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Issue 1, 2012
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Bimetallic IrNi core platinum monolayer shell electrocatalysts for the oxygen reduction reaction

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Abstract

We synthesized a low-Pt content electrocatalyst consisting of a Pt monolayer placed on carbon-supported thermally treated IrNi core–shell structured nanoparticles using galvanic displacement of a Cu monolayer deposited at underpotentials. The Pt mass activity of the PtML/IrNi/C electrocatalyst obtained in a scale-up synthesis is approximately 3 times higher than that of the commercial Pt/C electrocatalyst. The electronic and geometrical effects of the IrNi substrate on the Pt monolayer result in its higher catalytic activity than that of Pt nanoparticles. The structure and composition of the core–shell nanoparticles were verified using transmission electron microscopy and in situX-ray absorption spectroscopy, while a potential cycling test was employed to confirm the stability of the electrocatalyst. Our experimental results, supported by the density functional calculations using a sphere-like model, demonstrate an effective way of using Pt that can resolve key problems of cathodic oxygen reduction hampering fuel cell commercialization.

Graphical abstract: Bimetallic IrNi core platinum monolayer shell electrocatalysts for the oxygen reduction reaction

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Publication details

The article was received on 04 Jul 2011, accepted on 01 Sep 2011 and first published on 28 Oct 2011


Article type: Paper
DOI: 10.1039/C1EE02067F
Citation: Energy Environ. Sci., 2012,5, 5297-5304
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    Bimetallic IrNi core platinum monolayer shell electrocatalysts for the oxygen reduction reaction

    K. A. Kuttiyiel, K. Sasaki, Y. Choi, D. Su, P. Liu and R. R. Adzic, Energy Environ. Sci., 2012, 5, 5297
    DOI: 10.1039/C1EE02067F

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