Abstract
Highly dispersed and uniform palladium nanowire networks (NWNs) are synthesized by a controllable,templateless and polyelectrolyte-mediated self-assembly process. In this method, anisotropicPd2+-polysodium-p-styrenesulfonate (PSS) networks are assembled betweenPd2+ ionsand SO3− attached to the pendent aromatic ring of PSS in solution by an electrostatic attraction.Reduction of Pd(II) cations to metallic Pd(0) leads to the formation of Pd nanostructuresfrom cubic nanoparticles to highly dispersed NWNs. The Pd nanostructure formationdepends on the rate of nucleation and crystallization of Pd(0) which in turn is controlled bythe solution pH and reducing agent. The results demonstrate that highly dispersed anduniform Pd NWNs have a very high aspect ratio and are highly active and stablefor the formic acid electrooxidation in acid media, demonstrating the promisingpotential of Pd NWNs as effective electrocatalysts for direct formic acid fuel cells.
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