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Synthesis and characterization of diverse Pt nanostructures in Nafion.

TitleSynthesis and characterization of diverse Pt nanostructures in Nafion.
Publication TypeJournal Article
Year of Publication2014
AuthorsIngle, NJC, Sode, A, Martens, I, Gyenge, E, Wilkinson, DP, Bizzotto, D
JournalLangmuir
Volume30
Pagination1871–1879
Abstract

With the aid of TEM characterization, we describe two distinct Pt nanostructures generated via the electroless reduction of Pt(NH3)4(NO2)2 within Nafion. Under one set of conditions, we produce bundles of Pt nanorods that are 2 nm in diameter and 10-20 nm long. These bundled Pt nanorods, uniformly distributed within 5 μm of the Nafion surface, are strikingly similar to the proposed hydrated nanomorphology of Nafion, and therefore strongly suggestive of Nafion templating. By altering the reaction environment (pH, reductant strength, and Nafion hydration), we can also generate nonregular polyhedron Pt nanoparticles that range in size from a few nanometers in diameter up to 20 nm. These Pt nanoparticles form a dense Pt layer within 100-200 nm from the Nafion surface and show a power-law dependence of particle size and distribution on the distance from the Nafion membrane surface. Control over the distribution and the type of Pt nanostructures in the surface region may provide a cost-effective, simple, and scaleable pathway for enhancing manufacturability, activity, stability, and utilization efficiency of Pt catalysts for electrochemical devices.

URLhttp://pubs.acs.org/doi/abs/10.1021/la403399y
DOI10.1021/la403399y
Refereed DesignationRefereed