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 language | English |
|---|---|
| Pages (from-to) | 1873-1877 |
| Number of pages | 5 |
| Journal | Electroanalysis |
| Volume | 31 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2019 Oct 1 |
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All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Electrochemistry
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Observed Dramatically Improved Catalysis of Ag Shell on Au/Ag Core-shell Nanorods is Due to Silver Impurities Released During Etching Process. / Krejcova, Ludmila; Novotny, Filip; Pumera, Martin.
In: Electroanalysis, Vol. 31, No. 10, 01.10.2019, p. 1873-1877.Research output: Contribution to journal › Article
TY - JOUR
T1 - Observed Dramatically Improved Catalysis of Ag Shell on Au/Ag Core-shell Nanorods is Due to Silver Impurities Released During Etching Process
AU - Krejcova, Ludmila
AU - Novotny, Filip
AU - Pumera, Martin
PY - 2019/10/1
Y1 - 2019/10/1
N2 - 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.
AB - 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.
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U2 - 10.1002/elan.201800668
DO - 10.1002/elan.201800668
M3 - Article
AN - SCOPUS:85073698751
VL - 31
SP - 1873
EP - 1877
JO - Electroanalysis
JF - Electroanalysis
SN - 1040-0397
IS - 10
ER -