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Issue 5, 2015
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Nanoporous twinned PtPd with highly catalytic activity and stability

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Abstract

Growing needs for highly efficient energy storage devices have prompted increasing research efforts in energy-efficient and sustainable materials. In this context, nanoporous noble metals have been studied extensively because of their extraordinary properties. However, existing electrochemical/chemical dealloying approaches for their synthesis largely lack the ability to optimize their structure/function relationships. To overcome this limitation, we developed a thermal-decomposition strategy for the synthesis of component-controllable nanoporous PtPd alloys composed of ∼2 nm sawtooth-like ligaments induced by a high density of twinning boundaries (boundary spacing ∼ 1 nm). Such twinned and ultrathin ligaments exhibit large curvatures between concave and convex regions, associated with abundant low-coordination surface atomic steps and kinks. These low-coordination atoms are sites of high catalytic activity, as confirmed by theoretical simulations. The optimized Pt25Pd75 sample exhibits the best catalytic performance among all the currently reported catalysts, and has a mass activity of 1110 mA mg−1Pt−1 and high stability for the electro-oxidation of methanol.

Graphical abstract: Nanoporous twinned PtPd with highly catalytic activity and stability

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Article information


Submitted
17 Nov 2014
Accepted
27 Nov 2014
First published
28 Nov 2014

J. Mater. Chem. A, 2015,3, 2050-2056
Article type
Paper

Nanoporous twinned PtPd with highly catalytic activity and stability

X. Zhang, P. Guan, L. Malic, M. Trudeau, F. Rosei and T. Veres, J. Mater. Chem. A, 2015, 3, 2050
DOI: 10.1039/C4TA06250G

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