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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.

International Development

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ISBN: 9789535131038 9789535131045 Year: Pages: 182 DOI: 10.5772/63034 Language: English
Publisher: IntechOpen
Subject: Economics
Added to DOAB on : 2019-10-03 07:51:50

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This book brings together leading researchers in the field of international development to examine issues relating to food security, health, rural development, human development, and institutional strengthening in developing countries. Based on empirical research, the book discusses a variety of topics including nutrition-sensitive agricultural development in South Africa, household food security in Tanzania, medical research in Egypt, child mortality in Christian and Islamic countries, spot improvement of rural roads in Asia and Africa, resilience in natural disaster, the relationship between foreign aid and human development in Africa, and finally developing competencies for rural development project management through the creation of local action groups in Argentina. The book is insightful and serves as an important reference material on international development.

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