A nonenzymatic electrochemical nitrite sensor based on Pt nanoparticles loaded Ni(OH)2/multi-walled carbon nanotubes nanocomposites

In this paper, a sensitive novel non-enzymatic nitrite electrochemical sensor based on Pt nanoparticles loaded Ni(OH) 2 /Multi-Walled Carbon Nanotubes nanocomposites (Pt/Ni(OH) 2 /MWCNTs) was described. The composition and morphology of the Pt/Ni(OH) 2 /MWCNTs were characterized by transmission electron microscope and investigated energy dispersive X-ray spectra respectively. Results showed that the Pt nanoparticles could be anchored on the surface of the Ni(OH) 2 /MWCNTs uniformly through a simple reduction process. The electrochemical investigation of the sensor revealed that the Pt/Ni(OH) 2 /MWCNTs exhibited remarkable electrocatalytic performance toward nitrite oxidation , with a sensitivity of 145   μA   mM −   1   cm −   2 and a low detection limit of 0.13   mM. Moreover, the obtained Pt/Ni(OH) 2 /MWCNTs modified GCE with excellent reproducibility and selectivity also allows for practical application. It is expected that the combination of noble metal with Ni(OH) 2 /MWCNTs could be expanded to enhance the catalytic performances of nanocomposites and used for the construction of high-sensitive electrochemical sensors.