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Electrochemical SPM study of 2D phase and 3D phase formation of Zn at the ionic liquid / Au(111) interface [online]

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ISBN: 3937300090 Year: DOI: 10.5445/KSP/1132004 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Chemistry (General)
Added to DOAB on : 2019-07-30 20:01:58

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Zn electrodeposition in the under- (UPD) and overpotential (OPD) ranges by means of in-situ Scanning Tunneling Microscopy (STM) was examined, supported by in-situ cyclic voltammetry and chronoamperometrie. The underpotential deposition of Zn follows a layer-by-layer growth. For the first time the formation of three successive Zn monolayers has been observed in the UPD range. It has been shown, that the UPD of Zn is complicated due to surface alloying. The same growth mechanism extends from the UPD into OPD range until Al bulk deposition sets in. The UPD of Al at 100 mV vs. Zn/Zn(II) is marked by Moiré pattern formation. For the first time in this system the effective tunneling barrier f has been measured by STS. A first insight into the 2D phase formation of electrodeposited Zn at the electrolyte / electrode interface was obtained from STM images at various times and potentials. Before a coherent layer is formed wormlike structures are observed characteristic of spinodal decomposition. This implies a first order phase transition, which has been resolved here for the first time for 2D electrodeposition.

Model-based Interpretation of the Performance and Degradation of Reformate Fueled Solid Oxide Fuel Cells

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Book Series: Schriften des Instituts für Werkstoffe der Elektrotechnik, Karlsruher Institut für Technologie / Institut für Werkstoffe der Elektrotechnik ISSN: 18681603 ISBN: 9783731500063 Year: Volume: 24 Pages: III, 120 p. DOI: 10.5445/KSP/1000034160 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:01
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Solid oxide fuel cells offer great prospects for the sustainable, clean and safe conversion of various fuels into electrical energy. In this thesis, the performance-determining loss processes for the cell operation on reformate fuels are elucidated via electrochemical impedance spectroscopy. Model-based analyses reveal the electrochemical fuel oxidation mechanism, the coupling of fuel gas transport and reforming chemistry and the impact of fuel impurities on the degradation of each loss process.

Ion Exchange Technologies

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ISBN: 9789535108368 9789535142652 Year: Pages: 378 DOI: 10.5772/2925 Language: English
Publisher: IntechOpen
Subject: Chemistry (General)
Added to DOAB on : 2019-10-03 07:51:49

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This book contains information about the technological development of ion exchange in their application for industrial processes. Widely used and well known fields of ion exchange like chromatography and electromembrane technology are described in this book with experimental details. Designing new materials for nanotechnology and nanomaterials as ion exchanger are also explained by experimental proofs. Ion exchange book is suitable not only for postgraduate students but also for researchers in chemistry, biochemistry and chemical technology.

Progress and Developments in Ionic Liquids

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ISBN: 9789535129011 9789535129028 9789535141082 Year: Pages: 606 DOI: 10.5772/62621 Language: English
Publisher: IntechOpen
Subject: Chemistry (General)
Added to DOAB on : 2019-10-03 07:51:49

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Ionic liquids, including the newer subcategory of deep eutectic solvents, continue to attract a great deal of research attention in an even increasing number of areas, including traditional areas such as synthesis (organic and materials), electrochemistry, and physical property studies and predictions, as well as less obvious areas such as lubrication and enzymatic transformations. In this volume, recent advances in a number of these different areas are reported and reviewed, thus granting some appreciation for the future that ionic liquid research holds and affording inspiration for those who have not previously considered the application of ionic liquids in their area of interest.

Phthalocyanines and Some Current Applications

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ISBN: 9789535132554 9789535132561 Year: Pages: 254 DOI: 10.5772/65623 Language: English
Publisher: IntechOpen
Subject: Chemistry (General)
Added to DOAB on : 2019-10-03 07:51:50

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Since their initial accidental synthesis and characterization in Scotland in the late 1920s, there has been a strong research focus on the use of phthalocyanines (Pcs) as dyes and pigments. In recent years, active research fields have included their use in electrophotography, photovoltaic and solar cells, molecular electronics, Langmuir-Blodgett films, photosensitizers, electrochromic display devices, gas sensors, liquid crystals, low-dimensional conductors, and optical disks. Phthalocyanines possess interesting biological, electronic, optical, catalytic, and structural properties. The main disadvantage is their insolubility in common solvents due to strong intermolecular - interactions. The solubility of phthalocyanines can be increased by various methods such as the formation of anionic and cationic species and both axial and peripheral substitution. Substitution at the nonperipheral and peripheral positions of the benzo moieties usually enhances their solubility in organic solvents. The most important advantage of phthalocyanines compared to porphyrins is that their Q bands lie at longer wavelengths and are considerably more intense. In this book, you will find synthesis and some applications of various phthalocyanine derivatives.

