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Development Of Nanostructure Photocatalysts Based Perovskite And Carbon Nitride Materials For Co2 Reduction And H2 Production Using Solar Energy
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Book Synopsis Development of nanostructure photocatalysts based perovskite and carbon nitride materials for CO2 reduction and H2 production using solar energy by : Nhu-Nang Vu
Download or read book Development of nanostructure photocatalysts based perovskite and carbon nitride materials for CO2 reduction and H2 production using solar energy written by Nhu-Nang Vu and published by . This book was released on 2020 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse passe en revue la production de carburant à partir d’énergie solaire de H2O et de CO2 à l'aide d'un photocatalyseur, ce qui est considéré comme l'une des solutions les plus prometteuses pour la lutte contre le réchauffement climatique et la crise du carburant. Cette thèse propose quatre nouvelles approches pour développer des photocatalyseurs nanostructures efficaces pour la réduction photocatalytique du CO2 et la production de H2. L’absorption de la lumière, la séparation des charges et les réactions de surface sont des aspects critiques qui ont un impact énorme sur la photoréduction du CO2 et la production photocatalytique de H2. Le g-C3N4 et les matériaux pérovskites sont des candidats appropriés pour ces processus, car ils offrent des caractéristiques structurelles et des propriétés exceptionnelles. Un grand nombre de photocatalyseurs nanostructures sont actuellement développés pour la photoréduction du CO2 et la production photocatalytique de H2. Les nanostructures 2D et les nanocomposites hétérostructures sont largement étudiés en raison de leurs excellentes propriétés telles que la séparation efficace et la longue durée de vie des porteurs de charge. De manière prometteuse, les nanostructures 2D et les nanocomposites des matériaux g-C3N4 et pérovskites présentent d'excellentes performances photocatalytiques, selon la littérature scientifique. Des nanofeuilles de pérovskite HCa2Ta3O10 réduites et des nanocomposites à hétérostructures g-C3N4/CdS sont des photocatalyseurs développés pour la photoréduction du CO2 sous la lumière du soleil. Les nanofeuilles de pérovskite HCa2Ta3O10 réduites sont préparées à partir de la pérovskite en couches CsCa2Ta3O10 par une méthode d'échange d'ions simple couplée à un traitement sous H2. Elles présentent une surface très élevée et une meilleure absorption de la lumière solaire. Leur large bande interdite est considérablement rétrécie par une introduction considérable de Ta+4 et de lacunes d'oxygène. En tant que support des nanoparticules de Pt et CuO, les nanofeuilles réduites présentent une activité photocatalytique de réduction du CO2 améliorée avec formation principale d'éthanol. Le nanocomposite g-C3N4/CdS hétérostructure est synthétisé par une méthode avancée développée par notre groupe en utilisant les gazes NH3 et H2S sous une haute pression créée in situ. Elle fracture la structure du C3N4, créant des nanoparticules CdS (NP) à la surface de iv la structure C3N4 modifiée. Le nanocomposite synthétisé comporte un C3N4 poreux lié aux nanoparticules CdS via le pont C-S-Cd. La structure est particulière avec la présence de nanoparticules de CdS qui favorise une photoréduction améliorée du CO2 sous la lumière du soleil avec une sélectivité élevée de production de CO. Les nanofeuilles et nanofragments de g-C3N4 sont synthétisés par de nouvelles approches en tant que photocatalyseurs pour la production de H2. Le complexe supramoléculaire de mélamine et d’acide cyanurique (MCS) avec une structure lamellaire condensée est synthétisé pour la première fois dans un autoclave à haute pression en tant que précurseur riche en N. La structure particulière du complexe MCS permet la formation directe de nanofeuilles g-C3N4 avec une surface spécifique élevée et une absorption de lumière significativement améliorée dans la région visible par le processus de traitement thermique à basse température. Les nanofeuilles telles que préparées peuvent générer un taux de production de H2 élevé en utilisant le spectre lumineux étendu à 550 nm avec une efficacité quantique élevée de 3,5%. Il est intéressant de noter que la préparation du complexe MCS induit une haute pression de NH3 et H2O, qui peut fracturer sélectivement la structure de C3N4 pour former des nanofragments avec une cristallinité élevée et des groupes fonctionnels abondants (-OH et -NH2). Les nanofragments préparés présentent des caractéristiques supérieures telles que la séparation et le transfert rapides des charges avec un excellent entraînement de charge, un niveau de bande de conduction élevé et une meilleure adsorption et activation des protons. Ils présentent une production photocatalytique exceptionnelle de H2 sous la lumière du soleil, avec un rendement quantique de 12,3% à 420 nm.
