Synthesis of Pd/PEI-GNs Composites as Electrocatalyst for Reduction of p-Nitrophenol†

doi:10.7503/cjcu20160338

Abstract

Abstract:

Pd/PEI-GNs composites were prepared by the electrochemical deposition technique with poly(ethyleneimine) functionalized graphene(PEI-GNs) as the support. The as-prepared composites were characterized by FTIR, XRD, XPS and SEM. The results showed that Pd/PEI-GNs composites were prepared and Pd particles were uniformly dispersed on the PEI-GNs support. Cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and chronoamperometric curves were used to investigate the electrocatalytic activities of the Pd/PEI-GNs composites. The results indicated that the as-prepared composites presented better electrocatalytic activity and stability towards p-nitrophenol reduction. The enhancement in electrochemical performance of the Pd/PEI-GNs composites can be attributed to the synergistic effect of highly dispersed Pd nanoparticles on the PEI-GNs and higher electron transfer of PEI-GNs.

Key words: Graphene, Pd nanoparticles, p-Nitrophenol, Electrocatalyzed reduction

CLC Number:

O646

TrendMD:

LUO Minghong, XIA Kejian, ZHOU Guanghua, GE Wen. Synthesis of Pd/PEI-GNs Composites as Electrocatalyst for Reduction of p-Nitrophenol^†[J]. Chem. J. Chinese Universities, 2016, 37(12): 2268.

Figures/Tables 10

Fig.1 FTIR spectra of GO(a) and PEI-GNs(b)

Fig.2 XRD patterns of Pd/PEI-GNs(a) and PEI-GNs(b)

Fig.3 XPS spectra of Pd/PEI-GNs(A) Full spectrum; (B) C1s spectrum; (C) N1s spectrum; (D) Pd3d spectrum.

Fig.4 SEM images of the Pd electrodeposited on different electrode surfaces(A), (B) Bare ITO; (C), (D) PEI-GNs/ITO.

Fig.5 Cyclic voltammograms of Pd/PEI-GNs/GC(a) and Pd/GC(b) in 0.5 mol/L H2SO4 solutionScan rate: 50 mV/s.

Fig.6 Cyclic voltammograms of Pd/GC electrode in 0.2 mol/L PBS(pH=7.0)(a), Pd /GC(b), Pd/PMo12/GC(c) and Pd/PEI-GNs/GC(d) in 5 mmol/L p-nitrophenol +0.2 mol/L PBS(pH=7.0) Scan rate: 50 mV/s.

Fig.7 Nyquist plots of Pd/PEI-GNs/GC(a) and Pd/GC(b) in 5 mmol/L p-nitrophenol+0.2 mol/L PBS(pH=7.0)

Fig.8 Linear sweep voltammograms of Pd/PEI-GNs/GC electrode at various scan rates in 5 mmol/L p-nitrophenol+0.2 mol/L PBS(pH=7.0)From a to j, the scan rates are 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 mV/s. The inset shows the relationship between the reduction peak current and the square of the scan rates.

Fig.9 Linear sweep voltammograms of Pd/PEI-GNs/GC electrode in different concentrations of p-nitrophenol in 0.2 mol/L PBS(pH=7.0)From a to g, the concentrations of p-nitrophenol are 0.2, 0.4, 0.6, 0.8, 1.0, 2.0, 3.0 mmol/L, respectively. The inset shows the reduction peak current as a function of the concentration of p-nitrophenol. Scan rate: 50 mV/s.

Fig.10 Chronoamperometric curves of Pd/PEI-GNs/GC(a) and Pd/GC(b) in 5 mmol/L p-nitrophenol+0.2 mol/L PBS(pH=7.0) at -0.5 V for 600 s

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