Controlled morphology and dimensionality evolution of NiPd bimetallic nanostructures

Maize, Mai; El-Boraey, Hanaa A.; Ayad, Mohamed I.; Holmes, Justin D.; Collins, Gillian

Controlled morphology and dimensionality evolution of NiPd bimetallic nanostructures

dc.contributor.author	Maize, Mai
dc.contributor.author	El-Boraey, Hanaa A.
dc.contributor.author	Ayad, Mohamed I.
dc.contributor.author	Holmes, Justin D.
dc.contributor.author	Collins, Gillian
dc.contributor.funder	Ministry of Higher Education, Egypt	en
dc.contributor.funder	Egyptian Government	en
dc.contributor.funder	Egyptian Bureau for Cultural & Educational Affairs	en
dc.contributor.funder	Egyptian Embassy in London, UK	en
dc.date.accessioned	2021-01-12T14:06:10Z
dc.date.available	2021-01-12T14:06:10Z
dc.date.issued	2020-10-13
dc.date.updated	2021-01-04T15:20:37Z
dc.description.abstract	Controlling the morphology of noble metal-based nanostructures is a powerful strategy for optimizing their catalytic performance. Here, we report a one-pot aqueous synthesis of versatile NiPd nanostructures at room temperature without employing organic solvents or surfactants. The synthesis can be tuned to form zero-dimensional (0D) architectures, such as core–shell and hollow nanoparticles (NPs), as well as nanostructures with higher dimensionality, such as extended nanowire networks and three-dimensional (3D) nanodendrites. The diverse morphologies were successfully obtained through modification of the HCl concentration in the Pd precursor solution, and the reaction aging time. An in-depth understanding of the formation mechanism and morphology evolution are described in detail. A key factor in the structural evolution of the nanostructures was the ability to tune the reduction rate and to protonate the citrate stabiliser by adding HCl. Spherical core–shell NPs were formed by the galvanic replacement-free deposition of Pd on Ni NPs which can be transformed to hollow NPs via a corrosion process. High concentrations of HCl led to the transition of isotropic spherical NPs into anisotropic wormlike nanowire networks, created through an oriented attachment process. Aging of these nanowire networks resulted in the formation of 3D porous nanodendrites via a corrosion process. The diverse structures of NiPd NPs were anchored onto acid treated-activated carbon (AC) and exhibited improved catalytic efficiency towards the hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP).	en
dc.description.status	Peer reviewed	en
dc.description.version	Published Version	en
dc.format.mimetype	application/pdf	en
dc.identifier.citation	Maize, M., El-Boraey, H. A., Ayad, M. I., Holmes, J. D. and Collins, G. (2021) 'Controlled morphology and dimensionality evolution of NiPd bimetallic nanostructures', Journal of Colloid and Interface Science, 585, pp. 480-489. doi: 10.1016/j.jcis.2020.10.030	en
dc.identifier.doi	10.1016/j.jcis.2020.10.030	en
dc.identifier.endpage	489	en
dc.identifier.issn	0021-9797
dc.identifier.journaltitle	Journal of Colloid and Interface Science	en
dc.identifier.startpage	480	en
dc.identifier.uri	https://hdl.handle.net/10468/10900
dc.identifier.volume	585	en
dc.language.iso	en	en
dc.publisher	Elsevier	en
dc.relation.project	info:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2278/IE/Advanced Materials and BioEngineering Research Centre (AMBER)/	en
dc.relation.uri	https://www.sciencedirect.com/science/article/pii/S0021979720313539
dc.rights	© 2020 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)	en
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	en
dc.subject	4-nitrophenol	en
dc.subject	Catalysts	en
dc.subject	Core-shell structure	en
dc.subject	Dendritic structure	en
dc.subject	Hollow structure	en
dc.subject	Nanowire network structure	en
dc.subject	NiPd bimetallic nanoparticles	en
dc.subject	Reaction mechanism	en
dc.subject	Shape control	en
dc.subject	Structural evolution	en
dc.title	Controlled morphology and dimensionality evolution of NiPd bimetallic nanostructures	en
dc.type	Article (peer-reviewed)	en