Controllable self-assembly of Pd nanowire networks as highly active electrocatalysts for direct formic acid fuel cells

Shuangyin Wang, Xin Wang, San Ping Jiang
2008 Nanotechnology  
Highly dispersed and uniform palladium nanowire networks (NWNs) are synthesized by a controllable, templateless and polyelectrolyte-mediated self-assembly process. In this method, anisotropic Pd 2+ -polysodium-p-styrenesulfonate (PSS) networks are assembled between Pd 2+ ions and SO − 3 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 nanostructures from cubic nanoparticles to
more » ... y dispersed NWNs. The Pd nanostructure formation depends on the rate of nucleation and crystallization of Pd(0) which in turn is controlled by the solution pH and reducing agent. The results demonstrate that highly dispersed and uniform Pd NWNs have a very high aspect ratio and are highly active and stable for the formic acid electrooxidation in acid media, demonstrating the promising potential of Pd NWNs as effective electrocatalysts for direct formic acid fuel cells.
doi:10.1088/0957-4484/19/45/455602 pmid:21832779 fatcat:xeaxhsdg2fa33htyrbm22zdeoa