Plasma‐Polymerized Membranes with High Proton Conductivity for a Micro Semi‐Passive Direct Methanol Fuel Cell
Plasma‐Polymerized Membranes with High Proton Conductivity for a Micro Semi‐Passive Direct Methanol Fuel Cell
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DOI：
10.1002/ppap.201500113
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发表时间：
2016
影响因子：
3.5
通讯作者：
Zhongqing Jiang;Zhongqing Jiang
中科院分区：
文献类型：
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作者：
Zhongqing Jiang;Zhongqing Jiang
以苯乙烯、三氟甲烷磺酸和苯磺酰氟为单体，采用脉冲等离子体放电技术合成了质子交换膜。结果表明，苯磺酰氟的存在可以降低单体的等离子体放电破碎程度和酸基对聚合物或膜的烧蚀程度。据报道，与仅使用苯乙烯和三氟甲烷磺酸作为单体和商业化的Nafion 117合成的膜相比，制备的膜具有高比例的磺酸基团，具有更高的离子交换能力，吸水率，质子电导率和更低的质子传导激活势垒和甲醇渗透性。电化学结果表明，与以苯乙烯和三氟甲烷磺酸为单体制备的膜和以Nafion 117为单体制备的膜相比，用该膜组装的微型半被动直接甲醇燃料电池（μsp- dmfc）具有更高的电化学性能。稳定性测试还表明，用该膜组装的μsp- dmfc的电化学性能比用Nafion 117组装的μsp- dmfc的电化学性能更稳定。这些结果清楚地证明了使用这种膜作为PEMs来改善燃料电池的电化学性能的巨大潜力。
A proton exchange membrane has been synthesized by a pulsed plasma discharge technique using styrene, trifluoromethane sulfonic acid, and benzenesulfonyl fluoride as the monomers. It shows that the presence of benzenesulfonyl fluoride could reduce the degree of the fragmentation of the monomers by plasma discharge and the ablation of polymers or membranes by acid groups. The fabricated membrane is reported to have a high percentage of sulfonic acid groups and exhibits higher ion exchange capacity, water uptake, and proton conductivity and lower activation barrier for proton conduction and methanol permeability in comparison to the membranes synthesized with only using styrene and trifluoromethane sulfonic acid as the monomers and the commercial Nafion 117. The electrochemical results show that the micro semi-passive direct methanol fuel cells (μsp-DMFCs) assembled with the fabricated membrane can exhibit higher electrochemical performance than those with Nafion 117 and the membrane synthesized with only using styrene and trifluoromethane sulfonic acid as the monomers. The stability measurement also shows that the electrochemical performance of the μsp-DMFCs assembled with this membrane is more stable than that of the μsp-DMFCs with Nafion 117. These results clearly demonstrate the great potential of using such membranes as the PEMs to improve electrochemical performance of fuel cells.