| Summary: | 碩士 === 國立臺北科技大學 === 化學工程研究所 === 104 === In this work, we used metal nanoparticles with metalloporphyrins decorated reduced graphene oxide composite modified electrode for the electrocatalytic reaction. Considering the nanoparticles, we used that a single step electrochemical fabrication of a PtNPs decorated RGO (RGO-PtNPs) composite for enhanced electrochemical sensing of H2O2 .The fabricated composite modified electrode was further characterized by CV and amperometry methods (i-t) .The amperometric response of the RGO–PtNPs composite modified electrode for the reduction of H2O2 was linear over the concentration ranging from 0.05 μM to 750.6 μM with the limit of detection of 0.016 μM. The sensitivity of the sensor was calculated as 0.686 ±0.072 μM mM-1 cm-2. On the other hand, the metalloporphyrins decorated RGO for the application. RGO supported Mn-TPP nanocomposite was electrochemically synthesized and used for the highly selective and sensitive detection of DA. Besides, the prepared RGO/Mn-TPP nanocomposite modified electrode exhibited an enhanced electrochemical response to DA with less oxidation potential and enhanced response current. The working linear range of the electrode was observed from 0.3 μM - 188.8 μM, the limit of detection was 0.008 μM and the sensitivity was 2.606 μA μM-1 cm-2. In addition, we also reported the preparation and catalytic properties of RGO/Pd-TPP composite modified electrode. The ORR was studied by CV, and LSV. The modified nanocomposite was compared with the commercially purchased Pt/C electrode and shows that the current density was higher than that of the Pt/C electrode with less methanol hindrance. In addition, the prepared composite modified electrode was characterized by the SEM, EIS, NMR, UV, XRD, Infrared Spectroscopic and elemental analysis.
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