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首页> 外文期刊>International Journal of Electrochemical Science >Electrodeposited ZnO@three-dimensional Graphene Composite Modified Electrode for Electrochemistry and Electrocatalysis of Myoglobin
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Electrodeposited ZnO@three-dimensional Graphene Composite Modified Electrode for Electrochemistry and Electrocatalysis of Myoglobin

机译：电沉积ZnO @三维石墨烯复合修饰电极用于肌红蛋白的电化学和电催化

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摘要

A three-dimensional graphene (3DGR) was electrodeposited on carbon ionic liquid electrode (CILE) and further decorated with electrodeposited zinc oxide (ZnO) to get a ZnO@3DGR hybrid composite. Then myoglobin (Mb) was immobilized on the surface of ZnO@3DGR modified electrode with Nafion to prepare the biosensor named as Nafion/Mb/ZnO@3DGR/CILE. On cyclic voltammogram a pair of well-defined redox responses resulted from the electron transfer of Mb with the working electrode was got, which could be ascribed to the specific characteristics of ZnO@3DGR including porous macrostructure, biocompatibility, high conductivity and big surface area. Electrochemical parameters including the electron transfer coefficient (α) and the apparent heterogeneous electron -1 transfer rate constant (ks) were got by electrochemical methods with the values as 0.31 and 0.76 s . This biosensor showed excellent electrocatalysis to the electro reduction of trichloroacetic acid (TCA). A good linear relationship between the catalytic reduction peak current and TCA concentration was in the range from 0.5 to 30.0 mmol L-1 and the detection limit was 0.167 mmol L-1 (3σ). The results indicated that a third-generation electrochemical Mb biosensor with ZnO@3DGR/CILE was prepared and exhibited good stability with reproducibility.
机译：将三维石墨烯（3DGR）电沉积在碳离子液体电极（CILE）上，再用电沉积的氧化锌（ZnO）装饰，得到ZnO @ 3DGR杂化复合材料。然后用Nafion将肌红蛋白（Mb）固定在ZnO @ 3DGR修饰的电极表面，制备出名为Nafion / Mb / ZnO @ 3DGR / CILE的生物传感器。在循环伏安图上，得到了一对由Mb与工作电极的电子转移引起的明确定义的氧化还原响应，这可以归因于ZnO @ 3DGR的特定特征，包括多孔宏观结构，生物相容性，高电导率和大表面积。通过电化学方法得到了包括电子传递系数（α）和表观非均质电子-1传递速率常数（ks）在内的电化学参数，其值分别为0.31和0.76 s。该生物传感器对三氯乙酸（TCA）的电还原表现出出色的电催化作用。催化还原峰电流与TCA浓度之间的良好线性关系在0.5至30.0 mmol L-1之间，检出限为0.167 mmol L-1（3σ）。结果表明，制备了具有ZnO @ 3DGR / CILE的第三代电化学Mb生物传感器，并具有良好的稳定性和可重复性。

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