Scientific Achievement Ultra-thin palladium wavy nanowires are synthesized by a novel technique and show a catalytic current density of 2.5X higher than.

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Scientific Achievement Ultra-thin palladium wavy nanowires are synthesized by a novel technique and show a catalytic current density of 2.5X higher than the conventional Pd/C catalyst towards formic acid oxidation. Microscopy reveals the origin of such high catalytic activity -- the unique wavy morphology with numerous twin boundaries. Significance and Impact This work not only offers a powerful route to the synthesis of nanowires through attachment-based growth but opens the door to rational design through atomic structure modification for novel metal nanostructures with enhanced properties. Research Details  Palladium wavy nanowires with an ultra-thin diameter of 2nm are synthesized using the polyol method without templating, and form via an attachment mechanism. The nanowires exhibit a catalytic current density 2.5X higher than conventional Pd/C catalysts towards formic acid oxidation.  The unique wavy structure and involvement of twin boundaries, as revealed by high-resolution electron microscopy, are responsible for the enhanced catalytic activity. Pd Nanowires with Unique “Wavy” Morphology Leads to Enhanced Activity for Formic Acid Oxidation (a) Electron microscopy reveals the unique wavy morphology and numerous twin structures of Pd nanowires. (b) cyclic voltammograms of formic acid oxidation over two Pd catalyst nanoparticles and Pd wavy nanowires. (c) Synthesis methods to prepare different Pd catalysts. a) d) b) c) CNMS User Highlight: Y. Wang, S. Choi, X. Zhao, S. Xie, H.-C. Peng, M. Chi, C. Z. Huang, and Y. Xia, Advanced Functional Materials DOI: /adfm (2013).

Scientific Achievement Ultra-thin palladium wavy nanowires are synthesized by a novel technique and show a catalytic current density 2.5X higher than conventional Pd/C catalyst used in fuel cells. Microscopy reveals the origin of such high catalytic activity -- a unique wavy morphology with numerous twin boundaries. Significance and Impact – High-performance palladium wavy nanowires were fabricated as catalysts for direct-formic acid fuel cells, which can be used in portable electronics. – This work demonstrates a powerful route for the synthesis of nanowire structures through attachment- based growth and opens the door for the rational design through atomic structure modifications for novel metal nanostructures with enhanced properties. Research Details Microscopy provides a unique method to reveal the mechanism responsible for the high catalytic activity of ultrathin wavy Pd nanowires for fuel cell applications. Pd Nanowires with Unique “Wavy” Morphology Leads to Enhanced Activity as Fuel Cell Catalysts a)b) c) d) (a-c) Electron microscopy reveals unique wavy morphology and numerous twin structures of Pd nanowires. (d) Synthesis method to prepare different Pd catalyst morphologies. CNMS User Highlight: Y. Wang, S. Choi, X. Zhao, S. Xie, H.-C. Peng, M. Chi, C. Z. Huang, and Y. Xia, “Polyol Synthesis of Ultra-thin Pd Nanowires via Attachment- Based Growth and Their Enhanced Activity towards Formic Acid Oxidation,” Advanced Functional Materials DOI: /adfm (2013).