Observed Dramatically Improved Catalysis of Ag Shell on Au/Ag Core‐shell Nanorods is Due to Silver Impurities Released During Etching Process. Issue 10 (5th December 2018)

• Record Type: Journal Article
• Authors: Krejcova, Ludmila; Novotny, Filip; Pumera, Martin
• Is Part Of: Electroanalysis. Volume 31:Issue 10(2019)
• Page Start: 1873
• Page End: 1877
• Publication Date: 2018-12-05
• Subjects: bimetallic particles -- Au/Ag nanorods -- varied shell thickness -- physicochemical transformation -- hydrogen peroxide catalyst; Electrochemical analysis -- Periodicals; Chemistry, Analytical -- Periodicals; Electrochemistry -- Periodicals; 543.4
• DOI: 10.1002/elan.201800668
• Languages: English
• ISSNs: 1040-0397

Abstract

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. Abstract :