4.8 Article

Competitive Effect in The Growth of Pd-Au-Pd Segmental Nanorods

Journal

CHEMISTRY OF MATERIALS
Volume 28, Issue 20, Pages 7394-7403

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b02871

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Funding

  1. NSFC [21471117, 21173159, 51420105002]

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Growing other metals on decahedral nanoparticles (NPs) is an important approach to synthesize segmental multimetallic nanorods (NRs) with a penta-fold twinned (PFT) structure. So far, only limited such structures, e.g., Ag-Au-Ag and Pd-Ag or Pd-Cu PFT NRs, can be realized by this approach. To explore more multimetallic structures is important for both synthesizing more multimetallic NRs with a PFT structure for various potential applications and understanding their formation mechanism. Herein, we report the synthesis of Pd-Au-Pd segmental NRs with controlled sizes by growing Pd atoms on Au decahedra using hexadecyltrimethylammonium bromide (CTAB) and I- as growth modifiers. The growth mechanism of Pd-Au-Pd PFT NRs was investigated systematically. It was figured out that the growth of Pd-Au-Pd NRs was determined by two competitions (CTAB competes with I- in complexing with H2PdCl4 and in adsorbing on Au decahedra). It is also demonstrated that Au-Pd-Au NRs had higher activity than commercial Pd/C catalyst in electrocatalytic oxidization of formic acid.

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