Ralph E. White - Böcker

Covering both the theoretical and applied aspects of electrochemistry, this well-known monograph series presents a review of the latest advances in the field.

Integrating both theoretical and applied aspects of electrochemistry, this acclaimed monograph series presents a review of the latest advances in the field. The current volume covers ion and electron transfer across monolayers of organic surfactants, determination of current distributions governed by Laplace's equation, and three other subjects.

Integrating both theoretical and applied aspects of electrochemistry, this acclaimed monograph series presents a review of the latest advances in the field.

Number 25 of this acclaimed series breaks new ground with articles on charge transfer across liquid-liquid interfaces, electrochemical techniques to study hydrogen ingress in metals, and electrical breakdown of liquids. Also included are articles on the measurement of corrosion and ellipsometry, bringing these older subjects up to date.

The present volume presents six chapters, two of them fairly brief, covering both fundamental and applied electrochemistry. The latter aspect has, of course, historical significance in the subject as well as a major technological profile in recent decades, while intimate connections between these complementary facets of the subject have always been a driving force for its earlier and continu­ ing development. In the Modern Aspects of Electrochemistry series we have periodically included contributions from the several schools of Russi~n electrochemistry. This approach is continued in the present volume by inclusion of the chapter by Benderskii, Brodskii, Daikhin, and Velichko from the Frumkin Institute, Moscow, on phase transitions among molecules adsorbed in the double-layer interphase at electrodes. This topic has attracted attention for some years through the works of the Russian school and of Gierst and Buess-Herman. Such behavior is also related to the important phenomenon of self-assembly of molecules in films at interfaces. In Chapter 1, these authors give an account of the factors associated with two-dimensional phase transitions and associated orientation effects with polar adsorbates at electrode interfaces. The theoretical interpretation of these effects are also treated in some detail. Chapter 2, by Rusling, deals with electrochemistry and electro­ catalysis in microemulsions, thus connecting aspects of electrode kinetics, adsorption at electrode interfaces, and colloid chemistry.

From reviews of previous volumes: 'This volume continues the valuable service that has been rendered by the Modern Aspects series.'-Journal of Electroanalytical Chemistry 'Extremely well referenced and very readable....Maintains the overall high standards of the series.'-Journal of the American Chemical Society

No. 28 of this highly regarded series explores the fundamental and applied aspects of electrochemical science. This volume features two detailed studies on the rapidly developing field of electrochemical surface science.

Volume 30 of this authoritative series provides detailed information about current advances in both fundamental and applied electrochemical research.

Prof. Jerzy Sobkowski starts off this 31st volume of Modern Aspects of Electrochemistry with a far-ranging discussion of experimental results from the past 10 years of interfacial studies. It forms a good background for the two succeeding chapters. The second chapter is by S. U. M. Khan on quantum mechanical treatment of electrode processes. Dr. Khan’s experience in this area is a good basis for this chapter, the contents of which will surprise some, but which as been well refereed. Molecular dynamic simulation is now a much-used technique in physical electrochemistry and in the third chapter Ilan Benjamin has written an account that brings together information from many recent publications, sometimes confirming earlier modeling approaches and sometimes breaking new territory. In Chapter 4, Akiko Aramata’s experience in researching single crystals is put to good advantage in her authoritative article on under- tential deposition. Finally, in Chapter 5, the applied side of electrochemistry is served by Bech-Neilsen et al. in the review of recent techniques for automated measurement of corrosion. J. O’M. Bockris, Texas A&M University B. E. Conway, University of Ottawa R. E. White, University of South Carolina Contents Chapter 1 METAL/SOLUTION INTERFACE: AN EXPERIMENTAL APPROACH Jerzy Sobkowski and Maria Jurkiewicz-Herbich I. Introduction.............................................. 1 II. Molecular Approach to the Metal/Solution Interface............. 3 1. Double-Layer Structure: General Considerations .......... 3 2. Solid Metal/Electrolyte Interface.......................... 8 3. Methods Used to Study Properties ofthe Metal/Solution Interface: Role of the Solvent and the Metal............. 15 The Thermodynamic Approach to the Metal/Solution Interface 35 III.

