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Dendrimer Templated Synthesis of Carbon Nanotube Supported PdAu Catalyst and its Application as Hydrogen Peroxide Sensor
Author(s) -
Alal Orhan,
Caglar Aykut,
Kivrak Hilal,
Sahin Ozlem
Publication year - 2019
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900140
Subject(s) - dendrimer , bimetallic strip , chronoamperometry , nanomaterial based catalyst , cyclic voltammetry , materials science , catalysis , carbon nanotube , detection limit , electrochemistry , electrochemical gas sensor , nanoparticle , selectivity , nanocomposite , chemical engineering , nanotechnology , electrode , chemistry , polymer chemistry , organic chemistry , chromatography , engineering
At present, CNT supported catalysts were prepared by two different methods as NaBH 4 reduction and dendrimer templated NaBH 4 reduction method to observe the effect of preparation method on the sensitivity and activity of H 2 O 2 reduction. Then, CNT supported Pd x Au y bimetallic nanocatalysts having various atomic ratio were synthesized via novel dendrimer templated NaBH 4 reduction method. The resulting materials were characterized employing XRD and TEM. Crystallite size of 10 %Pd 0.7 Au 0.3 /CNT dendrimer was obtained from XRD 17.1 nm and mean particle size obtained from TEM is about 15 nm. Moreover, the electrochemical behavior of these catalysts was characterized by cyclic voltammetry (CV) and chronoamperometry (CA) techniques. Pd x Au y bimetallic nanocatalysts have excellent electrocatalytic properties and great potential for applications in electrochemical detection. The sensitivity and the limit of detection values for the prepared sensor with monometallic 10 % Pd/CNT dendrimer catalysts are 219.78 μA mM −1 cm −2 and 2.6 μM, respectively. However, the sensor constructed with 10 %Pd 0.7 Au 0.3 /CNT dendrimer modified electrode has a very high sensitivity of 316.89 μA mM −1 cm −2 with a quick response time of 2 s and a wide linear range of 0.001–19.0 mM. In addition, the interference experiment indicated that the 10 % Pd 0.7 Au 0.3 /CNT dendrimer nanoparticles have good selectivity toward H 2 O 2 .