Tuning electrocatalytic activity of Pt monolayer shell by bimetallic Ir-M (M= Fe, Co, Ni or Cu) cores for the oxygen reduction reaction

Kurian A Kuttiyiel, YongMan Choi, Kotaro Sasaki, Dong Su, Sun-Mi Hwang, Sung-Dae Yim, Tae-Hyun Yang, Gu-Gon Park, Radoslav R Adzic

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31 Scopus citations

Abstract

Platinum monolayer electrocatalyst are known to exhibit excellent oxygen reduction reaction (ORR) activity depending on the type of substrate used. Here we demonstrate a relationship between the ORR electrocatalytic activity and the surface electronic structure of Pt monolayer shell induced by various IrM bimetallic cores (M=Fe, Co, Ni or Cu). The relationship is rationalized by comparing density functional theory calculations and experimental results. For an efficient Pt monolayer electrocatalyst, the core should induce sufficient contraction to the Pt shell leading to a downshift of the D-band center with respect to the Fermi level. Depending on the structure of the IrM, relative to that of pure Ir, this interaction not only alters the electronic and geometric structure but also induces segregation effects. Combined these effects significantly enhance the ORR activities of the Pt monolayer shell on bimetallic Ir cores electrocatalysts. (C) 2016 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)261-267
Number of pages7
JournalNano Energy
Volume29
DOIs
StatePublished - Nov 2016

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