Redox - Principles and Advanced Applications

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ISBN: 9789535133933 9789535133940 Year: Pages: 250 DOI: 10.5772/66005 Language: English
Publisher: IntechOpen
Subject: Chemistry (General)
Added to DOAB on : 2019-10-03 07:51:50

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Redox reactions are central to the major element cycling, many cell cycles, many chemisorption and physisorption processes, trace element mobility from rocks and sediments toward wells, aquifers, trace element toxicity toward life forms, and most remediation schemes including water treatments; over the last three decades, the field has attracted a lot of scientists, and a great deal of researches has been done in redox chemistry. This book provides a very broad overview of the state of the art of understanding redox processes, which starts with giving a concise introduction that describes the origin, historical background, and the development of the redox definitions. The book is organized into two sections that include ten chapters and introduces, in Section 1, generalized electron balance theory and its applications in electrolytic redox systems, redox-active molecules and its applications in device memory, fundamentals and applications of flow batteries and their integration into antidirect current, and donor acceptor titrations of displacement and electronic transference. Section 2 introduces redox in biological processes, including roles of reactive oxygen species in respiration, metabolism, and regulations, and redox in physiological processes as redox-sensitive TRP channels TRPA1 and TRPM2. All chapters are written by different authors (with the exception of Chapter 1 [Introduction]). This clearly reflects the broad range of topics that have been covered by experts in the field.

Electrocatalysts for Fuel Cells and Hydrogen Evolution - Theory to Design

Authors: --- ---
ISBN: 9781789848120 9781789848137 Year: Pages: 128 DOI: 10.5772/intechopen.72563 Language: English
Publisher: IntechOpen
Subject: Chemistry (General)
Added to DOAB on : 2019-10-03 07:51:52

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The book starts with a theoretical understanding of electrocatalysis in the framework of density functional theory followed by a vivid review of oxygen reduction reactions. A special emphasis has been placed on electrocatalysts for a proton-exchange membrane-based fuel cell where graphene with noble metal dispersion plays a significant role in electron transfer at thermodynamically favourable conditions. The latter part of the book deals with two 2D materials with high economic viability and process ability and MoS2 and WS2 for their prospects in water-splitting from renewable energy.

Voltammetry

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ISBN: 9781789853230 9781789853247 9781838808471 Year: Pages: 116 DOI: 10.5772/intechopen.75223 Language: English
Publisher: IntechOpen
Subject: Chemistry (General)
Added to DOAB on : 2019-10-03 07:51:53

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Voltammetry is a very important electrochemical technique that is used to study electrode surface reactions. It helps scientists to understand the behavior of electrochemically active species and the performance of the material being investigated. Voltammetry is commonly used in different fields ranging from energy, sensing, and corrosion applications. It is mainly performed to acquire qualitative information about electrochemical reactions. The interpretation of voltammetric results differs from application to application. In this text, the fundamentals and theories of voltammetry are covered. This book aims at providing interpretations of voltammetric techniques as they are applied in different fields. The various types of voltammetry are covered, and the significance of each type is explained. The topic covered in this book include interpretation of voltammetry in energy, corrosion and sensing applications.

Impedance Spectroscopy

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ISBN: 9783110557121 9783110558920 9783110557169 Year: Pages: 203,00 DOI: 10.1515/9783110558920 Language: English
Publisher: De Gruyter Grant: Knowledge Unlatched - 102158
Subject: Agriculture (General)
Added to DOAB on : 2019-04-30 11:21:02
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This book covers new advances in the field of impedance spectroscopy including fundamentals, methods and applications. It releases selected extended and peer reviewed scientific contributions from the International Workshop on Impedance Spectroscopy (IWIS 2017) focussing on detailed information about recent scientific research results in electrochemistry and battery research, bioimpedance measurement, sensors, system design, signal processing.

Polyoxometalates

ISBN: 9783038421610 9783038421627 Year: Pages: 254
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Added to DOAB on : 2016-05-12 11:55:09
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