Galvanic replacement of electrochemically restructured copper electrodes with gold and its electrocatalytic activity for nitrate ion reduction

Balkis, A, Crawford, J and O'Mullane, A 2018, 'Galvanic replacement of electrochemically restructured copper electrodes with gold and its electrocatalytic activity for nitrate ion reduction', Nanomaterials, vol. 8, no. 10, pp. 1-13.


Document type: Journal Article
Collection: Journal Articles

Title Galvanic replacement of electrochemically restructured copper electrodes with gold and its electrocatalytic activity for nitrate ion reduction
Author(s) Balkis, A
Crawford, J
O'Mullane, A
Year 2018
Journal name Nanomaterials
Volume number 8
Issue number 10
Start page 1
End page 13
Total pages 13
Publisher MDPIAG
Abstract The electrochemical formation of nanostructured materials is a cost effective route to creating substrates that can be employed in a variety of applications. In this work the surface of a copper electrode was electrochemically restructured in an alkaline solution containing ethanol as an additive to modify the surface morphology, and generate a Cu/Cu2 O surface, which is known to be active for the electrocatalytic reduction of environmentally harmful nitrate ions. To increase the activity of the nanostructured surface it was decorated with gold prisms through a facile galvanic replacement approach to create an active Cu/Cu2 O/Au layer. The surface was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, as well as electrochemical techniques. It was found that the presence of recalcitrant oxides, and Au was beneficial for the increased activity compared to unmodified copper and undecorated restructured copper and was consistent with the incipient hydrous oxide adatom mediator model of electrocatalysis. This approach to generating nanostructured metal/metal oxide surfaces that can be galvanically replaced to create these types of composites may have other applications in the area of electrocatalysis.
Subject Nanotechnology not elsewhere classified
Keyword(s) Active sites
Electrocatalysis
Galvanic replacement
Hydrous oxides
Nanostructures
Nitrate reduction
DOI - identifier 10.3390/nano8100756
Copyright notice © 2018 by the authors. Licensee MDPI, Basel, Switzerland. Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
ISSN 2079-4991
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