In this study, a simple and efficient electrochemical method was developed to prepare platinum (Pt) nanoparticles modified pencil graphite electrode (PGE) to use in direct methanol fuel cells. This method is based on two successive steps including the electrochemical pre-treatment of PGE via potential sweeping in the range of −1.0 V and +2.0 V and subsequent electrochemical plating of Pt nanoparticles in a wide potential range (+2.0 V: 1.0 V). Both the electrochemical pre-treatment of PGE and to use a wide potential range in the electrochemical Pt plating tremendously increased the effective surface area, the intensity of surface functional groups (hydroxyl, carbonyl, carboxyl, etc.), the electron transfer rate and the amount of Pt loading on the electrode surface, which greatly improved methanol electrooxidation activity of the electrode. The increase in the activity of the electrode reached to 16.3 times according to the classical Pt electroplating process. The electrodes were characterized by cyclic voltammetry, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy measurements. The stability of the electrodes was tested via cyclic voltammetry and chronoamperometry measurements. The electrochemical surface area of the electrode prepared here was calculated as 39.46 m^2 g-1, which was 39% higher than that of commercial Pt/C catalyst (28.4 m^2 g-1). The results showed that the proposed modification process can be seen as a simple and efficient alternative for the preparation of Pt-loaded carbon electrodes which can be used in direct methanol fuel cells.

在这项研究中，开发了一种简单有效的电化学方法来制备铂（Pt）纳米粒子修饰的铅笔状石墨电极（PGE），用于直接甲醇燃料电池。该方法基于两个连续步骤，包括通过在-1.0 V和+2.0 V范围内的电势扫描对PGE进行电化学预处理，以及随后在宽电势范围（+2.0 V：1.0 V）中对Pt纳米颗粒进行电化学电镀。PGE的电化学预处理和在Pt电镀中使用宽电位范围都极大地增加了有效表面积，表面官能团（羟基，羰基，羧基等）的强度，电子转移速率和电极表面上的Pt负载量大幅度提高了电极的甲醇电氧化活性。根据经典的Pt电镀工艺，电极活性的增加达到了16.3倍。通过循环伏安法，电化学阻抗谱，X射线光电子能谱和扫描电子显微镜测量来表征电极。通过循环伏安法和计时电流法测量来测试电极的稳定性。此处制备的电极的电化学表面积经计算为39.46 m 通过循环伏安法和计时电流法测量来测试电极的稳定性。此处制备的电极的电化学表面积经计算为39.46 m 通过循环伏安法和计时电流法测量来测试电极的稳定性。此处制备的电极的电化学表面积经计算为39.46 m^{2 g-1}，比商用Pt / C催化剂（28.4 m ^{2 g-1}）高39％。结果表明，所提出的改性工艺可以看作是制备可直接用于甲醇燃料电池的载有Pt的碳电极的简单有效的替代方法。