Au-Pt纳米颗粒/石墨烯-纤维素微纤维复合电极的制备与电化学性能

石墨烯和金属纳米是优异的导电纳米材料，为构建具有高效活性表面积的电化学传感界面，以玻碳电极作为导电基底，采用滴涂法结合一步电沉积成功制备了Au-Pt纳米颗粒/还原氧化石墨烯-纤维素微纤维(Au-Pt NPs/RGO-CMF)复合材料。SEM、原子力显微镜(AFM)、EDS和拉曼光谱分析表明，Au-Pt纳米颗粒均匀分布在RGO-CMF的薄层上，同时实现了氧化石墨烯(GO)还原为RGO。以铁氰化钾作为氧化还原探针对界面的电化学性质进行研究，在优化的实验条件下(循环伏安法电沉积:电位为?1.2~0 V，周期为20，电解质pH值为6，滴涂GO-CMF体积为8 μL)，得到Au-Pt NPs/RGO-CMF复合材料的高效活性表面积(3.54 cm2)远远优于裸玻碳电极(1.52 cm2)。表明构建界面具有高的电催化活性，为传感器的进一步应用提供理论支持。 

Preparation and electrochemical performance of Au-Pt nanoparticles/graphene-cellulose microfiber composite electrodes

The graphene and metal nano-materials are excellent conductive nanomaterials. In order to construct an electrochemical sensing interface with high-efficiency active surface area, glassy carbon electrode was used as a conductive substrate, and Au-Pt nano particles/reduced graphene oxide-cellulose microfiber (Au-Pt NPs/RGO-CMF) composites were successfully prepared by drip coating combined with one-step electrodeposition. The SEM, atomic force microscopy (AFM), EDS and Raman spectroscopy analysis show that Au-Pt nanoparticles are uniformly distributed on the thin layer of RGO-CMF, and at the same time, graphene oxide (GO) reduce to RGO. Using potassium ferricyanide as a redox probe to study the electrochemical properties of the interface, under optimized experimental conditions (cyclic voltammetry electrodeposition: Potential is ?1.2-0 V, period is 20, electrolyte pH value is 6, drops coated GO-CMF volume is 8 μL), the high-efficiency active surface area of Au-Pt NPs/RGO-CMF composites (3.54 cm2) is much better than that of bare glassy carbon electrode (1.52 cm2). It shows that the constructed interface has high electrocatalytic activity, which provides theoretical support for the further application of the sensor.