Effect of anion functional groups on the conductivity and performance of anion exchange polymer membrane fuel cells
Effect of anion functional groups on the conductivity and performance of anion exchange polymer membrane fuel cells
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DOI：
10.1016/j.jpowsour.2012.03.100
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发表时间：
2012-08
影响因子：
9.2
通讯作者：
M. Mamlouk;K. Scott
中科院分区：
文献类型：
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作者：
M. Mamlouk;K. Scott
研究了阴离子官能团对碱性阴离子交换膜燃料电池（aaemfc）电导率和性能的影响。从离子电导率和分离的阳极、阴极和电池性能方面对膜和离聚体进行了表征。TMA功能化（LDPE-co-VBC）或PVBC在各种胺/硫基官能团中提供最高的电导率，电导率值高达0.25（平面）和0.043Scm - 1（平面）。与胺基基团相比，硫化物基基团对温度的稳定性较低。与氮或硫相连的芳基链的长度增加导致电导率降低。TMA功能化膜具有较高的OH -导电性，其活化能较低，仅为12kJmol−1；接近报道的H+电导率值。离子官能团影响氧的透性、活化能和氧还原的交换电流密度。TMA功能化离聚体为氧还原反应提供了一种改进的介质，其交换电流密度比DMS高约300倍。阳极淹水似乎严重限制了电池的性能，这是由用于离聚体的官能团类型决定的。TMA功能化电极表现出优异的电池性能，在0.6V时电流密度为0.722Acm−2，峰值功率密度为478mWcm−2。
A study of the effect of anion functional group on the conductivity and performance of alkaline anion exchange membrane fuel cells (AAEMFCs) is reported. Membranes and ionomer were characterised in terms of ionic conductivity and separate anode, cathode and cell performances. TMA functionalised (LDPE-co-VBC) or PVBC offered the highest conductivity amongst the various selections of amine/sulphide-based functional groups with conductivities values up to 0.25 (in plane) and 0.043Scm−1(through plane). Sulphide-based groups showed lower stability with temperature in comparison to amine-based groups. The increase in length of the chain in the aryl group attached to the nitrogen or sulphur led to lower conductivity. The high OH−conductivity in membranes functionalised with TMA is reflected by its low activation energy of 12kJmol−1;close to the reported value for H+conductivity in Nafion. The ionomer functional groups affected oxygen permeability, the activation energy and the exchange current density for oxygen reduction. TMA functionalised ionomer provided an improved medium for the oxygen reduction reaction with exchange current density some 300 times higher than that with DMS. Anode flooding appeared to severely restrict cell performance and was determined by the type of functional group used for the ionomer. TMA functionalized electrodes showed superior cell performance with a current density of 0.722Acm−2at 0.6V and a peak power density of 478mWcm−2.