Book Synopsis Multifunctional Photocatalytic Materials for Energy by : Zhiqun Lin
Download or read book Multifunctional Photocatalytic Materials for Energy written by Zhiqun Lin and published by Woodhead Publishing. This book was released on 2018-03-19 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multifunctional Photocatalytic Materials for Energy discusses recent developments in multifunctional photocatalytic materials, such as semiconductors, quantum dots, carbon nanotubes and graphene, with an emphasis on their novel properties and synthesis strategies and discussions of their fundamental principles and applicational achievements in energy fields, for example, hydrogen generation from water splitting, CO2 reduction to hydrocarbon fuels, degradation of organic pollutions and solar cells. This book serves as a valuable reference book for researchers, but is also an instructive text for undergraduate and postgraduate students who want to learn about multifunctional photocatalytic materials to stimulate their interests in designing and creating advanced materials. Covers all aspects of recent developments in multifunctional photocatalytic materials Provides fundamental understanding of the structure, properties and energy applications of these materials Contains contributions from leading international experts in the field working in multidisciplinary subject areas Focuses on advanced applications and future research advancements, such as graphene-based nanomaterials and multi-hybrid nanocomposites Presents a valuable reference for researchers and students that stimulates interest in designing advanced materials for renewable energy resources
Book Synopsis Nanostructured Photocatalysts by : Rabah Boukherroub
Download or read book Nanostructured Photocatalysts written by Rabah Boukherroub and published by Elsevier. This book was released on 2020-06-06 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured Photocatalysts: From Materials to Applications in Solar Fuels and Environmental Remediation addresses the different properties of nanomaterials-based heterogeneous photocatalysis. Heterogeneous nanostructured photocatalysis represents an interesting and viable technique to address issues of climate change and global energy supply. Sustainable hydrogen (H2) fuel production from water via semiconductor photocatalysis, driven by solar energy, is regarded as a viable and sustainable solution to address increasing energy and environmental issues. Similarly, photocatalytic reduction of CO2 with water for the production of hydrocarbons could also be a viable solution. Sections cover band gap tuning, high surface area, the short diffusion path of carriers, and more. Introduces the utilization of nanostructured materials in heterogeneous photocatalysis for hydrogen fuel production via water splitting Explains preparation techniques for different nanomaterials and hybrid nanocomposites, enabling improved sunlight absorption efficiency and enhanced charge separation Assesses the challenges that need to be addressed before this technology can be practically implemented, particularly of identifying cost-effective nanophotocatalysts
Book Synopsis Nanostructured Photocatalysts by : Van-Huy Nguyen
Download or read book Nanostructured Photocatalysts written by Van-Huy Nguyen and published by Elsevier. This book was released on 2021-06-25 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured Photocatalysts: From Fundamental to Practical Applications offers a good opportunity for academic, industrial researchers and engineers to gain insights on the fundamental principles and updated knowledge on the engineering aspects and various practical applications of photocatalysis. This book comprehensively and systematically reviews photocatalytic fundamental aspects, ranging from reaction mechanism, kinetic modeling, nanocatalyst synthesis and design, essential material characterization using advanced techniques, and novel reactor design and scale-up. Future perspectives, techno-economical evaluation and lifecycle assessment of photocatalytic processes are also provided. Finally, a wide range of practical, important and emerging photocatalytic applications, namely wastewater treatment, air pollution remediation, renewable and green energy generation, and vital chemical production are thoroughly covered, making this book useful and beneficial for engineers, scientists, academic researchers, undergraduates and postgraduates. Provides a fundamental understanding of photocatalysis Covers all aspects of recent developments in photocatalytic processes and photocatalytic materials Focuses on advanced photocatalytic applications and future research advancements on energy, environment, biomedical, and other specialty fields Contains contributions from leading international experts in photocatalysis Presents a valuable reference for academic and industrial researchers, scientists and engineers
