Ni-Fe layered double hydroxides for oxygen evolution Reaction: Impact of Ni/Fe ratio and crystallinity
authors Wilhelm, M; Bastos, A; Neves, C; Martins, R; Tedim, J
nationality International
journal MATERIALS & DESIGN
author keywords Oxygen Evolution Reaction; Electrocatalysis; Layered Double Hydroxides; Overpotential; Crystallinity
keywords WATER; ELECTROCATALYSTS; EFFICIENT; NANOSHEETS; GRAPHENE; SITES
abstract The Oxygen Evolution Reaction (OER), half-reaction of the water-splitting process for hydrogen production, suffers from sluggish kinetics. NiFe materials appeared as interesting catalytic materials for this reaction in alkaline electrolyzers and have been studied, particularly in the form of NiFe Layered Double Hydroxides (LDH). However, the impact of the specificity of the atomic arrangement in the LDH and of its composition on the catalytic efficiency of the material are still unknown. Herein, LDH are synthesized with Ni/Fe ratios from 2 to 4 and different levels of crystallinity to assess their electrocatalytic behavior in 0.1 M KOH. Statistical analysis of the electrochemical results allows to highlight that, while no effect from the atomic ratio is observed, an increase in the crystallinity of the LDH seem detrimental to the catalytic efficiency. (c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
publisher ELSEVIER SCI LTD
issn 0264-1275
isbn 1873-4197
year published 2021
volume 212
digital object identifier (doi) 10.1016/j.matdes.2021.110188
web of science category 10
subject category Materials Science, Multidisciplinary
unique article identifier WOS:000715711700004
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journal impact factor 6.289
5 year journal impact factor 6.214
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