Author: Grzegorz (Gregory). Jerkiewicz
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

Get Book Here

Book Description
The main body of research reported in this thesis was concerned with studies of H, and OH or O, chemisorption on polycrystalline and single-crystal Pt surfaces, including studies of the anodic growth of thick oxide films and distinction between the several states in which they are formed. In the work reported in the first part of this thesis, a standard procedure has been worked out for preparing polycrystalline Pt electrodes. Such electrodes reveal and sustain the same physical and electrochemical properties over long periods of time; this is probably the result of the discovery and use of the "electrochemical annealing" phenomenon. Thus, polycrystalline Pt electrodes can be well characterized in a reproducible way after selected controlled thermal and/or electrochemical pretreatments and are found to become reconverted to the same, stable and final state (the "electrochemically annealed" state) after prolonged cycling between 0.05 and 1.40 V, RHE, regardless of their initial pretreatment. At Pt anodes subjected to regimes of anodization at high controlled potentials for various periods of time, it was found that at least five states of the oxide film can be distinguished, in reduction, using the cyclic-voltammetry technique. The extent of growth of the oxide film at Pt proceeds according to a direct logarithmic law in time of growth for polarization potentials between 1.80 and 2.30 V, RHE. Upon further increase of the polarization time, the oxide growth rate increases some 400 times due to the onset of the high-field oxide growth mechanism of Mott and Cabreta. Upon increase of the polarization potential and time, it has been shown that multilayer phase oxide is generated on top of the quasi-2-d oxide. It is found that the quasi-2-d oxide can be reduced independently from the bulk-type oxide, leading to a situation where the thick-oxide film resides on bare Pt. It is also demonstrated that the quasi-2-d oxide resides between Pt and the thick oxide film. The oxide growth rate depends on the crystallographic orientation of the underlying metal surface. Cycling of "quenched" Pt(111) and Pt(100) into the oxide region results in surface restructuring (probably enhanced by the stress from quenching). Such pretreated Pt(111) and Pt(100) surfaces exhibit the same electrochemical behaviours as those of annealed Pt(111) and Pt(100). (Abstract shortened by UMI.).

Author: Grzegorz (Gregory) Jerkiewicz
Publisher:
ISBN:
Category : Metallic oxides
Languages : en
Pages : 472

Get Book Here

Book Description

Author: Grzegorz (Gregory) Jerkiewicz
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN:
Category : Metallic oxides
Languages : en
Pages : 472

Get Book Here

Book Description

Author: Wolfgang J. Lorenz
Publisher: John Wiley & Sons
ISBN: 3527612149
Category : Science
Languages : en
Pages : 336

Get Book Here

Book Description
A new window to local studies of interface phenomena at solid state surfaces has been opened by the development of local probe techniques such as Scanning Tunneling Microscopy (STM) or Atomic Force Microscopy (AFM) and related methods during the past fifteen years. The in-situ application of local probe methods in different systems belongs to modern nanotechnology and has two aspects: an analytical aspect and a preparative aspect. The first aspect covers the application of the local probe methods to characterize thermodynamic, structural and dynamic properties of solid state surfaces and interfaces and to investigate local surface reactions. Two methods which are still in the beginning of their development represent the second aspect: tip and cantilever. They can be used to form defined nano-objects such as molecular or atomic clusters, quantum dots etc. as well as to structure or modify solid state surfaces in the nanometer range. This IUPAC monograph is a comprehensive treatment of both aspects and presents the current state of knowledge. It is written for scientists active in the area of nanotechnology.

Author: Andrzej Wieckowski
Publisher: John Wiley & Sons
ISBN: 0470463740
Category : Science
Languages : en
Pages : 722

Get Book Here

Book Description
Wiley Series on Electrocatalysis and Electrochemistry Fuel Cell Catalysis A Surface Science Approach A Core reference on fuel cell catalysis Fuel cells represent an important alternative energy source and a very active area of research. Fuel Cell Catalysis brings together world leaders in this field, providing a unique combination of state-of-the-art theory and computational and experimental methods. With an emphasis on understanding fuel cell catalysis at the molecular level, this text covers fundamental principles, future challenges, and important current research themes. Fuel Cell Catalysis: Provides a molecular-level description of catalysis for low-temperature polymer-electrolyte membrane fuel cells, including both hydrogen-oxygen cells and direct alcohol cells Examines catalysis issues of both anode and cathode such as oxygen reduction, alcohol oxidation, and CO tolerance Features a timely and forward-looking approach through emphasis on novel aspects such as computation and bio-inspiration Reviews the use and potential of surface-sensitive techniques like vibrational spectroscopy (IR, Raman, nonlinear spectroscopy, laser), scanning tunneling microscopy, X-ray scattering, NMR, electrochemical techniques, and more Reviews the use and potential of such modern computational techniques as DFT, ab initio MD, kinetic Monte Carlo simulations, and more Surveys important trends in reactivity and structure sensitivity, nanoparticles, "dynamic" catalysis, electrocatalysis vs. gas-phase catalysis, new experimental techniques, and nontraditional catalysts This cutting-edge collection offers a core reference for electrochemists, electrocatalysis researchers, surface and physical chemists, chemical and automotive engineers, and researchers in academia, research institutes, and industry.

Author: Sylvie Morin
Publisher:
ISBN:
Category : Chemisorption
Languages : en
Pages : 0

Get Book Here

Book Description

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Get Book Here

Book Description

Author: Viola Birss
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 332

Get Book Here

Book Description

Author: Andrzej Wieckowski
Publisher: Routledge
ISBN: 1351437577
Category : Science
Languages : en
Pages : 992

Get Book Here

Book Description
This text probes topics and reviews progress in interfacial electrochemistry. It supplies chapter abstracts to give readers a concise overview of individual subjects and there are more than 1500 drawings, photographs, micrographs, tables and equations. The 118 contributors are international scholars who present theory, experimentation and applications.

Author: Shi-Gang Sun
Publisher: Elsevier
ISBN: 0080489060
Category : Science
Languages : en
Pages : 559

Get Book Here

Book Description
In-Situ Spectroscopic Studies of Adsorption at the Electrode and Electrocatalysis is a new reference on in-situ spectroscopic techniques/applications, fundamentals of electrocatalysis at molecule level, and progresses within electrochemical surface science. Presenting both essential background knowledge at graduate level and original research within the fields of spectroscopy, electrochemistry, and surface science. Featuring 15 chapters by prominent worldwide scholars, based on their recent progress in different aspects of in-situ spectroscopy studies, this book will appeal to a wide audience of scientists. In summary this book is highly suitable for graduates learning basic concepts and advanced applications of in-situ spectroscopy, electrocatalysis and electrode adsorptions.* Written by the most active scientists in the fields of spectroscopy, electrochemistry and surface science* Essential background knowledge for graduate students* A modern reference of cutting-edge scientific research