Formation of nanostructured porous Cu-Au surfaces : the influence of cationic sites on (electro)-catalysis

Najdovski, I., Selvakannan, P., Bhargava, S.K, & O'Mullane, A.P. (2012) Formation of nanostructured porous Cu-Au surfaces : the influence of cationic sites on (electro)-catalysis. Nanoscale, 4(20), pp. 6298-6306.

View at publisher

Abstract

The fabrication of nanostructured bimetallic materials through electrochemical routes offers the ability to control the composition and shape of the final material that can then be effectively applied as (electro)-catalysts. In this work a clean and transitory hydrogen bubble templating method is employed to generate porous Cu–Au materials with a highly anisotropic nanostructured interior. Significantly, the co-electrodeposition of copper and gold promotes the formation of a mixed bimetallic oxide surface which does not occur at the individually electrodeposited materials. Interestingly, the surface is dominated by Au(I) oxide species incorporated within a Cu2O matrix which is extremely effective for the industrially important (electro)-catalytic reduction of 4-nitrophenol. It is proposed that an aurophilic type of interaction takes place between both oxidized gold and copper species which stabilizes the surface against further oxidation and facilitates the binding of 4-nitrophenol to the surface and increases the rate of reaction. An added benefit is that very low gold loadings are required typically less than 2 wt% for a significant enhancement in performance to be observed. Therefore the ability to create a partially oxidized Cu–Au surface through a facile electrochemical route that uses a clean template consisting of only hydrogen bubbles should be of benefit for many more important reactions.

Impact and interest:

20 citations in Scopus
Search Google Scholar™
19 citations in Web of Science®

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

50 since deposited on 19 Nov 2013
18 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 64315
Item Type: Journal Article
Refereed: Yes
Additional Information: Prior to commencement at QUT
DOI: 10.1039/C2NR31409F
ISSN: 2040-3372
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Royal Society of Chemistry
Deposited On: 19 Nov 2013 23:49
Last Modified: 10 Nov 2014 02:03

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page