Download or read book Changes in the microstructure of thin film silver catalysis under reactive conditions written by Geoffrey Laurence Price and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theses and Dissertations Accepted for Higher Degrees written by University of London and published by . This book was released on 1970 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Subjects of Dissertations Theses and Published Works Presented by Successful Candidates at Examinations for Higher Degrees written by University of London and published by . This book was released on 1967 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to Theses Accepted for Higher Degrees in the Universities of Great Britain and Ireland written by and published by . This book was released on 1970 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to Theses Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 1973 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Degradation of Catalytic Thin Films Revealed Using Transmission Electron Microscopy written by Yunzhi Liu and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As we face an urgent need to combat climate change and achieve a long-term goal of "carbon neutral" in the modern world, hydrogen as a renewable clean energy source has become an essential solution for energy storage and conversion. A major challenge in a future hydrogen economy is to find economical ways of storing, producing, and using hydrogen at a massive scale. Although much research effort has been devoted to finding acid-stable and active nanoscale catalysts for the production and consumption of hydrogen, such as in the oxygen evolution reaction (OER) of water splitting and oxygen reduction reaction (ORR) of fuel cells, it has been shown challenging owing to the high applied voltage and corrosive environment during electrochemical testing. In order to develop catalysts with good activity and long-term stability, it is important to understand the relationship between performance and materials properties as well as their degradation behavior in testing conditions. These goals can be achieved by applying transmission electron microscopy (TEM) with additional advanced functions, which characterizes the changes in structure and chemistry at atomic and nano scales. For reproducible electrochemical characterization, thin films of the materials of interest are deposited onto substrates and subsequently characterized by TEM methods in cross-section. With conventional cross-section TEM specimen preparation methods, this dissertation describes the degradation of catalytic thin films using high-resolution TEM (HR-TEM) imaging while maintaining the nature of the surface catalyst. The power of HR-TEM for this sort of study is firstly demonstrated by the characterization of an iridium oxide thin film for an OER catalyst. The film, deposited on yttria-stabilized zirconia (YSZ) substrate, was confirmed to be a mixture of predominately (100)-oriented orthorhombic columbite structure and co-stabilized tetragonal rutile structure. The orientation relationship between the two polymorphs and the epitaxial growth of the columbite phase on the YSZ substrate are also revealed. The random distribution of the rutile phase within the film is determined using fast Fourier transformation (FFT) filtering and inverse FFT images. Previous studies have reported a highly active strontium iridate catalyst for OER in acid, while the stability of the material needs more evaluation. As the second part of this thesis, cross-sectional TEM experiments were conducted to investigate the structure and the degradation of the catalyst. Measurements confirm the epitaxial growth of the films from perovskite strontium titanate substrate from HR-TEM images and selected area diffraction patterns (SADP). The loss of the materials following electrochemical testing in a sulfuric acid environment for several hours can be demonstrated by comparing pre- and post-test thin film thickness. While the thickness of the film decreases from 40 nm to 18 nm, losing more than 50\% of its materials, the smooth surface can be confirmed to change to a rough one while its bulk structure is maintained. The results provide evidence for a layer-wise degradation model. Furthermore, the surface phase structure on the post-test thin film is analyzed using the measurement from HR-TEM images. The surface region shows 3-5 nm crystalline domains corresponding to pseudocubic perovskite strontium iridate and possible amorphous materials. The final part of this dissertation focuses on molybdenum nitride thin films as a catalyst for ORR. The polycrystalline structures of the thin films with different catalytic activity synthesized under different conditions were studied using both HR-TEM and SADP. It is shown that the thin film consists of rocksalt and hexagonal molybdenum nitride has better activity performance than the film of only rocksalt crystals. The depth-dependent structure and composition of the films are determined by both fast Fourier transformation (FFT) analysis of HR-TEM images and dark field (DF) TEM images. Finally, the impact of various electrochemical testing setups on the degradation process of the Mo-N thin films is discussed by comparing the results of thin films grown under the same conditions but tested with different treatments. The results show the dissolution of the thin films mostly happens during cycling of electrochemical testing, although the structures and chemical compositions remain unchanged. In summary, unlike the common method to study the degradation of nanoparticle catalysts with TEM, this thesis shows the usefulness of advanced cross-section TEM characterization to illuminate changes in catalytic thin films after being tested in a harsh acidic environment, which is rarely carried out. For materials such as the metal oxide and nitride catalysts in this study that are often considered stable, they are shown to suffer significant degradation during the electrochemical tests.