Topics discussed here include: a mathematical treatment of periodic phenomena, with consideration of new theories about the transition between "order" and "chaos"; impedance spectroscopy as applied to the study of kinetics and mechanisms of electrode processes; the use of stoichiometric numbers in mechanism analysis; the electro-osmotic dewatering of clays with important implications for the processing of industrial waste and geotechnical stabilization; magnetic effects in electrolytic processes and the electrolytic Hall effect; and the computer analysis and modelling of mass transfer and fluid flow.

Topics discussed include: a review of the literature on the potential-of-zero charge by Trasatti and Lust; a review and discussion of nonequilibrium fluctuations in corrosion processes; a wide-ranging discussion of conducting polymers, electrochemistry, and biomimicking processes; microwave (photo)electrochemistry, from its origins to today's research opportunities, including its relation to electrochemistry; new fluorine cell design, from model development through preliminary engineering modeling, laboratory tests, and pilot plant tests; and a comprehensive account of the major and rapidly developing field of the electrochemistry of electronically conducting polymers and their applications.

Recognized experts present incisive analyses of both fundamental and applied problems in this continuation of the "Modern Aspects of Electrochemistry" series. Topics in number 35 include: impedance spectroscopy with specific applications to electrode processes involving hydrogen; fundamentals and contemporary applications of electroless metal deposition; the development of computational electrochemistry and its application to electrochemical kinetics; analysis of electrolyte solutions at high concentrations; applications of the Born theory to solvent polarization by ions and its extensions to treatment of kinetics of ionic reactions.

This text explores several aspects of electrochemistry. It includes a chapter on electrochemical nuclear magnetic resonance (EC-NMR) - a powerful non-invasive technique which brings insights to both fundamental and practical key aspects of electrocatalysis, including the design of better anodes for PEM fuel cells. There is also a chapter devoted to advances in the use of rigorous ab initio quantum chemical calculations in electrochemistry, addressed to all electrochemists, including those with very little prior exposure to quantum chemistry, and demonstrates the usefulness of ab initio calculations, including density functional theory (DFT) methods, to understand several key aspects of fuel cell electrocatalysis at the molecular level.The text also discusses the most important macroscopic and statistical thermodynamic models developed to describe adsorption phenomena on electrodes, including the state of the art adsorption isotherms, which are both rigorous, and in good agreement with experiment, as well as electrochemical promotion - the use of electrochemistry to activate and in situ tune the catalytic activity and selectivity of metal and metal oxide catalysts interfaced with solid electrolytes.

Topics discussed include: Solid State Electrochemistry, Kinetics of Electrochemical Hydrogen Entry into Metals and Alloys, Electrochemistry of Titanium, Electrochemical Oxidation of Organics on Synthetic Diamond-based Electrodes, Fuel Cells, Trace-Anion Catalysis of Outer-Sphere Heterogeneous Charge-Transfer Reactions, Thermodynamic and Transport Properties of Bridging Electrolyte - Water Systems Hydrogen, diamond electrodes, and fuel cells were all topics of intense interest at the 2003 ECS meeting in Paris.

This volume of Modern Aspects covers a wide spread of topics presented in an authoritative, informative and instructive manner by some internationally renowned specialists. Professors Politzer and Dr. Murray provide a comprehensive description of the various theoretical treatments of solute-solvent interactions, including ion-solvent interactions. Both continuum and discrete molecular models for the solvent molecules are discussed, including Monte Carlo and molecular dynamics simulations. The advantages and drawbacks of the resulting models and computational approaches are discussed and the impressive progress made in predicting the properties of molecular and ionic solutions is surveyed. The fundamental and applied electrochemistry of the silicon/electrolyte interface is presented in an authoritative review by Dr. Gregory Zhang, with emphasis in the preparation of porous silicon, a material of significant technological interest, via anodic dissolution of monocrystalline Si. The chapter shows eloquently how fundamental electrokinetic principles can be utilized to obtain the desired product morphology. Markov chains theory provides a powerful tool for modeling several important processes in electrochemistry and electrochemical engineering, including electrode kinetics, anodic deposit formation and deposit dissolution processes, electrolyzer and electrochemical reactors performance and even reliability of warning devices and repair of failed cells. The way this can be done using the elegant Markov chains theory is described in lucid manner by Professor Thomas Fahidy in a concise chapter which gives to the reader only the absolutely necessary mathematics and is rich in practical examples.

