title: 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.
authors.affiliation: Department of Chemical and Biomolecular Engineering (BK21+ graduate program), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea. ookpark@kaist.ac.kr.
authors.forename: Seong Ji
authors.initials: SJ
authors.lastname: Ye
authors.forename: Do Youb
authors.initials: DY
authors.lastname: Kim
authors.forename: Shin Wook
authors.initials: SW
authors.lastname: Kang
authors.forename: Kyeong Woo
authors.initials: KW
authors.lastname: Choi
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Han
authors.forename: O Ok
authors.initials: OO
authors.lastname: Park
mesh_terms: D002384:Catalysis; D000431:Ethanol / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry*
chemical_list: D000431:Ethanol; D010165:Palladium