Oleylamine aging of PtNi nanoparticles giving enhanced functionality for the oxygen reduction reaction

Leteba, Gerard M., Wang, Yi-Chi, Slater, Thomas ORCID: https://orcid.org/0000-0003-0372-1551, Cai, Rongsheng, Byrne, Conor, Race, Christopher P., Mitchell, David R. G., Levecque, Pieter B. J., Young, Neil P., Holmes, Stuart M., Walton, Alex, Kirkland, Angus I., Haigh, Sarah J. and Lang, Candace I. 2021. Oleylamine aging of PtNi nanoparticles giving enhanced functionality for the oxygen reduction reaction. Nano Letters 21 (9) , pp. 3989-3996. 10.1021/acs.nanolett.1c00706

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Abstract

We report a rapid solution-phase strategy to synthesize alloyed PtNi nanoparticles which demonstrate outstanding functionality for the oxygen reduction reaction (ORR). This one-pot coreduction colloidal synthesis results in a monodisperse population of single-crystal nanoparticles of rhombic dodecahedral morphology with Pt-enriched edges and compositions close to Pt1Ni2. We use nanoscale 3D compositional analysis to reveal for the first time that oleylamine (OAm)-aging of the rhombic dodecahedral Pt1Ni2 particles results in Ni leaching from surface facets, producing aged particles with concave faceting, an exceptionally high surface area, and a composition of Pt2Ni1. We show that the modified atomic nanostructures catalytically outperform the original PtNi rhombic dodecahedral particles by more than two-fold and also yield improved cycling durability. Their functionality for the ORR far exceeds commercially available Pt/C nanoparticle electrocatalysts, both in terms of mass-specific activities (up to a 25-fold increase) and intrinsic area-specific activities (up to a 27-fold increase).

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Cardiff Catalysis Institute (CCI) Chemistry
Publisher:	American Chemical Society
ISSN:	1530-6984
Date of First Compliant Deposit:	8 February 2022
Date of Acceptance:	26 April 2021
Last Modified:	08 Dec 2023 15:15
URI:	https://orca.cardiff.ac.uk/id/eprint/147186

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