Nanoporous twinned PtPd with highly catalytic activity and stability

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DOIResolve DOI: http://doi.org/10.1039/c4ta06250g
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TypeArticle
Journal titleJournal of Materials Chemistry A
ISSN2050-7488
Volume3
Issue5
Pages20502056; # of pages: 7
SubjectCatalytic oxidation; Decomposition; Electrooxidation; Energy efficiency; Palladium; Platinum; Catalytic performance; Decomposition strategy; Low coordination; Structure/function relationships; Sustainable materials; Theoretical simulation; Catalyst activity
AbstractGrowing 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.
Publication date
PublisherRoyal Society of Chemistry
LanguageEnglish
AffiliationNational Research Council Canada; Aerospace; Medical Devices
Peer reviewedYes
NPARC number21275760
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Record identifiere29d7dd7-5c99-4212-a434-06e885d79b70
Record created2015-07-14
Record modified2016-05-09
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