Journal
TALANTA
Volume 165, Issue -, Pages 304-312Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2016.12.067
Keywords
Electrochemical sensor; Nitrogen-doped graphene; Palladium nanocubes; Electrocatalysis; Nitrite
Categories
Funding
- National Science Fund of China [21275116, 21575113]
- Specialized Research Fund for the Doctoral Program of Higher Education [20126101110013]
- Natural Science Fund of Shaanxi Province in China [2013KJXX-25]
- Scientific Research Foundation of Shaanxi Provincial Key Laboratory [14JS094, 15JS100, 16JS099]
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A nanocomposite of high-quality palladium nanocubes (PdNCs) decorated nitrogen-doped graphene (NGE/PdNC) was successfully prepared by using bromide ion as a capping agent and polyvinyl pyrrolidone as a stabilizer. The morphology and composition of NGE/PdNC nanocomposites were characterized by field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD) and Raman spectra. To explore the application of NGE/PdNC nanocomposites in electrochemistry, the electrocatalytic response to nitrite at a NGE/PdNC-based electrode was investigated. Thus, a highly sensitive and selective electrochemical sensor for the detection of nitrite was constructed based on a glassy carbon electrode modified with the NGE/PdNC nanocomposites. The electrochemical behavior of this nanocomposites was studied by electrochemical impedance spectroscopy, cyclic voltammetry and chronoamperometry. The electrochemical investigations proved that the NGE/PdNC nanocomposites exhibited good electrocatalytic performance for the oxidation of nitrite, including a wide linear range from 5.0x10(-7) to 1.51x10(-3) mol L-1, a high sensitivity of 342.4 mu A mM(-1) cm(-2) and a low detection limit of 0.11 mu mol L-1 at the signal-to-noise ratio of 3 (S/N=3). This non-enzymatic sensor also showed a good reproducibility and stability. The obtained NGE/PdNC nanocomposites may be a potential composite for applying in the field of other electrochemical sensing, catalysis and optics.
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