worldwide. The removal of toxic organic and inorganic pollutants from water is vital for a clean environment, as a response to water scarcity. Adsorption-based water technologies are among the most widely used because of their high efficiency and low cost, without relying on a complex infrastructure. In recent years, carbon nanomaterials (CNMs), such as graphene and derivatives, carbon nanotubes, carbon nanofibers, nanoporous carbon, fullerenes, graphitic carbon nitride, and nanodiamonds have been extensively exploited as adsorbents due to their extraordinary surface properties, ease of modification, large surface area, controlled structural varieties, high chemical stability, porosity, low density, ease of regeneration, and reusability. This book provides a thorough overview of the state of the art in carbon nanomaterials as they are used for adsorption applications in water purifications, as well as addressing their toxicological challenges. This volume primarily explores the fundamentals of adsorption, its mechanical aspects, synthesis and properties of CNMs, and adsorption performances of CNMs and their nanocomposites with organic and inorganic materials. Structural engineering and activation processes produce materials with enhanced adsorptive properties and separation efficiencies. Furthermore, the formation of CNMs with 2D and 3D macro-and microstructures and high porosities is a potential approach to improve adsorption performances and extend CNM use at the industrial level. The book also addresses important issues regarding these adsorbents that potentially affect future research and industrial applications of carbon-based nanoadsorbents in water security. Presents advances in multifunctional 3D superstructures of carbon nanomaterials and their composites for adsorption applications Outlines the fundamentals on synthesis and characterization techniques of carbon-based nanostructures and their composites Assesses the major toxicological challenges in using nanostructured materials as adsorbents for water purification
Download or read book Semiconductor Photocatalysis written by Jiaguo Yu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research in Novel Materials written by Rafiqul Islam and published by Nova Science Publishers. This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most important first premise in science is that mass can be neither created nor destroyed. It is also becoming clear that natural laws dictate that mass be connected to energy. In effect, mass-balance provides the only governing equation that is both necessary and sufficient. Clearly, this compels a paradigm shift in scientific study. If a process is engineered in violation of natural principles of material production, the balance will be irreversibly disturbed, and the outcome of such a violated process both unpredictable and harmful to future generations. The post-Renaissance mode of technology development is based on an analogous corollary principle of mass production. This is an approach characterised by an excessive focus on quantity to the detriment of establishing or upholding definitive criteria as to quality. In order to make mass-produced materials acceptable to the consumer, non-scientific means have been used to cover up true properties of both materials and energy. As a result, today technologies ranging from photovoltaic electricity to genetically-modified crop production to mass-produced pharmaceutical products are considered to be in harmony with nature.On the other hand, herbal medicine is dismissed as quackery and direct solar energy usage as pseudo-science. Nobel Laureates, such as the prize-winning chemist Robert Curl, have not shied from pronouncing this development mode a technological disaster.
Download or read book Computational Photocatalysis written by Dmitri Kilin and published by . This book was released on 2021-02 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photochemical reactions and the underlying photophysical principles play key roles in the rational design of efficient systems for energy conversion and storage. This volume on interfaces contains fundamental theory, computational models, and applications for real materials. Edited by experts with a deep knowledge of the community, the volume will be useful to computational chemists, materials scientists, physical chemists, and especially those working in energy and nanomaterials.
Download or read book Hybrid Nanofluids written by Zafar Said and published by Elsevier. This book was released on 2022-01-28 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid Nanofluids: Preparation, Characterization and Applications presents the history of hybrid nanofluids, preparation techniques, thermoelectrical properties, rheological behaviors, optical properties, theoretical modeling and correlations, and the effect of all these factors on potential applications, such as solar energy, electronics cooling, heat exchangers, machining, and refrigeration. Future challenges and future work scope have also been included. The information from this book enables readers to discover novel techniques, resolve existing research limitations, and create novel hybrid nanofluids which can be implemented for heat transfer applications. Describes the characterization, thermophysical and electrical properties of nanofluids Assesses parameter selection and property measurement techniques for the calibration of thermal performance Provides information on theoretical models and correlations for predicting hybrid nanofluids properties from experimental properties
Download or read book Novel Carbon Materials and Composites written by Xin Jiang and published by John Wiley & Sons. This book was released on 2019-05-28 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Connects knowledge about synthesis, properties, and applications of novel carbon materials and carbon-based composites This book provides readers with new knowledge on the synthesis, properties, and applications of novel carbon materials and carbon-based composites, including thin films of silicon carbide, carbon nitrite, and their related composites. It examines the direct bottom-up synthesis of the carbon-based composite systems and their potential applications, and discusses the growth mechanism of the composite structures. It features applications that range from mechanical, electronic, chemical, biochemical, medical, and environmental to functional devices. Novel Carbon Materials and Composites: Synthesis, Properties and Applications covers an overview of the synthesis, properties, and applications of novel carbon materials and composites. Especially, it covers everything from chemical vapor deposition of silicon carbide films and their electrochemical applications to applications of various novel carbon materials for the construction of supercapacitors to chemical vapor deposition of diamond/silicon carbide composite films to the covering and fabrication processes of nanodot composites. Looks at the recent progress and achievements in the fields of novel carbon materials and composites, including thin films of silicon carbide, carbon nitrite, and their related composites Discusses the many applications of carbon materials and composites Focuses on the hot topic of the fabrication of carbon-based composite materials and their abilities to extend the potential applications of carbon materials Published as a title in the new Wiley book series Nanocarbon Chemistry and Interfaces. Novel Carbon Materials and Composites: Synthesis, Properties and Applications is an important book for academic researchers and industrial scientists working in the fabrication and application of carbon materials and carbon-based composite materials and related fields.
