Effect of PTFE nanoparticles in catalyst layer with high Pt loading on PEM fuel cell performance
Effect of PTFE nanoparticles in catalyst layer with high Pt loading on PEM fuel cell performance
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DOI：
10.1016/j.ijhydene.2016.03.048
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发表时间：
2016-06-22
影响因子：
7.2
通讯作者：
Eroglu, Inci
中科院分区：
文献类型：
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作者：
Avcioglu, Gokce S.;Ficicilar, Berker;Eroglu, Inci
本研究将聚四氟乙烯（PTFE）加入到催化剂层结构中。该修饰旨在促进高Pt负载（1.2 mg/cm(2)）的阴极催化剂层中多余的水的去除。PTFE在催化剂油墨中的重量百分比从0到30%不等。采用超声喷涂技术，在含铂量为70%的碳催化剂上制备了膜电极组件。采用两种不同的膜电极组合结构对PEM燃料电池进行性能测试，以确定PTFE在正极和负极催化剂层结构中对水传输机理和电池性能的影响。在第一种结构（MEA1）中，将聚四氟乙烯纳米颗粒添加到阳极和阴极催化剂层中。在第二种构型（MEA2）中，PTFE纳米颗粒仅在阴极催化剂层上添加。PEM燃料电池试验在H-2/O-2和H-2/Air两种供气模式下进行。采用阻抗谱法进行电化学表征，研究了聚四氟乙烯纳米颗粒对反应动力学和传质的影响。5PTFE_AC催化剂层中的聚四氟乙烯纳米颗粒提供了中宏观疏水通道，与传统催化剂层相比，提供了更好的水管理。阴极催化剂层的高疏水性与高气流速率相结合，提高了水的反扩散速率，减少了阴极GDL的泛洪。(C) 2016氢能源出版有限责任公司，由爱思唯尔有限公司出版。版权所有。
In this study, Polytetrafluoroethylene (PTFE) was added to catalyst layer structure. This modification was aimed at facilitating excess water removal from the cathode catalyst layer with high Pt loading (1.2 mg/cm(2)). The weight percentage of PTFE in the catalyst inks varied from zero to 30. Membrane electrode assemblies were prepared with a commercial catalyst containing 70 wt % Pt on carbon, by ultrasonic spray coating technique. PEM fuel cell performance testing was carried out with two different membrane electrode assembly configuration in order to identify the effect of PTFE in anode and cathode catalyst layer structures on water transport mechanism and cell performance. In the first configuration (MEA1), PTFE nanoparticles were added to anode and cathode catalyst layers. In the second configuration (MEA2), PTFE nanoparticles were added only on cathode catalyst layer. PEM fuel cell tests were carried out at both H-2/O-2 and H-2/Air gas-feeding modes. Electrochemical characterization with impedance spectroscopy was carried out to investigate the influence of PTFE nanoparticles on reaction kinetics and mass transport. PTFE nanoparticles in catalyst layers of 5PTFE_AC provided meso-macro hydrophobic channeling, providing enhanced water management compared to conventional catalyst layers. Higher hydro-phobicity in cathode catalyst layer coupled with high airflow rate promotes increased back diffusion rate of water, diminishing flooding at cathode GDL. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.