Book Synopsis Design and Development of Nanostructured Photocatalysts for CO2 Reduction Under Ambient Conditions by : Duc Trung Nguyen
Download or read book Design and Development of Nanostructured Photocatalysts for CO2 Reduction Under Ambient Conditions written by Duc Trung Nguyen and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The solar-light driven photocatalysis is considered a promising solution to both energy-shortage and environmental issues. In photocatalysis, a semiconductor-based photocatalyst is key to efficient CO2 reduction. Among others, graphitic carbon nitride and quantum dots materials are the most investigated because of their easy synthesis, low cost, and outstanding physicochemical properties. Numerous g-C3N4 and quantum dots - based nanostructured photocatalysts have been developed and studied for photocatalytic CO2 reduction. However, their photocatalytic performance is still moderate due to the rapid charge recombination and insufficient solar-light absorption. This thesis employed facile and new strategies to develop three efficient photocatalysts for CO2 reduction. The synthesized materials exhibit unique structural properties with improved solar-light absorption and increased charge separation rate, thus contributing to photocatalytic efficiency. For the g-C3N4 materials, we first employed cobalt cluster embedded graphitic carbon nitride as a cocatalyst for CO2 reduction by copolymerization between urea and cobalt complex as g-C3N4 and cobalt cluster precursors, respectively. Using 4,4'-Diamino-2,2'-bipyridine as a coordinating ligand of the cobalt complex is beneficial. First, it can copolymerize with urea during the thermolysis for the g-C3N4 formation, thus improving solar-light absorption of g-C3N4. Secondly, it can stabilize the cobalt cluster and provide and efficient electron transfer pathway between g-C3N4 and the cobalt cluster, resulting in enhanced photocatalytic performance. In the second material, we attempted to improve the solar-light absorption of g-C3N4 by incorporating TiN plasmonic nanoparticles onto the surface of g-C3N4 nanosheets. Before the incorporation, the surface of plasmonic TiN nanoparticles is grafted with amino groups to enhance the interaction with urea during the thermal copolymerization process. The synthesized material exhibited enhanced solar-light absorption and improved charge separation. As a result, this photocatalyst demonstrated high performance for photocatalytic CO2 reduction under solar-light irradiation. Regarding quantum dots material, we attempted to explore the relationship between the localized protons near the active sites and the photocatalytic performance by employing 3- mercaptopropionate as a proton shutter on CdS quantum dot surfaces. A facile aqueous synthesis was utilized to synthesize the water-soluble 3-mercaptopropionic acid (MPA)- capped CdS quantum dots. It was found that the enhanced photocatalytic activity of functional CdS quantum dots could be attributed to the cooperative interaction between localized protons and surface Cd atoms, which behave as a result of the Lewis acid and Lewis base interaction, respectively.
Book Synopsis Heterostructured Photocatalysts for Solar Energy Conversion by : Srabanti Ghosh
Download or read book Heterostructured Photocatalysts for Solar Energy Conversion written by Srabanti Ghosh and published by Elsevier. This book was released on 2020-10-10 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterostructured Photocatalysts for Solar Energy Conversion provides a comprehensive description of novel z-scheme hybrid materials based on metal oxide or chalcogenides-based semiconductor, or carbon-based nanomaterials (conducting polymers, graphene, and other carbon materials). The book explores energy conversion applications, such as hydrogen generation, water splitting, CO2 reduction or degradation of organic pollutants, and their associated new material and technology development. The book addresses a variety of topics, such as photochemical processes, materials and fabrication, degradation mechanisms, as well as challenges and strategies. The book includes in-depth discussions ranging from comprehensive understanding, to engineering of materials and applied devices. The concept of visible light active catalysis emerged in recent decades and continues to attract the scientific community. Driven primarily by an opportunity to develop novel multifunctional materials on one hand, and sustainable technologies on the other, several successful approaches have been explored. However, preparation, characterization, and