Modelling and Kinetic Studies of Oxygen Reduction Reaction at a Rotating Ring Disk Electrode in Acidic Solutions PDF Download
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Author: Qingbo Dong
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Category : Proton exchange membrane fuel cells
Languages : en
Pages : 346
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Author: Qingbo Dong
Publisher:
ISBN:
Category : Proton exchange membrane fuel cells
Languages : en
Pages : 346
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Author: Prosper Kwasi Adanuvor
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Category : Electrochemistry, Industrial
Languages : en
Pages : 354
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Author: Melvyn Forbes
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Category : Electrodes
Languages : en
Pages : 406
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Category : Dissertations, Academic
Languages : en
Pages : 1006
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Category : Power resources
Languages : en
Pages : 1316
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Category : Chemistry
Languages : en
Pages : 858
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Author: Jacek Lipkowski
Publisher: John Wiley & Sons
ISBN: 9780471246732
Category : Science
Languages : en
Pages : 398
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A comprehensive review of advances in one of today's most technologically important research fields. Spurred on by society's increasingly urgent demand for an inexpensive, environment-friendly alternative to the internal combustion engine, research into electrocatalytic fuel cells has yielded many exciting advances in the past few years. This rapid rate of progress, however, has created a daunting challenge for anyone attempting to track the important new trends in electrocatalysis by sorting through the huge and rapidly growing body of world literature in the field. Electrocatalysis was designed to save scientists hours of arduous legwork by providing an authoritative review of the most important recent advances in all technologically relevant aspects of electrocatalysis. Leading researchers from North America, Europe, and the Far East share what they know about an array of related topics, including: * Electrocatalysis of hydrogen and oxygen electrode reactions * Electrooxidation of small organic molecules * Design and synthesis of new electrocatalytic materials * The distribution and storage of hydrogen in metal hydrides * Hydrogenation of organic compounds as a means of hydrogen storage * Electron, ion, and atom transfer reactions * Influence of the double-layer structure on the rate of charge transfer * A unified theory of electron and ion transfer reactions at metal electrodes. Electrocatalysis is an indispensable working resource for electrochemists, chemical engineers, surface scientists, and materials scientists.
Author: Nicholas Stefan Georgescu
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Category : Chemical engineering
Languages : en
Pages : 208
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This thesis addresses theoretical aspects of systems of relevance to energy conversion, energy storage and the nitrogen cycle, as studied by rotating disk and ring-disk electrode techniques. In particular, the non-linear character of Koutecky-Levich plots often reported in the literature for the oxygen reduction reaction, ORR, and the hydrogen peroxide reduction, HPRR, have been ascribed to the interplay between mass transport of intermediates away from the electrode surface and electrode kinetics. Also assessed was the validity of XH2O2 , a popularfigure of merit used to rank the efficacy of electrocatalysts towards the ORR. In another set of studies, numerical simulations were performed to determine the amount of superoxide produced at the disk of a rotating ring-disk electrode as detected by a functionalized concentric ring electrode.Also examined were systems involving partially-active surfaces involving in one case bromide adsorbed on Pt as a poisoning species for the ORR and HPR and bromide adsorption on Au as an electrocatalyst for the reduction of hexaaquairon(III) ion in aqueous electrolytes. In both cases, very small effects very found for bromide at small coverages. In related studies involving nanoparticles of electrocatalysts dispersed on otherwise inert supports, a full30theoretical analysis for thin films of such materials bonded to a rotating disk electrode yielded results which support the use of a modified Koutecky-Levich equation for the determination of rate constants for first order reactions.Finally, two further reactions of interest were studied, namely the bromide-bromine- tribromide reaction couple, where it was accurately predicted that negligible effects on the current would result from the formation of tribromide, as well as the reduction of hydroxylamine on adsorbed hemin on glassy carbon, for which a model was proposed that could account semiquantitatively for data collected with a RDE. Lastly, theoretical aspects of ohmic microscopy were investigated that served to validate interpretation of experimental data in terms of a primary current distribution.
Author: Ronald William Zurilla
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Category :
Languages : en
Pages : 231
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The research covered in the document was undertaken to achieve a better understanding of the oxygen reduction mechanism on gold by use of a rotating disk electrode with ring and to ascertain the role of hydrogen peroxide in the reaction path. Experiments were designed to control the amount of hydrogen peroxide in solution and to minimize the effect of impurities. Gold was chosen as an electrode material since surface oxide effects were expected to be minimal. The electrochemistry of O2 was studied on gold in 0.1 M NaOH and 0.1 M HClO4 with the rotating disk and ring-disk techniques. Care has been taken to prevent contamination of the solutions with impurities, particularly platinum. The result is that HO2( - ) or H2O2 is formed during the reduction of O2 in alkaline and acid solutions and that most of the peroxide diffuses away from the electrode. The further reduction of HO2( - ) in 0.1 M NaOH resulted in a significant contribution to the disk current in the potential range where O2 is reduced while the reduction of H2O2 in 0.1 M HClO4 contributed very little to the disk current. The ring-disk data in 0.1 M NaOH demonstrated that only a series reaction scheme (O2 yielding HO2( - ) yielding OH( - ) where HO2( - ) is either the adsorbed or desorbed species) is operative. (Author).
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Category : Aeronautics
Languages : en
Pages : 1370
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