This volume begins with a tribute to Dr. Brian E. Conway by Dr. John O'M. Bockris, which is followed by six chapters. The topics covered are state of the art Polymer Electrolyte Membrane (PEM) fuel cell bipolar plates; use of graphs in electrochemical reaction networks; nano materials in lithium ion batteries; direct methanol fuel cells (two chapters); and the last chapter presents simulation of polymer electrolyte fuel cell catalyst layers. David and Valerie Bloomfield begin the first chapter with a discussion of the difficulties encountered when confronting bipolar plate development and state that the problems stem from the high corrosive nature of phosphoric acid. The water problems are mitigated but the oxidation problems increase. Bipolar plates are still not cheap, reliable or durable. In Chapter 2, Thomas Z. Fahidy reviews analysis of variance (ANOVA) and includes one way, two way, three way classification, and Latin squares observation methods. He moves on to a discussion of the applications of the analysis of covariance (ANCOVA) and goes over certain variables such as velocity, velocity and pressure drop, and product yields in a batch and flow electrolyzer. His conclusion is that proper statistical techniques are time savers which can save the experimenter and the process analyst considerable time and effort in trying to optimize the size ofstatistically meaningful experiments.

This volume analyzes and summarizes recent developments in several key interfacial electrochemical systems in the areas of fuel cell electrocatatalysis, electrosynthesis and electrodeposition. The six Chapters are written by internationally recognized experts in these areas and address both fundamental and practical aspects of several existing or emerging key electrochemical technologies. The Chapter by R. Adzic, N. Marinkovic and M. Vukmirovic provides a lucid and authoritative treatment of the electrochemistry and electrocatalysis of Ruthenium, a key element for the devel- ment of efficient electrodes for polymer electrolyte (PEM) fuel cells. Starting from fundamental surface science studies and interfacial considerations, this up-to-date review by some of the pioneers in this field, provides a deep insight in the complex catalytic-electrocatalytic phenomena occurring at the interfaces of PEM fuel cell electrodes and a comprehensive treatment of recent developments in this extremely important field. Several recent breakthroughs in the design of solid oxide fuel cell (SOFC) anodes and cathodes are described in the Chapter of H. Uchida and M. Watanabe. The authors, who have pioneered several of these developments, provide a lucid presentation d- cribing how careful fundamental investigations of interfacial electrocatalytic anode and cathode phenomena lead to novel electrode compositions and microstructures and to significant practical advances of SOFC anode and cathode stability and enhanced electrocatalysis.

This volume contains ?ve chapters. The topics covered are the cathodic reduction of nitrate, for which the key issues are pr- uct selectivity and current ef?ciency; a discussion of ionic l- uids known as molten or fused salts in key industrial processes; the properties of nanowires made of metals and semiconductors by means of electrodeposition into porous templates and template synthesis; and an overview of a range of alloys used in elect- plating, and trends in ammonium electrolysis. Also, included is a review of the applications of synchroton x-ray scattering to the electrochemical interphase. Chapter 1 by Celia Milhano and Derek Pletcher reviews the cathodic reduction of nitrate as a "truly fascinating reaction" since processes for nitrate removal from drinking water and effluents and reducing nitrates in nuclear waste is an essential step in n- lear waste disposal. The authors also review electrochemical membrane technology not involving the cathodic reduction of - trate. In Chapter 2, the authors discuss substances called ionic l- uids, and the fact that this is really a new more modern term for molten or fused salts.However, the label of ionic liquids is usu- ly applied to the liquid state of salts at or near room temperature, which is a way to differentiate low-melting salts from higher me- ing cousins. These molten or fused salts form the basis of several key industrial processes, and this chapter is primarily devoted to the non-haloaluminate ionic liquids as reviewed by Tetsuya Tsuda and Charles L. Hussey.

