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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrodepositing Pt by Modulated Pulse Current on a Nafion-Bonded Carbon Substrate as an Electrode for PEMFC
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Electrodepositing Pt by Modulated Pulse Current on a Nafion-Bonded Carbon Substrate as an Electrode for PEMFC

机译：在Nafion-bonded碳衬底上作为PEMFC的电极，通过调制脉冲电流对Pt进行电沉积

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摘要

Polymer electrolyte membrane fuel cell (PEMFC) electrodes were platinized by modulated pulse current electrodeposition. The aim of this study is to look for a way that keeps the advantages but circumvents the disadvantages of electrodeposting Pt for PEMFC electrodes. The capacitance effect of the double layer on the wave pattern of the pulse current was fully considered when choosing the current parameters. An uncatalyzed carbon electrode, on which a layer of Nafion-bonded carbon (NBC) was dispersed in advance, served as a substrate for electrodeposition. The platinized electrode by electrodeposition was assessed by the techniques of cyclic voltammetry, linear-sweep voltammetry, X-ray diffraction, transfer electron microscopy, and so on. The preliminary results show the following: (1) Pt deposition current efficiency in well-modulated pulse current electrodeposition has been markedly improved even to as high as 69.9% compared with 13% in the direct current electrodeposition. (2) It is difficult at the present time to get an electrode with high Pt loadings and good Pt dispersion by pulse electrodeposition because the hydrogen evolution is unavoidable. (3) It is uncertain for Pt deposition current efficiency even though the electrodeposition was conducted under the exact same technique because of the erratic generation and breaking of hydrogen bubbles.
机译：通过调制脉冲电流电沉积对高分子电解质膜燃料电池（PEMFC）电极进行镀铂处理。这项研究的目的是寻找一种保留PEMFC电极的Pt电极优点但避免其缺点的方法。选择电流参数时，要充分考虑双层对脉冲电流波形的电容效应。预先分散有Nafion键合的碳（NBC）层的未催化碳电极用作电沉积的基材。通过循环伏安法，线性扫描伏安法，X射线衍射，转移电子显微镜等技术对通过电沉积的镀铂电极进行了评估。初步结果表明：（1）调制好的脉冲电流电沉积中的Pt沉积电流效率已得到显着提高，与直流电沉积中的13％相比，甚至提高到69.9％。 （2）由于难以避免氢的释放，目前难以通过脉冲电沉积获得具有高的Pt负载和良好的Pt分散的电极。 （3）尽管由于完全不相同的电解沉积和氢气泡的产生和破裂，即使电沉积是在完全相同的技术下进行的，Pt沉积的电流效率也不确定。

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