Jump to main content
Jump to site search


pH-dependent Growth of Atomic Pd Layers on Trisoctahedral Gold Nanoparticles to Realize Enhanced Performance in Electrocatalysis and Chemical Catalysis

Abstract

In this work, the controlled epitaxy growth of ultrathin Pd shells of a few atomic layer (denoted as nL) on the surfaces of gold nanoparticles (Au NPs) of different morphologies (trisoctahedral, cubic, and spherical shapes) as the cores in the presence of cetyltrimethylammonium chloride (CTAC) are achieved by regulating the pH value of the aqueous CTAC solution and finely tuning the amount of the Pd precursors. It is found that the critical shell thickness for epitaxy Pd growth under the optimal pH value is determined to be 4 atomic layers, taking {331}-faceted trisoctahedral (TOH) Au@PdnL NPs as example, on the basis of results of atomic-resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images. Moreover, the resulting TOH Au@Pd1L NPs (100.9 m2 g-1, 13.2 A mgPd-1 and 13.1 mA cm-2) exhibit excellent electrocatalytic performance and a long-term electrocatalytic activity for ethanol oxidation, which are about 4.8-fold, 66-fold, and 21.8-fold better than commercial Pd/C catalysts (31 m2 g-1, 0.2 A mgPd-1, and 0.6 mA cm-2). Furthermore, the resulting TOH Au@Pd1L NPs can not only markedly enhance chemical catalytic activity for the reduction of 4-NP, but also achieve in situ SERS monitoring of reaction process of Pd-catalyzed reduction of 4-NTP. Thus, our work may provide a new way to fabricate core-shell (CS) bimetallic NPs with both merits of metals of outer shell (excellently catalytic performance in electrocatalysis and chemical catalysis) and the cores of Au NPs (reaction process by in situ SERS monitoring).

Back to tab navigation

Supplementary files

Publication details

The article was received on 05 Sep 2018, accepted on 05 Nov 2018 and first published on 05 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR07224H
Citation: Nanoscale, 2018, Accepted Manuscript
  •   Request permissions

    pH-dependent Growth of Atomic Pd Layers on Trisoctahedral Gold Nanoparticles to Realize Enhanced Performance in Electrocatalysis and Chemical Catalysis

    Y. Song, C. Xiang, C. Bi, C. Wu, H. He, W. Du, L. Huang, H. Tian and H. Xia, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR07224H

Search articles by author

Spotlight

Advertisements