Pd/PEI-GNs复合材料的制备及对对硝基苯酚的电催化还原性能

doi:10.7503/cjcu20160338

摘要/Abstract

摘要：

以聚乙烯亚胺(PEI)功能化的石墨烯(PEI-GNs)为载体, 利用电化学还原法制备了Pd/PEI-GNs复合物. 采用红外光谱仪、 X射线光电子能谱仪、 X射线粉末衍射仪和扫描电子显微镜等对复合物的组成、结构和形态进行了表征. 结果表明, Pd/PEI-GNs复合物中Pd颗粒均匀分散在PEI-GNs基底上. 采用循环伏安法、交流阻抗法和计时电流法等电化学方法研究了Pd/PEI-GNs复合物的电化学性能. 结果表明, 制备的复合物催化剂对对硝基苯酚还原具有较好的催化活性和稳定性, 这主要是由于Pd纳米颗粒在PEI-GNs载体上均匀分散以及PEI-GNs优异的电子传递能力.

关键词: 石墨烯, 钯纳米粒子, 对硝基苯酚, 电催化还原

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

中图分类号:

O646

TrendMD:

罗明洪, 夏克坚, 周光华, 葛文. Pd/PEI-GNs复合材料的制备及对对硝基苯酚的电催化还原性能. 高等学校化学学报, 2016, 37(12): 2268.

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

图/表 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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