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Author : Yun-Lin Hsiao
Publisher :
ISBN 13 :
Total Pages : 366 pages
Book Rating : 4.:/5 (237 download)
Download or read book Electrocatalysis of Anodic Oxygen-transfer Reactions at Modified Lead Dioxide Electrodes written by Yun-Lin Hsiao and published by . This book was released on 1990 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 183 pages
Book Rating : 4.:/5 (727 download)
Download or read book Electrocatalysis of Anodic Oxygen-transfer Reactions at Modified Lead Dioxide Electrodes written by and published by . This book was released on 1990 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electrocatalytic activities were compared for pure and chloride-doped beta-PbO2 (Cl-PbO2) films on gold and platinum substrates. Rate constants were increased significantly for oxidations of Mn{sup 2+}, toluene, benzyl alcohol, dimethylsulphoxide (DMSO) and benzaldehyde in acidic media by the incorporation of Cl− into the oxide films. These reactions are concluded to occur by the electrocatalytic transfer of oxygen from H2O to the reaction products. Results of x-ray diffraction studies indicate the Cl-PbO2 film continues to have the slightly distorted rutile structure of pure beta-PbO2. The observed electrocatalytic phenomena are concluded to be the beneficial consequence of surface defects generated when Cl− serves for charge compensation within the surface matrix and, thereby, increases the number of surface sites capable of adsorbing hydroxyl radicals which are transferred in the electrocatalytic O-transfer reactions. 91 refs., 44 figs., 10 tabs.
Author : Hsiangpin Chang
Publisher :
ISBN 13 :
Total Pages : 578 pages
Book Rating : 4.:/5 (27 download)
Download or read book Selective Electrocatalysis of Anodic Oxygen-transfer Reactions at Chemically Modified, Thin-film Lead Dioxide Electrodes written by Hsiangpin Chang and published by . This book was released on 1989 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : In-Hyeong Yeo
Publisher :
ISBN 13 :
Total Pages : 418 pages
Book Rating : 4.:/5 (179 download)
Download or read book Anodic Oxygen-transfer Electrocatalysis at Pure and Modified Lead Dioxide Electrodes in Acidic Media written by In-Hyeong Yeo and published by . This book was released on 1987 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (873 download)
Download or read book Anodic Oxygen-transfer Electrocatalysis at Iron-doped Lead Dioxide Electrodes written by and published by . This book was released on 1994 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research illustrated in this thesis was performed under the guidance of Professor Dennis C. Johnson beginning in March 1987. Chapter 2 concentrates on the development and electrocatalytic properties of iron-doped [beta]-PbO2 films on noble-metal substrates. Chapter 3 focuses attention on the preparation and characterization of iron-doped [beta]-PbO2 films on titanium substrates (Fe-PbO2/Ti). Chapter 4 discusses anodic evolution of ozone at Fe-PbO2/Ti electrodes. Chapter 5 describes electrochemical incineration of p-benzoquinone (BQ) at Fe-PbO2/Ti electrodes. In addition, the Appendix includes another published paper which is a detailed study of [alpha]-PbO2 films deposited on various types of stainless steel substrates.
Author : Jianren Feng
Publisher :
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.:/5 (31 download)
Download or read book Anodic Oxygen-transfer Electrocatalysis at Iron-doped Lead Dioxide Electrodes written by Jianren Feng and published by . This book was released on 1994 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 692 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 119 pages
Book Rating : 4.:/5 (727 download)
Download or read book Electrocatalysis of Anodic and Cathodic Oxygen-transfer Reactions written by and published by . This book was released on 1990 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electrocatalysis of oxygen-transfer reactions is discussed in two parts. In Part I, the reduction of iodate (IO3−) is examined as an example of cathodic oxygen transfer. On oxide-covered Pt electrodes (PtO), a large cathodic current is observed in the presence of IO3− to coincide with the reduction of PtO. The total cathodic charge exceeds the amount required for reduction of PtO and IO3− to produce an adsorbed product. An electrocatalytic link between reduction of IO3− and reduction of PtO is indicated. In addition, on oxide-free Pt electrodes, the reduction of IO3− is determined to be sensitive to surface treatment. The electrocatalytic oxidation of CN− is presented as an example of anodic oxygen transfer in Part II. The voltametric response of CN− is virtually nonexistent at PbO2 electrodes. The response is significantly improved by doping PbO2 with Cu. Cyanide is also oxidized effectively at CuO-film electrodes. Copper is concluded to serve as an adsorption site for CN−. It is proposed that an oxygen tunneling mechanism comparable to electron tunneling does not occur at the electrode-solution interface. The adsorption of CN− is therefore considered to be a necessary prerequisite for oxygen transfer. 201 refs., 23 figs., 2 tabs.