This volume begins with a tribute to Dr. Brian E. Conway by Dr. John O'M. Bockris, which is followed by six chapters. The topics covered are state of the art Polymer Electrolyte Membrane (PEM) fuel cell bipolar plates; use of graphs in electrochemical reaction networks; nano materials in lithium ion batteries; direct methanol fuel cells (two chapters); and the last chapter presents simulation of polymer electrolyte fuel cell catalyst layers. David and Valerie Bloomfield begin the first chapter with a discussion of the difficulties encountered when confronting bipolar plate development and state that the problems stem from the high corrosive nature of phosphoric acid. The water problems are mitigated but the oxidation problems increase. Bipolar plates are still not cheap, reliable or durable. In Chapter 2, Thomas Z. Fahidy reviews analysis of variance (ANOVA) and includes one way, two way, three way classification, and Latin squares observation methods. He moves on to a discussion of the applications of the analysis of covariance (ANCOVA) and goes over certain variables such as velocity, velocity and pressure drop, and product yields in a batch and flow electrolyzer. His conclusion is that proper statistical techniques are time savers which can save the experimenter and the process analyst considerable time and effort in trying to optimize the size ofstatistically meaningful experiments.

This volume analyzes and summarizes recent developments in several key interfacial electrochemical systems in the areas of fuel cell electrocatatalysis, electrosynthesis and electrodeposition. The six Chapters are written by internationally recognized experts in these areas and address both fundamental and practical aspects of several existing or emerging key electrochemical technologies. The Chapter by R. Adzic, N. Marinkovic and M. Vukmirovic provides a lucid and authoritative treatment of the electrochemistry and electrocatalysis of Ruthenium, a key element for the devel- ment of efficient electrodes for polymer electrolyte (PEM) fuel cells. Starting from fundamental surface science studies and interfacial considerations, this up-to-date review by some of the pioneers in this field, provides a deep insight in the complex catalytic-electrocatalytic phenomena occurring at the interfaces of PEM fuel cell electrodes and a comprehensive treatment of recent developments in this extremely important field. Several recent breakthroughs in the design of solid oxide fuel cell (SOFC) anodes and cathodes are described in the Chapter of H. Uchida and M. Watanabe. The authors, who have pioneered several of these developments, provide a lucid presentation d- cribing how careful fundamental investigations of interfacial electrocatalytic anode and cathode phenomena lead to novel electrode compositions and microstructures and to significant practical advances of SOFC anode and cathode stability and enhanced electrocatalysis.

Integrating both theoretical and applied aspects of electrochemistry, this acclaimed monograph series presents a review of the latest advances in the field. The current volume covers ion and electron transfer across monolayers of organic surfactants, determination of current distributions governed by Laplace's equation, and three other subjects.

This is the latest volume of the series praised by JACS for its "high standards," and by Chemistry and Industry for rendering a "valuable service." Experts from academic and industrial laboratories worldwide present: -- Experimental results from the last decade of interfacial studies -- A surprising quantum mechanical treatment of electrode processes -- Recent work in molecular dynamic simulations, which confirms some earlier modelistic approaches and also breaks new ground -- An in-depth look at underpotential deposition on single crystal metals, and -- The practical matter of automated corrosion measurement.

Recognized experts present incisive analysis of both fundamental and applied problems in this continuation of a highly acclaimed series. Topics discussed include: A thorough and mathematical treatment of periodic phenomena, with consideration of new theories about the transition between 'order' and 'chaos'; Impedance spectroscopy as applied to the study of kinetics and mechanisms of electrode processes; The use of stoichiometric numbers in mechanism analysis; The electro-osmotic dewatering of clays with important implications for the processing of industrial waste and geotechnical; stabilization; Magnetic effects in electrolytic processes and the electrolytic Hall effect; and The computer analysis and modeling of mass transfer and fluid flow. These authoritative studies will be invaluable for researchers in engineering, electrochemistry, analytical chemistry, materials science, physical chemistry, and corrosion science.

