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首页> 外文期刊>Journal of power sources >Dependence of high-temperature PEM fuel cell performance on Nafion~R content
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Dependence of high-temperature PEM fuel cell performance on Nafion~R content

机译：高温PEM燃料电池性能对Nafion〜R含量的依赖性

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Operating a proton exchange membrane (PEM) fuel cell at elevated temperatures (above 100 deg C) has significant advantages, such as reduced CO poisoning, increased reaction rates, faster heat rejection, easier and more efficient water management and more useful waste heat. Catalyst materials and membrane electrode assembly (MEA) structure must be considered to improve PEM fuel cell performance. As one of the most important electrode design parameters, Nafion~R content was optimized in the high-temperature electrodes in order to achieve high performance. The effect of Nafion~R content on the electrode performance in H_2/air or H_2/O_2 operation was studied under three different operation conditions (cell temperature (degC)/anode ( percent RH)/cathode (percent RH)): 80/100/75, 100/70/70 and 120/35/35, all at atmospheric pressure. Different Nafion~R contents in the cathode catalyst layers, 15-40 wt percent, were evaluated. For electrodes with 0.5 mg cm~(-2) Pt loading, cell voltages of 0.70,0.68 and 0.60 V at a current density of 400 mA cm~(-2) were obtained at 35 wt percent Nafion~R ionomer loading, when the cells were operated at the three test conditions, respectively. Cyclic voltammetry was conducted to evaluate the electrochemical surface area. The experimental polarization curves were analyzed by Tafel slope, catalyst activity and diffusion capability to determine the influence of the Nafion~R loading, mainly associated with the cathode.
机译：在高温（高于100摄氏度）下运行质子交换膜（PEM）燃料电池具有显着的优势，例如，减少了CO中毒，提高了反应速率，更快地排热，更轻松，更有效的水管理和更多有用的废热。必须考虑使用催化剂材料和膜电极组件（MEA）结构来改善PEM燃料电池的性能。作为最重要的电极设计参数之一，Nafion〜R含量在高温电极中进行了优化，以实现高性能。在三种不同的操作条件（电池温度（摄氏度）/阳极（相对湿度）/阴极（相对湿度））下，研究了Nafion〜R含量对H_2 /空气或H_2 / O_2操作中电极性能的影响：80/100 / 75、100 / 70/70和120/35/35，都在大气压下。评价了阴极催化剂层中不同的Nafion R含量为15-40重量％。对于0.5 mg cm〜（-2）Pt负载的电极，当Nafion〜R离聚物负载为35 wt％时，在400 mA cm〜（-2）的电流密度下，电池电压为0.70、0.68和0.60 V.电池分别在三种测试条件下运行。进行循环伏安法以评估电化学表面积。通过Tafel斜率，催化剂活性和扩散能力来分析实验极化曲线，以确定主要与阴极有关的Nafion〜R负载的影响。

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