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ISBN 13 :
Total Pages : 852 pages
Book Rating : 4.3/5 (129 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph Edward Vitt
Publisher :
ISBN 13 :
Total Pages : 358 pages
Book Rating : 4.:/5 (252 download)
Download or read book Electrocatalysis of Anodic, Oxygen-transfer Reactions at Noble Metal Electrodes written by Joseph Edward Vitt and published by . This book was released on 1991 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wade H. Shafer
Publisher : Springer Science & Business Media
ISBN 13 : 1461303931
Total Pages : 427 pages
Book Rating : 4.4/5 (613 download)
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 39 (thesis year 1994) a total of 13,953 thesis titles from 21 Canadian and 159 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 39 reports theses submitted in 1994, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.
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ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.3/5 (91 download)
Download or read book Archives des sciences et compte rendu des séances de la Société written by and published by . This book was released on 2000 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brett Kimball Simpson
Publisher :
ISBN 13 :
Total Pages : 258 pages
Book Rating : 4.:/5 (517 download)
Download or read book Development of Novel Electrode Materials for the Electrocatalysis of Oxygen-transfer and Hydrogen-transfer Reactions written by Brett Kimball Simpson and published by . This book was released on 2002 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fundamental aspects involved in the electrocatalysis of anodic O-transfer reactions and cathodic H-transfer reactions are studied. The main focus of the study is to increase our knowledge of the processes controlling the transfer reactions and apply this knowledge to the development of novel electrode materials for use as electrochemical sensors. The transfer reactions have prerequisite steps of reactant adsorption at the electrode surface as well as adsorption of O atoms, for O-transfer reactions, and H atoms, for H-transfer reactions. Investigations of anodic O-transfer reactions reveal that MnO2 film electrodes show improved response for dimethyl sulfoxide (DMSO) oxidation as compared to the Au substrate. Doping of the MnO2 film electrodes with Fe(III) enhances electrocatalytic activity for DMSO oxidation. Thermally prepared RuO2 films provide an electrode material that not only exhibits electrocatalytic activity for O-transfer reactions but shows mechanical and chemical stability as well. Doping the RuO2 film electrodes with Fe(III) further increases activity and provides an electrochemical sensor with detection capabilities for DMSO, methionine, and cysteine in the range of 3.2x10−4 mM. Reasons for the increase in activity, caused by doping of the metal oxide films with Fe(III), are attributed to separation of surface sites involved in the adsorption processes required for O-transfer reactions. An investigation of H-transfer reactions, specifically nitrate reduction, initially examines various metals for activity to determine candidates for use in alloy electrodes. The Sb10Sn20Ti--0, Cu63Zn3--, and the Cu25Ni--5 alloy electrodes all show improved response for nitrate reduction as compared to their pure component metals. Reasons for the improved activity are speculated to involve the separation of surface adsorption sites for the processes involved in nitrate reduction. Further examination of Cu-Ni alloys reveals that the nitrate reduction occurs via an 8 e ̄process at the Cu--5Ni25 alloy electrode and a 6 e ̄process at the Cu50Ni50 and the Cu25Ni--5 alloy electrodes. Flow injection data obtained using Cu50Ni50 and Cu25Ni--5 electrodes exhibit detection limits for nitrate of 0.95 [Mu]M and 0.060 [Mu]M, respectively.
