High durable poly(vinyl alcohol)/Quaterized hydroxyethylcellulose ethoxylate anion exchange membranes for direct methanol alkaline fuel cells
High durable poly(vinyl alcohol)/Quaterized hydroxyethylcellulose ethoxylate anion exchange membranes for direct methanol alkaline fuel cells
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用于直接甲醇碱性燃料电池的高耐用聚乙烯醇/季化羟乙基纤维素乙氧基化物阴离子交换膜
DOI：
10.1016/j.jpowsour.2012.11.041
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发表时间：
2013-04
期刊：
影响因子：
--
通讯作者：
Yuyu Liu
中科院分区：
文献类型：
--
作者：
Lingling Liu;Gaopeng Jiang;Jing Zhang;Yuyu Liu
制备了化学交联聚乙烯醇改性季铵化羟乙基纤维素乙氧基酸酯（PVA/ qheece）的新型碱性阴离子交换膜。测定了PVA/ qheece膜的氢氧化物电导率（σOH−）、水和甲醇吸收量、离子交换容量（IEC）、力学性能、尺寸和碱性稳定性，以评价其在直接甲醇碱性燃料电池（DMAFC）中的适用性。采用交流阻抗技术研究了交联时间、膜组成和催化剂H+用量对膜OH−电导率的影响。利用红外光谱、扫描电镜和热重分析对膜进行了结构表征。发现膜的OH -电导率随温度升高而升高，在90℃时达到7.5 × 10 - 3S cm - 1，但吸水性和甲醇吸收率随温度变化不明显。在25℃时，膜的甲醇渗透系数为1.26 ~ 1.72 × 10−7cm2s−1。此外，PVA/ qheece膜在80°C高温6.0 M KOH中表现出很高的碱性稳定性，在一周的评估中没有失去其完整性和OH -导电性。以PVA/ qheece（质量= 1:0.25）制备的膜电极组件（MEA）在室温下，以2.0 M甲醇和2.0 M KOH为燃料，o2为氧化剂，初始功率密度为4.6 mW cm - 2。
Novel alkaline anion-exchange membranes composed of chemically cross-linked poly(vinyl alcohol) modified quaternized hydroxyethylcellulose ethoxylate (PVA/QHECE) are prepared. The hydroxide conductivity (σOH−), water and methanol uptakes, ion exchange capacity (IEC), mechanical property, dimensional and alkaline stabilities of PVA/QHECE membranes are measured to evaluate their applicability in direct methanol alkaline fuel cells (DMAFC). The effects of cross-linking time, membrane composition and catalyst dosage (H+) on membrane OH−conductivity are studied using AC impedance technique. FTIR, SEM and TG analysis are used for structural characterization of these membranes. It is found that the OH−conductivity of the membranes increases with temperature and reaches up to 7.5 × 10−3S cm−1at 90 °C but no apparent changes on both water uptake and methanol uptake with temperature. The methanol permeability coefficients of the membranes are in the range of 1.26–1.72 × 10−7cm2s−1at 25 °C. In addition, the PVA/QHECE membranes show the high alkaline stability in hot 6.0 M KOH at 80 °C without losing their integrity and OH−conductivity during a week of evaluation. The membrane electrode assembly (MEA) fabricated with PVA/QHECE (= 1:0.25 by mass) gives an initial power density of 4.6 mW cm−2using 2.0 M methanol and 2.0 M KOH as the fuel and O2as oxidant at room temperature.
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