Observation of interface between Pt electrode and Nafion membrane
Observation of interface between Pt electrode and Nafion membrane
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Pt电极与Nafion膜界面的观察
DOI：
10.1149/1.1531970
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发表时间：
2003
影响因子：
3.9
通讯作者：
T. Umegaki
中科院分区：
文献类型：
--
作者：
K. Kanamura;H. Morikawa;T. Umegaki
利用原位傅里叶变换红外光谱（FTIR）和原子力显微镜（AFM）结合表面电位测量（SPoM），研究了Pt电极与Nafion膜之间界面的动态行为。Nafion膜由疏水和亲水结构域组成，两者都与Pt电极接触。当电解质滴在Nation膜上时，由于h2o的增加，界面区域变得更亲水。用原子力显微镜（AFM-SPoM）检测了膜表面的离子通道。离子通道的尺寸为40 ~ 100 nm。在10 × 10 μm的区域内观察到数十个通道。干燥Nafion膜的两个结构域的比值小于从FTIR测量中预期的湿Nafion膜。从这些结果可以看出，湿度极大地扩展了Nafion膜与Pt电极界面的电化学反应位点。这些结果显示了铂和离子交换聚合物之间界面的动态行为。
The dynamic behavior of the interface between a Pt electrode and a Nafion membrane has been demonstrated using in situ Fourier transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM) combined with surface potential measurement (SPoM). The Nafion membrane consists of hydrophobic and hydrophilic domains, both in contact with Pt electrodes. The interface region became more hydrophilic due to an increase of H 2 O when an electrolyte was dropped on the Nation membrane. Ion channels on the membrane surface were detected with AFM-SPoM. The size of the ion channels was 40-100 nm. Several tens of channels were observed in a 10 X 10 μm region. The ratio of two domains for the dry Nafion membrane was smaller than that for the wet Nafion membrane that was expected from the FTIR measurement. From these results, it can be said that an electrochemical reaction site at the interface between the Nafion membrane and the Pt electrode was extremely extended by humidity. These results exhibit a dynamic behavior of interfaces between Pt and ion-exchange polymer.