Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/206677
Title: | Nanostructured Ir-based electrocatalysts for oxygen evolution prepared by galvanic displacement of Co and Ni |
Author: | Bech Holde, Freja Sebastian-Pascual, Paula Nicole Dalby, Kim Gómez, Elvira Escudero-Escribano, María |
Keywords: | Oxigen Nanoestructures Iridi Oxygen Nanostructures Iridium |
Issue Date: | 20-Aug-2023 |
Publisher: | Elsevier Ltd |
Abstract: | Proton exchange membrane (PEM) electrolysers are promising devices to produce hydrogen as a green fuel. Currently, this technology is limited by the sluggish kinetics of the oxygen evolution reaction (OER). In this work, we describe an environmentally safe method for the preparation of Ir oxide thin films (IrO2) for OER. Electrodeposition of Co and Ni was performed in the non-toxic choline chloride:urea deep eutectic solvent (ChCl:urea DES), followed by galvanic displacement reaction (GDR) of Co and Ni by Ir(IV). We evaluated how the GDR conditions, such as the metal replaced (Co or Ni), time and temperature affect both the activity and stability of the deposited IrO2 films on gold substrates. We observed that GDR of Ni at 90 ◦C induces morphological changes on the IrO2 nanostructures which resulted in higher activity and stability towards OER. We highlight that not only reducing mass loadings of Ir but also tuning the surface morphology and structure controlling the synthesis preparation, as well as investigating the role of the substrate, are key to design more active and stable OER electrocatalysts. |
Note: | Reproducció del document publicat a: https://doi.org/10.1016/j.electacta.2023.143058 |
It is part of: | Electrochimica Acta, 2023, vol. 467, p. 1-12 |
URI: | http://hdl.handle.net/2445/206677 |
Related resource: | https://doi.org/10.1016/j.electacta.2023.143058 |
ISSN: | 0013-4686 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
825946.pdf | 4.07 MB | Adobe PDF | View/Open |
This item is licensed under a Creative Commons License