application of visible light active Z-scheme heterojunction-based catalytic nanostructures are still at the foreground of research activity. Provides an overview on recently developed Z-scheme photocatalysts to stress their performance as catalysts Covers most of the important topics in photocatalysis Explores the most recent advances in synthesis to enable deeper understanding of the principles underlying electronic behavior of catalytic nanostructures, mechanistic details, and the evaluation of their effectiveness, as well as perspectives in solar light harvesting Serves as a valuable resource for better understanding of the current state of photocatalysis research and its possible applications in energy domain
Author :Kamel Abdelmoniem Mohamed Eid Publisher :Royal Society of Chemistry ISBN 13 :1839164611 Total Pages :342 pages Book Rating :4.8/5 (391 download)
Book Synopsis Carbon Nitride Nanostructures for Sustainable Energy Production and Environmental Remediation by : Kamel Abdelmoniem Mohamed Eid
Download or read book Carbon Nitride Nanostructures for Sustainable Energy Production and Environmental Remediation written by Kamel Abdelmoniem Mohamed Eid and published by Royal Society of Chemistry. This book was released on 2021-06-28 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beneficial properties of graphitic carbon nitride (gCN) have been discovered in recent years during the promotion of its visible‐light‐driven photocatalytic activity for water splitting. Applications of gCN have flourished in such fields as renewable energy production and environmental remediation, while gCNs have been explored to serve as electrocatalysts, electronic and photoelectronic devices, non-volatile memory devices, anodes in lithium‐ion batteries, and platinum supports in polymer electrolyte fuel cells. This book covers recent advances in the rational design and characterization of gCN nanostructures for energy and environmental remediation, and discusses achievements in fabrication approaches of gCN nanostructures using various chemical and physical approaches. It highlights recent advances in the theoretical and experimental development of novel multidimensional nanoarchitectonics of gCNs along with insight into catalytic energy production, energy storage, and environmental remediation. Practical applications and utilization of gCN based devices are also discussed. With contributions from leading global researchers, this title will appeal to graduate students and researchers in nanoscience, chemistry, chemical engineering and materials science who are interested in developing new gCN materials or devices.
Book Synopsis Nanostructured Photocatalysts by : Jurex Cuenca Gallo
Download or read book Nanostructured Photocatalysts written by Jurex Cuenca Gallo and published by Arcler Press. This book was released on 2018-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various books are available on photocatalysis systems based on bulk semiconducting materials. However, photocatalytic phenomena controlled by nanostructures are attractive beyond conventional semiconductors. This book is specifically devoted to the several novel uses of innovative organic, inorganic, and Metal-Organic Frameworks (MOFs)-based photocatalysts. Detailed discussion of synthesis methods, characterization techniques, and applications of advanced nanostructured photocatalysts is presented in the book. The conversion and storage of solar light is currently one of the most blooming interdisciplinary arenas of scientific technology converging various fields such as optics, physical chemistry, solid state physics, electrochemistry, photochemistry, catalysis, and several other research fields. The current textbook is intended to provide an outlook on the contemporary condition of photochemical systems for harvesting of solar light based on nanocrystalline semiconducting assemblies and materials. Different chapters of the book present an account on numerous aspects of such systems which include solar water splitting, photosynthetic procedures for reduction of CO2, evolution of molecular H2 and the photoelectrochemical organic substances based on nanoparticle semiconducting materials. A special attention is given to "nano" aspect of semiconducting photocatalytic materials, that is, the role of nanostructured crystals and the effect of their sizes in the conversion of solar energy, the design of semiconducting nanostructures with customized photochemical features, and the prospects of nanophotocatalysis systems based on heterogeneous photocatalytic materials. This book will inspire the researchers and readers to explore the novel design strategies for development of photocatalysts with customized nanostructures. Book jacket.
