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Selective Electrocatalysis Of Anodic Oxygen Transfer Reactions At Chemically Modified Thin Film Lead Dioxide Electrodes
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Book Synopsis Selective Electrocatalysis of Anodic Oxygen-transfer Reactions at Chemically Modified, Thin-film Lead Dioxide Electrodes by : Hsiangpin Chang
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:
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:
Book Synopsis Electrocatalysis of Anodic Oxygen-transfer Reactions at Modified Lead Dioxide Electrodes by : Yun-Lin Hsiao
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:
Book Synopsis Electrocatalysis of Anodic Oxygen-transfer Reactions at Modified Lead Dioxide Electrodes by :
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.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anodic Oxygen-transfer Electrocatalysis at Pure and Modified Lead Dioxide Electrodes in Acidic Media by : In-Hyeong Yeo
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:
Book Synopsis Amperometric Detection and Electrochemical Oxidation of Aliphatic Amines and Ammonia on Silver-lead Oxide Thin-film Electrodes by :
Download or read book Amperometric Detection and Electrochemical Oxidation of Aliphatic Amines and Ammonia on Silver-lead Oxide Thin-film Electrodes written by and published by . This book was released on 1996 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis comprises three parts: Electrocatalysis of anodic oxygen-transfer reactions: aliphatic amines at mixed Ag-Pb oxide thin-film electrodes; oxidation of ammonia at anodized Ag-Pb eutectic alloy electrodes; and temperature effects on oxidation of ethylamine, alanine, and aquated ammonia.
Book Synopsis Anodic Oxygen-transfer Electrocatalysis at Iron-doped Lead Dioxide Electrodes by :
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.
Book Synopsis Extended Abstracts by : Electrochemical Society
Download or read book Extended Abstracts written by Electrochemical Society and published by . This book was released on 1989 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Dissertation Index by :
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1989 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrodes of Conductive Metallic Oxides by : Sergio Trasatti
Download or read book Electrodes of Conductive Metallic Oxides written by Sergio Trasatti and published by . This book was released on 1980 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anodic Oxygen-transfer Electrocatalysis at Iron-doped Lead Dioxide Electrodes by : Jianren Feng
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:
Book Synopsis Electrocatalytic Materials and Techniques for the Anodic Oxidation of Various Organic Compounds by : Stephen Everett Treimer
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.
Book Synopsis Electrocatalysis of Anodic, Oxygen-transfer Reactions at Noble Metal Electrodes by : Joseph Edward Vitt
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:
Book Synopsis Electrocatalysis of Anodic and Cathodic Oxygen-transfer Reactions by :
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.
Book Synopsis Development of Novel Electrode Materials for the Electrocatalysis of Oxygen-transfer and Hydrogen-transfer Reactions by : Brett Kimball Simpson
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.
Book Synopsis Government reports annual index by :
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
