Revealing the Formation Mechanism and Optimizing the Synthesis Conditions of Layered Double Hydroxides for the Oxygen Evolution Reaction.

Authors :: Chen Z
Wang X
Han Z
Zhang S
Pollastri S
Fan Q
Qu Z
Sarker D
Scheu C
Huang M
Cölfen H
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2023 Mar 01; Vol. 62 (10), pp. e202215728. Date of Electronic Publication: 2023 Feb 01.
Publication Year :: 2023
Abstract: Layered double hydroxides (LDHs), whose formation is strongly related to OH <superscript>-</superscript> concentration, have attracted significant interest in various fields. However, the effect of the real-time change of OH <superscript>-</superscript> concentration on LDHs' formation has not been fully explored due to the unsuitability of the existing synthesis methods for in situ characterization. Here, the deliberately designed combination of NH <subscript>3</subscript> gas diffusion and in situ pH measurement provides a solution to the above problem. The obtained results revealed the formation mechanism and also guided us to synthesize a library of LDHs with the desired attributes in water at room temperature without using any additives. After evaluating their oxygen evolution reaction performance, we found that FeNi-LDH with a Fe/Ni ratio of 25/75 exhibits one of the best performances so far reported.<br /> (© 2023 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)

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