Book Synopsis Nanostructured, Functional, and Flexible Materials for Energy Conversion and Storage Systems by : Alagarsamy Pandikumar
Download or read book Nanostructured, Functional, and Flexible Materials for Energy Conversion and Storage Systems written by Alagarsamy Pandikumar and published by Elsevier. This book was released on 2020-05-27 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured, Functional, and Flexible Materials for Energy Conversion and Storage Systems gathers and reviews developments within the field of nanostructured functional materials towards energy conversion and storage. Contributions from leading research groups involved in interdisciplinary research in the fields of chemistry, physics and materials science and engineering are presented. Chapters dealing with the development of nanostructured materials for energy conversion processes, including oxygen reduction, methanol oxidation, oxygen evolution, hydrogen evolution, formic acid oxidation and solar cells are discussed. The work concludes with a look at the application of nanostructured functional materials in energy storage system, such as supercapacitors and batteries. With its distinguished international team of expert contributors, this book will be an indispensable tool for anyone involved in the field of energy conversion and storage, including materials engineers, scientists and academics. Covers the importance of energy conversion and storage systems and the application of nanostructured functional materials toward energy-relevant catalytic processes Discusses the basic principles involved in energy conversion and storage systems Presents the role of nanostructured functional materials in the current scenario of energy-related research and development
Book Synopsis New Insights in Photocatalysis for Environmental Applications by : Muhammad Bilal Tahir
Download or read book New Insights in Photocatalysis for Environmental Applications written by Muhammad Bilal Tahir and published by Springer Nature. This book was released on 2022-04-21 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explains the basic and fundamental aspects of nanotechnology and the potential use of nanostructured photocatalysts in various applications, especially in the context of the environment and energy harvesting. It describes the preparation and characterization of unique nanostructured photocatalysts and provides details of their catalytic action, and also discusses the design of new types of photocatalysts with controlled nanostructures. Given its broad scope, the book will appeal to academic and industrial researchers interested in heterogeneous photocatalysis, sustainable chemistry, energy conversion and storage, nanotechnology, chemical engineering, environmental protection, optoelectronics, sensors and surface and interface science.
Book Synopsis Pyrochlore Oxides by : Diana G. Fukina
Download or read book Pyrochlore Oxides written by Diana G. Fukina and published by Springer Nature. This book was released on 2023-12-20 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an in-depth exploration of complex metal oxides, focusing on their applications in photocatalysis and biomedical materials. It highlights the practical importance of complex metal oxides, which have gained significant attention in recent years due to their diverse range of properties. The book specifically delves into the most representative series of compounds based on stable structural types of minerals, such as perovskite, fluorite, pyrochlore, corundum, and rutile. It also emphasizes the scientific interest in the pyrochlore mineral structure, which has been shown to exhibit photocatalytic activity. Recent studies have revealed that some compounds with the pyrochlore structure can act as promising candidates for photocatalysis. Additionally, the book highlights the use of photocatalysis in producing biomedical materials based on natural polymers. These materials possess a unique combination of components assembled in a specific structure, which makes them highly attractive for regenerative medicine associated with cell/tissue regeneration stimulation. Overall, this book offers a comprehensive analysis of the potential of complex metal oxides, particularly those with the pyrochlore structure, and is particularly useful for those researchers working in the fields of green chemistry and biomedical materials science.
Book Synopsis Photocatalytic Perovskite Materials by : Tariq Altalhi
Download or read book Photocatalytic Perovskite Materials written by Tariq Altalhi and published by Elsevier. This book was released on 2025-04-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalytic Perovskite Materials: Green Sustainable Process for Chemical and Environmental Engineering and Science (GSPCEES) contains up-to-date information on hot topics concerning perovskite-based photocatalysts. The book gives readers an in-depth glance at photocatalysis via perovskite semiconductors and their applications in a diverse range of industries. The book provides an overview of the historical development of conventional catalysis and (perovskite) photocatalysis, its challenges, strategies for improvement as well as methods for synthesis and selectivity enhancement. It deals with photocatalytic behaviour of inorganic halide perovskites, organic-inorganic hybrid perovskite photocatalysts, organic-organic composite perovskite for photocatalysis, metal halide perovskite quantum dots, perovskite-based oxynitrides for photocatalysis, visible light active perovskites based photocatalysts, surface modification of perovskite materials to improve photocatalytic activity, and charge separation in perovskite nanostructures. The book also provides applications for solar hydrogen production, solar-driven fuel generation, volatile organic compounds, CO2 reduction, environmental remediation, degrading organic pollutants from wastewater, and organic reactions.
