Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 5, Pages 2050-2056Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta06250g
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Funding
- National Research Council of Canada (NRC)
- Canada Research Chairs program
- NSERC
- U.S. NSF [DMR 1005398]
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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 similar to 2 nm sawtooth-like ligaments induced by a high density of twinning boundaries (boundary spacing similar to 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(-1) (-1)(Pt) and high stability for the electro-oxidation of methanol.
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