The Structure and Activity of Admetal-modified Single Crystal Platinum and Gold Electrodes PDF Download
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Author: Christina M. Johnston
Publisher:
ISBN:
Category :
Languages : en
Pages : 508
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Book Description
Author: Christina M. Johnston
Publisher:
ISBN:
Category :
Languages : en
Pages : 508
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Book Description
Author: Sean P. E. Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 404
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Book Description
Author: Yulin Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 157
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Book Description
The study of the structure-activity relationship of electrode surfaces is fundamentally important in electrocatalysis research. Yet, the methods and techniques used for the examination of structure-activity relationship so far are limited by their capabilities, and the exploration of electrochemistry at complex surfaces is very challenging. In this study, the correlation between the electrode surface structure and its corresponding activity in two electrochemical reactions were investigated: an electrochemical etching reaction and an electrocatalysis reaction. A polycrystalline Pt electrode was galvanically etched to expose the underlying well-defined crystallites serving as pseudo-single-crystal electrodes. Atomic force microscopy (AFM) complemented with electron backscatter diffraction (EBSD) was employed for the elucidation of the effects of electrode surface structure on its etching rate. Electrochemical measurements of the electrocatalytic activity of the hydrogen oxidation reaction on individual grain surfaces were performed with high spatial resolution scanning electrochemical microscopy (SECM) coupled with electron backscatter diffraction (EBSD). The etching experiment and surface characterization results show the more deeply etched regions on polycrystalline Pt surface correspond to Pt(100). The etching rate of the Pt catalyst is Pt(111), Pt(100), and Pt(110) in increasing order. The structure-reactivity relationship showed that the catalytic activity for hydrogen oxidation reaction (HOR) increases in the order Pt(100)
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 884
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Author: Deborah Joy Zurawski
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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Book Description
The modification of the electroactivity of carbon monoxide electrosorbed on platinum by the coadsorption of a variety of inorganic and organic compounds (surface lateral modifiers) was probed using linear scan voltammetry. The shift in the peak potential for the CO electrooxidation reaction induced by the presence of the modifiers was measured as the ratio of modifier to CO in the mixed adlattice was varied. All compounds coadsorbed with CO inhibited the reaction. The extent of the positive shift in the peak potential and its dependence on coverage was a function of the type of modifier and its mode of attachment to the platinum surface. Two forces have been identified as factors in the poisoning of the CO electrooxidation reaction by coadsorbates. The structural component involves an alteration of the organization of the CO adlattice and was seen to be the major factor influencing the modification of the CO electrooxidation reaction by iodine. Low energy electron diffraction (LEED) results indicate that iodine compresses the CO adlattice electrosorbed on the single crystal Pt(111) surface. It has been postulated that these compressed structures are more difficult to nucleate towards oxidation than their unmodified counterparts, therefore a higher energy is needed to activate the adlattice and a more positive peak potential is observed. An electronic component was identified by analogy with gas phase, surface science research. The coadsorbates donate electronic charge to the surface which in turn causes an increase in the backdonation of electrons to the CO molecule. This shift in electronic charge strengthens the platinum-CO bond making it more difficult to remove CO from the surface. It has also been proposed that the modifier's electrons are polarized in the interfacial electric field present at the electrode surface. The electronic charge shifted towards the metal may screen the CO from the electric field which initiates the electrooxidation reaction. Additional topics covered are the organization of CO electrosorbed on Pt(111) compared to gas phase dosed CO and a new method for the preparation of single crystals for electrochemical applications.
Author: Benedetto Corain
Publisher: Elsevier
ISBN: 0080555004
Category : Technology & Engineering
Languages : en
Pages : 471
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Book Description
Metal Nanoclusters in Catalysis and Materials Science: The Issue of Size Control deals with the synthesis of metal nanoclusters along all known methodologies. Physical and chemical properties of metal nanoclusters relevant to their applications in chemical processing and materials science are covered thoroughly. Special attention is given to the role of metal nanoclusters size and shape in catalytic processes and catalytic applications relevant to industrial chemical processing.An excellent text for expanding the knowledge on the chemistry and physics of metal nanoclusters. Divided in two parts; Part I deals with general aspects of the matter and Part II has to be considered a useful handbook dealing with the production of metal nanoclusters, especially from their size-control point of view.* Divided into two parts for ease of reference: general and operational * Separation of synthetic aspects, physical properties and applications* Specific attention is given to the task of metal nanoclusters size-control
Author: R.B. Cattell
Publisher: Elsevier
ISBN: 0080866891
Category : Psychology
Languages : en
Pages : 717
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Book Description
With essentially the same basis as the 1971 Abilities, Their Structure, Growth and Action, this new volume reflects the developments of subsequent years.
Author: Mohindar Seehra
Publisher: BoD – Books on Demand
ISBN: 1789232929
Category : Technology & Engineering
Languages : en
Pages : 432
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Book Description
The use of copper, silver, gold and platinum in jewelry as a measure of wealth is well known. This book contains 19 chapters written by international authors on other uses and applications of noble and precious metals (copper, silver, gold, platinum, palladium, iridium, osmium, rhodium, ruthenium, and rhenium). The topics covered include surface-enhanced Raman scattering, quantum dots, synthesis and properties of nanostructures, and its applications in the diverse fields such as high-tech engineering, nanotechnology, catalysis, and biomedical applications. The basis for these applications is their high-free electron concentrations combined with high-temperature stability and corrosion resistance and methods developed for synthesizing nanostructures. Recent developments in all these areas with up-to-date references are emphasized.
Author: Dieter Landolt
Publisher: EPFL Press
ISBN: 9780849382338
Category : Science
Languages : en
Pages : 640
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Book Description
Textbook; grad.
Author: Olga V. Frank-Kamenetskaya
Publisher: Springer Nature
ISBN: 3030216144
Category : Science
Languages : en
Pages : 900
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Book Description
The book represents a collection of papers presented at VI International Symposium "Biogenic - abiogenic interactions in natural and anthropogenic systems" that was held on 24-27 September 2018 in Saint Petersburg (Russia). Papers in this book cover a wide range of topics connecting with interactions between biogenic and abiogenic components in lithosphere, biosphere and technosphere. The main regarding topics are following: methods for studying the interactions between biogenic and abiogenic components; geochemistry of biogenic-abiogenic systems; biomineralization and nature-like materials and technologies; medical geology; biomineralogy and organic mineralogy; biomineral interactions in soil; biodeterioration of natural and artificial materials; biomineral interactions in extreme environment.