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ISBN 13 :
Total Pages : 768 pages
Book Rating : 4.3/5 (91 download)
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1990 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephen Everett Treimer
Publisher :
ISBN 13 :
Total Pages : 264 pages
Book Rating : 4.:/5 (517 download)
Download or read book Electrocatalytic Materials and Techniques for the Anodic Oxidation of Various Organic Compounds written by Stephen Everett Treimer and published by . This book was released on 2001 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research presented within this thesis is devoted to the development of electrocatalytic materials and methods employed to catalyze oxygen-transfer reactions in aqueous media. The use of rotated disk electrodes for the generation of Koutećky-Levich plots was evaluated for several mechanism to identify the efficacy of estimating the number of electrons (n) and the heterogeneous rate constant (k[subscript h]) from such plots. Two mathematical models for oxygen-transfer reactions were derived for no adsorption and weak adsorption of a model reactant to the rotated disk electrode. Theoretical equations were compared to experimental data and show good agreement. Lead dioxide film anodes were doped with Fe(III) and Bi(V) and compared to the activity of undoped electrodes for the voltammetric response of toluene and m-xylene. Very slightly doped Fe(III)-PbO2 films showed equal or greater heterogeneous rate constants than very highly doped Bi(V)--PbO2. A single-pass electrochemical cell was developed for the electrochemical incineration of dilute chromatographic eluent solutions. Manganese sulfate co-dissolved with the sample compounds was found to deposit onto the Pt substrate and catalyze the anodic oxidation of many compounds used for chromatographic separations. Ultraviolet light was used as a photocatalyst in the oxidation of selected organic compounds at the anodes Fe(III)-doped PbO2 and Fe(III)-doped MnO2. The ultraviolet light was found to catalyze the oxidation of both UV absorbing and non-UV absorbing molecules, indicating that the UV light activates the semi-conducting metal oxide film rather than the molecule present within the diffusion layer of the electrode. Finally, initial investigations using a Fe(III)/Mn(IV)-doped PbO2 film indicate that this film selectively oxidizes phenol and aniline to acetic acid in the presence of ultraviolet light.
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ISBN 13 :
Total Pages : 508 pages
Book Rating : 4.0/5 ( download)
Download or read book The Corrosion and Oxidation of Metals written by and published by . This book was released on 1968 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Novel Electrode Materials for the Electrocatalysis of Oxygen-Transfer and Hydrogen-Transfer Reactions written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout this thesis, the fundamental aspects involved in the electrocatalysis of anodic O-transfer reactions and cathodic H-transfer reactions have been studied. The investigation into anodic O-transfer reactions at undoped and Fe(III)[doped MnO2 films] revealed that MnO2 film electrodes prepared by a cycling voltammetry deposition show improved response for DMSO oxidation at the film electrodes vs. the Au substrate. Doping of the MnO2 films with Fe(III) further enhanced electrode activity. Reasons for this increase are believed to involve the adsorption of DMSO by the Fe(III) sites. The investigation into anodic O-transfer reactions at undoped and Fe(III)-doped RuO2 films showed that the Fe(III)-doped RuO2-film electrodes are applicable for anodic detection of sulfur compounds. The Fe(III) sites in the Fe-RuO2 films are speculated to act as adsorption sites for the sulfur species while the Ru(IV) sites function for anodic discharge of H2O to generate the adsorbed OH species. The investigation into cathodic H-transfer reactions, specifically nitrate reduction, at various pure metals and their alloys demonstrated that the incorporation of metals into alloy materials can create a material that exhibits bifunctional properties for the various steps involved in the overall nitrate reduction reaction. The Sb10Sn20Ti--0, Cu63Ni3-- and Cu25Ni--5 alloy electrodes exhibited improved activity for nitrate reduction as compared to their pure component metals. The Cu63Ni3-- alloy displayed the highest activity for nitrate reduction. The final investigation was a detailed study of the electrocatalytic activity of cathodic H-transfer reactions (nitrate reduction) at various compositions of Cu-Ni alloy electrodes. Voltammetric response for NO3− at the Cu-Ni alloy electrode is superior to the response at the pure Cu and Ni electrodes. This is explained on the basis of the synergism of the two different metal sites at these binary alloy electrodes acting within the proposed response mechanism. Accordingly, adsorbed H-atoms are generated by cathodic discharge of H at the Ni-sites whereas adsorption of NO3− occurs at the Cu-sites.
