Enhanced performance of 3D printed graphene electrodes after electrochemical pre-treatment: Role of exposed graphene sheets
Enhanced performance of 3D printed graphene electrodes after electrochemical pre-treatment: Role of exposed graphene sheets
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DOI：
10.1016/j.snb.2018.11.013
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发表时间：
2019-02-15
影响因子：
8.4
通讯作者：
Bonacin, Juliano A.
中科院分区：
文献类型：
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作者：
dos Santos, Pamyla L.;Katic, Vera;Bonacin, Juliano A.
据报道，3D 打印是电化学设备开发的一项卓越技术，因为它没有设计限制、废物最小化，而且最重要的是可以快速原型制作。将 3D 打印电极用于电分析应用仍然是一项挑战，需要付出努力。在这项工作中，我们开发了低成本且可重复的 3D 打印石墨烯电极，用于多巴胺的电催化检测。经过电化学预处理后，电催化性能得到增强。在0.1 mol L-1磷酸盐缓冲溶液（pH = 7.4）中，不同电位范围内的氧化和还原用于调节电极的结构和形态特征。因为，电极的电化学性能，包括电子转移动力学和电催化活性，受到电子性能和官能团存在的强烈影响。使用拉曼光谱、SEM 和 AFM 显微镜以及电化学技术对电化学预处理前后的 3D 电极进行表征。最后，评估了 3D 打印石墨烯电极的多巴胺传感性能。最佳性能是通过在 + 1.8 V vs. SCE 下氧化 900 s，并在 50 mV s(-1) 下从 0.0 V 降低到 -1.8 V vs. SCE 来实现的。该传感器在2.0 μ mol L-1至10.0 μ mol L-1范围内呈现线性响应，检测限为0.24 μ mol L-1。
3D printing has been reported as a remarkable technology for development of electrochemical devices, due to no design constraints, waste minimization and, most importantly, fast prototyping. The use of 3D printed electrodes for electroanalytical applications is still a challenge and demand efforts. In this work, we have developed low-cost and reproducible 3D-printed graphene electrodes for electrocatalytic detection of dopamine. Electrocatalytic features were enhanced after electrochemical pre-treatment. The oxidation and reduction at different potential ranges, in 0.1 mol L-1 phosphate buffer solution (pH = 7.4), are used to modulate the structural and morphological characteristics of the electrodes. Since, the electrochemical properties of the electrodes, including electron transfer kinetic and the electrocatalytic activity, are strongly influenced by electronic properties and the presence of functional groups. Raman spectroscopy, SEM and AFM microscopes and electrochemical techniques were used to characterize the 3D electrodes before and after the electrochemical pre-treatments. Finally, the performances of the 3D-printed graphene electrodes were evaluated towards dopamine sensing. The best performance was achieved by oxidation at + 1.8 V vs. SCE for 900 s and reduction from 0.0 V to -1.8 V vs. SCE at 50 mV s(-1). The proposed sensor presented linear response from 2.0 mu mol L-1 to 10.0 mu mol L-1, with detection limit of 0.24 mu mol L-1.