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

DOI: 10.1021/acs.nanolett.1c00706 DOI Help

Authors: Gerard M. Leteba (University of Cape Town; Macquarie University) , Yi-Chi Wang (University of Manchester; Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences; University of Chinese Academy of Sciences) , Thomas J. A. Slater (University of Manchester; Diamond Light Source) , Rongsheng Cai (University of Manchester) , Conor Byrne (University of Manchester) , Christopher P. Race (University of Manchester) , David R. G. Mitchell (University of Wollongong) , Pieter B. J. Levecque (University of Cape Town) , Neil P. Young (University of Oxford) , Stuart M. Holmes (University of Manchester) , Alex Walton (University of Manchester) , Angus I. Kirkland (Diamond Light Source; University of Oxford) , Sarah J. Haigh (University of Manchester) , Candace I. Lang (Macquarie University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nano Letters

State: Published (Approved)
Published: April 2021

Open Access Open Access

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).

Journal Keywords: ORR; electrocatalyst; nanoparticle; electron tomography; STEM-EDS; PEMFC

Diamond Keywords: Fuel Cells

Subject Areas: Chemistry, Materials, Energy

Technical Areas:

Added On: 02/05/2021 22:31


Discipline Tags:

Energy Storage Energy Physics Physical Chemistry Catalysis Chemistry Nanoscience/Nanotechnology

Technical Tags: