Fabrication of Trimetallic Pt−Pd−Co Porous Nanostructures on Reduced Graphene Oxide by Galvanic Replacement: Application to Electrocatalytic Oxidation of Ethylene Glycol,Electroanalysis

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Fabrication of Trimetallic Pt−Pd−Co Porous Nanostructures on Reduced Graphene Oxide by Galvanic Replacement: Application to Electrocatalytic Oxidation of Ethylene Glycol
Electroanalysis ( IF 2.7 ) Pub Date : 2017-09-06 , DOI: 10.1002/elan.201700355
Saeed Shahrokhian _{1,

2} , Sharifeh Rezaee ₁

Affiliation

In present work, reduced graphene oxide nanosheets (rGO) decorated with trimetallic three-dimensional (3D) Pt−Pd−Co porous nanostructures was fabricated on glassy carbon electrode (Pt−Pd−Co/rGO/GCE). First, GO suspension was drop-casted on the electrode surface, then GO film reduction was carried out by cycling the potential in negative direction to form the rGO film modified GCE (rGO/GCE). Then, electrodeposition of the cobalt nanoparticles (CoNPs) as sacrificial seeds was performed onto the rGO/GCE by using cyclic voltammetry. Afterward, Pt−Pd−Co 3D porous nanostructures fabrication occurs through galvanic replacement (GR) method based on a spontaneous redox process between PtCl2, PdCl2, and CoNPs. The morphology and structure of the Pt−Pd−Co/rGO porous nanostructure film was characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction method. The performance of the prepared electrode was investigated by various electrochemical methods including, cyclic voltammetry and electrochemical impedance spectroscopy. The electrocatalytic activity of the as-prepared modified electrode with high surface areas was evaluated in anodic oxidation of ethylene glycol. The study on electrocatalytic performances revealed that, in comparison to various metal combinations in modified electrodes, trimetallic Pt−Pd−Co/rGO/GCE exhibit a lower onset potential, significantly higher peak current density, high durability and stability for the anodic oxidation of ethylene glycol. The excellent performances are attributed to the rGO as catalysts support and resulting synergistic effects of the trimetallic and appropriate characteristics of the resulted 3D porous nanostructures. Moreover, the influence of various concentrations of ethylene glycol, the potential scan rate and switching potential on the electrode reaction, in addition, long-term stability have been studied by chronoamperometric and cyclic voltammetric methods.

中文翻译：

通过电置换在还原氧化石墨烯上制备三金属 Pt-Pd-Co 多孔纳米结构：在乙二醇电催化氧化中的应用

在目前的工作中，在玻璃碳电极（Pt-Pd-Co/rGO/GCE）上制造了用三金属三维（3D）Pt-Pd-Co多孔纳米结构装饰的还原氧化石墨烯纳米片（rGO）。首先，将GO悬浮液滴铸在电极表面，然后通过负向循环电位进行GO膜还原，形成rGO膜改性GCE（rGO/GCE）。然后，通过使用循环伏安法将钴纳米颗粒 (CoNPs) 作为牺牲种子电沉积到 rGO/GCE 上。之后，Pt-Pd-Co 3D 多孔纳米结构的制造通过基于 PtCl2、PdCl2 和 CoNPs 之间自发氧化还原过程的电流置换 (GR) 方法发生。Pt−Pd−Co/rGO 多孔纳米结构薄膜的形貌和结构通过扫描电子显微镜表征，能量色散光谱法和X射线衍射法。通过各种电化学方法，包括循环伏安法和电化学阻抗谱研究了所制备电极的性能。在乙二醇的阳极氧化中评估了所制备的具有高表面积的修饰电极的电催化活性。电催化性能研究表明，与修饰电极中的各种金属组合相比，三金属 Pt-Pd-Co/rGO/GCE 表现出较低的起始电位、显着较高的峰值电流密度、高耐久性和乙烯阳极氧化稳定性乙二醇。优异的性能归因于 rGO 作为催化剂载体以及所得 3D 多孔纳米结构的三金属和适当特性的协同效应。此外，还通过计时电流法和循环伏安法研究了各种乙二醇浓度、电位扫描速率和开关电位对电极反应的影响，以及长期稳定性。

更新日期：2017-09-06

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