Observed Dramatically Improved Catalysis of Ag Shell on Au/Ag Core-shell Nanorods is Due to Silver Impurities Released During Etching Process

Ludmila Krejcova, Filip Novotny, Martin Pumera

Research output: Contribution to journalArticle

Abstract

Core/shell bimetallic nanoparticles are highly popular in electrocatalysis; it is argued that the core metal enhances the catalytic properties of the shell. We have investigated the electrocatalytic properties of Au/Ag core-shell nanorods (Au/Ag NRs) where Ag shell was thinned by aging in the presence of cetyltrimethylammonium bromide. We observed excellent electrocatalysis toward hydrogen peroxide electroreduction upon decreasing the Ag shell thickness, which would, at first, appear to imply a strong synergistic effect of the Au core with the Ag shell for electrocatalysis. We show, however, that this electrocatalysis is not caused by particular Au/Ag core/shell structures but rather by the presence of residual silver impurities in the form of Ag nanoparticles (Ag NPs) formed during the preparation of the thin-layer silver shell/gold core nanorods.

Original languageEnglish
Pages (from-to)1873-1877
Number of pages5
JournalElectroanalysis
Volume31
Issue number10
DOIs
Publication statusPublished - 2019 Oct 1

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Electrochemistry

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