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Electrocatalytic Properties of Strained Pd Nanoshells at Au Nanostructures: CO and HCOOH Oxidation

Abstract

The oxidations of carbon monoxide and formic acid at ultrathin Pd layers grown on Au nanoparticles were studied as a function of Pd thickness. Pd shells with thickness between 1 and 10 nm were grown on 19 nm Au nanoparticles by chemical reduction of H2PdCl4 with ascorbic acid. High-resolution transmission electron microscopy and X-ray diffraction confirm the core–shell configuration of the nanostructures. While the synthesis of pure Pd nanostructures led to a rather amorphous material, Pd nanoshells exhibited a polycrystalline structure confirming that Au nanostructures act as templates for Pd growth. Three-dimensional assemblies of nanoparticles were generated by alternate electrostatic layer-by-layer adsorption steps, involving poly-l-lysine and colloidal dispersions. Electrochemical studies in H2SO4 containing electrolyte solution demonstrate that CO coverage and anodic stripping potential are affected by the thickness of Pd nanoshells. In addition, the faradaic current density associated with HCOOH oxidation significantly increases with increasing Pd thickness. The thickness-dependent reactivity of Pd nanoshells is discussed in terms of lattice strain relaxation.

Citation

(2012). Electrocatalytic Properties of Strained Pd Nanoshells at Au Nanostructures: CO and HCOOH Oxidation. Journal of Physical Chemistry C, 692 -699. https://doi.org/10.1021/jp208998j

Acceptance Date Dec 8, 2011
Publication Date Jan 12, 2012
Journal Journal of Physical Chemistry C
Print ISSN 1932-7447
Publisher American Chemical Society
Pages 692 -699
DOI https://doi.org/10.1021/jp208998j
Keywords chemistry, nanostructures
Publisher URL https://doi.org/10.1021/jp208998j

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