Topographical and compositional engineering of core-shell Ni@Pt ORR electro-catalysts

Gerard M. Leteba, David R. G. Mitchell, Pieter B. J. Levecque, Eric van Steen, Candace I. Lang*

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Downloads (Pure)

Abstract

Complex faceted geometries and compositional anisotropy in alloy nanoparticles (NPs) can enhance catalytic performance. We report on the preparation of binary PtNi NPs via a co-thermolytic approach in which we optimize the synthesis variables, which results in significantly improved catalytic performance. We used scanning transmission electron microscopy to characterise the range of morphologies produced, which included spherical and concave cuboidal core-shell structures. Electrocatalytic activity was evaluated using a rotating disc electrode (1600 rpm) in 0.1 M HClO4 ; the electrocatalytic performance of these Ni@Pt NPs showed significant (~11-fold) improvement compared to a commercial Pt/C catalyst. Extended cycling revealed that electrochemical surface area was retained by cuboidal PtNi NPs post 5000 electrochemical cycles (0.05-1.00 V, vs. SHE). This is attributed to the enclosure of Ni atoms by a thick Pt shell, thus limiting Ni dissolution from the alloy structures. The novel synthetic strategy presented here results in a high yield of Ni@Pt NPs which show excellent electro-catalytic activity and useful durability.
Original languageEnglish
Pages (from-to)29268-29277
Number of pages10
JournalRSC Advances
Volume10
Issue number49
DOIs
Publication statusPublished - 7 Aug 2020

Bibliographical note

Copyright the Publisher 2020. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Fingerprint Dive into the research topics of 'Topographical and compositional engineering of core-shell Ni@Pt ORR electro-catalysts'. Together they form a unique fingerprint.

Cite this