Leteba, Gerard M., Wang, Yi-Chi, Slater, Thomas ![]() ![]() |
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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 |
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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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