Performance of membrane electrode assemblies based on proton exchange membranes prepared by pre-irradiation induced grafting
Performance of membrane electrode assemblies based on proton exchange membranes prepared by pre-irradiation induced grafting
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DOI：
10.1016/j.jpowsour.2006.04.100
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发表时间：
2006-10-20
影响因子：
9.2
通讯作者：
Washio, Masakazu
中科院分区：
文献类型：
--
作者：
Li, Jingye;Matsuura, Akio;Washio, Masakazu
将苯乙烯(S)或苯乙烯/二乙烯基苯（S/DVB）接枝到辐射交联聚四氟乙烯（RX-PTFE）薄膜上并磺化制备质子交换膜（PEMs）。制备的薄膜厚度小于20 μ m，离子交换容量（IEC）值约为2 meq g（-1）。在PEMs和碳电极表面涂覆Nafion (R)分散液，通过热压法制备膜电极组件（MEAs）。以Nation (R) 112膜为基础，用相同的方法制备了MEA进行比较。在不同的细胞温度和湿度条件下，测试了MEAs在单个细胞中的性能。在交流频率为100 kHz ~ 1 Hz，直流密度为0.5 a cm（-2）的条件下测量了电化学阻抗谱（EIS）。得到的奈奎斯特阻抗曲线为半圆形。(c) 2006 Elsevier B.V.版权所有
Proton exchange membranes (PEMs) were prepared by pre-irradiation induced grafting of styrene (S) or styrene/divinylbenzene (S/DVB) into the radiation-crosslinked polytetrafluoroethylene (RX-PTFE) films and then sulfonated. The thicknesses of the obtained PEMs were lower than 20 mu m and the ion exchange capacity (IEC) values were around 2 meq g(-1). The surfaces of the PEMs and carbon electrodes were coated with Nafion (R) dispersion, and then membrane electrode assembles (MEAs) were prepared by hot-pressing them together. A MEA based on a Nation (R) 112 membrane was also prepared under same procedure for comparison. The performances of the MEAs in a single cell were tested under different cell temperatures and humidifications. Electrochemical impedance spectra (EIS) were measured with ac frequencies which ranged from 100 kHz to 1 Hz at a dc density of 0.5 A cm(-2). The obtained impedance curves in Nyquist representation were semicircular. (c) 2006 Elsevier B.V. All rights reserved.