Synthesis of chestnut-bur-like palladium nanostructures and their enhanced electrocatalytic activities for ethanol oxidation

Abstract

We report a facile method for the synthesis of Pd nanostructures with highly open structure and huge surface area by reducing Na₂PdCl₄ with ascorbic acid and using cetylpyridinium chloride (CPC) as a surfactant in an aqueous solution. The prepared Pd nanostructures had an average overall size of 70 nm and were composed of dozens of needle-like thin arms, originating from the same core, with an average thickness of 2.3 nm; the arms looked like chestnut-burs. Time evolution of Pd nanostructures implied that small Pd particles generated at the early stage of the reaction by fast reduction grew via the particle attachment growth mechanism. The morphology and size of the Pd nanostructures could be readily controlled by varying the concentration of CPC; depending on the amount of CPC, the reduction rates varied the morphology of the Pd nanostructures. Because of the huge surface area and possible catalytically active sites, the prepared chestnut-bur-like Pd nanostructures exhibited greater electrocatalytic activity toward ethanol electrooxidation compared to other Pd nanocatalysts, including cubic and octahedral Pd nanocrystals, and even commercial Pd/C.

In Situ Prepared Flexible 3D Polymer Film Photocatalyst for Highly Selective Solar Fuel Production from CO2

“…This has however not been explored so far. This may be due to the complicated synthetic protocols involving multistep reactions and sophisticated experimental skill required for constructing 3D polymers . Therefore, it is necessary to design a facile synthesis approach for obtaining 3D conjugated aromatic polymer photocatalyst.…”

Shape- and size-controlled synthesis of noble metal nanoparticles

“…It is believed that the synthesis of the chestnut-bur-like Pd nanoparticles shown in Fig. 8 can be also described by the particle attachment mechanism (Ye 2014). The chestnut-bur-like Pd nanoparticles had a highly opened nanostructure and dozens of needle-like thin arms stretched outward (Fig.…”

“…The flower-like Au@Pd nanoparticles and the chestnut-bur-like Pd nanoparticles showed excellent electrocatalytic properties toward the ethanol oxidation reaction (Fig. 10) Ye 2014). Both nanoparticles had a high electrochemically active surface area (ECSA), as determined by cyclic voltammograms (CVs) ( Fig.…”

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