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Nanoparticles for Catalysis written by Franklin Tao and published by Royal Society of Chemistry. This book was released on 2014-06-12 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis is a central topic in chemical transformation and energy conversion. Thanks to the spectacular achievements of colloidal chemistry and the synthesis of nanomaterials over the last two decades, there have also been significant advances in nanoparticle catalysis. Catalysis on different metal nanostructures with well-defined structures and composition has been extensively studied. Metal nanocrystals synthesized with colloidal chemistry exhibit different catalytic performances in contrast to metal nanoparticles prepared with impregnation or deposition precipitation. Additionally, theoretical approaches in predicting catalysis performance and understanding catalytic mechanism on these metal nanocatalysts have made significant progress. Metal Nanoparticles for Catalysis is a comprehensive text on catalysis on Nanoparticles, looking at both their synthesis and applications. Chapter topics include nanoreactor catalysis; Pd nanoparticles in C-C coupling reactions; metal salt-based gold nanocatalysts; theoretical insights into metal nanocatalysts; and nanoparticle mediated clock reaction. This book bridges the gap between nanomaterials synthesis and characterization, and catalysis. As such, this text will be a valuable resource for postgraduate students and researchers in these exciting fields.
Download or read book Handbook of Deposition Technologies for Films and Coatings written by Peter M. Martin and published by William Andrew. This book was released on 2009-12-01 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 3e, edited by Peter M. Martin, PNNL 2005 Inventor of the Year, is an extensive update of the many improvements in deposition technologies, mechanisms, and applications. This long-awaited revision includes updated and new chapters on atomic layer deposition, cathodic arc deposition, sculpted thin films, polymer thin films and emerging technologies. Extensive material was added throughout the book, especially in the areas concerned with plasma-assisted vapor deposition processes and metallurgical coating applications.
Download or read book Ceramic Abstracts written by and published by . This book was released on 1998 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metallic Films for Electronic Optical and Magnetic Applications written by Katayun Barmak and published by Woodhead Publishing. This book was released on 2014-02-13 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallic films play an important role in modern technologies such as integrated circuits, information storage, displays, sensors, and coatings. Metallic Films for Electronic, Optical and Magnetic Applications reviews the structure, processing and properties of metallic films. Part one explores the structure of metallic films using characterization methods such as x-ray diffraction and transmission electron microscopy. This part also encompasses the processing of metallic films, including structure formation during deposition and post-deposition reactions and phase transformations. Chapters in part two focus on the properties of metallic films, including mechanical, electrical, magnetic, optical, and thermal properties. Metallic Films for Electronic, Optical and Magnetic Applications is a technical resource for electronics components manufacturers, scientists, and engineers working in the semiconductor industry, product developers of sensors, displays, and other optoelectronic devices, and academics working in the field. - Explores the structure of metallic films using characterization methods such as x-ray diffraction and transmission electron microscopy - Discusses processing of metallic films, including structure formation during deposition and post-deposition reactions and phase transformations - Focuses on the properties of metallic films, including mechanical, electrical, magnetic, optical, and thermal properties
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2003 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1993-07 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Advances in Thin Films written by Sushil Kumar and published by Springer Nature. This book was released on 2020-08-27 with total page 721 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises the expert contributions from the invited speakers at the 17th International Conference on Thin Films (ICTF 2017), held at CSIR-NPL, New Delhi, India. Thin film research has become increasingly important over the last few decades owing to the applications in latest technologies and devices. The book focuses on current advances in thin film deposition processes and characterization including thin film measurements. The chapters cover different types of thin films like metal, dielectric, organic and inorganic, and their diverse applications across transistors, resistors, capacitors, memory elements for computers, optical filters and mirrors, sensors, solar cells, LED's, transparent conducting coatings for liquid crystal display, printed circuit board, and automobile headlamp covers. This book can be a useful reference for students, researchers as well as industry professionals by providing an up-to-date knowledge on thin films and coatings.
Download or read book Advances in Catalysis written by Bruce C. Gates and published by Academic Press. This book was released on 2009-02-17 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis is the acceleration of a chemical reaction by a catalyst, a substance that notably affects the rate of a chemical reaction without itself being consumed or altered. Since 1948, Advances in Catalysis has filled the gap between the papers that report on and the textbooks that teach in the diverse areas of catalysis research. The editors of and contributors to Advances in Catalysis are dedicated to recording progress in this area. Provides a comprehensive review of all aspects of catalytic research Contains in-depth, critical, state-of-the-art reports
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
