Understanding the enhanced rates of hydrogen evolution on dissolving magnesium
Despite the growing interest in Mg and its alloys, their use has been largely limited due to their high reactivity in aqueous environments. Improving the understanding of the basic principles of Mg corrosion represents the first step to explain and, eventually, improve the corrosion behaviour of Mg...
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doaj-440a1941fc9e4aab894216a454ac4d772020-11-24T22:01:24ZengElsevierElectrochemistry Communications1388-24812019-07-01104Understanding the enhanced rates of hydrogen evolution on dissolving magnesiumJ.A. Yuwono0C.D. Taylor1G.S. Frankel2N. Birbilis3S. Fajardo4School of Photovoltaics and Renewable Engineering, University of New South Wales Sydney, Kensington, New South Wales 2052, Australia; Department of Materials Science and Engineering, Monash University, Victoria 3800, Australia; Correspondence to: J.A. Yuwono, School of Photovoltaics and Renewable Engineering, University of New South Wales Sydney, Kensington, New South Wales 2052, Australia.Fontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA; Materials Technology and Development, DNV GL, Dublin, OH 43017, USAFontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USADepartment of Materials Science and Engineering, Monash University, Victoria 3800, Australia; College of Engineering and Computer Science, Australian National University, Acton, Australian Capital Territory 2601, AustraliaDepartment of Surface Engineering, Corrosion and Durability, National Centre for Metallurgical Research (CENIM-CSIC), Madrid 28040, Spain; Corresponding author.Despite the growing interest in Mg and its alloys, their use has been largely limited due to their high reactivity in aqueous environments. Improving the understanding of the basic principles of Mg corrosion represents the first step to explain and, eventually, improve the corrosion behaviour of Mg alloys. Herein an original mechanistic surface kinetic DFT model that clarifies the mechanism of anomalous HE on anodically polarised Mg is presented. In accordance with several experimental observations, this model describes anomalous HE proceeding at the regions dominated by anodic dissolution via the reaction of an Mg*H intermediate with water. The Mg*H intermediates undergo oxidation upon anodic polarisation, resulting in hydrogen evolution and Mg dissolution. Furthermore, it is revealed that increasing rates of an electrochemical cathodic reaction are possible within a dissolving anode. Keywords: Magnesium, Hydrogen evolution, Dissolution, Density functional theory DFT, Negative difference effect NDEhttp://www.sciencedirect.com/science/article/pii/S1388248119301456 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
J.A. Yuwono C.D. Taylor G.S. Frankel N. Birbilis S. Fajardo |
spellingShingle |
J.A. Yuwono C.D. Taylor G.S. Frankel N. Birbilis S. Fajardo Understanding the enhanced rates of hydrogen evolution on dissolving magnesium Electrochemistry Communications |
author_facet |
J.A. Yuwono C.D. Taylor G.S. Frankel N. Birbilis S. Fajardo |
author_sort |
J.A. Yuwono |
title |
Understanding the enhanced rates of hydrogen evolution on dissolving magnesium |
title_short |
Understanding the enhanced rates of hydrogen evolution on dissolving magnesium |
title_full |
Understanding the enhanced rates of hydrogen evolution on dissolving magnesium |
title_fullStr |
Understanding the enhanced rates of hydrogen evolution on dissolving magnesium |
title_full_unstemmed |
Understanding the enhanced rates of hydrogen evolution on dissolving magnesium |
title_sort |
understanding the enhanced rates of hydrogen evolution on dissolving magnesium |
publisher |
Elsevier |
series |
Electrochemistry Communications |
issn |
1388-2481 |
publishDate |
2019-07-01 |
description |
Despite the growing interest in Mg and its alloys, their use has been largely limited due to their high reactivity in aqueous environments. Improving the understanding of the basic principles of Mg corrosion represents the first step to explain and, eventually, improve the corrosion behaviour of Mg alloys. Herein an original mechanistic surface kinetic DFT model that clarifies the mechanism of anomalous HE on anodically polarised Mg is presented. In accordance with several experimental observations, this model describes anomalous HE proceeding at the regions dominated by anodic dissolution via the reaction of an Mg*H intermediate with water. The Mg*H intermediates undergo oxidation upon anodic polarisation, resulting in hydrogen evolution and Mg dissolution. Furthermore, it is revealed that increasing rates of an electrochemical cathodic reaction are possible within a dissolving anode. Keywords: Magnesium, Hydrogen evolution, Dissolution, Density functional theory DFT, Negative difference effect NDE |
url |
http://www.sciencedirect.com/science/article/pii/S1388248119301456 |
work_keys_str_mv |
AT jayuwono understandingtheenhancedratesofhydrogenevolutionondissolvingmagnesium AT cdtaylor understandingtheenhancedratesofhydrogenevolutionondissolvingmagnesium AT gsfrankel understandingtheenhancedratesofhydrogenevolutionondissolvingmagnesium AT nbirbilis understandingtheenhancedratesofhydrogenevolutionondissolvingmagnesium AT sfajardo understandingtheenhancedratesofhydrogenevolutionondissolvingmagnesium |
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