| Summary: | 碩士 === 國立雲林科技大學 === 材料科技研究所 === 102 === In this work, PtPdAu/graphene nanocomposites were synthesized from metal salt and graphite oxide (GO) by a two-step procedure. The first step is reduction of GO films by sodium tetrahydridoborate to obtain graphene. For the second step, a fixed weight of graphene oxide (GO) and variable weight of H2PtCl6•6H2O, Na2PdCl4•3H2O and HAuCl4•4H2O were put in ethylene glycol for a reflux at 130, 150, 170 oC for 3, 6, and 9 hours.
The Taguchi method was used to find the optimum parameters for optimizing the growth of PtPdAu/graphene nanocomposites. The electrocatalyticabilities of PtPdAu/graphene nanocomposites was evaluated by the electrochemically active surface area (ECSA). The nanocomposites (PtPdAu/graphene) were characterized by X-raydiffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) andX-ray photoelectronspectroscopy (XPS). The electrocatalytic characteristics of the PtPdAu/graphene nanocomposites were evaluated for the nonenzymatic oxidation of hydrogen peroxide (H2O2) and glucose by using cyclicvoltammetry and amperometry.
The results showed that the PtPdAu/graphene electrodes exhibited enhanced electrochemical properties and electrocatalytic performance toward the oxidation of hydrogen peroxide and glucose with remarkably high sensitivities. For hydrogen peroxide detection, amperometry indicates a short response time of 2s; two specific linear ranges of 1 mM-7 mM and 9 mM-30 mM, high sensitivities of 3104.51 μAmM-1cm-2 and 449.12μAmM-1cm-2, respectively; and a low detection limit of 0.01 μM. For glucose detection, amperometry indicates a shortresponse time of 4s; two specific linear ranges of 1 mM-9 mM and12 mM-20 mM, high sensitivities of 404.22 μAmM-1cm-2 and 106.96 μAmM-1cm-2, respectively; and a low detectionlimit of 0.02μM.
The PtPdAu/graphene nanocompositesalso exhibit superior toward the oxidation of hydrogen peroxide and glucose compared to Pt/graphene nanocomposites.
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