Book Synopsis Novel strategies to design and construct efficient semiconductor-based photocatalyst for enhancing photocatalytic hydrogen evolution and nitrogen fixation under sunlight irradiation by : Manh Hiep Vu
Download or read book Novel strategies to design and construct efficient semiconductor-based photocatalyst for enhancing photocatalytic hydrogen evolution and nitrogen fixation under sunlight irradiation written by Manh Hiep Vu and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Résumé en anglais
Book Synopsis Conversion of Water and CO2 to Fuels using Solar Energy by : Oomman K. Varghese
Download or read book Conversion of Water and CO2 to Fuels using Solar Energy written by Oomman K. Varghese and published by John Wiley & Sons. This book was released on 2024-02-28 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conversion of Water and CO2 to Fuels usingSolar Energy Comprehensive Resource for Understanding the Emerging Solar Technologies for Hydrogen Generation via Water Splitting and Carbon-based Fuel Production via CO2 Recycling Fossil fuel burning is the primary source of carbon in the atmosphere. The realization that such burning can harm the life on our planet, has led to a surge in research activities that focus on the development of alternative strategies for energy conversion. Fuel generation using solar energy is one of the most promising approaches that has received widespread attention. The fuels produced using sunlight are commonly referred to as “solar fuels.” This book provides researchers interested in solar fuel generation a comprehensive understanding of the emerging solar technologies for hydrogen generation via water splitting and carbon-based fuel production via CO2 recycling. The book presents the fundamental science, technologies, techno-economic analysis, and most importantly, the materials that are being explored to establish artificial methods of fuel production using solar energy. For the rapid advancement of the field, it is necessary for researchers, particularly for those who are new to the field, to have clear knowledge of various materials studied so far and their performance. For this reason, almost half of the book is dedicated to the discussions on materials and properties. Key topics discussed in the book include: Photocatalytic/photoelectrochemical processes that use semiconductor photocatalysts, including both ceramic and non-ceramic materials Photovoltaic assisted electrochemical processes Solar thermochemical processes Molecular photosynthesis Researchers and professionals in the fields of energy and materials and closely related science and engineering disciplines could use this book to aquire clear insights on both mainstream solar fuel technologies and those in the developmental stages.
Book Synopsis Perovskite Materials for Energy and Environmental Applications by : Khursheed Ahmad
Download or read book Perovskite Materials for Energy and Environmental Applications written by Khursheed Ahmad and published by John Wiley & Sons. This book was released on 2022-06-15 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: PEROVSKITE MATERIALS FOR ENERGY AND ENVIRONMENTAL APPLICATIONS The book provides a state-of-the-art summary and discussion about the recent progress in the development and engineering of perovskite solar cells materials along with the future directions it might take. Among all 3rd generation solar cells, perovskite solar cells have recently been attracting much attention and have also emerged as a hot research area of competing materials for silicon PV due to their easy fabrication, long charge-carrier lifetime, low binding energy, low defect density, and low cost. This book focuses primarily on the perovskite structures and utilizes them in modern technologies of photovoltaics and environmental applications. It will be unique in terms of the use of perovskite structures in solar cell applications. This book also discusses the type of perovskites, their synthetic approach, and environmental and solar cell applications. The book also covers how perovskite solar cells originated and the recent advances in perovskite solar cells. The reader will find in this book a lucid account that: Introduces the history of perovskite materials. Explores perovskite materials for energy conversion and environmental-related applications. Covers perovskite light absorber materials for the fabrication of high-performance perovskite solar cells. Describes the device architectures and physics of perovskite solar cells. Discusses the role of perovskite absorber, electron transport, and hole transport materials layers. Audience The book is essential reading for all those in the photovoltaic community, including materials scientists, surface physicists, surface chemists, solid-state physicists, solid-state chemists, and electrical engineers.
Book Synopsis Green Photocatalytic Semiconductors by : Seema Garg
Download or read book Green Photocatalytic Semiconductors written by Seema Garg and published by Springer Nature. This book was released on 2021-09-20 with total page 855 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises a detailed overview on the role of photocatalysts for environmental remediation, hydrogen production and carbon dioxide reduction. Effective ways to enhance the photocatalytic activity of the material via doping, hybrid material, laser light and nanocomposites have been discussed in this book. The book also further elaborates the role of metal nanoparticles, rare earth doping, sensitizers, surface oxygen vacancy, interface engineering and band gap engineering for enhancing the photocatalytic activity. An approach to recover the photocatalytic material via immobilization is also presented. This book brings to light much of the recent research in the development of such semiconductor photocatalytic systems. The book will thus be of relevance to researchers in the field of: material science, environmental science & technology, photocatalytic applications, newer methods of energy generation & conversion and industrial applications.