Download or read book Rare Earth and Transition Metal Doping of Semiconductor Materials written by Volkmar Dierolf and published by Woodhead Publishing. This book was released on 2016-01-23 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare Earth and Transition Metal Doping of Semiconductor Material explores traditional semiconductor devices that are based on control of the electron’s electric charge. This book looks at the semiconductor materials used for spintronics applications, in particular focusing on wide band-gap semiconductors doped with transition metals and rare earths. These materials are of particular commercial interest because their spin can be controlled at room temperature, a clear opposition to the most previous research on Gallium Arsenide, which allowed for control of spins at supercold temperatures. Part One of the book explains the theory of magnetism in semiconductors, while Part Two covers the growth of semiconductors for spintronics. Finally, Part Three looks at the characterization and properties of semiconductors for spintronics, with Part Four exploring the devices and the future direction of spintronics. Examines materials which are of commercial interest for producing smaller, faster, and more power-efficient computers and other devices Analyzes the theory behind magnetism in semiconductors and the growth of semiconductors for spintronics Details the properties of semiconductors for spintronics
Download or read book Persistent Toxic Substance Monitoring written by Xing-Jiu Huang and published by John Wiley & Sons. This book was released on 2018-08-20 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling the urgent need for a professional book that specifies the applications of nanoelectrochemistry for the monitoring of persistent toxic substances, this monograph clearly describes the design concept, construction strategies and practical applications of PTS sensing interfaces based on nanoelectrochemical methods. The comprehensive and systematic information not only provides readers with the fundamentals, but also inspires them to develop PTS monitoring sensors based on functional nanostructures and nanomaterials. Of interestto chemists, electrochemistry researchers, materials researchers, environmental scientists, and companies dealing with electrochemical treatment and environment.
Download or read book Synthesis and Applications of Inorganic Nanostructures written by Huaqiang Cao and published by John Wiley & Sons. This book was released on 2017-12-26 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: Authored by a leading figure in the field, this book systematically describes all the fundamental aspects and applications of inorganic nanostructures from zero to three dimensions. It not only discusses various synthesis technologies, but also covers the physical properties of inorganic nanostructures, such as optical, electric and magnetic properties, and practical applications such as energy storage (including Li-ion and Ni-MH batteries and supercapacitors), superhydrophobic and bio-applications, etc. The focus throughout is on the synthesis-structure-application relationships, including the growth mechanisms for the nanostrucutres. Concise yet comprehensive, this is indispensable reading for chemists and materials scientists.
Download or read book Indian Banking written by R Parameswaran and published by S. Chand Publishing. This book was released on 2001 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: INDIAN BANKING FOR STUDENTS OF B.COM/B.A & MANAGEMENT COURSES
Download or read book Synthesis of Inorganic Nanomaterials written by Sneha Mohan and published by Woodhead Publishing. This book was released on 2018-06-29 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthesis of Inorganic Nanomaterials: Advances and Key Technologies discusses the latest advancements in the synthesis of various types of nanomaterials. The book's main objective is to provide a comprehensive review regarding the latest advances in synthesis protocols that includes up-to-date data records on the synthesis of all kinds of inorganic nanostructures using various physical and chemical methods. The synthesis of all important nanomaterials, such as carbon nanostructures, Core-shell Quantum dots, Metal and metal oxide nanostructures, Nanoferrites, polymer nanostructures, nanofibers, and smart nanomaterials are discussed, making this a one-stop reference resource on research accomplishments in this area. Leading researchers from industry, academia, government and private research institutions across the globe have contributed to the book. Academics, researchers, scientists, engineers and students working in the field of polymer nanocomposites will benefit from its solutions for material problems. Provides an up-to-date data record on the synthesis of all kinds of organic and inorganic nanostructures using various physical and chemical methods Presents the latest advances in synthesis protocols Includes the latest techniques used in the physical and chemical characterization of nanomaterials Covers the characterization of all the important materials groups, such as carbon nanostructures, core-shell quantum dots, metal and metal oxide nanostructures, Nano ferrites, polymer nanostructures and nanofibers
