Electrochemical Studies of Metal Deposition and Surface Chirality at Well-defined Platinum Single Crystal Electrodes PDF Download
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Author: Omar Abdullah Hazzazi
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 566
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Author: Omar Abdullah Hazzazi
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 566
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Author: Sylvie Morin
Publisher:
ISBN:
Category : Chemisorption
Languages : en
Pages : 460
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Stojan S. Djokic
Publisher: Springer Science & Business Media
ISBN: 9781441955890
Category : Science
Languages : en
Pages : 295
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Book Description
In the past few decades, research in the science of electrodeposition of metals has shown the important practical applications of electronic, magnetic, energy devices and biomedical materials. The aim of this new volume is to review the latest developments electrodeposition and present them to teachers, professionals, and students working in the field.
Author: Grzegorz (Gregory). Jerkiewicz
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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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: Mujib Ahmed
Publisher:
ISBN:
Category :
Languages : en
Pages :
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In this investigation, cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS) and rotating disc electrode (RDE) measurements of the oxygen reduction reaction (ORR) have been used to explore the complex three-phase Nafion-platinum-electrolyte interface. This interface is at the heart of the functioning membrane electrode assembly (MEA) of a fuel cell. CV was primarily used to analyse ultra-thin Nafion films, deposited (without contamination) onto various flat and stepped platinum and platinum bimetallic single crystal electrodes. For Pt{111}, XPS measurements were also used to determine Nafion surface layer thickness and to obtain surface chemical composition. CV results have shown that Nafion is a probe of adsorbed OH on platinum electrodes and for stepped surfaces, unusual structural sensitivity of Nafion-induced voltammetric peaks, ascribable to Nafion interactions with step sites, is observed as a function of average terrace width. Voltammetric results for palladium adlayers (up to two monolayers) adsorbed on Nafion coated Pt{111} and {100} in aqueous 0.1M HClO4, show the first layer palladium hydrogen underpotential deposition (HUPD) peak being much sharper and intense as compared to Nafion free surfaces. A similar phenomenon was found for platinum-palladium surface alloys in that Nafion adsorption would produce sharper, palladium HUPD peaks. This behaviour is ascribed to stronger specific adsorption of the Nafion sulphonate groups with palladium compared to platinum. It was interesting to note that for bismuth adlayers adsorbed onto Nafion coated Pt{111} and {100}, attenuation of HUPD features was identical whether or not Nafion was adsorbed but the Bi-OH redox features for Nafion coated surfaces exhibited marked differences, again ascribable to competitive adsorption of sulphonate and OH. Using RDE, it was found that the ORR for various Nafion coated Pt{hkl} electrodes was inhibited compared to Nafion free electrodes. The electrooxidation of formic acid on palladium modified, Nafion coated Pt{111}, in aqueous 0.1M HClO4, was found not to be affected by the presence of Nafion. However methanol electrooxidation was inhibited on palladium modified, Nafion coated Pt{111}. Finally a number of actual fuel cell electrocatalysts, provided by Johnson Matthey were characterised using CV. The {111} and {100} surface site densities were quantified using bismuth and germanium as surface probes. Comparisons between Nafion coated electrocatalysts and Nafion free electrocatalysts are also reported. It was found that only very marginal differences between the CV responses of both types of catalyst are recorded (in contrast to the single crystal data).
Author: Evgeni B. Budevski
Publisher: John Wiley & Sons
ISBN: 3527614923
Category : Science
Languages : en
Pages : 421
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Book Description
Electrochemical processes and methods are basic to many important scientific disciplines, materials science and nanotechnology being only two keywords. For the first time in more than twenty years this volume presents a critical survey of the foundations, methodology and applications of electrochemical phase formation and growth processes. Written by a team of three internationally renowned authors, it is an invaluable source of information for all scientists concerned with electrocrystallization of metals or the in-situ characterization of electron-conducting surfaces. Not only the numerous illustrations (partly in colour) but also the vast number of references covering the literature up to and including 1995 make this volume indispensable for every laboratory working in electrochemical or materials science.
Author: Magdalena Nuñez
Publisher: Nova Publishers
ISBN: 9781594544569
Category : Science
Languages : en
Pages : 226
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Book Description
Electrochemistry is the branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions. In a world short of energy sources yet long on energy use, electrochemistry is a critical component of the mix necessary to keep the world economies growing. Electrochemistry is involved with such important applications as batteries, fuel cells, corrosion studies, hydrogen energy conversion, and bioelectricity. Research on electrolytes, cells, and electrodes is within the scope of this old but extremely dynamic field. This book details advances in metal electrodeposition.
Author: John Lewellen Stickney
Publisher:
ISBN:
Category :
Languages : en
Pages : 622
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Author: Catherine Ann Harris
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 462
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