Book Synopsis Photochemical Charge Transfer in Nanostructured Photocatalysts for Solar Hydrogen Production by : Jiarui Wang
Download or read book Photochemical Charge Transfer in Nanostructured Photocatalysts for Solar Hydrogen Production written by Jiarui Wang and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar energy is a promising sustainable energy source to reduce greenhouse gas emission from combustion of fossil fuels and slow down the global climate change. Solar hydrogen generation via photocatalytic water splitting is potentially the most cost-effective way to produce solar fuels, so the development of efficient photocatalysts is one of the most important targets for scientific research. However, the application of inorganic materials for solar water splitting is currently limited by our understanding of photochemical charge transfer on the nanoscale, where space charge layers are less effective for carrier separation. Therefore, this dissertation focuses on the preparation of well-defined photocatalysts for the water splitting reaction and on the characterization of photochemical charge transfer on their interfaces. This will be accomplished through the application of surface photovoltage and photoelectrochemical measurements, and with photocatalytic reactivity tests. Results from this study can guide the design of inorganic photocatalysts with improved efficiency for solar energy conversion into fuel. Chapter 2 describes surface photovoltage spectroscopy studies to measure the internal photovoltages in a hydrogen evolution photocatalyst, single crystalline platinum/ruthenium-modified Rh-doped SrTiO3 nanocrystals. Voltages of -0.88 V and -1.13 V are found between the light absorber and the Ru and Pt cocatalysts, respectively, and a voltage of -1.48 V for a Rh-doped SrTiO3 film on an Au substrate. The voltages shows that the Pt and Ru cocatalysts not only improve the redox kinetics but also aid charge separation in the absorber. The voltages with redox agents correlate well with the photocatalytic performance of the catalyst and are influenced by the built-in potentials of the donor-acceptor configurations, the physical separation of donors and acceptors, and the reversibility of the redox reaction. The photovoltage data also allow the identification of a photosynthetic system for hydrogen evolution (80 [mu]mol·g−11h−1) under visible light illumination (>400 nm) from 0.05 M aqueous K4[Fe(CN)6]. Chapter 3 shows that suspended p-Si nanowires obtained by etching of an Al-doped silicon wafer facilitate photochemical hydrogen evolution under visible light. The activity varies greatly between sacrificial donors and can be increased by attachment of MoS2 cocatalysts, which promote proton reduction and charge transfer at the silicon-MoS2 interface. Overall, the activity of suspended p-Si nanorods is limited by the stability of the material in neutral solutions. A basic or neutral environment with photo-excitation can lead to silicon corrosion. In 0.05 M ferrocyanide at pH 6.5, the hydrogen evolution rate for SiNW/MoS2 was as high as 106 [mu]mol (10mg)−1 h−1 accompanied by silicon corrosion. The rate without corrosion decreased to 0.64 [mu]mol (10mg)−1 h−1 at a lower pH of 4.7. With silicon corrosion, the rate also reached 117 [mu]mol (10mg)−1 h−1 in pH 6.5 0.05 M Na2SO3 solution and 678 [mu]mol (10mg)−1 h−1 in 0.1 M NaSH without pH control. Silicon corrosion was not found in formaldehyde and methanol solutions, but the rates of SiNW/MoS2 and SiNW were as low as 0.40 and 0.18 [mu]mol (10mg)−1 h−1 for methanol solution, and 0.71 and 0.27 [mu]mol (10mg)−1 h−1 for formaldehyde solution. The increased hydrogen evolution with silicon corrosion can be attributed to both electron donating of silicon and reduced charge transfer resistivity with the dissolution of surface oxide layer on silicon nanowires. These findings can improve the understanding of photochemistry of Si-MoS2 catalyst, and help avoiding silicon corrosion in photocatalysis.
