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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Process Parameters for Oxygen Plasma Activation of Carbon Nanofibers on the Characteristics of Deposited Platinum Nanoparticles as Electrocatalyst in Proton Exchange Membrane Fuel Cells
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Effect of Process Parameters for Oxygen Plasma Activation of Carbon Nanofibers on the Characteristics of Deposited Platinum Nanoparticles as Electrocatalyst in Proton Exchange Membrane Fuel Cells

机译：碳纳米纤维的氧等离子体活化工艺参数对质子交换膜燃料电池中电沉积铂纳米颗粒特性的影响

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摘要

In the polymer electrolyte membrane fuel cells (PEMFC) state of the art, rare and expensive platinumgroup metals (PGM) or PGM alloys are used as catalyst material. Reduction of PGMs in PEMFCelectrodes is strongly required to reach cost targets for this technology. An optimal catalyst utilizationis achieved in case of nano-structured particles supported on carbon material with a large specificsurface area. In this study, graphitic material, in form of carbon nanofibers (CNF), is decorated with Ptparticles, serving as catalyst material for PEMFC electrodes with low Pt loading. As a novelty, theeffect of oxygen plasma treatment of CNFs previously to platinum particle deposition has beenstudied. Electrodes are investigated in respect of the optimal morphology, microstructure as well aselectrochemical properties. Therefore, samples are characterized by means of scanning electronmicroscopy combined with energy dispersive X-ray analysis, transmission electron microscopy,thermogravimetry, X-ray diffraction as well as X-ray fluorescence analysis. In order to determine theelectrochemical active surface area of catalyst particles, cyclic voltammetry has been performed in 0.5M sulphuric acid. Selected samples have been investigated in a PEMFC test bench according to theirpolarization behavior.
机译：在现有技术的聚合物电解质膜燃料电池（PEMFC）中，稀有且昂贵的铂族金属（PGM）或PGM合金用作催化剂材料。为了达到这项技术的成本目标，强烈要求减少PEMFC电极中的PGM。在纳米结构颗粒负载在具有大比表面积的碳材料上的情况下，实现了最佳的催化剂利用率。在这项研究中，以碳纳米纤维（CNF）形式的石墨材料装饰有Pt颗粒，用作低Pt负载的PEMFC电极的催化剂材料。作为一种新颖性，已经研究了氧等离子处理CNF之前对铂颗粒沉积的影响。研究了电极的最佳形态，微观结构以及电化学性能。因此，样品通过扫描电子显微镜与能量色散X射线分析，透射电子显微镜，热重分析，X射线衍射以及X射线荧光分析相结合进行表征。为了确定催化剂颗粒的电化学活性表面积，已经在0.5M硫酸中进行了循环伏安法。所选样品已根据其极化行为在PEMFC测试台中进行了研究。

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