Three-phase interphase modeling of anode in membrane electrode assembly using a porous microelectrode
Three-phase interphase modeling of anode in membrane electrode assembly using a porous microelectrode
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DOI：
10.1016/j.ijhydene.2015.01.127
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发表时间：
2015-04
影响因子：
7.2
通讯作者：
Weiqi Zhang;S. Shironita;M. Umeda
中科院分区：
文献类型：
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作者：
Weiqi Zhang;S. Shironita;M. Umeda
采用电化学阻抗谱（EIS）和多孔微电极（PME）相结合的方法研究了降解前后模拟三相界面上的氢氧化反应（HOR）。将碳载Pt催化剂和Nafion填充的PME（电极-1）的粉末混合物建模为非降解的三相界面。另一方面，炭黑和Nafion填充的Pt电镀的PME（电极-2）的粉末混合物建模为退化的三相界面。电极-1显示出比电极-2更高的HOR活性。基于EIS结果，当与电极-1相比时，电极-2的电荷传递和质量传递电阻均显著增加，表明降解模型的三相界面上的HOR活性受到抑制。也就是说，在劣化的三相界面上，电荷传递和质量传递受到阻碍。
In this study, the hydrogen oxidation reaction (HOR) at the modeled three-phase interfaces of before and after degradation was investigated by combining electrochemical impedance spectroscopy (EIS) and porous microelectrode (PME) techniques. The powder mixture of a carbon-supported Pt catalyst and Nafion-packed PME (Electrode-1) was modeled as a non-degraded three-phase interface. On the other hand, the powder mixture of carbon black and Nafion-packed Pt electroplated PME (Electrode-2) modeled as a degraded three-phase interface. Electrode-1 showed a higher HOR activity than Electrode-2. Based on the EIS result, when compared to Electrode-1, both the charge transfer and mass transfer resistances of Electrode-2 significantly increased, suggesting a suppression of the HOR activity on the three-phase interface of the degraded model. That is, the charge transfer and mass transfer are hindered on the degraded three-phase interface.