Download Free Studies Of Oxygen Reduction At A Rotating Disk Electrode Book in PDF and EPUB Free Download. You can read online Studies Of Oxygen Reduction At A Rotating Disk Electrode and write the review.

Rotating Electrode Methods and Oxygen Reduction Electrocatalysts provides the latest information and methodologies of rotating disk electrode and rotating ring-disk electrode (RDE/RRDE) and oxygen reduction reaction (ORR). It is an ideal reference for undergraduate and graduate students, scientists, and engineers who work in the areas of energy, electrochemistry science and technology, fuel cells, and other electrochemical systems. Presents a comprehensive description, from fundamentals to applications, of catalyzed oxygen reduction reaction and its mechanisms Portrays a complete description of the RDE (Rotating Disc Electrode)/RRDE (Rotating Ring-Disc Electrode) techniques and their use in evaluating ORR (Oxygen Reduction Reaction) catalysts Provides working examples along with figures, tables, photos and a comprehensive list of references to help understanding of the principles involved
Here, an accurate and efficient assessment of activity is critical for the research and development of electrocatalysts for oxygen reduction reaction (ORR). Currently, the methodology combining the thin-film rotating disk electrode (TF-RDE) and potentiodynamic polarization is the most commonly used to pre-evaluate ORR activity, acquire kinetic data (i.e., kinetic current, Tafel slope, etc.), and gain understanding of the ORR mechanism. However, it is often neglected that appropriate potentiodynamic parameters have to be chosen to obtain reliable results. We first evaluate the potentiodynamic and potentiostatic polarization measurements with TF-RDE to examine the ORR activity of Pt nanoelectrocatalyst. Furthermore, our results demonstrate that besides depending on the nature of electrocatalyst, the apparent ORR kinetics also strongly depends on the associated potentiodynamic parameters, such as scan rate and scan region, which have a great effect on the coverage of adsorbed OHad/Oad on Pt surface, thereby affecting the ORR activities of both nanosized and bulk Pt. However, the apparent Tafel slopes remained nearly the same, indicating that the ORR mechanism in all the measurements was not affected by different potentiodynamic parameters.
Important advances in a subject are as often promoted by a new technique as by new concepts and theories. In the study of electrode reactions which involve diffusion in a primary or a secondary step, the development and use of techniques involving rotating disc electrodes and derived instrumentation based on ring-disc and split-ring systems has enabled advances of great importance to be made in the quantitative examination of diffusion processes at electrodes and their role in electrode processes generally. The technique allows precisely defined mass-transport conditions to be set up which can be subjected to exact mathe matical analysis so that quantitative treatment of hydrodynamic and diffusion behavior can be made. Of special interest for elec trochemists is the opportunity which the rotating ring-disc system offers for studying solution-soluble intermediates in sequential electrode processes and the kinetics of their reactions in solution. In this book by Pleskov and Filinovskii, both the experimental techniques and the mathematical analysis for the treatments of results for various conditions and types of reaction are described in detail. We believe that presentation of work that has been car ried out by means of rotating electrode techniques, to a large extent by Russian workers, in the form of a concise book will be of great value both to electrochemists and kineticists, and those interested in the physics of fluid motion.
This book discusses systematically the theoretical research and the applications of electrochemical oxygen reduction. Oxygen reduction reaction is a common issue in electrochemistry, but is also an important process involved in the field of energy, cryogenic fuel cells, metal–air cells, oxygen sensors and hydrogen peroxide preparation. This book is divided into 6 chapters; it starts with a description of dynamic mechanisms, followed by a detailed introduction on the related experimental methods and related catalyst preparation technology. By providing the basic methods and testing techniques, and by demonstrating their applications, it helps readers gain a better understanding of oxygen reduction reactions, making it a valuable resource for the industrialization of scientific research achievements. Accordingly, the book appeals to a broad readership, particularly graduate students, those working at universities and research organizations, and industrial researchers.
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.