Morphology of ZnO nanoparticles bound to carbon nanotubes affects electrocatalytic oxidation of phenolic compounds
作者： Poliana G. Freire , Rodrigo H.O. Montes , Fernanda C. Romeiro , Samantha C.S. Lemos , Renata C. Lima
DOI: 10.1016/J.SNB.2015.09.086
关键词: Carbon nanotube 、 Hydroquinone 、 Nanotechnology 、 Nanoparticle 、 Electrochemistry 、 Cyclic voltammetry 、 Dielectric spectroscopy 、 Electrocatalyst 、 Electrode 、 Chemical engineering 、 Materials science
摘要: Abstract The electrocatalytic activity of ZnO nanoparticles attached to carboxylic acid functionalized multi-walled carbon nanotubes (MWCNTs) was investigated controlling the morphology and size hydrothermally synthesized. A strong dependence on nanosized shape toward electrochemical oxidation dopamine, hydroquinone, tert-butylhydroquinone is demonstrated. High verified for all phenolic molecules when were produced at 120 °C 120 min, which resulted in flower-shape nanoparticles. Two other procedures production evaluated using microwave hydrothermal method spherical non-uniform cyclic voltammetry experiments Britton–Robinson buffer revealed that composite ZnO/MWCNT provided intense (around 4-fold) increase current decrease peak-to-peak separation three comparison with composites MWCNT-modified electrodes. Improved performance this sensor agreement impedance spectroscopy measurements. Amperometric measurements also improved (superior sensitivity).
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