Author: Jana Dogel
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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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.

Author: Evgeni B. Budevski
Publisher: John Wiley & Sons
ISBN: 3527614923
Category : Science
Languages : en
Pages : 421

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Electrochemical processes and methods are basic to many important scientific disciplines, materials science and nanotechnology being only two keywords. For the first time in more than twenty years this volume presents a critical survey of the foundations, methodology and applications of electrochemical phase formation and growth processes. Written by a team of three internationally renowned authors, it is an invaluable source of information for all scientists concerned with electrocrystallization of metals or the in-situ characterization of electron-conducting surfaces. Not only the numerous illustrations (partly in colour) but also the vast number of references covering the literature up to and including 1995 make this volume indispensable for every laboratory working in electrochemical or materials science.

Author: Liu Zhen
Publisher:
ISBN: 9783945086780
Category :
Languages : en
Pages :

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Author: Zhen Liu
Publisher:
ISBN: 9783945086773
Category :
Languages : en
Pages : 104

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Author: Jayme Keist
Publisher:
ISBN:
Category :
Languages : en
Pages : 316

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Ionic liquids have received considerable attention as an alternative electrolyte for rechargeable battery systems. The goal of this investigation is to develop an understanding on the electrodeposition behavior of zinc within ionic liquid electrolytes and determine whether the unique properties of ionic liquids may allow for enhanced cyclability of the zinc electrode for rechargeable battery systems. Three different analysis techniques are employed for the investigation of the zinc deposition behavior within an imidazolium based ionic liquid electrolyte. First, the electrochemical behavior of the electrodeposition behavior is analyzed by cyclic voltammetry and potential step methods. Second, in-situ atomic force microscopy (AFM) is conducted to investigate the morphological evolution of zinc during electrodeposition. Finally, in-situ ultra-small-angle X-ray scattering (USAXS) is conducted during the electrodeposition of zinc to understand how the electrode surface evolves during electrodeposition and help confirm the results obtained from the in-situ AFM analysis. The ionic liquid electrolyte chosen for the investigation of zinc electrodeposition is an imidazolium based system consisting of zinc trifluoromethanesulfonate (Zn(OTf)2) dissolved within 1-butyl-3-methyl-imidazolium trifluoromethanesulfonate (BMIm OTf), and electrodeposition analysis is conducted on a Pt disk electrode. The behavior of Zn/Zn(II) within the ionic liquid electrolyte is analyzed at various deposition overpotentials, Zn(OTf)2 concentrations, and temperatures. Three distinct morphological behaviors are observed during the in-situ AFM analysis: growth of boulder like morphology, growth dominated by favorably oriented grains, and the formation of surface instabilities that manifested as agglomerate islands. The electrodeposition growth of Zn dominated by favorably oriented grains obtains a steady state where the surface roughness remained constant despite continued growth. The in-situ USAXS analysis confirms the results observed by the in-situ AFM analysis. In addition, the USAXS data shows that the zinc deposition behavior is hierarchical whereby the main scattering entities exhibited a sub-structure that remains constant in size with continued deposition. The results of this research indicate that zinc deposition within an ionic liquid electrolyte can obtain a compact and dense morphology. Furthermore, the morphology can evolve under a steady state condition under certain deposition parameters identified by this research. The improved deposition morphology of zinc within ionic liquid electrolytes may help improve the cycling performance of the zinc electrode and help make zinc based rechargeable batteries a viable alternative for energy storage applications.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 123

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Author: Jacques Hubert Olga Joseph Wijenberg
Publisher:
ISBN:
Category :
Languages : en
Pages : 87

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Author: Mirtat Bouroushian
Publisher: Springer Science & Business Media
ISBN: 3642039677
Category : Science
Languages : en
Pages : 365

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Book Description
The author provides a unified account of the electrochemical material science of metal chalcogenide (MCh) compounds and alloys with regard to their synthesis, processing and applications. Starting with the chemical fundamentals of the chalcogens and their major compounds, the initial part of the book includes a systematic description of the MCh solids on the basis of the Periodic Table in terms of their structures and key properties. This is followed by a general discussion on the electrochemistry of chalcogen species, and the principles underlying the electrochemical formation of inorganic compounds/alloys. The core of the book offers an insight into available experimental results and inferences regarding the electrochemical preparation and microstructural control of conventional and novel MCh structures. It also aims to survey their photoelectrochemistry, both from a material-oriented point of view and as connected to specific processes such as photocatalysis and solar energy conversion. Finally, the book illustrates the relevance of MCh materials to various applications of electrochemical interest such as (electro)catalysis in fuel cells, energy storage with intercalation electrodes, and ion sensing.

Author: International Union of Pure and Applied Chemistry. Physical and Biophysical Chemistry Division
Publisher: Royal Society of Chemistry
ISBN: 0854044337
Category : Reference
Languages : en
Pages : 240

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Book Description
Prepared by the IUPAC Physical Chemistry Division this definitive manual, now in its third edition, is designed to improve the exchange of scientific information among the readers in different disciplines and across different nations. This book has been systematically brought up to date and new sections added to reflect the increasing volume of scientific literature and terminology and expressions being used. The Third Edition reflects the experience of the contributors with the previous editions and the comments and feedback have been integrated into this essential resource. This edition has been compiled in machine-readable form and will be available online.