Topics in Number 36 include: *Electrochemical nuclear magnetic resonance (EC-NMR). This powerful non-invasive technique brings new insights to both fundamental and practical key aspects of electrocatalysis, including the design of better anodes for PEM fuel cells. *The recent impressive advances in the use of rigorous ab initio quantum chemical calculations in electrochemistry. This lucid chapter is addressed to all electrochemists, including those with very little prior exposure to quantum chemistry, and demonstrates the usefulness of ab initio calculations, including density functional theory (DFT) methods, to understand several key aspects of fuel cell electrocatalysis at the molecular level. *The most important macroscopic and statistical thermodynamic models developed to describe adsorption phenomena on electrodes, including the current state of the art adsorption isotherms, which are both rigorous, and in good agreement with experiment. *Electrochemical promotion i.e., the use of electrochemistry to activate and in situ tune the catalytic activity and selectivity of metal and metal oxide catalysts interfaced with solid electrolytes.*Lithium transport through transition metal oxides and carbonaceous materials, which is of paramount importance in rechargeable lithium batteries.

describe the engineering aspects of the three processes used in the chi or-alkali industry, and in Chapter 6, Sides reviews the macroscopic phenomena of nucleation, growth, and detachment of bubbles, and the effect of bubbles on the conduc­ tivity of and mass transfer in electrolytes.

It gives us pleasure in writing the Preface to this volume, in which we tried to bring together a number of stimulating and interesting people discussing physical electrochemistry. The first chapter, by Ashok Vijh, gives a remarkable account of electrochemistry as looked at from a physicist's point of view. Among the revelations of the chapter is that in a recent survey of leading areas in Science, two out of fifteen areas chosen were electrochemical and these two were the only chemical subjects chosen. In Mikhail Vorotyntsev's chapter, one finds a very modern study of the double layer, but tenuously connected with the simpler studies made in the safe harbor of mercury. In the pioneering chapter by Pons et al., one is looking at a cutting edge of electrochemistry at this time-the use of IR spectros­ copy in modes which allow the first practical determinations of the spectra of adsorbed species at the interface-an area pioneered by Pons himself. In Chapter 4, we have reached photoelectrochemistry once more, but now Tributsch speaks about what has rapidly become the major area of that topic, photoelectrocatalysis. Close to this chapter, and indeed intellectually connected with it, is that by Schmickler and Schultze about electron transfer reac­ tions at oxide-covered metal electrodes in which theories which are still relatively dubious for metal-solution surfaces are applied to complex systems involving oxides.

This volume of Modern Aspects contains seven chapters. The major topics covered in the first six chapters of this volume include fundamentals of solid state electrochemistry; kinetics of electrochemical hydrogen entry into metals and alloys; oxidation of organics; fuel cells; electrode kinetics of trace-anion catalysis; nano structural analysis. The last chapter is a corrected version of chapter four from Volume 35. Faisal M. AI-faqeer and Howard W. Pickering begin the first chapter by going back to 1864 and Cailletet who found that some hydrogen evolved and was absorbed by iron when it was immersed in dilute sulfuric acid. The absorption of hydrogen into metals and alloys can lead to catastrophic failures of structures. They discuss the kinetics of electrochemical hydrogen entry into metals and alloys. In chapter three, Clyde L. Briant reviews the electrochemistry, corrosion and hydrogen embrittlement of unalloyed titanium. He begins by reviewing the basic electrochemistry and general corrosion of titanium. He also discusses pitting and galvanostatic corrosion followed by a review of hydrogen embrittlement emphasizing the formation of hydrides and the effect of these on titanium's mechanical properties. Christos Comninellis and Gy6rgy F6ti discuss the oxidative electrochemical processes of organics in chapter three. They begin by defining direct and indirect electrochemical oxidation of organics. They introduce a model that allows them to distinguish between active (strong) and non-active (weak) anodes. Different classes of organic compounds are used for kinetic models of organic oxidation at active and non-active type anodes.