Sulfonated graphene oxide/Nafion composite membranes for high-performance direct methanol fuel cells
Sulfonated graphene oxide/Nafion composite membranes for high-performance direct methanol fuel cells
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DOI：
10.1016/j.ijhydene.2013.08.036
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发表时间：
2013-10-17
影响因子：
7.2
通讯作者：
Chang, Feng-Chih
中科院分区：
文献类型：
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作者：
Chien, Hung-Chung;Tsai, Li-Duan;Chang, Feng-Chih
通过将磺化氧化石墨烯（SGO）分散到Nafion基质中，开发了一种简单有效的制备低甲醇渗透膜的方法。具有低SGO含量的SGO/Nafion混合物表现出独特的粘度行为，并允许在Nafion内更好地分散SGO。铸膜后，复合膜表现出较低的甲醇和水的吸收，降低的溶胀比，在低相对湿度下改善的质子传导率，和极高的甲醇选择性，这可以在直接甲醇燃料电池（DMFC）中实现。复合膜的规则骨架显示出更高的储能模量、增加的α-弛豫（转变温度）和膜电极组件（MEA）期间改善的压力耐受性。小角X射线光谱表明复合膜中离子簇的收缩，从而减少甲醇渗透。应用于DMFC的杂化膜在1 M和5 M甲醇溶液中表现出优于商业Nafion 115的性能上级。版权所有（C）2013，氢能出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
An easy and effective method for producing low methanol-crossover membranes is developed by dispersing sulfonated graphene oxide (SGO) into a Nafion matrix. A SGO/Nafion mixture with low SGO content exhibits unique viscosity behavior and allows for better SGO dispersion within the Nafion. After film casting, the composite membranes show lower methanol and water uptakes, a reduced swelling ratio, improved proton conductivity in low relative humidity, and extremely high methanol selectivity, which can be implemented in direct methanol fuel cells (DMFCs). The regular backbone of the composite membrane shows a higher storage modulus, increased a-relaxation (transition temperature), and improved tolerance to pressure during membrane electrode assembly (MEA). The small angle X-ray spectra indicate the shrinkage of the ionic clusters in the composite membranes, which thus reduce methanol crossover. The hybrid membranes applied to DMFCs demonstrate performances superior to that of the commercial Nafion 115 in 1 M and 5 M methanol solutions. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.